10-Q

UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
WASHINGTON, D.C. 20549
	FORM10-Q

QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF

THE SECURITIES EXCHANGE ACT OF 1934

For the Quarterly Period Ended June 30, 2018

Commission File Number 1-9750

(Exact name of registrant as specified in its charter)
Delaware	38-2478409
(State or other jurisdiction of incorporation or organization)	(I.R.S. Employer Identification No.)
1334 York Avenue New York, New York	10021
(Address of principal executive offices)	(Zip Code)
Registrant's telephone number, including area code: (212) 606-7000

Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days.    Yes  ý    No  ¨

Indicate by check mark whether the registrant has submitted electronically and posted on its corporate Web site, if any, every Interactive Data File required to be submitted and posted pursuant to Rule 405 of the Regulation S-T (§232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit and post such files).    Yes  ý    No  ¨

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, a smaller reporting company, or an emerging growth company. See the definitions of "large accelerated filer," "accelerated filer," "smaller reporting company" and "emerging growth company" in Rule 12b-2 of the Exchange Act.

Large accelerated filer	ý		Accelerated filer	¨
Non-accelerated filer	¨	(Do not check if a smaller reporting company)	Smaller reporting company	¨
Emerging growth company	¨

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ¨

Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Act).    Yes  ¨    No  ý

As of August 1, 2018, there were 51,613,426 outstanding shares of common stock, par value $0.01 per share, of the registrant.

______________________________________________________________________________________________________

TABLE OF CONTENTS

		PAGE
PART I	FINANCIAL INFORMATION
Item 1	Financial Statements (UNAUDITED):
	Condensed Consolidated Income Statements for the Three and Six Months Ended June 30, 2018 and 2017	3
	Condensed Consolidated Statements of Comprehensive Income for the Three and Six Months Ended June 30, 2018 and 2017	4
	Condensed Consolidated Balance Sheets as of June 30, 2018, December 31, 2017 and June 30, 2017	5
	Condensed Consolidated Statements of Cash Flows for Six Months Ended June 30, 2018 and 2017	6
	Notes to Condensed Consolidated Financial Statements	7
Item 2	Management’s Discussion and Analysis of Financial Condition and Results of Operations	41
Item 3	Quantitative and Qualitative Disclosures About Market Risk	67
Item 4	Controls and Procedures	68
PART II	OTHER INFORMATION
Item 1	Legal Proceedings	68
Item 1A	Risk Factors	68
Item 2	Unregistered Sales of Equity Securities and Use of Proceeds	68
Item 4	Mine Safety Disclosures	69
Item 6	Exhibits	70
SIGNATURE		71

2

PART I: FINANCIAL INFORMATION

ITEM 1: FINANCIAL STATEMENTS

SOTHEBY’S

CONDENSED CONSOLIDATED INCOME STATEMENTS

(UNAUDITED)

(In thousands, except per share data)

	Three Months Ended						Six Months Ended
	June 30, 2018			June 30, 2017			June 30, 2018			June 30, 2017
Revenues:
Agency commissions and fees	$	290,879		$	301,768		$	456,405		$	413,033
Inventory sales	40,106			19,937			56,342			91,314
Finance	9,641			13,359			19,522			26,126
Other	5,010			4,795			9,163			8,695
Total revenues	345,636			339,859			541,432			539,168
Expenses:
Agency direct costs	59,449			54,842			94,722			76,131
Cost of inventory sales	42,414			22,255			58,409			93,662
Cost of finance revenues	1,793			5,078			4,056			10,115
Marketing	6,276			5,951			11,998			11,862
Salaries and related	96,718			88,540			175,437			154,090
General and administrative	45,671			43,362			89,484			82,313
Depreciation and amortization	7,343			5,676			14,443			11,060
Voluntary separation incentive programs, net	—			—			—			(162		)
Restructuring charges	2,146			—			2,146			—
Total expenses	261,810			225,704			450,695			439,071
Operating income	83,826			114,155			90,737			100,097
Interest income	482			367			847			624
Interest expense	(8,894		)	(7,572		)	(18,207		)	(15,105		)
Write-off of credit facility fees	(3,982		)	—			(3,982		)	—
Extinguishment of debt	—			—			(10,855		)	—
Non-operating income	2,449			944			3,873			2,988
Income before taxes	73,881			107,894			62,413			88,604
Income tax expense	17,838			31,468			13,702			24,176
Equity in earnings of investees	1,234			466			2,040			1,133
Net income	57,277			76,892			50,751			65,561
Less: Net (loss) income attributable to noncontrolling interest	(5		)	1			(9		)	(5		)
Net income attributable to Sotheby's	$	57,282		$	76,891		$	50,760		$	65,566
Basic earnings per share - Sotheby’s common shareholders	$	1.09		$	1.44		$	0.96		$	1.22
Diluted earnings per share - Sotheby's common shareholders	$	1.08		$	1.43		$	0.95		$	1.21
Weighted average basic shares outstanding	51,780			52,716			52,122			52,866
Weighted average diluted shares outstanding	52,210			53,054			52,491			53,342

See accompanying Notes to Condensed Consolidated Financial Statements

3

SOTHEBY’S

CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME

(UNAUDITED)

(Thousands of dollars)

	Three Months Ended						Six Months Ended
	June 30, 2018			June 30, 2017			June 30, 2018			June 30, 2017
Net income	$	57,277		$	76,892		$	50,751		$	65,561
Other comprehensive (loss) income:
Currency translation adjustments	(14,206		)	5,955			(7,006		)	8,351
Cash flow hedges	136			38			1,306			876
Net investment hedges	3,350			(1,454		)	1,740			(2,078		)
Defined benefit pension plan	81			215			163			423
Total other comprehensive (loss) income	(10,639		)	4,754			(3,797		)	7,572
Comprehensive income	46,638			81,646			46,954			73,133
Less: Comprehensive income (loss) attributable to noncontrolling interests	(5		)	1			(9		)	(5		)
Comprehensive income attributable to Sotheby's	$	46,643		$	81,645		$	46,963		$	73,138

See accompanying Notes to Condensed Consolidated Financial Statements

4

SOTHEBY’S CONDENSED CONSOLIDATED BALANCE SHEETS (UNAUDITED) (Thousands of dollars)
	June 30, 2018			December 31, 2017			June 30, 2017
A S S E T S
Current assets:
Cash and cash equivalents	$	432,357		$	544,432		$	516,402
Restricted cash (see Notes 8 and 11)	28,979			361,578			41,258
Accounts receivable, net of allowance for doubtful accounts of $9,667, $8,722, and $7,744	1,088,569			795,239			847,332
Notes receivable, net of allowance for credit losses of $1,132, $1,253, and $1,290	92,770			87,746			73,217
Inventory	32,639			74,483			131,193
Income tax receivables	18,051			6,601			14,825
Prepaid expenses and other current assets (see Note 11)	43,262			32,010			45,455
Total current assets	1,736,627			1,902,089			1,669,682
Notes receivable, net of allowance for credit losses of $1,525, $1,525, and $0	390,507			507,538			559,605
Fixed assets, net of accumulated depreciation and amortization of $239,705, $229,751, and $218,870	356,162			352,035			347,067
Goodwill	55,670			50,547			50,351
Intangible assets, net	14,613			11,492			12,407
Income tax receivables	327			324			434
Deferred income taxes	27,948			35,674			7,837
Other long-term assets (see Note 11)	229,813			227,608			192,995
Total assets	$	2,811,667		$	3,087,307		$	2,840,378
L I A B I L I T I E S  A N D  S H A R E H O L D E R S’  E Q U I T Y
Current liabilities:
Client payables	$	1,191,581		$	996,197		$	867,856
Accounts payable and accrued liabilities	104,608			90,298			91,196
Accrued salaries and related costs	62,160			94,310			54,733
Current portion of long-term debt, net	13,423			308,932			38,825
Accrued income taxes	23,012			8,127			21,180
Other current liabilities (see Note 10)	11,785			18,762			46,211
Total current liabilities	1,406,569			1,516,626			1,120,001
Credit facility borrowings	63,000			196,500			531,500
Long-term debt, net	648,411			653,003			563,762
Accrued income taxes	26,737			37,651			18,315
Deferred income taxes	14,035			15,163			11,800
Other long-term liabilities (see Note 11)	46,171			51,424			51,857
Total liabilities	2,204,923			2,470,367			2,297,235
Commitments and contingencies (see Note 15)
Shareholders’ equity:
Common stock, $0.01 par value	711			709			708
Authorized shares — 200,000,000
Issued shares —71,173,857; 70,830,184; and 70,817,787
Outstanding shares —51,613,065; 52,461,996; and 52,670,146
Additional paid-in capital	458,712			453,364			442,560
Treasury stock shares, at cost — 19,560,792; 18,368,188; and 18,147,641	(617,048		)	(554,551		)	(543,995		)
Retained earnings	830,459			779,699			726,469
Accumulated other comprehensive loss	(66,263		)	(62,466		)	(82,786		)
Total shareholders’ equity	606,571			616,755			542,956
Noncontrolling interest	173			185			187
Total equity	606,744			616,940			543,143
Total liabilities and shareholders’ equity	$	2,811,667		$	3,087,307		$	2,840,378

See accompanying Notes to Condensed Consolidated Financial Statements

5

SOTHEBY’S CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) (Thousands of dollars)
	Six Months Ended
	June 30, 2018			June 30, 2017
Operating Activities:
Net income attributable to Sotheby's	$	50,760		$	65,566
Adjustments to reconcile net income attributable to Sotheby's to net cash provided by operating activities:
Extinguishment of debt	10,855			—
Write-off of credit facility fees	3,982			—
Depreciation and amortization	14,443			11,060
Deferred income tax expense	2,873			11,551
Share-based payments	14,689			12,015
Net pension benefit	(1,626		)	(2,447		)
Inventory writedowns and bad debt provisions	8,106			7,470
Amortization of debt issuance costs	877			827
Equity in earnings of investees	(2,040		)	(1,133		)
Other	947			453
Changes in assets and liabilities:
Accounts receivable	(285,172		)	(359,192		)
Client payables	205,791			330,368
Inventory	33,680			21,026
Changes in other operating assets and liabilities (see Note 12)	(41,370		)	(43,307		)
Net cash provided by operating activities	16,795			54,257
Investing Activities:
Funding of notes receivable	(66,608		)	(101,896		)
Collections of notes receivable	161,192			124,879
Capital expenditures	(19,075		)	(8,420		)
Acquisitions, net of cash acquired	(5,702		)	—
Funding of investments	(64		)	(5,537		)
Distributions from investees	2,179			2,550
Proceeds from the sale of equity investment	—			2,110
Proceeds from company-owned life insurance	—			2,100
Settlement of net investment hedges	(5,921		)	29,110
Net cash provided by investing activities	66,001			44,896
Financing Activities:
Proceeds from credit facility borrowings	108,000			28,500
Repayments of credit facility borrowings	(241,500		)	(62,000		)
Repayments of York Property Mortgage	(3,978		)	(3,810		)
Settlement of 2022 Senior Notes, including call premium	(307,875		)	—
Debt issuance and other borrowing costs	(3,457		)	(23		)
Repurchases of common stock	(62,497		)	(33,940		)
Dividends paid	—			(2,375		)
Funding of employee tax obligations upon the vesting of share-based payments	(9,903		)	(14,573		)
Net cash used by financing activities	(521,210		)	(88,221		)
Effect of exchange rate changes on cash, cash equivalents, and restricted cash	(6,734		)	7,859
(Decrease) increase in cash, cash equivalents, and restricted cash	(445,148		)	18,791
Cash, cash equivalents, and restricted cash at beginning of period	923,926			556,201
Cash, cash equivalents, and restricted cash at end of period	$	478,778		$	574,992

Supplemental information on non-cash investing and financing activities:

See Note 5 for information regarding non-cash transfers between Accounts Receivable (net) and Notes Receivable (net).

See Note 9 for information regarding derivative financial instruments designated as net investment hedges.

See accompanying Notes to Condensed Consolidated Financial Statements

6

SOTHEBY’S

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

(UNAUDITED)

1. Basis of Presentation

Company Overview—Sotheby's (or the "Company") offers collectors the opportunity to connect with and transact in the world's most extraordinary art and luxury goods, which in this report may collectively be referred to as "art," "works of art," "artwork," or "property." Auctioneers since 1744, today we present auctions in ten different salesrooms, including New York, London, Hong Kong and Paris. We also offer collectors a variety of innovative art-related services, including the brokerage of private art sales, private jewelry sales through Sotheby's Diamonds, exclusive private selling exhibitions, art-related financing, and art advisory services, as well as retail wine locations in New York and Hong Kong.

Accounting Principles—The unaudited Condensed Consolidated Financial Statements included herein have been prepared by the management of Sotheby’s in accordance with accounting principles generally accepted in the United States of America ("U.S. GAAP") and pursuant to the rules and regulations of the Securities and Exchange Commission (the "SEC"). Certain information and footnote disclosures normally included in financial statements prepared in accordance with U.S. GAAP have been condensed or omitted from this report, as is permitted by such rules and regulations. In our opinion, the unaudited Condensed Consolidated Financial Statements reflect all adjustments of a normal recurring nature that are necessary for a fair presentation of the results for the interim periods presented. The interim results presented in our Condensed Consolidated Income Statements are not necessarily indicative of results for a full year. See Note 2 for information about the seasonality of our business. We urge you to read these unaudited Condensed Consolidated Financial Statements in conjunction with the information included in our 2017 Form 10-K filed with the SEC on March 1, 2018.

Principles of Consolidation—The unaudited Condensed Consolidated Financial Statements include the accounts of our wholly-owned subsidiaries and Sotheby's (Beijing) Auction Co., Ltd. ("Sotheby's Beijing"), a joint venture in which we have a controlling 80% ownership interest. The net loss attributable to the minority owner of Sotheby's Beijing is reported as "Net Loss (Income) Attributable to Noncontrolling Interest" in our Condensed Consolidated Income Statements, and the non-controlling 20% ownership interest is reported as "Noncontrolling Interest" within the Equity section of our Condensed Consolidated Balance Sheets. Intercompany transactions and balances among our subsidiaries are eliminated in consolidation.

Equity investments through which we may significantly influence, but not control, the investee, are accounted for using the equity method. Under the equity method, our share of investee earnings or losses is recorded in our Condensed Consolidated Income Statements within Equity in Earnings of Investees. Our interest in the net assets of these investees is recorded on our Condensed Consolidated Balance Sheets within Other Long-Term Assets. Our equity method investees include: (i) Acquavella Modern Art ("AMA"), a partnership through which a collection of fine art is being sold, (ii) RM Sotheby's, an auction house for investment-quality automobiles, and (iii) a partnership formed in the second quarter of 2017 through which artworks are being purchased and sold.

Estimates and Assumptions—The preparation of financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates.

7

Revenue Recognition—In May 2014, the Financial Accounting Standards Board (the "FASB") issued an Accounting Standards Update ("ASU") which amends revenue recognition guidance and requires more detailed disclosures to enable users of financial statements to understand the nature, amount, timing, and uncertainty of revenue and cash flows arising from contracts with customers. This ASU is codified in U.S. GAAP under Accounting Standards Codification ("ASC") 606, Revenue from Contracts with Customers.

We adopted ASC 606 on January 1, 2018 using the full retrospective method. The adoption of ASC 606 did not impact the timing of our revenue recognition, but it changed the presentation of certain revenues and expenses previously reported on a net basis in our Condensed Consolidated Income Statements. Specifically, the following items previously reported on a net basis within Agency Commissions and Fees are now reported on a gross basis within Agency Direct Costs: (i) fees owed to the counterparties in auction guarantee risk sharing arrangements and (ii) fees owed to third parties who introduce us to auction or private sale consignors. In addition, consignor expense recoveries and buyer shipping fees previously reported on a net basis within Agency Direct Costs are now reported on a gross basis within Agency Commission and Fees. The table below under "Summary of Adjustments to Prior Period Presentation" shows the impact of the retrospective adoption of ASC 606 on our Condensed Consolidated Income Statements for the three and six months ended June 30, 2017.

Statement of Cash Flows—In August 2016, the FASB issued ASU 2016-15, Statement of Cash Flows, which updated the guidance on how certain cash receipts and cash payments should be presented and classified within the statement of cash flows. We retrospectively adopted ASU 2016-15 on January 1, 2018. The adoption of ASU 2016-15 changed how we classify cash proceeds received from our investment in company-owned life insurance ("COLI"), which is held in a rabbi trust and used to fund certain deferred compensation liabilities. Prior to the adoption of ASU 2016-15, COLI proceeds were classified as cash inflows from operating activities, but are now classified as cash inflows from investing activities. The adoption of ASU 2016-15 also required us to make certain accounting policy elections with respect to the statement of cash flows. First, ASU 2016-15 clarifies that COLI premiums paid may be classified as cash outflows from operating or investing activities, or a combination of both. In connection with the adoption of ASU 2016-15, we made an accounting policy election to classify COLI premiums paid as cash outflows from operating activities, consistent with our previous presentation of such payments. Second, ASU 2016-15 allows distributions received from equity method investees to be classified using either the cumulative earnings approach or the nature of distribution approach. In connection with the adoption of ASU 2016-15, we made an accounting policy election to classify distributions received from equity method investees using the cumulative earnings approach, consistent with our previous presentation of such distributions. The other aspects of ASU 2016-15 did not result in a change to our existing accounting policies for the preparation of the statement of cash flows. The table below under "Summary of Adjustments to Prior Period Presentation" shows the impact of our retrospective adoption of ASU 2016-15 on our Condensed Consolidated Statements of Cash Flows for the six months ended June 30, 2017.

In November 2016, the FASB issued ASU 2016-18, Statement of Cash Flows, to add and clarify guidance on the classification and presentation of restricted cash and restricted cash equivalents in the statement of cash flows. In particular, ASU 2016-18 requires that restricted cash and restricted cash equivalents be included within cash and cash equivalents when reconciling the beginning-of-period and end-of-period totals disclosed in the statement of cash flows. Transfers between restricted and unrestricted cash accounts are not to be reported within the statement of cash flows. Only restricted cash receipts or payments directly with third parties are to be reported in the statement of cash flows as either an operating, investing, or financing activity, depending on the nature of the transaction. We retrospectively adopted ASU 2016-18 on January 1, 2018. The table below under "Summary of Adjustments to Prior Period Presentation" shows the impact of our retrospective adoption of ASU 2016-18 on our Condensed Consolidated Statements of Cash Flows for the six months ended June 30, 2017. (See Note 11 for information related to our restricted cash balances.)

Presentation of Pension and Postretirement Costs—In March 2017, the FASB issued ASU 2017-07, Improving the Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Cost, which requires that the service cost component of net periodic pension cost be presented in the same statement of operations line item as other employee compensation costs, while the remaining components of net periodic pension cost be presented outside of operating income (loss). We retrospectively adopted ASU 2017-07 on January 1, 2018. The table below under "Summary of Adjustments to Prior Period Presentation" shows the impact of our retrospective adoption of ASU 2017-07 on our Condensed Consolidated Income Statements for the three and six months ended June 30, 2017. (See Note 7 for information related to our defined benefit pension plan in the U.K.)

8

Summary of Adjustments to Prior Period Presentation—The following table summarizes the impact of the retrospective adoption of ASC 606 and ASU 2017-07 on our Condensed Consolidated Income Statements for the three and six months ended June 30, 2017 (in thousands of dollars):

Three months ended June 30, 2017	As Previously Reported			ASC 606 Adjustment		ASU 2017-07 Adjustment			As Adjusted
Revenues:
Agency commissions and fees	$	276,807		$	24,961	$	—		$	301,768
Total revenues	$	314,898		$	24,961	$	—		$	339,859
Expenses:
Agency direct costs	$	29,881		$	24,961	$	—		$	54,842
Salaries and related	$	87,297		$	—	$	1,243		$	88,540
Total expenses	$	199,500		$	24,961	$	1,243		$	225,704
Operating income	$	115,398		$	—	$	(1,243	)	$	114,155
Non-operating (expense) income	$	(299	)	$	—	$	1,243		$	944
Net income attributable to Sotheby's	$	76,891		$	—	$	—		$	76,891

Six months ended June 30, 2017	As Previously Reported		ASC 606 Adjustment		ASU 2017-07 Adjustment			As Adjusted
Revenues:
Agency commissions and fees	$	376,300	$	36,733	$	—		$	413,033
Total revenues	$	502,435	$	36,733	$	—		$	539,168
Expenses:
Agency direct costs	$	39,398	$	36,733	$	—		$	76,131
Salaries and related	$	151,643	$	—	$	2,447		$	154,090
Total expenses	$	399,891	$	36,733	$	2,447		$	439,071
Operating income	$	102,544	$	—	$	(2,447	)	$	100,097
Non-operating income	$	541	$	—	$	2,447		$	2,988
Net income attributable to Sotheby's	$	65,566	$	—	$	—		$	65,566

9

The following table summarizes the impact of the retrospective adoption of ASU 2016-15 and ASU 2016-18 on our Condensed Consolidated Statement of Cash Flows for the six months ended June 30, 2017 (in thousands of dollars):

	As Previously Reported			ASU 2016-15 Adjustments			ASU 2016-18 Adjustments			As Adjusted
Operating Activities:
Changes in other operating assets and liabilities	$	(41,207	)	$	(2,100	)	$	—		$	(43,307	)
Net cash provided by operating activities	$	56,357		$	(2,100	)	$	—		$	54,257
Investing Activities:
Proceeds from company-owned life insurance	$	—		$	2,100		$	—		$	2,100
Decrease in restricted cash	$	7,749		$	—		$	(7,749	)	$	—
Net cash provided by investing activities	$	50,545		$	2,100		$	(7,749	)	$	44,896
Financing Activities:
Increase in restricted cash related to York Property Mortgage	$	(2,799	)	$	—		$	2,799		$	—
Net cash used by financing activities	$	(91,020	)	$	—		$	2,799		$	(88,221	)
Effect of exchange rate changes on cash, cash equivalents, and restricted cash	$	4,489		$	—		$	3,370		$	7,859
Increase (decrease) in cash, cash equivalents, and restricted cash (a)	$	20,371		$	—		$	(1,580	)	$	18,791
Cash, cash equivalents, and restricted cash at beginning of period (a)	$	496,031		$	—		60,170			$	556,201
Cash, cash equivalents, and restricted cash at end of period (a)	$	516,402		$	—		$	58,590		$	574,992

(a) Restricted cash is included only in the adjusted balances, reflecting the retrospective adoption of ASU 2016-18.

2. Seasonality of Business

The global art auction market has two principal selling seasons, which generally occur in the second and fourth quarters of the year. In the aggregate, second and fourth quarter Net Auction Sales¹ represented 80% and 82% of our total annual Net Auction Sales in 2017 and 2016, respectively, with auction commission revenues comprising approximately 66% and 75%, of our total revenues, respectively. Accordingly, our financial results are seasonal, with peak revenues and operating income generally occurring in the second and fourth quarters. Consequently, first and third quarter results have historically reflected lower revenues when compared to the second and fourth quarters and, typically, a net loss due to the fixed nature of many of our operating expenses.

___________________________________________________________________

¹ Represents the total hammer (sale) price of property sold at auction.

10

3. Segment Reporting

Our operations are organized under two segments—the Agency segment and the Finance segment, which does business as and is referred to in this report as Sotheby's Financial Services (or "SFS"). Thomas S. Smith, Jr, Sotheby's CEO, is our chief operating decision maker. Mr. Smith regularly evaluates financial information about each of our segments in deciding how to allocate resources and assess performance. The performance of each segment is measured based on segment income before taxes, which excludes the unallocated items highlighted in the reconciliation below.

Through our Agency segment, we accept works of art on consignment and match sellers (also known as consignors) to buyers through the auction or private sale process. In both auction and private sale transactions, we act as exclusive agent for the seller. Prior to offering a work of art for sale, we perform due diligence activities to authenticate and determine the ownership history and condition of the consigned artwork. To a much lesser extent, Agency segment activities also include the sale of artworks that are principally acquired as a consequence of the auction process, and RM Sotheby's, an equity investee that operates as an auction house for investment-quality automobiles. The Agency segment is an aggregation of the auction, private sale, and other related activities that are conducted across various collecting categories, all of which have similar economic characteristics and are similar in their services, customers, and the manner in which their services are provided.

SFS is an art financing company that operates as a niche lender with the ability to tailor attractive financing packages for clients who wish to obtain immediate access to liquidity from their art assets. SFS leverages the art expertise of the Agency segment, skill in international law and finance, and access to capital to provide art collectors and dealers with financing secured by their works of art, allowing them to unlock the value in their collections.

Art Agency, Partners (“AAP”), through which we offer art advisory services, provides art collectors with strategic guidance on collection identity and development, acquisitions, short and long-term planning, and provides advice to artists and artists' estates. In addition, from time-to-time, AAP brokers private art sales for its advisory clients. Our advisory services are classified within All Other for segment reporting purposes, along with our retail wine business, brand licensing activities, and the results from certain equity method investments.

The following table presents our segment information for the three and six months ended June 30, 2018 and 2017 (in thousands of dollars):

Three Months Ended June 30, 2018	Agency		SFS		All Other		Reconciling items				Total
Revenues	$	327,445	$	11,823	$	8,550	$	(2,182	)	(a)	$	345,636
Segment income before taxes	$	67,173	$	6,891	$	1,051	$	(1,234	)	(b)	$	73,881
Three Months Ended June 30, 2017
Revenues (c)	$	319,474	$	16,362	$	7,026	$	(3,003	)	(a)	$	339,859
Segment income before taxes	$	97,226	$	8,879	$	2,255	$	(466	)	(b)	$	107,894
Six Months Ended June 30, 2018
Revenues	$	507,178	$	24,239	$	14,732	$	(4,717	)	(a)	$	541,432
Segment income before taxes	$	57,467	$	15,402	$	2,439	$	(12,895	)	(b)	$	62,413
Six Months Ended June 30, 2017
Revenues (c)	$	499,665	$	30,733	$	13,377	$	(4,607	)	(a)	$	539,168
Segment income before taxes	$	68,804	$	16,212	$	4,721	$	(1,133	)	(b)	$	88,604

(a) The reconciling items related to revenues consist principally of amounts charged by SFS to the Agency segment, including interest and facility fees related to certain loans made to Agency segment clients, as well as fees charged for term loan collateral sold at auction or privately through the Agency segment.

(b) The reconciling items related to segment income before taxes are detailed in the table below.

(c) Agency segment revenue for the three and six months ended June 30, 2017 has been recast to reflect the retrospective adoption of ASC 606. See Notes 1 and 4.

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The table below presents a reconciliation of total segment income before taxes to consolidated income before taxes for the three and six months ended June 30, 2018 and 2017 (in thousands of dollars):

	Three Months Ended June 30,						Six Months Ended June 30,
	2018			2017			2018			2017
Agency	$	67,173		$	97,226		$	57,467		$	68,804
SFS	6,891			8,879			15,402			16,212
All Other	1,051			2,255			2,439			4,721
Segment income before taxes	75,115			108,360			75,308			89,737
Unallocated amounts and reconciling items:
Extinguishment of debt	—			—			(10,855		)	—
Equity in earnings of investees (a)	(1,234		)	(466		)	(2,040		)	(1,133		)
Income before taxes	$	73,881		$	107,894		$	62,413		$	88,604

(a) For segment reporting purposes, our share of earnings related to equity investees is included as part of income before taxes. However, such earnings are reported separately below income before taxes in our Condensed Consolidated Income Statements.

The table below presents segment assets, as well as a reconciliation of segment assets to consolidated assets as of June 30, 2018, December 31, 2017, and June 30, 2017 (in thousands of dollars):

	June 30, 2018		December 31, 2017		June 30, 2017
Agency	$	2,227,296	$	2,395,429	$	2,130,731
SFS	494,420		608,713		663,500
All Other	43,625		40,566		48,051
Total segment assets	2,765,341		3,044,708		2,842,282
Unallocated amounts and reconciling items:
Deferred tax assets and income tax receivable	46,326		42,599		23,096
Reconciling item related to SFS (a)	—		—		(25,000		)
Consolidated assets	$	2,811,667	$	3,087,307	$	2,840,378

(a) As of June 30, 2017, segment assets for SFS included a $25 million consignor advance that is netted against an associated auction payable balance on our Condensed Consolidated Balance Sheets.

Substantially all of our capital expenditures for the six months endedJune 30, 2018, the year ended December 31, 2017, and the six months endedJune 30, 2017 were attributable to the Agency segment.

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4. Revenues

The Agency segment, which is our predominant source of revenue, earns commissions and fees by acting as agent for clients wishing to sell their artworks through the auction or private sale process. To a much lesser extent, the Agency segment also earns revenues from the sale of artworks that are owned by Sotheby's. Outside of the Agency segment, we earn revenues from art advisory services, retail wine sales, and brand licensing activities, which are aggregated and classified within All Other for segment reporting purposes, as well as from the art-related financing activities conducted by SFS. The revenues earned by the Agency and All Other segments are accounted for in accordance with ASC 606, Revenue from Contracts with Customers, which was retrospectively adopted on January 1, 2018. The revenues earned by SFS are not within the scope of ASC 606. (See Note 1 for information regarding the retrospective adoption of ASC 606.)

The following table summarizes our revenues by segment and type for the three and six months ended June 30, 2018 and 2017 (in thousands of dollars):

	Three Months Ended June 30, 2018								Three Months Ended June 30, 2017
	Agency		SFS		All Other		Total		Agency		SFS		All Other			Total
Revenue from contracts with customers:
Agency commissions and fees:
Auction commissions	$	257,799	$	—	$	—	$	257,799	$	266,949	$	—	$	—		$	266,949
Auction related fees, net (a)	6,081		—		—		6,081		16,045		—		—			16,045
Private sale commissions	24,016		—		500		24,516		14,827		—		—			14,827
Other Agency commissions and fees	2,359		—		124		2,483		3,947		—		—			3,947
Total Agency commissions and fees	290,255		—		624		290,879		301,768		—		—			301,768
Inventory sales	37,190		—		2,916		40,106		17,706		—		2,231			19,937
Advisory revenues	—		—		1,156		1,156		—		—		1,431			1,431
License fee and other revenues	—		—		3,854		3,854		—		—		3,364			3,364
Total revenue from contracts with customers	327,445		—		8,550		335,995		319,474		—		7,026			326,500
Finance revenue:
Interest and related fees	—		9,641		—		9,641		—		13,359		—		9,881	13,359
Total revenues	$	327,445	$	9,641	$	8,550	$	345,636	$	319,474	$	13,359	$	7,026		$	339,859

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	Six Months Ended June 30, 2018										Six Months Ended June 30, 2017
	Agency			SFS			All Other		Total		Agency			SFS			All Other		Total
Revenue from contracts with customers:
Agency commissions and fees:
Auction commissions	$	389,929	—	$	—	—	$	—	$	389,929	$	357,565	—	$	—	—	$	—	$	357,565
Auction related fees, net (a)	17,824		—	—		—	—		17,824		21,498		—	—		—	—		21,498
Private sale commissions	43,501		—	—		—	500		44,001		28,047		—	—		—	—		28,047
Other Agency commissions and fees	4,351		—	—		—	300		4,651		5,923		—	—		—	—		5,923
Total Agency commissions and fees	455,605			—			800		456,405		413,033			—			—		413,033
Inventory sales	51,573		—	—		—	4,769		56,342		86,632			—			4,682		91,314
Advisory revenues	—		—	—		—	2,406		2,406		—		—	—		—	2,829		2,829
License fee and other revenues	—		—	—		—	6,757		6,757		—		—	—		—	5,866		5,866
Total revenue from contracts with customers	507,178			—			14,732		521,910		499,665			—			13,377		513,042
Finance revenue:
Interest and related fees	—		—	19,522		—	—		19,522		—		—	26,126		—	—		26,126
Total revenues	$	507,178		$	19,522		$	14,732	$	541,432	$	499,665		$	26,126		$	13,377	$	539,168

(a) Auction Related Fees, net includes the net overage or shortfall attributable to auction guarantees, consignor expense recoveries, and shipping fees charged to buyers.

Auction Commissions—In our role as auctioneer, we accept works of art on consignment and match sellers (also known as consignors) to buyers through the auction process. In an auction transaction, we act as exclusive agent for the seller. The terms of our arrangement with the seller are stipulated in a consignment agreement, which, among other things, entitles us to collect and retain an auction commission as compensation for our service. Our auction commission includes a premium charged to the buyer and, to a lesser extent, a commission charged to the seller, both of which are calculated as a percentage of the hammer price of the property sold at auction. In certain situations, in order to secure a high-value consignment, we may not charge a seller's commission and/or may share a portion of our buyer's premium with the seller. In situations when we share a portion of our buyer's premium with the seller, our auction commission revenue is recorded net of the amount paid to the seller.

Prior to the date of the auction, we perform a number of activities in connection with our obligations under an auction consignment agreement, which may include: (i) transporting the consigned artwork to the location of the auction sale; (ii) performing due diligence to authenticate and determine the ownership history and condition of the consigned artwork; (iii) preparing the consigned artwork for auction (e.g., framing and cleaning); (iv) preparing catalogue content related to the consigned artwork (e.g., photography and description of the artwork); (v) marketing the artwork through exhibitions and advertising campaigns; (vi) establishing presale estimates for the consigned artwork in response to an assessment of buyer demand and overall market conditions; and (vii) conducting pre-auction bidder registration and qualification. The services associated with these activities are necessary components of our auction service, which culminates in the creation of a public marketplace for the sale and purchase of art that, if successful, results in the matching of the seller to a buyer upon the fall of the auctioneer's hammer.

Upon the fall of the auctioneer's hammer, the highest bidder becomes legally obligated to pay the aggregate purchase price (i.e., the hammer price plus buyer's premium) and the consignor is legally obligated to relinquish the property in exchange for the net sale proceeds (i.e., the hammer price less any seller's commission and expense recoveries). However, if the bidding for an individual artwork does not reach its reserve price (i.e., the confidential minimum hammer price at which the consignor has agreed to sell), the sale is not completed, and we are not entitled to collect a commission. Accordingly, the consignor receives the benefit of our auction service only when the sale is completed, upon the fall of the auctioneer's hammer, at which point in time we recognize our auction commission revenue.

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Under the standard terms and conditions of our auction sales, we are not obligated to pay the consignor for property that has not been paid for by the buyer. If a buyer defaults on payment, the sale is cancelled, and the property is returned to the consignor. We continually evaluate the collectability of amounts due from individual buyers and only recognize auction commission revenue when the collection of the amount due from the buyer is probable. If we determine that payment from the buyer is not probable, a cancelled sale is recorded in the period in which that determination is made and the associated Accounts Receivable balance, including our auction commission, is reversed. Our judgments regarding the collectability of Accounts Receivable are based on an assessment of the buyer's payment history, discussions with the buyer, and the value of any property held as security against the buyer's payment obligation. Our judgments with respect to the collectability of amounts due from buyers for auction purchases may prove, with the benefit of hindsight, to be incorrect. Historically, cancelled sales have not been material in relation to the aggregate hammer price of property sold at auction.

For artworks purchased at auction, the buyer is provided a five-year guarantee of authenticity. Subject to certain limitations, this guarantee generally attests to the authorship of the artwork. In the event a valid claim is made by the buyer under the authenticity guarantee, the sale is rescinded and we are obligated to refund the aggregate purchase price to the buyer. In these circumstances, the consignor is obligated to return any net sale proceeds paid to them. Outside of a valid authenticity claim, the buyer has no right to rescind an auction sale. The authenticity guarantee provided to the auction buyer is a product warranty that is associated with the provision of our auction service; it may not be purchased separately and does not provide an additional service to the buyer.

Auction Guarantee Overage (Shortfall)—From time-to-time, in the ordinary course of business, we will provide a guarantee to the consignor that their consigned artwork will achieve a specified minimum sale price at auction. This type of arrangement is known as an auction guarantee. If the property offered under an auction guarantee sells above the minimum guaranteed price, we are generally entitled to a share of the overage. In the event that the property sells for less than the minimum guaranteed price, we must perform under the auction guarantee by funding the shortfall between the sale price at auction and the amount of the auction guarantee. If the property offered under the auction guarantee does not sell, we must pay the amount of the auction guarantee to the consignor and then take ownership of the unsold property and may recover the amount paid through its future sale. In certain limited situations, if the guaranteed property fails to sell at auction or if the purchaser defaults, the consignor has the right to cancel the auction guarantee and retain the property. 

In situations when an item of guaranteed property does not sell and we take ownership of the property, it is taken into Inventory and recorded on our balance sheet at the lower of its cost (i.e., the amount paid under the auction guarantee) or our estimate of the property’s net realizable value (i.e., the expected sale price upon its eventual disposition).

We may reduce our financial exposure under auction guarantees through contractual risk sharing arrangements. Such auction guarantee risk sharing arrangements include irrevocable bid arrangements and, from time-to-time, partner sharing arrangements.

An irrevocable bid is an arrangement under which a counterparty irrevocably commits to bid a predetermined price on the guaranteed property. If the irrevocable bid is not the winning bid, the counterparty is generally entitled to receive, as their fee, a share of the buyer's premium earned on the sale and/or a share of any auction guarantee overage. Such fees paid to irrevocable bid counterparties are recorded within Agency Direct Costs in the period of the sale. If the irrevocable bid is the winning bid, the counterparty may sometimes receive a fee as compensation for providing the irrevocable bid. This fee is netted against the counterparty's obligation to pay the full purchase price (i.e., the hammer price plus buyer's premium) and is recorded as a reduction to our auction commission revenue in the period of the sale.

In a partner sharing arrangement, a counterparty commits to fund: (i) a share of the difference between the sale price at auction and the amount of the auction guarantee, if the property sells for less than the minimum guaranteed price, or (ii) a share of the minimum guaranteed price if the property does not sell, while taking ownership of a proportionate share of the unsold property. In exchange for accepting a share of the financial exposure under the auction guarantee, if the property sells, the counterparty in a partner sharing arrangement is generally entitled to receive, as their fee, a share of the buyer's premium earned on the sale and/or a share of any auction guarantee overage. Such fees paid to the counterparties in auction guarantee partner sharing arrangements are recorded within Agency Direct Costs in the period of the sale.

Similar to a standard auction transaction, for property sold under an auction guarantee, the consignor receives the benefit of our auction service only when the sale is completed, upon the fall of the auctioneer's hammer, at which point in time we recognize our auction commission revenue and any auction guarantee overage or shortfall. In the event that the property offered under an auction guarantee sells for a hammer price that is less than the minimum guaranteed price, the amount of the shortfall is recorded net of any buyer’s premium commission earned on the sale. An auction guarantee shortfall may also be recognized prior to the date of the auction if we determine that it is probable that the expected selling price of the property, including buyer's premium, will not exceed the amount of the auction guarantee.

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Consignor Expense Recoveries—We incur various direct costs in the fulfillment of our auction service. These costs principally relate to the transport of consigned artworks to the location of the auction sale, various sale marketing activities including catalogue production and distribution, and the exhibition of consigned artworks. Auction consignment agreements sometimes permit us to recover all or a portion of these costs from the consignor through a deduction from their net sale proceeds if the item is sold at auction. Such recoveries are recognized as revenue in the period of the auction sale.

Buyer Shipping Fees—Auction buyers may be charged a fee for shipping services associated with their purchased property. Such fees are recognized as revenue in the period when the shipping service is provided.

Private Sale Commissions—Private sale commission revenues are earned through the direct brokering of purchases and sales of art. Private sales are generally initiated by a client wishing to sell their artwork (i.e., the consignor) with Sotheby's acting as their exclusive agent in the transaction. Such arrangements are evidenced by a legally binding consignment agreement between us and the seller, which outlines the terms of the arrangement, including the desired sale price and the amount or rate of commission that we may earn if a sale is completed, as well as, in certain instances, the period of time over which the artwork may be offered for private sale. The terms of the private sale consignment agreement create our sole performance obligation, which is to broker a legally binding sale of the consigned artwork to a qualified buyer as exclusive agent for the seller.

In connection with our efforts to fulfill our performance obligation under a private sale consignment agreement, we perform a number of activities, which may include: (i) transporting the consigned artwork to the location of the sale; (ii) performing due diligence to authenticate and determine the ownership history and condition of the consigned artwork; (iii) preparing the consigned artwork for sale (e.g., framing and cleaning); (iv) providing advice as to an appropriate asking price for the consigned artwork in response to an assessment of buyer demand and overall market conditions; (v) marketing the artwork to a select group of potential buyers or through theme-based private sale exhibitions; and (vi) completing all relevant administrative tasks related to completion of the sale.

In certain situations, when completing a private sale, we may execute a legally binding agreement with the buyer stipulating the terms pursuant to which the buyer will purchase the consigned artwork. In situations when a legally binding buyer agreement is not executed, only an invoice is issued to provide the buyer with the information necessary for finalizing the transaction (e.g., the amount owed and any associated taxes and royalties, the payment due date, payment instructions, etc.).

The consignor receives the benefit of our private sale service only upon the completion of a legally binding sale. For private sales where we execute a buyer agreement, the consignor receives the benefit of our private sale service and revenue is recognized at the point in time when the agreement is signed by the buyer. At this point in time, the buyer becomes legally obligated to pay the purchase price and the consignor is legally obligated to relinquish the property in exchange for the net sale proceeds (i.e., the purchase price less our commission). In the absence of an executed buyer agreement, the consignor receives the benefit of our private sale service and revenue is recognized at the point in time when the full purchase price is paid by the buyer. At this point in time, we have performed all of our service obligations in the transaction and the consignor is legally obligated to relinquish the property in exchange for the net sale proceeds. If we are not successful in completing a sale according to the terms of the private sale consignment agreement, we are not entitled to collect a commission.

For artworks purchased in a private sale transaction, the buyer is provided a guarantee of authenticity for a period of up to five years. Subject to certain limitations, this guarantee generally attests to the authorship of the artwork. In the event a valid claim is made by the buyer under the authenticity guarantee, the sale is rescinded and we are obligated to refund the purchase price to the buyer. In these circumstances, the consignor is obligated to return any net sale proceeds paid to them. Outside of a valid authenticity claim, the buyer has no right to rescind a completed private sale. The authenticity guarantee provided to the buyer is a product warranty that is associated with the provision of our private sale service; it may not be purchased separately and does not provide an additional service to the buyer.

Other Agency Commissions and Fees—From time-to-time, we earn commissions and fees connected with sales of art brokered by third parties. These commissions and fees are recognized at a point in time in the period when we receive confirmation from the third parties that the sale has been completed.

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Inventory Sales—From time-to-time, the Agency segment earns revenue from the sale of: (i) artworks that have been obtained as a result of the failure of guaranteed property to sell at auction; (ii) artworks that have been purchased opportunistically, including property acquired for sale at auction; and (iii) other objects obtained incidental to the auction process (e.g., as a result of buyer default).

Inventory sales may be consummated through either a private sale transaction or through an auction sale. For artworks that are sold privately, an executed agreement with the buyer is used to document the terms and conditions of the transaction. For artworks that are sold at auction, the sale is completed pursuant to the conditions of sale published in the corresponding auction catalogue. Regardless of the method of sale, title and control of the artwork are transferred to the buyer only upon payment of the full purchase price. Accordingly, sales of inventory are recognized at a point in time in the period when title and control of the artwork is transferred to the buyer.

Advisory Revenues—Advisory revenues consist of fees earned from providing art-related advice to certain clients. These arrangements may be evidenced by a legally binding written retainer agreement with the client, which outlines the nature of the services to be provided and the amount of fees to be earned. Advisory retainer agreements are typically one year in duration. Advisory services are also sometimes provided on the basis of a verbal agreement with the client. For advisory arrangements with written retainer agreements, revenues are recognized ratably over time, based on the contractual period and as services are provided to the client. In the absence of a written retainer agreement, revenue recognition is deferred until we have performed our substantive service obligations and the client has made payment for those services, thereby evidencing the terms of the arrangement.

License Fee Revenues—Prior to 2004, we were engaged in the marketing and brokerage of luxury residential real estate sales through Sotheby's International Realty ("SIR"). In 2004, we sold SIR to a subsidiary of Realogy Corporation ("Realogy"), formerly Cendant Corporation. In conjunction with the sale, we entered into an agreement with Realogy to license the SIR trademark and certain related trademarks for an initial 50-year term with a 50-year renewal option (the "Realogy License Agreement"). The Realogy License Agreement is applicable worldwide.The Realogy License Agreement provides for an ongoing license fee during its term based on the volume of commerce transacted under the licensed trademarks. We also license the Sotheby's name for use in connection with the art auction business in Australia, and art education services in the U.S. and the U.K. The license fees earned from these arrangements are sales-based and are recognized in the periods in which the underlying sales occur.

Sales, Use and Value-Added Taxes—Sales, use and value-added taxes assessed by governmental authorities that are both imposed on and concurrent with revenue-producing transactions between us and our clients are reported on a net basis within revenues.

Resale Royalties—In certain foreign jurisdictions, various resale royalties and other fees are imposed on auctioneers upon the completion of an auction sale. These royalties and fees are reported on a gross basis within Agency Direct Costs.

Contract Balances—Following the completion of an auction or private sale, we invoice the buyer for the aggregate purchase price of the property, which includes our buyer's premium or private sale commission, as well as any applicable taxes and royalties. The amount owed by the buyer is recorded within Accounts Receivable, and the amount of net sale proceeds due to the seller is recorded within Client Payables. Upon collection from the buyer, we are obligated to remit the net proceeds to the seller after deducting our commissions and related fees, as well as any applicable taxes and royalties, which are ultimately paid to the appropriate taxing authority or royalty association.

Under our standard auction payment terms, the purchase price is due from the buyer no more than 30 days after the sale date, with the net proceeds due to the consignor 35 days after the sale date. For private sales, payment from the buyer is typically due on the sale date, with the net sale proceeds due to the consignor shortly thereafter. We also sometimes provide extended payment terms to an auction or private sale buyer. For auctions, the extent to which extended payment terms are provided can vary considerably from selling season to selling season. Extended payment terms typically extend the payment due date to a date that is no longer than one year from the sale date. In limited circumstances, the payment due date may be extended to a date that is beyond one year from the sale date. When providing extended payment terms, we attempt to match the timing of cash receipt from the buyer with the timing of our payment to the consignor, but are not always successful in doing so. All extended payment term arrangements are approved by management under our internal corporate governance policy.

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In the limited circumstances when the buyer's payment due date is extended to a date that is beyond one year from the sale date, if the seller does not provide matched payment terms (i.e., we pay the seller before receiving payment from the buyer), the receivable balance is reclassified from Accounts Receivable to Notes Receivable on our Condensed Consolidated Balance Sheets. See Note 5 for information on Agency segment Notes Receivable.

When the buyer's due date is extended to a date that is one year or less from the sale date, as a practical expedient, we do not record a discount to our commission to account for the effects of the financing component. However, in the limited circumstances when the buyer's due date is extended to a date that is beyond one year from the sale date, we record a discount to our commission revenue to reflect the financing component, if material.

The table below summarizes the balances related to our contracts with customers as of and for the six months ended June 30, 2018 and 2017 (in thousands of dollars):

	June 30, 2018		June 30, 2017
Accounts Receivable
Balance as of beginning of period	$	783,706	$	424,418
Balance as of end of period	$	1,076,152	$	837,200
Increase/(decrease)	$	292,446	$	412,782
Client Payables
Balance as of beginning of period	$	996,197	$	511,876
Balance as of end of period	$	1,191,581	$	867,856
Increase/(decrease)	$	195,384	$	355,980

The balances of Accounts Receivable presented in the table above relate almost entirely to amounts due from auction and private sale buyers. To a much lesser extent, they also include amounts owed to us in relation to our advisory services and brand licensing activities. Interest and related fees due to SFS, which are recorded within Accounts Receivable on our Condensed Consolidated Balance Sheets, are excluded from this table because they are not considered to be contract balances under ASC 606.

The net increases in Accounts Receivable and Client Payables for the periods ending June 30, 2018 and 2017 are largely the result of auction sales occurring in the second quarter for which the sale proceeds were not yet collected from buyers and remitted to sellers as of the balance sheet date. When compared to June 30, 2017, the increases in Accounts Receivable and Client Payables are principally due to the higher levels of auction and private sales through the second quarter of 2018, a decrease in early consignor settlements (as discussed in the following paragraph), and the general timing of buyer and consignor settlements.

In certain instances, and subject to management approval under our internal corporate governance policy, we may pay the net sale proceeds to the seller before payment is collected from the buyer and/or we may allow the buyer to take possession of the property before making payment. In situations when the buyer takes possession of the property before making payment, we are liable to the seller for the net sales proceeds whether or not the buyer makes payment. As of June 30, 2018, December 31, 2017, and June 30, 2017, Accounts Receivable included $75.3 million, $92.1 million, and $85.3 million, respectively, related to situations when we paid the seller all or a portion of the net sales proceeds before payment was collected from the buyer. As of June 30, 2018, December 31, 2017, and June 30, 2017, Accounts Receivable (net) also included $26.9 million, $53.8 million, and $33.4 million, respectively, related to situations when we allowed the buyer to take possession of the property before making payment.

Deferred revenue balances are generally not material. However, as of June 30, 2017, our Condensed Consolidated Balance Sheets include a significant deferred revenue balance related to the sale of an item of Inventory. (See Note 10.)

Contract Costs—We incur various direct costs in the fulfillment of our auction services. These costs principally relate to the transport of consigned artworks to the location of the auction sale, various sale marketing activities including catalogue production and distribution, and the exhibition of consigned artworks. A large portion of these costs are funded prior to the auction and are recorded on our Condensed Consolidated Balance Sheets within Prepaid Expenses and Other Current Assets until the date of the auction sale when they are expensed to Direct Costs of Services in the Condensed Consolidated Income Statements. As of June 30, 2018, December 31, 2017, and June 30, 2017, the contract cost balances recorded within Prepaid Expenses and Other Current Assets were $6.8 million, $9.6 million, and $7.5 million, respectively.

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5. Notes Receivable

Sotheby's Financial Services—SFS makes term loans secured by artworks that are not presently intended for sale, allowing us to establish or enhance mutually beneficial relationships with art collectors. Term loans may also generate future auction or private sale consignments through the sale of the collateral at the conclusion of the loan and/or through future purchases of new property by the borrower. In certain situations, term loans are made to refinance the accounts receivable balances generated by the auction and private sale purchases of our clients. Term loans normally have initial maturities of up to two years and typically carry a variable market rate of interest. To a much lesser extent, SFS also makes consignor advances secured by artworks that are contractually committed, in the near term, to be offered for sale through the Agency segment. Consignor advances allow sellers to receive funds upon consignment for an auction or private sale that will occur up to one year in the future and normally have short-term maturities.

As of June 30, 2018, December 31, 2017, and June 30, 2017, the net Notes Receivable balance of SFS was $480 million, $590.6 million, and $651.4 million, respectively. As of June 30, 2018, December 31, 2017, and June 30, 2017, the total net Notes Receivable balance of SFS included $28.4 million, $54.4 million, and $85.6 million, respectively, of term loans issued by SFS to refinance client auction and private sale purchases. For the six months ended June 30, 2018 and 2017, SFS issued $15.1 million and $3.8 million, respectively, of such loans. These loans are accounted for as non-cash transfers between Accounts Receivable (net) and Notes Receivable (net) and are, therefore, not reflected as the funding of Notes Receivable within Investing Activities in our Condensed Consolidated Statements of Cash Flows. Upon repayment, the cash received in settlement of such Notes Receivable is classified within Operating Activities in our Condensed Consolidated Statements of Cash Flows. For the six months ended June 30, 2018 and 2017, such repayments totaled $41.1 million and $6.9 million, respectively.

The repayment of secured loans can be adversely impacted by a decline in the art market in general or in the value of the collateral, which is concentrated within certain collecting categories. In addition, in situations when there are competing claims on the collateral and/or when a borrower becomes subject to bankruptcy or insolvency laws, our ability to realize on our collateral may be limited or delayed.

We aim to mitigate the risk associated with a potential devaluation in our collateral by targeting a 50% loan-to-value ("LTV") ratio (i.e., the principal loan amount divided by the low auction estimate of the collateral). However, loans may also be made with LTV ratios between 51% and 60%, and, in rare circumstances, loans may be made at an initial LTV ratio higher than 60%. 

The LTV ratio of certain loans may increase above the 50% target due to a decrease in the low auction estimates of the collateral. The revaluation of term loan collateral is performed by our specialists on an annual basis or more frequently if there is a material change in the circumstances related to the loan, the value of the collateral, the disposal plans for the collateral, or if an event of default occurs. We believe that the LTV ratio is a critical credit quality indicator for the secured loans made by SFS.

The table below provides the aggregate LTV ratio for the SFS loan portfolio as of June 30, 2018, December 31, 2017, and June 30, 2017 (in thousands of dollars):

	June 30, 2018			December 31, 2017			June 30, 2017
Secured loans	$	479,972		$	590,609		$	651,361
Low auction estimate of collateral	$	1,159,693		$	1,369,235		$	1,445,847
Aggregate LTV ratio	41		%	43		%	45		%

The table below provides the aggregate LTV ratio for secured loans made by SFS with an LTV ratio above 50% as of June 30, 2018, December 31, 2017, and June 30, 2017 (in thousands of dollars):

	June 30, 2018			December 31, 2017			June 30, 2017
Secured loans with an LTV ratio above 50%	$	105,744		$	168,116		$	209,483
Low auction estimate of collateral related to secured loans with an LTV ratio above 50%	$	182,398		$	269,063		$	375,933
Aggregate LTV ratio of secured loans with an LTV ratio above 50%	58		%	62		%	56		%

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The table below provides other credit quality information regarding secured loans made by SFS as of June 30, 2018, December 31, 2017, and June 30, 2017 (in thousands of dollars):

	June 30, 2018		December 31, 2017		June 30, 2017
Total secured loans	$	479,972	$	590,609	$	651,361
Loans past due	$	62,310	$	62,570	$	108,560
Loans more than 90 days past due	$	41,819	$	56,087	$	41,448
Non-accrual loans	$	15,402	$	—	$	—
Impaired loans	$	—	$	—	$	—
Allowance for credit losses:
Allowance for credit losses for impaired loans	$	—	$	—	$	—
Allowance for credit losses based on historical data	1,132		1,253		1,290
Total allowance for credit losses - secured loans	$	1,132	$	1,253	$	1,290

We consider a loan to be past due when principal payments are not paid by the contractual maturity date. Typically, a loan becomes past due only for a short period of time during which either the loan is renewed or collateral is sold to satisfy the borrower's obligations. As of June 30, 2018, $62.3 million of the net Notes Receivable balance was past due, of which $41.8 million was more than 90 days past due. We are continuing to accrue interest on $46.9 million of past due loans and, as of June 30, 2018, the collateral securing such loans had a low auction estimate of approximately $190.8 million, resulting in an LTV ratio of approximately 25%. In consideration of expected loan renewals, collateral sales to date for which the proceeds have not yet been collected from the buyer, as well as the value of the remaining collateral and our current collateral disposal plans, we believe that the principal and interest amounts owed for these past due loans will be collected.

A non-accrual loan is a loan for which future Finance revenue is not recorded due to our determination that it is probable that future interest on the loan is not collectible. Any cash receipts subsequently received on non-accrual loans are first applied to reduce the recorded principal balance of the loan, with any proceeds in excess of the principal balance then applied to interest owed by the borrower. The recognition of Finance revenue may resume on a non-accrual loan if sufficient additional collateral is provided by the borrower or if we become aware of other circumstances that indicate that it is probable that the borrower will make future interest payments on the loan. As of January 1, 2018, one of the past due loans included in the table above was placed on non-accrual status. During the first and second quarters of 2018, our investment in this loan was reduced by $32 million as the result of proceeds collected from collateral sales. As of June 30, 2018, our recorded investment in this loan was approximately $17.2 million, consisting of the $15.4 million principal balance and $1.8 million in accrued interest. Additional collateral sale proceeds of $14.1 million are expected to be collected from auction buyers later in 2018. Following the collection of these collateral sale proceeds, our recorded investment in the loan will be approximately $3.1 million. We expect to recover our investment in this loan through the future sale of the remaining loan collateral, which is expected to be offered at auction and through private sales during the remainder of 2018.

A loan is considered to be impaired when we determine that it is probable that a portion of the principal and interest owed by the borrower will not be recovered after taking into account the estimated realizable value of the collateral securing the loan, as well as the ability of the borrower to repay any shortfall between the value of the collateral and the amount of the loan. If a loan is considered to be impaired, Finance revenue is no longer recognized and bad debt expense is recorded for any principal or accrued interest that is deemed uncollectible. As of June 30, 2018, December 31, 2017, and June 30, 2017, there were no impaired loans outstanding.

As of June 30, 2018, unfunded commitments to extend additional credit through SFS were approximately $50.2 million.

Agency Segment—As discussed above, in the limited circumstances when the payment due date for an auction or private sale receivable is extended to a date that is beyond one year from the sale date, if the consignor does not provide matched payment terms, the receivable balance is reclassified from Accounts Receivable (net) to Notes Receivable (net) on our Condensed Consolidated Balance Sheets. As of June 30, 2018, December 31, 2017, and June 30, 2017, Notes Receivable (net) within the Agency segment included $1.2 million, $2.7 million, and $2.6 million of such amounts reclassified from Accounts Receivable (net). These Notes Receivable are accounted for as non-cash transfers between Accounts Receivable (net) and Notes Receivable (net) and are, therefore, not reflected as the funding of Notes Receivable within Investing Activities in our Condensed Consolidated Statements of Cash Flows. Upon repayment, the cash received in settlement of such Notes Receivable is classified within Operating Activities in our Condensed Consolidated Statements of Cash Flows. For the six months ended June 30, 2018 and 2017, such repayments totaled $1 million and $5 million, respectively.

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Under certain circumstances, we provide loans to certain art dealers to finance the purchase of works of art. In these situations, we acquire a partial ownership interest or a security interest in the purchased property in addition to providing the loan. Upon the eventual sale of the property acquired, the loan is repaid. As of June 30, 2017, such loans totaled $3.8 million. In the fourth quarter of 2017, we determined one of these loans to be impaired as a result of the bankruptcy of the art dealer and recorded a credit loss of $1.5 million in the period. We have commenced legal proceedings against one of the individuals who personally guaranteed this loan. As of June 30, 2018 and December 31, 2017, we had one loan outstanding of this type with a balance of $2.1 million. We are no longer accruing interest on this loan, but we believe that the recorded balance of this loan is collectible.

Allowance for Credit Losses—During the period January 1, 2018 to June 30, 2018, activity related to the Allowance for Credit Losses by segment was as follows (in thousands of dollars):

	SFS			Agency		Total
Balance as of January 1, 2018	$	1,253		$	1,525	$	2,778
Change in loan loss provision based on historical data	(121		)	—		(121		)
Balance as of June 30, 2018	$	1,132		$	1,525	$	2,657

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6. Goodwill and Intangible Assets

Goodwill—For the six months ended June 30, 2018 and 2017, changes in the carrying value of Goodwill were as follows (in thousands of dollars):

	Six Months Ended June 30, 2018								Six Months Ended June 30, 2017
	Agency			All Other		Total			Agency		All Other		Total
Beginning balance as of January 1	$	44,396		$	6,151	$	50,547		$	43,878	$	6,151	$	50,029
Goodwill acquired	5,259			—		5,259			—		—		—
Foreign currency exchange rate changes	(136		)	—		(136		)	322		—		322
Ending balance as of June 30	$	49,519		$	6,151	$	55,670		$	44,200	$	6,151	$	50,351

On February 2, 2018, we acquired Viyet, an online marketplace for interior design specializing in vintage and antique furniture, decorative objects, and accessories. This acquisition complements and enhances our online sales program, and provides an additional sale format to offer clients.

Intangible Assets—As of June 30, 2018, December 31, 2017, and June 30, 2017, intangible assets consisted of the following (in thousands of dollars):

	Amortization Period	June 30, 2018			December 31, 2017			June 30, 2017
Indefinite lived intangible assets:
License (a)	N/A	$	324		$	324		$	324
Intangible assets subject to amortization:
Customer relationships - Art Advisory Partners	8 years	10,800			10,800			10,800
Non-compete agreements - Art Advisory Partners	6 years	3,060			3,060			3,060
Artworks database (b)	10 years	1,200			1,200			1,125
Technology	4 years	4,461			—			—
Total intangible assets subject to amortization		19,521			15,060			14,985
Accumulated amortization		(5,232		)	(3,892		)	(2,902		)
Total amortizable intangible assets (net)		14,289			11,168			12,083
Total intangible assets (net)		$	14,613		$	11,492		$	12,407

(a) Relates to a license obtained in conjunction with the purchase of a retail wine business in 2008.

(b) Relates to a database containing historic information concerning repeat sales of works of art. This database was acquired along with the associated business in exchange for an initial cash payment made in the third quarter of 2016 and a subsequent cash payment made in the third quarter of 2017.

For the three and six months ended June 30, 2018, amortization expense related to intangible assets was approximately $0.7 million and $1.3 million, respectively. For the three and six months ended June 30, 2017, amortization expense related to intangible assets was approximately $0.5 million and $1 million, respectively.

The estimated aggregate amortization expense for the remaining useful lives of intangible assets subject to amortization during the five-year period succeeding the June 30, 2018 balance sheet date are as follows (in thousands of dollars):

Period	Amount
July 2018 to June 2019	$	3,095
July 2019 to June 2020	$	3,095
July 2020 to June 2021	$	3,095
July 2021 to June 2022	$	2,376
July 2022 to June 2023	$	1,470

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7. Defined Benefit Pension Plan

We sponsor a defined benefit pension plan in the U.K. (the "U.K. Pension Plan"), which was closed to future service cost accruals on April 30, 2016. For the three and six months ended June 30, 2018 and 2017, the components of the net pension credit for the U.K. Pension Plan recorded within Non-Operating Income in our Condensed Consolidated Income Statements were as follows (in thousands of dollars):

	Three Months Ended June 30,						Six Months Ended June 30,
	2018			2017			2018			2017
Interest cost	$	1,939		$	1,999		3,920			3,937
Expected return on plan assets	(2,839		)	(3,514		)	(5,741		)	(6,921		)
Prior service cost	—			15			—			30
Amortization of actuarial loss	122			280			247			553
Amortization of prior service cost	(26		)	(23		)	(52		)	(46		)
Net pension credit	$	(804	)	$	(1,243	)	$	(1,626	)	$	(2,447	)

8. Debt

Revolving Credit Facilities—Prior to June 26, 2018, we were party to credit agreements with an international syndicate of lenders that, among other things, provided for dedicated asset-based revolving credit facilities for the Agency segment (the "Agency Credit Facility") and SFS (the "SFS Credit Facility") (collectively, the "Previous Credit Agreements"). The Previous Credit Agreements were scheduled to mature on August 22, 2020.

On June 26, 2018, we refinanced the Previous Credit Agreements and entered into a new credit agreement with an international syndicate of lenders led by JPMorgan Chase Bank, N.A. (the “New Credit Agreement”). The proceeds under the New Credit Agreement may be used for our working capital and other general corporate purposes and borrowings thereunder are available in U.S. Dollars, Pounds Sterling, Euros, Swiss Francs or Hong Kong Dollars. The New Credit Agreement reduces the interest rate margins for borrowings when compared to those under the Previous Credit Agreements by 25 basis points. Such interest rate margins are determined by reference to a pricing grid that is based on the level of borrowings outstanding under the New Credit Agreement. The New Credit Agreement is scheduled to mature on June 26, 2023.

The New Credit Agreement combines the previous Agency Credit Facility and previous SFS Credit Facility into one asset-based revolving credit facility with an aggregate borrowing capacity of $1.1 billion, which is subject to an enhanced borrowing base. The New Credit Agreement has a sub-limit of $350 million for foreign currency borrowings, as well as an accordion feature, which allows us to seek an increase to the borrowing capacity of the New Credit Agreement by an amount not to exceed $300 million in the aggregate. Though new commitments would need to be obtained, the uncommitted accordion feature permits us to seek an increase to the aggregate borrowing capacity under the New Credit Agreement pursuant to an expedited documentation process.

The borrowing base under the New Credit Agreement is determined by a calculation that is based upon, among other things, a percentage of: (i) eligible cash; (ii) the value of certain auction guarantee advances; (iii) the value of certain art inventory; (iv) the value of certain extended payment term receivables arising from auction or private sale transactions; (v) the value of certain loans in the SFS loan portfolio; (vi) the fair market value of certain eligible real property located in the U.K.; and (vii) the net orderly liquidation value of certain of our trademarks.

Domestic borrowers are jointly and severally liable for all obligations under the New Credit Agreement and, subject to certain limitations, borrowers in the U.K. and Sotheby's Hong Kong Limited, are jointly and severally liable for all obligations of the foreign borrowers under the New Credit Agreement. In addition, the obligations of the borrowers under the New Credit Agreement are guaranteed by certain of their subsidiaries. Our obligations under the New Credit Agreement are secured by liens on all or substantially all of the personal property of the entities that are borrowers and guarantors under the New Credit Agreement.

The New Credit Agreement contains certain customary affirmative and negative covenants including, but not limited to, limitations on indebtedness, liens, investments, restricted payments, and the use of proceeds from borrowings under the Credit Agreement. The New Credit Agreement also contains a limitation on net outstanding auction guarantees (i.e., auction guarantees less the impact of related risk sharing arrangements).

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The New Credit Agreement permits dividend payments, common stock repurchases, investments and certain debt prepayments, so long as no event of default exists and subject to maintaining a minimum level of borrowing availability. The New Credit Agreement also contains certain financial covenants, which are only applicable during certain defined compliance periods. These financial covenants were not applicable for the twelve month period ended June 30, 2018.

We incurred aggregate fees of approximately $4 million in fees related to the New Credit Agreement, which are being amortized on a straight-line basis through its June 26, 2023 maturity date. As a result of this refinancing, $4 millionof unamortized fees related to the Previous Credit Agreements were written off in the second quarter of 2018.

The following tables summarize information related to our credit facilities as of and for the periods ended June 30, 2018, December 31, 2017, and June 30, 2017 (in thousands of dollars):

As of and for the periods ended	June 30, 2018		December 31, 2017		June 30, 2017
Maximum borrowing capacity (a)	$	1,100,000	$	1,100,000	$	1,335,000
Borrowing base	$	655,198	$	605,927	$	692,205
Borrowings outstanding (b)	$	63,000	$	196,500	$	531,500
Available borrowing capacity (c)	$	592,198	$	409,427	$	160,705
Average Borrowings Outstanding:
Three months ended June 30,	$	63,637	N/A		$	541,874
Six months ended June 30,	$	105,823	N/A		$	552,130
Year ended December 31,	N/A		$	479,367	N/A

(a) On October 2, 2017, we reduced the borrowing capacity of the previous SFS Credit Facility by $235 million. This reduction, which was entirely at our option and as part of our ongoing capital allocation analysis, was executed in order to reduce facility fees for unused borrowing capacity.

(b) The $63 million in borrowings outstanding under the New Credit Agreement as of June 30, 2018 were repaid in July 2018.

(c) The available borrowing capacity is calculated as the borrowing base less borrowings outstanding.

Borrowing costs under the Previous Credit Agreements related to the Agency segment, which include interest and fees, are reflected in our Condensed Consolidated Income Statements as Interest Expense. Borrowing costs under the Previous Credit Agreements related to SFS are reflected in our Condensed Consolidated Income Statements within Cost of Finance Revenues.

Long-Term Debt—As of June 30, 2018, December 31, 2017, and June 30, 2017, Long-Term Debt consisted of the following (in thousands of dollars):

	June 30, 2018			December 31, 2017			June 30, 2017
York Property Mortgage, net of unamortized debt issuance costs of $4,039, $4,545, and $5,050	$	267,082		$	270,556		$	305,907
2022 Senior Notes, net of unamortized debt issuance costs of $0, $2,998, and $3,320	—			297,002			296,680
2025 Senior Notes, net of unamortized debt issuance costs of $5,248, $5,623, and $0	394,752			394,377			—
Less current portion:
York Property Mortgage, net of unamortized debt issuance costs of $1,010, $1,010, and $1,010	(13,423		)	(11,930		)	(38,825		)
2022 Senior Notes, net of unamortized debt issuance costs of $0, $2,998, and $0	—			(297,002		)	—
Total Long-Term Debt, net	$	648,411		$	653,003		$	563,762

See the captioned sections below for information related to the York Property Mortgage, the 2022 Senior Notes, and the 2025 Senior Notes.

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York Property Mortgage—The York Property, which is our headquarters building located at 1334 York Avenue in New York, is subject to a seven-year, $325 million mortgage loan (the "York Property Mortgage") that matures on July 1, 2022. As of June 30, 2018, the outstanding principal balance of the York Property Mortgage was $271.1 million. As of June 30, 2018, the fair value of the York Property Mortgage approximated its book value due to the variable interest rate associated with the mortgage. The fair value measurement is considered to be a Level 2 fair value measurement in the fair value hierarchy as per ASC 820, Fair Value Measurements.

The York Property Mortgage bears interest based on the one-month LIBOR rate plus a spread of 2.25% and is being amortized based on a 25-year mortgage-style amortization schedule over its seven-year term. On June 21, 2017, the York Property Mortgage was amended to reduce the minimum net worth that Sotheby's is required to maintain from $425 million to $325 million in order to provide continued flexibility regarding potential future common stock repurchases. As of June 30, 2018, Sotheby's net worth was $606.7 million. In conjunction with this amendment, on July 3, 2017, we made a prepayment of $32 million to reduce the outstanding principal balance of the York Property Mortgage, and agreed to make annual prepayments funded primarily with cash accumulated in a restricted cash management account, as discussed below, beginning in July 2018 and continuing through July 2021 that are not to exceed $25 million in the aggregate during that period. The $32 million principal payment made on July 3, 2017 was funded with $25 million from existing cash balances and $7 million from a restricted cash management account associated with the York Property Mortgage. On July 2, 2018, a $6.25 million principal payment funded primarily from the restricted cash management account was made in accordance with the June 2017 amendment to the York Property Mortgage. (See Note 9 for information related to the interest protection agreements that were entered into in connection with the York Property Mortgage.)

The York Property, the York Property Mortgage, and the related interest rate protection agreements are held by 1334 York, LLC (the "LLC"), a separate legal entity of Sotheby's that maintains its own books and records and whose results are ultimately consolidated into our Condensed Consolidated Financial Statements. The LLC is the sole owner and lessor of the York Property. The LLC presently leases the York Property to Sotheby's, Inc., which is also controlled by Sotheby's. The assets of the LLC are not available to satisfy the obligations of our other affiliates or any other entity.

The loan agreement governing the York Property Mortgage contains the following financial covenants, which are subject to additional terms and conditions as provided in the underlying loan agreement:

• As of July 1, 2020, the LTV ratio (i.e., the principal balance of the York Property Mortgage divided by the appraised value of the York Property) may not exceed 65% (the "Maximum LTV") based on the then-outstanding principal balance of the York Property Mortgage. If the LTV ratio exceeds the Maximum LTV, the LLC may, at its option, post cash or a letter of credit or pay down the York Property Mortgage without any prepayment penalty or premium, in an amount that will cause the LTV ratio not to exceed the Maximum LTV.

• At all times during the term of the York Property Mortgage, the Debt Yield will not be less than 8.5% (the "Minimum Debt Yield"). The Debt Yield is calculated by dividing the annual net operating income of the LLC, which primarily consists of lease income from Sotheby's, Inc. (calculated on a cash basis), by the outstanding principal balance of the York Property Mortgage. If the Debt Yield falls below the Minimum Debt Yield, the LLC has the option to post cash or a letter of credit or prepay the York Property Mortgage without any prepayment penalty or premium, in an amount that will cause the Debt Yield to exceed the Minimum Debt Yield.

• If Sotheby's corporate credit rating from Standard & Poor’s Rating Services ("S&P") is downgraded to "BB-", the lender may require that the LLC establish cash management accounts (the "Cash Management Accounts") under the lender's control for potential monthly debt service, insurance, and tax payments. If the rating is downgraded to "B+" or "B", the lender may require the LLC to deposit a certain amount of debt service into the Cash Management Accounts (approximately 6 and 12 months of debt service, respectively). If the rating is downgraded to lower than "B", the LLC must make principal payments on the mortgage such that the LTV ratio does not exceed 65%. On February 9, 2016, Sotheby's corporate credit rating from S&P was downgraded to "BB-" from "BB". As a result, a Cash Management Account was established under the control of the lender. The lender will retain any excess cash after monthly debt service, insurance, and taxes as security. On July 3, 2017, $7 million from the Cash Management Account was used to fund a portion of the $32 million principal prepayment of the York Property Mortgage discussed above. As of June 30, 2018, December 31, 2017, and June 30, 2017, the Cash Management Account had a balance of $5.3 million, $3.1 million, and $7.4 million, respectively, which is reflected within Restricted Cash on our Condensed Consolidated Balance Sheets.

• At all times during the term of the York Property Mortgage, we are required to maintain a net worth of at least $325 million, subject to a cure period.

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Senior Unsecured Debt—On September 27, 2012, we issued $300 million aggregate principal amount of 5.25% Senior Notes, due October 1, 2022 (the "2022 Senior Notes"). On December 12, 2017, we issued$400 millionaggregate principal amount of4.875%Senior Notes due on December 15, 2025 (the “2025 Senior Notes”). The net proceeds from the issuance of the 2025 Senior Notes were approximately$395.5 million, after deducting fees paid to the initial purchasers, of which$312.3 millionwas irrevocably deposited with a trustee for the benefit of the holders of the 2022 Senior Notes, which were redeemed using these funds on January 11, 2018, as discussed below. The$312.3 milliondeposited with the trustee was classified within Restricted Cash on our Condensed Consolidated Balance Sheets as of December 31, 2017. The remaining net proceeds from the issuance of the 2025 Senior Notes were used for general corporate purposes, including reductions to revolving credit facility borrowings.

Interest on the 2025 Senior Notes is payable in cash semi-annually in arrears on June 15 and December 15 of each year, beginning June 15, 2018. The 2025 Senior Notes were offered only to qualified institutional buyers in accordance with Rule 144A and to non-U.S. Persons under Regulation S under the Securities Act of 1933, as amended (the "Securities Act"). Holders of the 2025 Senior Notes do not have registration rights, and the 2025 Senior Notes have not been and will not be registered under the Securities Act. The 2025 Senior Notes are guaranteed, jointly and severally, on a senior unsecured basis by certain of our existing and future domestic subsidiaries to the extent and on the same basis that such subsidiaries guarantee borrowings under the Credit Agreement. The 2025 Senior Notes will be redeemable, in whole or in part, on or after December 15, 2020, at specified redemption prices set forth in the underlying indenture, plus accrued and unpaid interest to, but excluding, the redemption date. Prior to December 15, 2020, the 2025 Senior Notes are redeemable, in whole or in part, at a redemption price equal to 100% of the principal amount of the 2025 Senior Notes to be redeemed, plus accrued and unpaid interest to, but excluding, the redemption date, plus a make-whole premium (as defined in the underlying indenture). In addition, at any time prior to December 15, 2020, we may redeem up to 40% of the aggregate principal amount of the 2025 Senior Notes with the net cash proceeds of certain equity offerings at the redemption price of 104.875% plus accrued and unpaid interest. If Sotheby's experiences a Change of Control (as defined in the underlying indenture), we must offer to repurchase all of the 2025 Senior Notes then outstanding at 101% of the aggregate principal amount of the 2025 Senior Notes repurchased, plus accrued and unpaid interest. The underlying indenture for the 2025 Senior Notes also contains customary covenants that limit, among other things, our ability to grant liens on our assets; enter into sale and leaseback transactions; and merge, consolidate or transfer or dispose of substantially all of our assets. The above covenants are subject to a number of exceptions and qualifications set forth in the underlying indenture.

As of June 30, 2018, the $400 million principal amount of the 2025 Senior Notes had a fair value of approximately $382.5 million based on a broker quoted price derived via a pricing model using observable and unobservable inputs. As such, this fair value measurement is considered to be a Level 3 fair value measurement in the fair value hierarchy as per ASC 820.

On January 11, 2018, we redeemed the 2022 Senior Notes for a redemption price of $312.3 million, including the $300 million principal amount plus $4.4 million of accrued interest and a call premium of $7.9 million. As a result of the redemption of the 2022 Senior Notes, we wrote-off $3 million of related unamortized debt issuance costs, which, when combined with the $7.9 million call premium, resulted in a total loss on the extinguishment of debt of $10.9 million recognized in the first quarter of 2018.

Future Principal and Interest Payments—The aggregate future principal and interest payments due under the New Credit Agreement, the York Property Mortgage, and the 2025 Senior Notes during the five-year period after June 30, 2018 are as follows (in thousands of dollars):

Period	Amount
July 2018 to June 2019	$	109,344
July 2019 to June 2020	$	47,174
July 2020 to June 2021	$	46,774
July 2021 to June 2022	$	46,371
July 2022 to June 2023	$	230,678

The table above assumes that the annual interest rate for the York Property Mortgage will be within the interest rate collar's floor and ceiling rates for the remainder of the mortgage term based on available forecasts of LIBOR rates for the future periods through maturity. The table above also assumes York Property Mortgage principal payments consistent with the related mortgage amortization schedule, as well as annual principal prepayments of $6.25 million each July beginning in 2018 and continuing through 2021, as discussed above.

9. Derivative Financial Instruments

Derivative Financial Instruments Designated as Hedging Instruments—The following tables present fair value information related to the derivative financial instruments designated as hedging instruments as of June 30, 2018, December 31, 2017, and June 30, 2017 (in thousands of dollars):

	Assets			Liabilities
June 30, 2018	Balance Sheet Classification	Fair Value		Balance Sheet Classification		Fair Value
Cash Flow Hedges:
Interest rate swap	Other Current Assets	$	274	N/A		$	—
Interest rate collar	N/A	—		Other Current Liabilities		25
Interest rate collar	N/A	—		Other Long-Term Liabilities		207
Total cash flow hedges		274			—	232
Net Investment Hedges:
Foreign exchange contracts	Other Current Assets	4,444		N/A		—
Total		$	4,718			$	232

	Assets			Liabilities
December 31, 2017	Balance Sheet Classification	Fair Value		Balance Sheet Classification	Fair Value
Cash Flow Hedges:
Interest rate swap	Other Current Assets	$	339	N/A	$	—
Interest rate collar	N/A	—		Other Current Liabilities	666
Interest rate collar	N/A	—		Other Long-Term Liabilities	1,501
Total cash flow hedges		339			2,167
Net Investment Hedges:
Foreign exchange contracts	N/A	—		Other Current Liabilities	3,756
Total		$	339		$	5,923

	Assets			Liabilities
June 30, 2017	Balance Sheet Classification	Fair Value		Balance Sheet Classification	Fair Value
Cash Flow Hedges:
Interest rate swaps	Other Current Assets	$	308	N/A	$	—
Interest rate collar	N/A	—		Other Current Liabilities	1,550
Interest rate collar	N/A	—		Other Long-Term Liabilities	3,257
Total cash flow hedges		308			4,807
Net Investment Hedges:
Foreign exchange contracts	N/A	—		Other Current Liabilities	2,176
Total		$	308		$	6,983

During the six months ended June 30, 2018, we settled derivative financial instruments designated as net investment hedges with an aggregate notional value of $97.9 million and realized a net loss of ($5.9) million. During the six months ended June 30, 2017, we settled derivative financial instruments designated as net investment hedges with an aggregate notional value of $213.8 million and realized a net gain of $29.1 million. Realized gains and losses related to the settlement of derivative financial instruments designated as net investment hedges are reflected on our Condensed Consolidated Balance Sheets within Accumulated Other Comprehensive Loss.

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The following tables summarize the effect of the derivative financial instruments designated as hedging instruments on our Condensed Consolidated Income Statements and Consolidated Condensed Statements of Comprehensive Income for the three and six months ended June 30, 2018 and 2017 (in thousands of dollars):

	Gain (Loss) Recognized in Other Comprehensive Income - Effective Portion					Classification of Gain (Loss) Reclassified from Accumulated Other Comprehensive Loss into Net Income	Amount Reclassified from Accumulated Other Comprehensive Loss into Net Income - Effective Portion						Amount Reclassified from Accumulated Other Comprehensive Loss into Net Income - Ineffective Portion
Three Months Ended June 30,	2018		2017				2018			2017			2018		2017
Cash Flow Hedges:
Interest rate swaps	$	15	$	(7	)	Interest Expense	$	(93	)	$	(50	)	$	—	$	—
Interest rate collar	207		(527		)	Interest Expense	7			—			—		—
Interest rate collar	—		—			Non-operating income	—			—			—		622
Total cash flow hedges	222		(534		)		(86		)	(50		)	—		622
Net Investment Hedges:
Foreign exchange contracts	3,350		(1,454		)	N/A	—			—			—		—
Total	$	3,572	$	(1,988	)		$	(86	)	$	(50	)	$	—	$	622

	Gain (Loss) Recognized in Other Comprehensive Income - Effective Portion					Classification of Gain (Loss) Reclassified from Accumulated Other Comprehensive Loss into Net Income	Amount Reclassified from Accumulated Other Comprehensive Loss into Net Income - Effective Portion					Amount Reclassified from Accumulated Other Comprehensive Loss into Net Income - Ineffective Portion
Six Months Ended June 30,	2018		2017				2018			2017		2018		2017
Cash Flow Hedges:
Interest rate swaps	$	95	$	134		Interest Expense	$	(145	)	$	35	$	—	$	—
Interest rate collar	1,187		85			Interest Expense	169			—		—		—
Interest rate collar	—		—			Non-operating income	—			—		—		622
Total cash flow hedges	1,282		219				24			35		—		622
Net Investment Hedges:
Foreign exchange contracts	1,740		(2,078		)	N/A	—			—		—		—
Total	$	3,022	$	(1,859	)		$	24		$	35	$	—	$	622

See the captioned sections below for information related to the derivative financial instruments designated as cash flow hedges or net investment hedges.

Derivative Financial Instruments Designated as Cash Flow Hedges—In connection with the York Property Mortgage (see Note 8), we entered into interest rate protection agreements secured by the York Property, consisting of a 2-year interest rate swap (the "Mortgage Swap"), effective as of July 1, 2015, and a 5-year interest rate collar (the "Mortgage Collar"), effective as of July 1, 2017. The Mortgage Swap fixed the LIBOR rate on the York Property Mortgage at an annual rate equal to 0.877% through its July 1, 2017 expiration date. The Mortgage Collar effectively fixes the LIBOR rate on the York Property Mortgage at an annual rate of no less than 1.917%, but no more than 3.75%, for the remainder of the mortgage's 7-year term. After taking into account the interest rate protection agreements, the annual interest rate for the first two years of the York Property Mortgage was approximately 3.127% and then will be between a floor of 4.167% and a cap of 6% for its remaining 7-year term. Beginning on the effective date of the Mortgage Collar and through June 30, 2018, the weighted average interest rate for the York Property Mortgage was 4.172%.

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In conjunction and concurrent with the June 2017 amendment to the York Property Mortgage (see Note 8), the notional value of the Mortgage Collar was reduced by $57 million to reflect: (i) the $32 million principal prepayment made on the York Property Mortgage on July 3, 2017 and (ii) potential annual prepayments of $6.25 million each, beginning in July 2018 and continuing through July 2021. The reduction in the notional value of the Mortgage Collar relates to previously forecasted interest payments that are no longer probable of occurring following the June 2017 amendment to the York Property Mortgage. The reduction in the notional value of the Mortgage Collar resulted in a $0.6 million (net of tax) reclassification from Accumulated Other Comprehensive Loss into Net Income in the second quarter of 2017.

As of June 30, 2018, the notional value of the Mortgage Collar was $271.1 million, which is equal to the principal balance of the York Property Mortgage on that date. For the remainder of its term, the Mortgage Collar will have a notional value that is no greater than the applicable forecasted principal balance of the York Property Mortgage. The York Property, the York Property Mortgage, and the related interest rate protection agreement(s) are held by 1334 York, LLC, a separate legal entity of Sotheby's that maintains its own books and records and whose results are ultimately consolidated into our financial statements.

On November 21, 2016, we entered into a two-year interest rate swap agreement to eliminate the variability in expected cash outflows associated with the one-month LIBOR-indexed interest payments owed on $63 million of revolving credit facility borrowings (the "Revolving Credit Facility Swap"). As of June 30, 2018, the notional value of the Credit Facility Swap was $63 million.

At their inception, the Mortgage Swap, the Mortgage Collar, and the Revolving Credit Facility Swap (collectively, the "Cash Flow Hedges") were each individually designated as cash flow hedges of the risk associated with the variability in expected cash outflows related to the one-month LIBOR-indexed interest payments owed on their respective debt instruments. Accordingly, to the extent that each of the Cash Flow Hedges is effective, any unrealized gains and losses related to changes in their fair value are recorded to Accumulated Other Comprehensive Loss on our Condensed Consolidated Balance Sheets and then reclassified to Interest Expense in our Condensed Consolidated Income Statements in the same period that interest expense related to the underlying debt instruments is recorded. Any hedge ineffectiveness is immediately recognized in Net Income. In addition, if any of the forecasted transactions associated with the Cash Flow Hedges are no longer probable of occurring, any related amounts previously recorded in Accumulated Other Comprehensive Loss on our Condensed Consolidated Balance Sheets would be immediately reclassified into Net Income. As discussed above, certain previously forecasted interest payments associated with the Mortgage Collar became no longer probable of occurring in the second quarter of 2017 and, as a result, $0.6 million (net of tax) of the amount previously recorded in Accumulated Other Comprehensive Loss was immediately reclassified into Net Income in the second quarter of 2017.

Management performs a quarterly assessment to determine whether each of the outstanding Cash Flow Hedges continues to be highly effective in hedging the risk associated with the variability in expected cash outflows related to the one-month LIBOR-indexed interest payments on their respective debt instruments. As of June 30, 2018, each of the outstanding Cash Flow Hedges, including the Mortgage Collar, as amended, is expected to continue to be highly effective in hedging the risk associated with the variability in expected cash outflows related to the one-month LIBOR-indexed interest payments on their respective debt instruments.

The assets and liabilities associated with the Cash Flow Hedges have been designated as Level 2 fair value measurements within the fair value hierarchy provided by ASC 820. Level 2 fair value measurements have pricing inputs other than quoted prices in active markets, which are either directly or indirectly observable as of the reporting date. Level 2 fair value measurements may be determined through the use of models or other valuation methodologies. The fair value of the Mortgage Swap was based on a discounted cash flow methodology using the contractual terms of the instrument and observable LIBOR-curve rates that are consistent with the timing of the interest payments related to the York Property Mortgage. The fair value of the Mortgage Collar is based on an option pricing model using observable LIBOR-curve rates for each forecasted monthly settlement, with the projected cash flows discounted using the contractual terms of the instrument. The fair value of the Revolving Credit Facility Swap is based on a discounted cash flow methodology using the contractual terms of the instrument and observable LIBOR-curve rates that are consistent with the timing of the interest payments related to our revolving credit facility.

Derivative Financial Instruments Designated as Net Investment Hedges—We are exposed to variability in the U.S. Dollar equivalent of the net investments in our foreign subsidiaries and, by extension, the U.S. Dollar equivalent of any foreign earnings repatriated to the U.S. due to potential changes in foreign currency exchange rates. As a result, we regularly enter into foreign currency forward exchange contracts to hedge the net investments in our foreign subsidiaries from which we expect to repatriate earnings to the U.S. As of June 30, 2018, the aggregate notional value of our outstanding net investment hedge contracts was $56.3 million.

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We use the forward rate method to assess the effectiveness of our net investment hedges. Under the forward rate method, if both the notional value of the derivative designated as a hedge of a net investment in a foreign subsidiary equals the portion of the net investment designated as being hedged and the derivative relates solely to the foreign exchange rate between the functional currency of the hedged net investment and the investor’s functional currency, then all changes in fair value of the derivative are reported in the cumulative translation adjustment accounts within Accumulated Other Comprehensive Loss on our Condensed Consolidated Balance Sheets.

The foreign currency forward exchange contracts designated as net investment hedges are considered Level 2 fair value measurements within the fair value hierarchy provided by ASC 820. Level 2 fair value measurements have pricing inputs other than quoted prices in active markets, which are either directly or indirectly observable as of the reporting date, and fair value may be determined through the use of models or other valuation methodologies. The fair value of these foreign currency forward exchange contracts is based on the estimated amount to settle the contracts using applicable market exchange rates as of the balance sheet date.

Derivative Financial Instruments Not Designated as Hedging Instruments—We also utilize forward contracts to hedge cash flow exposures related to foreign currency exchange rate movements arising from short-term foreign currency denominated intercompany balances and, to a much lesser extent, foreign currency denominated client payable balances, as well as foreign currency denominated auction guarantee obligations. Such forward exchange contracts are typically short-term with settlement dates less than six months from their inception. These instruments are not designated as hedging instruments for accounting purposes. Accordingly, changes in the fair value of these instruments are recognized in our Condensed Consolidated Income Statements in Non-Operating Income.

As of June 30, 2018, the notional value of outstanding forward exchange contracts not designated as hedging instruments was $251.9 million. Notional values do not quantify risk or represent assets or liabilities, but are used to calculate cash settlements under outstanding forward exchange contracts. We are exposed to credit-related risks in the event of nonperformance by the counterparties to our outstanding forward exchange contracts that are not designated as hedging instruments. We do not expect any of these counterparties to fail to meet their obligations, given their investment grade short-term credit ratings. As of June 30, 2018, the aggregate fair value of these contracts represented an asset of $3.7 million, which was recorded on our Condensed Consolidated Balance Sheets within Prepaid Expenses and Other Current Assets. As of December 31, 2017 and June 30, 2017, the aggregate fair value of these contracts represented liabilities of $0.8 million and $1.4 million, respectively, which were recorded on our Condensed Consolidated Balance Sheets within Accounts Payable and Accrued Liabilities.

10. Sale of Pink Diamond

In the second quarter of 2016, we sold an undivided legal and beneficial 50% ownership interest in a Fancy Vivid Pink Diamond (the "Pink Diamond") held in Inventory for $34.2 million in cash, which was recorded on our Condensed Consolidated Balance Sheets within Other Current Liabilities. In April 2017, at our Magnificent Jewels and Jadeite Sale in Hong Kong (the "Auction"), the Pink Diamond was sold for a total purchase price of approximately $71.2 million (the "Purchase Price"). Although the Auction occurred in the second quarter of 2017, the sale was recognized in our financial statements in the third quarter of 2017 upon collection of the Purchase Price from the winning bidder in September 2017. Upon the collection of the Purchase Price, the $68.4 million carrying value of the Pink Diamond was removed from Inventory and the related $34.2 million cash payment received in the second quarter of 2016 was removed from Other Current Liabilities. The sale of the Pink Diamond resulted in a gain of approximately $0.4 million in 2017, after taking into account the associated Cost of Inventory Sales of $70.8 million, which includes amounts due to our partner in the Pink Diamond and other costs related to the sale.

11. Supplemental Condensed Consolidated Balance Sheet Information

Prepaid and Other Current Assets—As of June 30, 2018, December 31, 2017, and June 30, 2017, Prepaid Expenses and Other Current Assets consisted of the following (in thousands of dollars):

	June 30, 2018		December 31, 2017		June 30, 2017
Prepaid expenses	$	25,586	$	25,418	$	27,293
Derivative financial instruments (see Note 9)	274		339		308
Insurance recoveries	2,335		—		—
Other	15,067		6,253		17,854
Total Prepaid Expenses and Other Current Assets	$	43,262	$	32,010	$	45,455

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Other Long-Term Assets—As of June 30, 2018, December 31, 2017, and June 30, 2017, Other Long-Term Assets consisted of the following (in thousands of dollars):

	June 30, 2018		December 31, 2017		June 30, 2017
Defined benefit pension plan asset	$	107,647	$	108,826	$	86,317
Equity method investments (a)	46,789		46,905		47,299
Trust assets related to deferred compensation liability	30,017		26,240		25,128
Restricted cash (see Note 12)	17,442		17,916		17,332
Insurance recoveries	12,782		12,242		14,527
Other	15,136		15,479		2,392
Total Other Long-Term Assets	$	229,813	$	227,608	$	192,995

(a) Includes our equity method investments in RM Sotheby's and AMA, as well as a partnership that was formed in the second quarter of 2017 through which artworks are being purchased and sold.

Other Long-Term Liabilities—As of June 30, 2018, December 31, 2017, and June 30, 2017, Other Long-Term Liabilities consisted of the following (in thousands of dollars):

	June 30, 2018		December 31, 2017		June 30, 2017
Deferred compensation liability	$	29,605	$	25,614	$	24,477
Acquisition earn-out consideration	8,750		17,500		17,500
Interest rate collar liability (see Note 9)	207		1,501		3,257
Other	7,609		6,809		6,623
Total Other Long-Term Liabilities	$	46,171	$	51,424	$	51,857

12. Supplemental Condensed Consolidated Cash Flow Information

Cash, Cash Equivalents, and Restricted Cash—As of June 30, 2018, December 31, 2017, and June 30, 2017, cash, cash equivalents, and restricted cash consisted of the following (in thousands of dollars):

	June 30, 2018		December 31, 2017		June 30, 2017
Cash and cash equivalents	$	432,357	$	544,432	$	516,402
Restricted cash, recorded within current assets:
Consignor funds held in legally segregated accounts	23,528		46,029		33,164
Funds deposited with the trustee for the redemption of the 2022 Senior Notes (see Note 8)	—		312,250		—
Cash Management Account related to the York Property Mortgage (see Note 8)	5,264		3,107		7,434
Other	187		192		660
Restricted cash, recorded within current assets	28,979		361,578		41,258
Restricted cash, recorded within other long-term assets (a)	17,442		17,916		17,332
Total restricted cash	46,421		379,494		58,590
Cash, cash equivalents, and restricted cash	$	478,778	$	923,926	$	574,992

(a) Restricted cash reflected within Other Long-Term Assets principally relates to $15.3 million of funds held in escrow pending the final settlement of a sale.

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Changes in Other Operating Assets and Liabilities—For the six months ended June 30, 2018 and 2017, changes in other operating assets and liabilities as reported in the Condensed Consolidated Statements of Cash Flows included the following (in thousands of dollars):

	Six Months Ended June 30,
	2018			2017
(Increase) decrease in:
Prepaid expenses and other current assets	$	(8,233	)	$	2,342
Other long-term assets	(3,611		)	(1,306		)
Income tax receivables and deferred income tax assets	(9,782		)	(20,896		)
(Decrease) increase in:
Accounts payable and accrued liabilities and other liabilities	(23,870		)	(20,575		)
Accrued income taxes and deferred income tax liabilities	4,126			(2,872		)
Total changes in other operating assets and liabilities	$	(41,370	)	$	(43,307	)

13. Shareholders' Equity and Dividends

Common Stock Repurchase Program—On February 28, 2018, the Board of Directors approved a $100 million increase to our share repurchase authorization, resulting in an updated share repurchase authorization of $195.7 million as of that date.

The following table provides information regarding our common stock repurchase program for the six months ended June 30, 2018 and 2017 (in thousands, except for per share data):

	Six Months Ended
	June 30, 2018		June 30, 2017
Shares repurchased	1,193		740
Aggregate purchase price	$	62,497	$	33,940
Average price per share	$	52.40	$	45.86

As of August 3, 2018, $133.2 million remained available under the current share repurchase authorization.

Management expects to continue to repurchase shares of common stock via open market purchases, purchases made pursuant to a Rule 10b5-1 plan, and/or accelerated share repurchase agreements, subject to the factors described below. The timing of further share repurchases and the actual amount purchased will depend on a variety of factors including the market price of our common stock, general market and economic conditions, securities law requirements, and other corporate considerations. Repurchases may continue to be made pursuant to plans intended to comply with Rule 10b5-1 under the Exchange Act, which allows us to purchase our shares during periods when we otherwise might be prevented from doing so under insider trading laws or because of self-imposed trading blackout periods. The repurchase authorization does not require the purchase of a specific number of shares and is subject to suspension or termination by our Board of Directors at any time.

Special Dividend—On January 29, 2014, the Board of Directors declared a special dividend of $300 million ($4.34 per share) that was paid on March 17, 2014. In conjunction with this special dividend, we accrued approximately $10 million for dividend equivalents owed on share-based payments to employees, which we charged to retained earnings. For the six months ended June 30, 2017, $2 million of such dividends were paid to employees upon the vesting of the share-based payments. No such dividends were paid during the six months ended June 30, 2018.

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14. Accumulated Other Comprehensive Loss

The following is a summary of the changes in Accumulated Other Comprehensive Loss and the details regarding any reclassification adjustments made for the three and six months ended June 30, 2018 and 2017 (in thousands of dollars):

	Three Months Ended June 30,						Six Months Ended June 30,
	2018			2017			2018			2017
Currency Translation Adjustments
Balance at beginning of period	$	(67,280	)	$	(86,853	)	$	(74,505	)	$	(89,478	)
Other comprehensive (loss) income before reclassifications, net of tax of $0, $835, $400, and $1,421	(14,238		)	6,526			(7,013		)	9,151
Other comprehensive (loss) income	(14,238		)	6,526			(7,013		)	9,151
Balance at end of period	(81,518		)	(80,327		)	(81,518		)	(80,327		)
Cash Flow Hedges
Balance at beginning of period	141			(2,826		)	(1,029		)	(3,664		)
Other comprehensive income (loss) before reclassifications, net of tax of $73, ($331), $423, and $135	222			(534		)	1,282			219
Reclassifications from accumulated other comprehensive loss, net of tax of ($28), $354, $8, and $407	(86		)	572			24			657
Other comprehensive income	136			38			1,306			876
Balance at end of period	277			(2,788		)	277			(2,788		)
Net Investment Hedges
Balance at beginning of period	11,949			15,994			13,559			16,618
Other comprehensive income (loss) before reclassifications, net of tax of $1,094, ($885), $569, and ($1,270)	3,350			(1,454		)	1,740			(2,078		)
Other comprehensive income (loss)	3,350			(1,454		)	1,740			(2,078		)
Balance at end of period	15,299			14,540			15,299			14,540
Defined Benefit Pension Plan
Balance at beginning of period	(434		)	(13,855		)	(491		)	(13,834		)
Currency translation adjustments	32			(571		)	7			(800		)
Other comprehensive income (loss) before reclassifications	32			(571		)	7			(800		)
Prior service cost amortization, net of tax of ($4), ($3), ($8), and ($7)	(21		)	(20		)	(43		)	(39		)
Actuarial loss amortization, net of tax of $19, $45, $40, and $91	102			235			206			462
Reclassifications from accumulated other comprehensive loss, net of tax	81			215			163			423
Other comprehensive income (loss)	113			(356		)	170			(377		)
Balance at end of period	(321		)	(14,211		)	(321		)	(14,211		)
Total other comprehensive (loss) income attributable to Sotheby's	(10,639		)	4,754			(3,797		)	7,572
Accumulated other comprehensive loss as of June 30	$	(66,263	)	$	(82,786	)	$	(66,263	)	$	(82,786	)

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	Three Months Ended June 30,						Six Months Ended June 30,
	2018			2017			2018			2017
Cash Flow Hedges
Settlements	$	(114	)	$	926		$	32		$	1,064
Tax effect	28			(354		)	(8		)	(407		)
Reclassification adjustments, net of tax	(86		)	572			24			657
Defined Benefit Pension Plan
Prior service cost amortization	(26		)	(23		)	(52		)	(46		)
Actuarial loss amortization	122			280			247			553
Pre-tax total	96			257			195			507
Tax effect	(15		)	(42		)	(32		)	(84		)
Reclassification adjustments, net of tax	81			215			163			423
Total reclassification adjustments, net of tax	$	(5	)	$	787		$	187		$	1,080

15. Commitments and Contingencies

Compensation Arrangements—We are party to compensation arrangements with certain senior employees, which expire at various points between March 31, 2020 and December 31, 2022. Such arrangements may provide, among other benefits, for minimum salary levels and for compensation under our incentive compensation programs that is payable only if specified Company and individual goals are attained. Additionally, under certain circumstances, certain of these arrangements provide annual share-based payments, severance payments, and other cash compensation. The aggregate remaining commitment for salaries and other cash compensation related to these compensation arrangements, excluding any participation in our incentive compensation programs, was approximately $14.1 million as of June 30, 2018.

Guarantees of Collection—A guarantee of collection is a commitment to a consignor that, under certain conditions, Sotheby's will fund the payment of the net sale proceeds to the consignor even if the purchaser has not yet made payment. It is not a guarantee that the property will be sold at a certain minimum price. In the event that any item subject to a guarantee of collection is sold and the purchaser does not pay by the settlement date, we are required to pay the consignor the net sale proceeds, but would then take title to the property and have the right to pursue the defaulting buyer and/or reoffer the property at a future sale. In certain limited circumstances, we may also have the right to recover the net sale proceeds from the consignor in the event of an ultimate purchaser default.As of June 30, 2018, we had a guarantee of collection outstanding related to property that sold for a hammer price of $26.8 million in April 2018. The remaining amount owed by the buyer is due to be paid in the fourth quarter of 2018.

Tax Contingencies—We are subject to laws and regulations in many countries involving sales, use, value-added and other indirect taxes which are assessed by various governmental authorities and imposed on certain revenue-producing transactions between us and our clients. The application of these laws and regulations to our unique business and global client base, and the estimation of any related liabilities, is complex and requires a significant amount of judgment. We are generally not responsible for these indirect tax liabilities unless we fail to collect the correct amount of sales, value-added, or other indirect taxes. Failure to collect the correct amount of indirect tax on a transaction may expose us to claims from tax authorities and could require us to record a liability and corresponding charge to our statement of operations.

Legal Contingencies—We become involved in various claims and lawsuits incidental to the ordinary course of our business. We are required to assess the likelihood of any adverse judgments or outcomes related to these legal contingencies, as well as potential ranges of probable or reasonably possible losses. The determination of the amount of any losses to be recorded or disclosed as a result of these contingencies is based on a careful analysis of each individual exposure with, in some cases, the assistance of outside legal counsel. The amount of losses recorded or disclosed for such contingencies may change in the future due to new developments in each matter or a change in settlement strategy. While the impact of any one or more legal claims or proceedings could be material to our operating results in any period, we do not believe that the outcome of any of these pending claims or proceedings, individually or in the aggregate, will have a material adverse effect on our consolidated financial condition.

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On November 17, 2017, Sotheby’s, together with its London, Geneva and Vienna subsidiaries, and one of its employees (collectively, “the Sotheby’s Parties”), initiated a declaratory judgment action (requête en conciliation) in Switzerland (the “Swiss Action”), at the Tribunal de Première Instance de la République et Canton de Genève, against Dmitry Rybolovlev and various persons and entities affiliated with him. The Sotheby’s Parties’ action seeks a declaration that the Sotheby’s Parties owe no liability or debt to Mr. Rybolovlev and his affiliates in connection with sales of art and related services to entities affiliated with Mr. Yves Bouvier, as discussed in more detail below.     

The Sotheby’s Parties filed the Swiss Action in response to the stated intent of Mr. Rybolovlev’s counsel to initiate litigation in the U.K. against several of the Sotheby’s Parties. Specifically, on October 27, 2017, counsel for entities affiliated with Mr. Rybolovlev filed papers with the U.S. District Court for the Southern District of New York requesting authority to use documents previously obtained from Sotheby’s pursuant to 28 U.S.C. § 1782. This statute allows parties to conduct discovery in the U.S. for use in foreign legal proceedings. Mr. Rybolovlev sought discovery to support a contemplated U.K. proceeding alleging that Sotheby’s and its agents aided and abetted an alleged fraud that Mr. Bouvier allegedly perpetrated against Mr. Rybolovlev and affiliated entities. On December 22, 2017, the District Court in New York approved Mr. Rybolovlev’s request to use Sotheby’s previously disclosed documents both in the contemplated U.K. proceedings, and in the Sotheby’s Parties’ Swiss declaratory judgment proceeding against Mr. Rybolovlev and his affiliates. To date, we are not aware of Mr. Rybolovlev actually filing the threatened U.K. litigation against Sotheby’s, and believe that Geneva is the correct venue for the dispute, that the Lugano Convention effectively precludes Mr. Rybolovlev from sustaining an action in the U.K., and that the Sotheby’s Parties will prevail in the Swiss Action.

16. Income Taxes

The U.S. Tax Cuts and Jobs Act (the “Act”) was signed into law on December 22, 2017. The Act includes significant changes to the U.S. corporate income tax system that became effective on January 1, 2018, including, among other things, (i) a reduction of the U.S. corporate income tax rate from 35% to 21%, (ii) the transition to a modified territorial tax system from a worldwide tax system, (iii) limitations on the deductibility of interest expense and executive compensation, (iv) the imposition of the Base Erosion Anti-Abuse Tax (“BEAT”), a new minimum tax on international payments meant to reduce the ability of multinational companies to erode the U.S. tax base through deductible payments to related parties, and (v) the creation of two new categories of income: (a) foreign-derived intangible income (“FDII”), which is income derived from the sale of property or services to a foreign person which may be taxed at a rate lower than 21%, and (b) global intangible low taxed income (“GILTI”), which is certain income earned by foreign subsidiaries that must be included in the income of the U.S. shareholder. In addition, the Act imposed a one-time transition tax in 2017 on the mandatory deemed repatriation of certain unremitted foreign earnings as of December 31, 2017.   

Soon after the Act was signed into law, the SEC issued Staff Accounting Bulletin No. 118 (“SAB 118"), which allows companies to record the income tax effects of the Act as a provisional amount based on reasonable estimates. The provisional amount is subject to adjustment as companies complete their analysis of the Act, and collect and prepare the necessary data, and interpret any additional guidance issued by the U.S. Treasury Department, IRS, the FASB, and other standard-setting and regulatory bodies. Any such adjustments may be made within a subsequent measurement period, which should not extend beyond one year from the enactment date.

In accordance with SAB 118, in the fourth quarter of 2017, we recorded a provisional net income tax expense of approximately $1.2 million based on reasonable estimates of the tax effects of the Act, which included an expense of $40.4 million to record a liability for the one-time mandatory transition tax on certain unremitted and untaxed earnings of our foreign subsidiaries. In the second quarter of 2018, we recorded an income tax benefit of approximately $2.3 million to reduce this liability as a result of guidance that was issued by the IRS during the period and as a result of revisions made to certain estimates used in the calculation as of December 31, 2017.

The provisional net income tax expense recorded in the fourth quarter of 2017 also included an expense of $19.8 million to reduce the value of our net deferred tax assets, primarily as a result of the change in the U.S. corporate income tax rate from 35% to 21%. In the second quarter of 2018, we recorded an income tax benefit of $2.6 million to adjust the remeasurement of our net deferred tax asset based on further analysis of available tax accounting methods and elections.

As of June 30, 2018, we are continuing to gather additional information and expect to complete our accounting for the tax effects of the Act within the prescribed measurement period, which will not exceed one year from the December 22, 2017 enactment date.

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We are still evaluating the GILTI provisions of the Act in order to determine whether we will make an accounting policy election to recognize deferred taxes for temporary basis differences expected to reverse as GILTI income in future periods or to provide for the tax expense related to GILTI in the year in which the tax is incurred. Accordingly, no deferred taxes have been provided for GILTI income.

As of June 30, 2018, our Condensed Consolidated Balance Sheets reflect a provisional income tax payable of $20.2 million within long-term liabilities on our Condensed Consolidated Balance Sheets, for the one-time mandatory transition tax on unremitted foreign earnings discussed above. We intend to elect to settle this liability in installments over eight years, as allowed by the Act.

17. Uncertain Tax Positions

As of June 30, 2018, our liability for unrecognized tax benefits, excluding interest and penalties, was $12.3 million, representing a net decrease of $0.9 million when compared to a liability of $13.2 million as of December 31, 2017. This net decrease is primarily the result of the expiration of the statute of limitations for certain tax years and the settlement of a tax audit, partially offset by the accrual of tax reserves related to transfer pricing and other U.S. federal and state and non-U.S. matters, and an increase due to changes in foreign exchange rates. As of June 30, 2017, our liability for unrecognized tax benefits, excluding interest and penalties, was $20.4 million.

As of June 30, 2018, December 31, 2017, and June 30, 2017, the total amount of unrecognized tax benefits that, if recognized, would favorably impact our effective income tax rate was $4.5 million, $4.1 million, and $9.6 million, respectively. We believe it is reasonably possible that a decrease of $2.6 million in the balance of unrecognized tax benefits can occur within 12 months of the June 30, 2018 balance sheet date as a result of the expiration of statutes of limitations and the expected settlement of ongoing tax audits.

We are subject to taxation in the U.S., as well as in various U.S. state and foreign jurisdictions. As a result, we are subject to tax audits in these jurisdictions. We are currently under examination by various U.S. state and foreign taxing authorities. The earliest open tax year for the major jurisdictions in which we do business, which includes the U.S. (including various state and local jurisdictions), the U.K., and Hong Kong, is 2011.

We recognize interest expense and penalties related to unrecognized tax benefits as a component of Income Tax Expense in our Condensed Consolidated Income Statements. For the three months ended June 30, 2018, the accrual of such interest and penalties increased by approximately $0.1 million.

Our policy is to record interest expense related to sales, value added and other non-income based taxes as Interest Expense in our Condensed Consolidated Income Statements. Penalties related to such taxes are recorded as General and Administrative Expenses in our Condensed Consolidated Income Statements . Interest expense and penalties related to income taxes are recorded as a component of Income Tax Expense in our Condensed Consolidated Income Statements.

18. Auction Guarantees

As of June 30, 2018, we had outstanding auction guarantees totaling $31.2 million. Each of the auction guarantees outstanding as of June 30, 2018 has a minimum guaranteed price that is within or below the range of the pre-sale auction estimates for the underlying property. All of the property related to these auction guarantees is being offered at auctions during the second half of 2018. Our financial exposure under these auction guarantees is reduced by $31.2 million as a result of our use of contractual risk sharing arrangements with third parties. Such risk sharing arrangements include irrevocable bid arrangements and, from time-to-time, partner sharing arrangements. As a result of these risk-sharing arrangements, we did not have any net financial exposure related to the auction guarantees that were outstanding as of June 30, 2018.

The counterparties to our auction guarantee risk sharing arrangements are typically major international art dealers or major art collectors. We could be exposed to losses in the event any of these counterparties do not perform according to the terms of these contractual arrangements.

Although risk sharing arrangements may be used to reduce the risk associated with auction guarantees, we may also enter into auction guarantees without securing such arrangements. In these circumstances, we could be exposed to deterioration in auction commission margins and/or auction guarantee losses if one or more of the guaranteed items fails to sell at its minimum guaranteed price. Furthermore, in such situations, our liquidity could be reduced.

(See Note 4 for additional information related to our use of auction guarantees and related risk sharing arrangements.)

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We are obligated under the terms of certain auction guarantees to advance all or a portion of the guaranteed amount prior to auction. There were no auction guarantee advances outstanding as of June 30, 2018, December 31, 2017, and June 30, 2017. As of June 30, 2018, December 31, 2017, and June 30, 2017, the estimated fair value of our obligation to perform under our outstanding auction guarantees totaled $0.9 million, $0.9 million, and $0.4 million, respectively, and is recorded within Accounts Payable and Accrued Liabilities on our Condensed Consolidated Balance Sheets.

As of August 3, 2018, we had outstanding auction guarantees totaling $194 million and, as of that date, our financial exposure was reduced by risk-sharing arrangements totaling $81.2 million. As a result of these risk-sharing arrangements, our net financial exposure related to auction guarantees was $112.8 million as of August 3, 2018. Each of the auction guarantees outstanding as of August 3, 2018 has a minimum guaranteed price that is within or below the range of the pre-sale auction estimates for the underlying property. The property related to these auction guarantees is being offered at auctions during the second half of 2018 and throughout 2019. As of August 3, 2018, we have advanced $1 million of the total guaranteed amount.

19. Share-Based Payments

Share-based payments made to employees include performance-based stock unit awards, market-based stock unit awards, restricted stock units, restricted shares, and stock options. Share-based payments are also made to members of our Board of Directors through the issuance of common stock and deferred stock units. A description of each of these share-based payments is provided below.

For the three and six months ended June 30, 2018 and 2017, compensation expense related to share-based payments was as follows (in thousands of dollars):

	Three Months Ended June 30,				Six Months Ended June 30,
	2018		2017		2018		2017
Pre-tax	$	6,312	$	5,946	$	14,689	$	12,015
After-tax	$	5,087	$	3,940	$	11,726	$	7,997

For the six months ended June 30, 2018 and 2017, we recognized $1.2 million and $2.6 million, respectively, in excess tax benefits related to share-based payments in our Condensed Consolidated Income Statements. These tax benefits represent the amount by which the tax deduction resulting from the vesting of share-based payments in the period exceeded the tax benefit initially recognized in our Condensed Consolidated Financial Statements.

As of June 30, 2018, unrecognized compensation expense related to the unvested portion of share-based payments to employees was $37.3 million. This compensation expense is expected to be amortized over a weighted-average period of approximately 2.25 years. We do not capitalize any compensation expense related to share-based payments to employees.

Shareholder Approval of 2018 Equity Incentive Plan—The Sotheby’s 2018 Equity Incentive Plan (the “Equity Plan”) was adopted by our Board of Directors on February 28, 2018 and approved by our stockholders on May 3, 2018. The Equity Plan replaces the Sotheby’s Restricted Stock Unit Plan (as amended and restated, the "Restricted Stock Unit Plan") and the Sotheby’s 1997 Stock Option Plan (collectively, the “Prior Plans”), which are discussed in more detail below. The Equity Plan permits the issuance of restricted stock, restricted stock units, performance shares, performance share units, stock options, stock appreciation rights (or, "SAR's"), and other equity-related awards. No further awards will be granted under the Prior Plans after May 3, 2018. However, the terms and conditions of the Prior Plans and related award agreements will continue to apply to all awards granted prior to May 3, 2018 under the Prior Plans.

The Equity Plan is a fungible share plan. Each option or SAR granted under the Equity Plan will count as one share from the available share pool. Each full-value award granted under the Equity Plan, including restricted stock units and performance share units, will count as 2.14 shares from the available pool.

Restricted Stock Unit Plan—Prior to May 3, 2018, the Restricted Stock Unit Plan provided for the issuance of restricted stock units ("RSU's") and restricted shares to employees. Awards made under the Restricted Stock Unit Plan were subject to the approval of the Compensation Committee of our Board of Directors. In making awards under the Restricted Stock Unit Plan, the Compensation Committee took into account the nature of the services rendered by employees, their present and potential future contributions to Sotheby's success, and such other factors as the Compensation Committee in its discretion deemed relevant.

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RSU's and restricted shares issued under the Restricted Stock Unit Plan generally vest evenly over a three-year service period. Prior to vesting, holders of RSU's and restricted shares issued under the Restricted Stock Unit Plan are entitled to receive non-forfeitable dividend equivalents and dividends, respectively, at the same rate as dividends are paid on our common stock (if and when such dividends are paid). Prior to vesting, holders of RSU's issued under the Restricted Stock Unit Plan do not have voting rights, while holders of restricted shares have voting rights. RSU's and restricted shares may not be sold, assigned, transferred, pledged or otherwise encumbered until they vest.

For RSU's and restricted shares issued after May 3, 2018 under the new Equity Plan, dividend equivalents will generally be credited to holders of RSU's at the same rate as dividends are paid on our common stock (if and when such dividends are paid), but will only be paid for RSU's and restricted shares that vest.

Performance Share Units (or "PSU's") are RSU's that generally vest over three or four-year service periods, subject to the achievement of certain profitability targets (for awards granted prior to 2016) or certain return on invested capital ("ROIC") targets (for awards granted beginning in 2016). Prior to vesting, holders of PSU's do not have voting rights and are not entitled to receive dividends or dividend equivalents. Dividend equivalents are generally credited to holders of PSU's at the same rate as dividends are paid on our common stock (if and when such dividends are paid), but are only paid for PSU's that vest and become shares of our common stock. PSU's may not be sold, assigned, transferred, pledged or otherwise encumbered until they vest.

For the six months ended June 30, 2018, the Compensation Committee approved share-based payment awards with a total grant date fair value of $32.3 million, as follows:

• 283,019 PSU's with a grant date fair value of $13.2 million and a single vesting opportunity after a three-year service period. These PSU's provide the recipient with an opportunity to vest in incremental PSU's of up to 100% of the initial units awarded subject to the achievement of certain ROIC targets, for a total maximum vesting opportunity of 200% of the initial award. The maximum number of shares of common stock that may be payable with respect to these awards is 566,038.

• 402,899 RSU's with a grant date fair value of $19.1 million and annual vesting opportunities over a three-year service period.

Summary of Outstanding Share-Based Payment Awards—For the six months ended June 30, 2018, changes to the number of outstanding RSU’s, PSU’s, and restricted shares were as follows (shares in thousands):

	Restricted Shares, RSU's and PSU's		Weighted Average Grant Date Fair Value
Outstanding at January 1, 2018	1,922		$	36.59
Granted	686		$	47.06
Vested	(526	)	$	38.95
Canceled	(157	)	$	39.83
Outstanding at June 30, 2018	1,925		$	39.41

As of June 30, 2018, 6.2 million shares were available for future awards issued pursuant to the new Equity Plan. The aggregate fair value of RSU’s and PSU's that vested during the six months ended June 30, 2018 and 2017 was $26.8 million and $35.9 million, respectively, based on the closing stock price on the dates the shares vested.

Stock Options—Prior to the shareholder approval of the new Equity Plan on May 3, 2018, stock options were issued pursuant to the 1997 Stock Option Plan and were exercisable into authorized, but unissued shares of our common stock. These stock options vested evenly over four years and expired ten years after the date of grant. In the fourth quarter of 2017, the remaining 50,000 stock options that were outstanding under the 1997 Stock Option Plan were exercised at an exercise price of $22.11. As of June 30, 2018, there were no stock options outstanding or exercisable.

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Directors Stock Plan—Common stock is issued quarterly under the Sotheby’s Stock Compensation Plan for Non-Employee Directors (as amended and restated, the “Directors Stock Plan”). Directors may elect to receive this compensation in the form of deferred stock units, which are credited in an amount that is equal to the number of shares of common stock the director otherwise would have received. The number of shares of common stock awarded is calculated using the closing price of the common stock on the New York Stock Exchange on the business day immediately prior to the quarterly grant date. Deferred stock units are held until a director’s termination of service, at which time the units are settled on a one-for one basis in shares of our common stock on the first day of the calendar month following the date of termination. For the three months ended June 30, 2018 and 2017, we recognized $0.3 million within General and Administrative Expenses in our Condensed Consolidated Income Statements related to common stock shares awarded under the Directors Stock Plan. For the six months ended June 30, 2018 and 2017, such expense was $0.6 million and $0.5 million, respectively. As of June 30, 2018,171,165deferred stock units were outstanding under the Directors Stock Plan and 104,467units were available for future issuance.

20. Earnings Per Share

Basic earnings per share—Basic earnings per share attributable to Sotheby's common shareholders is computed under the two-class method using the weighted average number of common shares outstanding during the period. The two-class method requires that the amount of net income attributable to participating securities be deducted from consolidated net income in the computation of basic earnings per share. In periods with a net loss, the net loss attributable to participating securities is not deducted from consolidated net loss in the computation of basic loss per share as the impact would be anti-dilutive. Our participating securities include unvested restricted stock units and unvested restricted shares awarded to employees prior to May 3, 2018, both of which have non-forfeitable rights to dividends. See Note 19 for information on our share-based payment programs.

Diluted earnings per share—Diluted earnings per share attributable to Sotheby's common shareholders is computed in a similar manner to basic earnings per share under the two-class method, using the weighted average number of common shares outstanding during the period and, if dilutive, the weighted average number of potential common shares outstanding during the period. Our potential common shares principally include unvested performance share units held by employees and deferred stock units held by members of our Board of Directors. See Note 19 for information on our share-based payment programs.

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The table below summarizes the computation of basic and diluted earnings per share for the three and six months ended June 30, 2018 and 2017 (in thousands, except per share amounts):

	Three Months Ended June 30,				Six Months Ended June 30,
	2018		2017		2018		2017
Basic:
Numerator:
Net income attributable to Sotheby’s	$	57,282	$	76,891	$	50,760	$	65,566
Less: Net income attributable to participating securities	844		1,176		763		1,019
Net income attributable to Sotheby’s common shareholders	$	56,438	$	75,715	$	49,997	$	64,547
Denominator:
Weighted average common shares outstanding	51,780		52,716		52,122		52,866
Basic earnings per share - Sotheby’s common shareholders	$	1.09	$	1.44	$	0.96	$	1.22
Diluted:
Numerator:
Net income attributable to Sotheby’s	$	57,282	$	76,891	$	50,760	$	65,566
Less: Net income attributable to participating securities	844		1,176		763		1,019
Net income attributable to Sotheby’s common shareholders	$	56,438	$	75,715	$	49,997	$	64,547
Denominator:
Weighted average common shares outstanding	51,780		52,716		52,122		52,866
Weighted average effect of dilutive potential common shares:
Performance share units	259		151		197		293
Deferred stock units	171		159		172		157
Stock options	—		28		—		26
Weighted average dilutive potential common shares outstanding	430		338		369		476
Weighted average diluted shares outstanding	52,210		53,054		52,491		53,342
Diluted earnings per share - Sotheby’s common shareholders	$	1.08	$	1.43	$	0.95	$	1.21

For the three and six months ended June 30, 2018 and 2017, approximately 1 million potential common shares related to share-based payments were excluded from the computation of diluted loss per share because the financial performance or stock price targets inherent in such awards were not achieved as of the respective balance sheet dates.

21.Restructuring Charges

For the three and six months ended June 30, 2018, we recognized $2.1 million in Restructuring Charges for severance related costs attributable to the elimination of certain senior level positions.

22. Related Party Transactions

From time-to-time, in the ordinary course of business, related parties such as members of the Board of Directors and management, buy and sell property at our auctions or through private sales. For the three and six months ended June 30, 2018, our Condensed Consolidated Income Statements include Agency Commissions and Fees of $3.2 million and $3.4 million, respectively, attributable to transactions with related parties. For the six months ended June 30, 2018, our Condensed Consolidated Income Statements include Inventory Sales (and related cost of sales) of $5.3 million attributable to transactions with related parties. For the three and six months ended June 30, 2017, our Condensed Consolidated Income Statements include Agency Commissions and Fees of $1 million and $4.6 million attributable to transactions with related parties.

As of June 30, 2018, there was a related party receivable balance of $3.6 million. As of December 31, 2017 and June 30, 2017, there were no related party Accounts Receivable balances outstanding. As of June 30, 2018 and December 31, 2017, Client Payables included amounts owed to related party consignors totaling $0.4 million and $0.4 million, respectively. As of June 30, 2017, no amounts were owed to related party consignors.

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23. Recent Accounting Standards Not Yet Adopted

Leases—In February 2016, the FASB issued ASU 2016-02, Leases, which requires long-term lease arrangements to be recognized as assets and liabilities on the balance sheet of the lessee. Under ASU 2016-02, a right-of-use asset and lease obligation will be recorded for all long-term leases, whether operating or financing, while the statement of operations will reflect lease expense for operating leases and interest expense for financing leases. The amendments also require certain new quantitative and qualitative disclosures regarding leasing arrangements. ASU 2016-02 will be effective for us beginning on January 1, 2019. Our assessment of the impact of adopting ASU 2016-02 on our financial statements is ongoing. We have identified all material lease agreements and have chosen a lease management software solution to assist the adoption process.

Credit Losses—In June 2016, the FASB issued ASU 2016-13, Measurement of Credit Losses on Financial Instruments, which amends previously issued guidance regarding the impairment of financial instruments by creating an impairment model that is based on expected losses rather than incurred losses. ASU 2016-13 is effective for us beginning on January 1, 2020. We are currently assessing the potential impact of adopting ASU 2016-13 on our financial statements.

Goodwill—In January 2017, the FASB issued ASU 2017-04, Simplifying the Test for Goodwill Impairment, which eliminates the requirement to calculate the implied fair value of goodwill to measure a goodwill impairment charge. Instead, entities will record an impairment charge based on the excess of a reporting unit's carrying amount over its fair value. ASU 2017-04 is effective for us beginning on January 1, 2020. We do not expect the adoption of ASU 2017-04 to have a material impact on our financial statements.

Derivatives—In August 2017, the FASB issued ASU 2017-12, Derivatives and Hedging: Targeted Improvements to Accounting for Hedging Activities, which provides targeted guidance regarding the accounting for hedging activities to better align an entity’s risk management activities and financial reporting for hedging relationships through changes to both the designation and measurement guidance for qualifying hedging relationships and the presentation of hedge results. ASU 2017-12 is effective for us beginning on January 1, 2019. We are currently assessing the potential impact of adopting ASU 2017-12 on our financial statements.

Accumulated Comprehensive Income—On February 14, 2018, the FASB issued ASU 2018-02 to address industry concerns related to the application of ASC 740, Income Taxes, to certain provisions of the U.S. Tax Cuts and Jobs Act. Specifically, some constituents in the banking and insurance industries had expressed concerns about the requirement in ASC 740 that the effect of a change in tax laws or rates on deferred tax assets and liabilities be included in income from continuing operations in the reporting period that contains the enactment date of the change. That guidance applies even in situations in which the tax effects were initially recognized directly in other comprehensive income at the previous rate, resulting in stranded amounts in accumulated other comprehensive income ("AOCI") related to the income tax rate differential. Upon adopting ASU 2018-02, an entity is required to disclose:

• Its accounting policy related to releasing income tax effects from AOCI;

• Whether it has elected to reclassify, to retained earnings in the statement of stockholders’ equity, the stranded tax effects in AOCI related to the Act; and

• If it has elected to reclassify to retained earnings the stranded tax effects in AOCI related to the Act, what the reclassification encompasses (i.e., whether it only includes the change in the federal corporate tax rate or whether it also includes other changes resulting from the Act that affect AOCI).

The guidance in ASU 2018-02 is effective for fiscal years beginning after December 15, 2018, including interim periods therein. An entity will apply this guidance to each period in which the effect of the Act (or portion thereof) is recorded and may apply it either (1) retrospectively as of the date of enactment or (2) as of the beginning of the period of adoption. We are currently evaluating the potential impact of adopting ASU 2018-02 on our financial statements.

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ITEM 2:     MANAGEMENT'S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF

OPERATIONS

Management's Discussion and Analysis of Financial Condition and Results of Operations (or "MD&A") should be read in conjunction with Note 3 ("Segment Reporting") of Notes to Condensed Consolidated Financial Statements.

Sotheby's Business

Sotheby's offers collectors the opportunity to connect with and transact in the world's most extraordinary art and luxury goods, which in this report may collectively be referred to as "art," "works of art," "artwork," or "property." Auctioneers since 1744, today we present auctions in ten different salesrooms, including New York, London, Hong Kong and Paris. We also offer collectors a variety of innovative art-related services, including the brokerage of private art sales, private jewelry sales through Sotheby's Diamonds, exclusive private selling exhibitions, art-related financing, and art advisory services, as well as retail wine locations in New York and Hong Kong.

We are currently investing in technology to innovate and expand our traditional auction business, as well as to sharpen the differentiation between us and our competitors. These investments have provided tools to enhance our private sales capabilities, replaced our content management system, and implemented advanced client relationship management techniques. Looking to the future, additional technology investments are also being made to support online bidding and consignments, to develop our mobile capabilities, including innovations to client payments, user experience, security, and speed, and to enable a paperless auction room.

Through these investments, we have shown marked improvement in several key areas. Through the first six months of 2018, online sales totaled approximately $100 million, an increase of approximately 30% when compared to the same period in 2017. Additionally, through the first six months of 2018, approximately 25% of the items purchased at auction have been bought online, an increase of approximately 19% when compared to the same period in 2017, when approximately 21% of the items purchased at auction were bought online.

While our technology investments are facilitating the innovation and expansion of our traditional business, these investments have contributed to an overall increase in operating expenses across various categories in recent years, including to date in 2018.

Our operations are organized under two segments—the Agency segment and the Finance segment, which does business as and is referred to in this report as Sotheby’s Financial Services (“SFS”). The Agency segment earns commissions and feesby acting as agent for clients wishing to sell their artworks through the auction or private sale process. To a much lesser extent, the Agency segment also also earns revenues from the sale of artworks that are owned by Sotheby's. SFS earns interest income and associated fees through art-related financing activities by making loans that are secured by works of art. Art Agency, Partners (“AAP”), through which we offer art advisory services, provides art collectors with strategic guidance on collection identity and development, acquisitions, and short and long-term planning, and provides advice to artists and artists' estates. In addition, from time-to-time, AAP brokers private art sales for its advisory clients. Our advisory services are classified within All Other for segment reporting purposes, along with our retail wine business and brand licensing activities, and the results from certain equity method investments.

The global art market, like other asset classes, is influenced over time by the overall strength and stability of the global economy, the financial markets of various countries, geopolitical conditions, and world events. However, the global art market often moves independently and sometimes, counter to, general macroeconomic cycles. Ultimately, we believe that the level of activity and buoyancy of the global art market is most prominently impacted by the collective sentiment of art market participants, as well as the individual circumstances of potential sellers of art. For example, many major artworks are offered for sale only as a result of the death or financial or personal situations of the owner. In addition, in the wake of economic uncertainty, potential sellers may not be willing to offer their artworks for sale, and potential buyers may be less willing to purchase works of art. Also, in periods of market expansion, potential sellers may choose to not offer their artworks for sale in order to benefit from potential future price appreciation. Taken together, these factors cause the supply and demand for works of art to be unpredictable and may lead to significant variability in our revenues and earnings from period to period.

Competition in the global art market is intense. A fundamental challenge facing any auctioneer or art dealer is the sourcing of high quality and valuable property for sale either as agent or as principal. Our primary competitor in the global art market is Christie's, a privately owned auction house. To a lesser extent, we also face competition from a variety of art dealers across all collecting categories, as well as smaller auction houses such as Bonhams, Phillips, and certain regional auction houses. In the Chinese art market, the largest auction houses are Beijing Poly International Auction Co. Ltd., China Guardian Auctions Co. Ltd. and Beijing Hanhai Auction Co. Ltd.

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As noted above, we are a service business in which the ability of our employees to source high-value works of art and develop and maintain relationships with potential sellers and buyers of art is essential to our success. Our business is highly dependent upon attracting and retaining qualified personnel and employee compensation is our most substantial operating expense. We also incur significant costs to promote and conduct our auctions, as well as general and administrative expenses to support our global operations. While a large portion of our expenses are fixed, certain categories of expense are variable. For example, sale marketing costs are dependent upon the volume of auction activity and certain elements of employee compensation are a function of our financial performance.

Seasonality

The global art auction market has two principal selling seasons, which generally occur in the second and fourth quarters of the year. In the aggregate, second and fourth quarter Net Auction Sales¹ represented 80% and 82% of our total annual Net Auction Sales in 2017 and 2016, respectively, with auction commission revenues comprising approximately 66% and 75%, of our total revenues, respectively. Accordingly, our financial results are seasonal, with peak revenues and operating income generally occurring in the second and fourth quarters. Consequently, first and third quarter results have historically reflected lower revenues when compared to the second and fourth quarters and, typically, a net loss due to the fixed nature of many of our operating expenses.

In quarterly reporting periods, the comparison of our results between reporting periods can be significantly influenced by a number of factors, such as changes in the timing of when certain auctions occur, the level of non-recurring single-owner auction sale events, the level and timing of individually negotiated private sale transactions, and changes in certain accounting estimates that rely upon forecasted results such as variable incentive and share-based compensation expense and our estimated annual effective income tax rate. Accordingly, when evaluating our performance, we believe that investors should also consider results for rolling six and twelve month periods, which better reflect the business cycle of the global art auction market.

Business and Industry Trends

Following a period of expansion that began in late-2009 and lasted until the fourth quarter of 2015, the global art market entered a period of lower sales, particularly in the Impressionist, Modern and Contemporary Art collecting categories, which resulted in a 27% decrease in Consolidated Sales² in 2016, when compared to 2015. However, even during this period of lower sales, collectors continued to purchase top quality works of art for strong prices and our auction sell-through rates remained encouraging. In 2017, the art market strengthened, and we achieved a 12% increase in Consolidated Sales when compared to 2016, which led to a 10% increase in agency commissions and fees. In the first half of 2018, the art market continued to be strong, as evidenced by the 22% increase in Consolidated Sales and an 11% increase in agency commissions and fees when compared to the first half of 2017.

____________________________________

¹ Represents the total hammer (sale) price of property sold at auction, excluding amounts related to the sale of our inventory at auction, which are reported within inventory sales.

² Represents the sum of Aggregate Auction Sales, Private Sales, and inventory sales, as defined below.

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Consolidated Results of Operations for the Three and Six Months Ended June 30, 2018 and 2017

Overview—For the six months ended June 30, 2018, we reported net income of $50.8 million, representing a decrease of $14.8 million(23%), when compared to the same period in the prior year. After excluding certain items, Adjusted Net Income* for the six months ended June 30, 2018 decreased $3.1 million(5%) when compared to the prior year. During the first half of 2018, the art market continued to be strong as evidenced by a 22% increase in Consolidated Sales and associated increases in private sale commissions ($15.5 million / 55%) and auction commissions ($32.4 million / 9%). The increase in private sale commissions also reflects our continued focus of key resources towards this sale channel. However, results for the period were adversely impacted by a higher level of operating expenses, as well as an auction guarantee loss incurred on a single painting in the second quarter of 2018, for which there was no comparable loss in the prior year.

For the three months ended June 30, 2018, we reported net income of $57.3 million, representing a $19.6 million(26%) decrease when compared to the same period in the prior year. The comparison to the prior year is impacted by the change in timing of our spring Modern and Contemporary Art and Wine sales in Hong Kong, which were held in the first quarter of 2018 after occurring in the second quarter of 2017, and added $130 million in Net Auction Sales and $20 million in operating income to first quarter 2018 results. Also unfavorably impacting the comparison of quarter-to-date results to the prior year is an auction guarantee loss incurred on a single painting in the second quarter of 2018, for which there was no comparable loss in the prior year, as well as a higher level of operating expenses. Partially offsetting these factors is a 15% increase in Consolidated Sales, which, in part, led to a $9.2 million (62%) increase in private sale commissions.

For the three and six months ended June 30, 2018, Auction Commission Margin decreased from 16.3% to 14.1% and 16.7% to 15%, respectively. In the second quarter of 2018, the art market was driven by competitive high-value consignments from fiduciary sources such as estates, foundations and charities. Accordingly, when compared to the prior year periods, our Auction Commission Margin was reduced by a higher level of auction commissions shared with consignors in these situations. The comparison to the prior year periods was also negatively impacted by buyer's premium used to offset auction guarantee shortfalls and fees incurred in respect of auction guarantee risk sharing arrangements. In particular, the current year periods were negatively impacted by the sale of two guaranteed paintings, which collectively reduced our Auction Commission Margin by 1.4% and 1.1% during the three and six month periods, respectively.

Outlook—In general, the art market is strong, however, the demand at the high-end of the market for trophy works may be moderating as bidding for such lots in our second quarter auction sales appeared less robust than a year ago. Nonetheless, the second quarter of 2018 saw an enormous amount of property come to market and top-line results were encouraging, and we are cautiously optimistic as we head into the second half of the year.

We currently estimate that our effective income tax rate for 2018, excluding discrete items, will be in the range of 28% to 30%. We are still evaluating the effects of certain provisions of the U.S. Tax Cuts and Jobs Act ("the Act"), which could have an impact on our effective income tax rate in the future. As of June 30, 2018 based on our latest financial forecasts and current interpretation of the Act, we estimate our effective income tax rate for 2018 excluding discrete items to be approximately 30%.  This estimate is subject to further change due to various factors, including changes in our interpretation and/or assessment of Act provisions, additional interpretive guidance regarding the Act that may be issued in the future by the IRS and state taxing authorities, as well as changes to our financial forecasts and to projected jurisdictional mix of earnings in 2018.

(See statement on Forward Looking Statements.)

____________________________________

* See "Non-GAAP Financial Measures" below for a description of this non-GAAP financial measure and a reconciliation to the most comparable GAAP

amount.

43

Consolidated Financial Data Table—The following tables present a summary of our consolidated results of operations and related statistical metrics for the three and six months ended June 30, 2018 and 2017, as well as a comparison between the current and prior year periods (in thousands of dollars, except per share data):

							Variance
Three Months Ended June 30,	2018			2017			$ / %			%
Revenues:
Agency commissions and fees	$	290,879		$	301,768		$	(10,889	)	(4	%)
Inventory sales	40,106			19,937			20,169			*
Finance	9,641			13,359			(3,718		)	(28	%)
Other	5,010			4,795			215			4	%
Total revenues	345,636			339,859			5,777			2	%
Expenses:
Agency direct costs	59,449			54,842			4,607			8	%
Cost of inventory sales	42,414			22,255			20,159			91	%
Cost of finance revenues	1,793			5,078			(3,285		)	(65	%)
Marketing	6,276			5,951			325			5	%
Salaries and related (a)	96,718			88,540			8,178			9	%
General and administrative	45,671			43,362			2,309			5	%
Depreciation and amortization	7,343			5,676			1,667			29	%
Restructuring charges	2,146			—			2,146			N/A
Total expenses	261,810			225,704			36,106			16	%
Operating income	83,826			114,155			(30,329		)	(27	%)
Net interest expense (b)	(8,412		)	(7,205		)	(1,207		)	(17	%)
Write-off of credit facility fees	(3,982		)	—			(3,982		)	N/A
Non-operating income	2,449			944			1,505			*
Income before taxes	73,881			107,894			(34,013		)	(32	%)
Income tax expense	17,838			31,468			(13,630		)	(43	%)
Equity in earnings of investees	1,234			466			768			*
Net income	57,277			76,892			(19,615		)	(26	%)
Less: Net (loss) income attributable to noncontrolling interest	(5		)	1			(6		)	N/A
Net income attributable to Sotheby's	$	57,282		$	76,891		$	(19,609	)	(26	%)
Diluted earnings per share - Sotheby’s common shareholders	$	1.08		$	1.43		$	(0.35	)	(24	%)
Statistical Metrics:
Aggregate Auction Sales (c)	$	2,027,421		$	1,839,939		$	187,482		10	%
Net Auction Sales (d)	$	1,707,432		$	1,543,331		$	164,101		11	%
Private Sales (e)	$	296,060		$	189,027		$	107,033		57	%
Consolidated Sales (f)	$	2,363,587		$	2,048,903		$	314,684		15	%
Effective income tax rate	24.1		%	29.2		%	(5.1		%)	N/A
Non-GAAP Financial Measures:
Adjusted Expenses (g)	$	154,635		$	143,529		$	11,106		8	%
Adjusted Operating Income (g)	$	87,345		$	114,155		$	(26,810	)	(23	%)
Adjusted Net Income (g)	$	58,058		$	77,533		$	(19,475	)	(25	%)
Adjusted Diluted EPS (g)	$	1.09		$	1.44		$	(0.35	)	(24	%)
EBITDA (g)	$	90,875		$	121,240		$	(30,365	)	(25	%)
Adjusted EBITDA (g)	$	96,806		$	122,280		$	(25,474	)	(21	%)

44

							Variance
Six Months Ended June 30,	2018			2017			$ / %			%
Revenues:
Agency commissions and fees	$	456,405		$	413,033		$	43,372		11	%
Inventory sales	56,342			91,314			(34,972		)	(38	%)
Finance	19,522			26,126			(6,604		)	(25	%)
Other	9,163			8,695			468			5	%
Total revenues	541,432			539,168			2,264			—	%
Expenses:
Agency direct costs	94,722			76,131			18,591			24	%
Cost of inventory sales	58,409			93,662			(35,253		)	(38	%)
Cost of finance revenues	4,056			10,115			(6,059		)	(60	%)
Marketing	11,998			11,862			136			1	%
Salaries and related (a)	175,437			154,090			21,347			14	%
General and administrative	89,484			82,313			7,171			9	%
Depreciation and amortization	14,443			11,060			3,383			31	%
Voluntary separation incentive programs, net	—			(162		)	162			100	%
Restructuring charges	2,146			—			2,146			N/A
Total expenses	450,695			439,071			11,624			3	%
Operating income	90,737			100,097			(9,360		)	(9	%)
Net interest expense (b)	(17,360		)	(14,481		)	(2,879		)	(20	%)
Write-off of credit facility fees	(3,982		)	—			(3,982		)	N/A
Extinguishment of debt	(10,855		)	—			(10,855		)	N/A
Non-operating income	3,873			2,988			885			30	%
Income before taxes	62,413			88,604			(26,191		)	30	%
Income tax expense	13,702			24,176			(10,474		)	43	%
Equity in earnings of investees	2,040			1,133			907			80	%
Net income	50,751			65,561			(14,810		)	(23	%)
Less: Net loss attributable to noncontrolling interest	(9		)	(5		)	(4		)	(80	%)
Net income attributable to Sotheby's	$	50,760		$	65,566		$	(14,806	)	(23	%)
Diluted earnings per share - Sotheby’s common shareholders	$	0.95		$	1.21		$	(0.26	)	(21	%)
Statistical Metrics:
Aggregate Auction Sales (c)	$	2,854,211		$	2,407,229		$	446,982		19	%
Net Auction Sales (d)	$	2,398,801		$	2,018,234		$	380,567		19	%
Private Sales (e)	$	542,648		$	333,810		$	208,838		63	%
Consolidated Sales (f)	$	3,453,201		$	2,832,353		$	620,848		22	%
Effective income tax rate	22.0		%	27.3		%	(5.3		%)	N/A
Non-GAAP Financial Measures:
Adjusted Expenses (g)	$	285,614		$	259,325		$	26,289		10	%
Adjusted Operating Income (g)	$	98,631		$	99,935		$	(1,304	)	(1	%)
Adjusted Net Income (g)	$	63,013		$	66,109		$	(3,096	)	(5	%)
Adjusted Diluted EPS (g)	$	1.18		$	1.22		$	(0.04	)	(3	%)
EBITDA (g)	$	96,265		$	115,283		$	(19,018	)	(16	%)
Adjusted EBITDA (g)	$	115,873		$	116,161		$	(288	)	—	%

45

Legend:
*	Represents a variance in excess of 100%.
(a)	We do not allocate salaries and related costs to our cost of revenue, marketing expense, and general and administrative expense line items, as many employees often perform duties that could be categorized across more than one of these line items.
(b)	Represents interest expense principally attributable to long-term debt less interest income earned on deposits of cash and cash equivalents. Interest income earned from the SFS loan portfolio and any associated interest expense is reported within finance revenues and cost of finance revenues, respectively.
(c)	Represents the total hammer (sale) price of property sold at auction plus buyer’s premium, excluding amounts related to the sale of our inventory at auction, which are reported within inventory sales.
(d)	Represents the total hammer (sale) price of property sold at auction, excluding amounts related to the sale of our inventory at auction, which are reported within inventory sales.
(e)	Represents the total purchase price of property sold in private sales that we have brokered, including our commissions.
(f)	Represents the sum of Aggregate Auction Sales, Private Sales, and inventory sales.
(g)	See "Non-GAAP Financial Measures" below for a description of this non-GAAP financial measure and a reconciliation to the most comparable GAAP amount.

Separate discussions of Agency segment and SFS results for the three and six months ended June 30, 2018 and 2017, as well as a comparison of our indirect expenses between these periods, are presented in the captioned sections below.

Agency Segment

The following table presents a summary of Agency segment income before taxes and related statistical metrics, in thousands of dollars, for the three and six months ended June 30, 2018 and 2017. A detailed discussion of the significant factors impacting the comparison of Agency segment results between the current and prior year periods is presented below the table.

46

							Variance
Three Months Ended June 30,	2018			2017			$ / %			%
Revenues:
Auction commissions and fees:
Auction commissions (a)	$	257,799		$	266,949		$	(9,150	)	(3	%)
Auction related fees, net (a)	6,081			16,045			(9,964		)	(62	%)
Total Auction commissions and fees	263,880			282,994			(19,114		)	(7	%)
Private sale commissions (a)	24,016			14,827			9,189			62	%
Other Agency commissions and fees (a)	2,359			3,947			(1,588		)	(40	%)
Total Agency commissions and fees	290,255			301,768			(11,513		)	(4	%)
Inventory sales (a)	37,190			17,706			19,484			*
Total Agency segment revenues	327,445			319,474			7,971			2	%
Expenses:
Agency direct costs:
Auction direct costs	57,546			53,309			4,237			8	%
Private sale expenses	1,774			1,533			241			16	%
Intersegment costs (b)	2,182			3,003			(821		)	(27	%)
Total Agency direct costs	61,502			57,845			3,657			6	%
Cost of inventory sales (c)	40,274			20,671			19,603			95	%
Marketing	6,152			5,869			283			5	%
Salaries and related (d)	92,779			85,104			7,675			9	%
General and administrative	43,728			41,567			2,161			5	%
Depreciation and amortization	7,106			5,343			1,763			33	%
Restructuring charges	1,521			—			1,521			N/A
Total Agency segment expenses	253,062			216,399			36,663			17	%
Agency segment operating income	74,383			103,075			(28,692		)	(28	%)
Net interest expense (e)	(8,050		)	(6,843		)	(1,207		)	(18	%)
Write-off of credit facility fees (f)	(2,321		)	—			(2,321		)	N/A
Non-operating income	2,078			810			1,268			*
Equity in earnings of investees	1,083			184			899			*
Agency segment income before taxes	$	67,173		$	97,226		$	(30,053	)	(31	%)
Statistical Metrics:
Aggregate Auction Sales (g)	$	2,027,421		$	1,839,939		$	187,482		10	%
Net Auction Sales (h)	$	1,707,432		$	1,543,331		$	164,101		11	%
Items sold at auction with a hammer (sale) price greater than $1 million	231			229			2			1	%
Total hammer (sale) price of items sold at auction with a hammer price greater than $1 million	$	1,141,612		$	1,018,738		$	122,874		12	%
Items sold at auction with a hammer (sale) price greater than $3 million	83			76			7			9	%
Total hammer (sale) price of items sold at auction with a hammer price greater than $3 million	$	894,362		$	766,911		$	127,451		17	%
Auction Commission Margin (i)	14.1		%	16.3		%	(2.2		%)	N/A
Private Sales (j)	$	290,560		$	189,027		$	101,533		54	%
Consolidated Sales (k)	$	2,355,171		$	2,046,672		$	308,499		15	%
Non-GAAP Financial Measure:
Adjusted Agency Segment Income Before Taxes (l)	$	72,388		$	98,266		$	(25,878	)	(26	%)

47

							Variance
Six Months Ended June 30,	2018			2017			$ / %			%
Revenues:
Auction commissions and fees:
Auction commissions (a)	$	389,929		$	357,565		$	32,364		9	%
Auction related fees, net (a)	17,824			21,498			(3,674		)	(17	%)
Total Auction commissions and fees	407,753			379,063			28,690			8	%
Private sale commissions (a)	43,501			28,047			15,454			55	%
Other Agency commissions and fees (a)	4,351			5,923			(1,572		)	(27	%)
Total Agency commissions and fees	455,605			413,033			42,572			10	%
Inventory sales (a)	51,573			86,632			(35,059		)	(40	%)
Total Agency segment revenues	507,178			499,665			7,513			2	%
Expenses:
Agency direct costs:
Auction direct costs	90,565			73,525			17,040			23	%
Private sale expenses	3,888			2,606			1,282			49	%
Intersegment costs (b)	4,720			4,607			113			2	%
Total Agency direct costs	99,173			80,738			18,435			23	%
Cost of inventory sales (c)	54,948			90,310			(35,362		)	(39	%)
Marketing	11,777			11,667			110			1	%
Salaries and related (d)	168,402			148,239			20,163			14	%
General and administrative	85,588			78,910			6,678			8	%
Depreciation and amortization	13,977			10,480			3,497			33	%
Restructuring charges	1,521			—			1,521			N/A
Voluntary separation incentive programs, net	—			(148		)	148			100	%
Total Agency segment expenses	435,386			420,196			15,190			4	%
Agency segment operating income	71,792			79,469			(7,677		)	(10	%)
Net interest expense (e)	(16,603		)	(13,758		)	(2,845		)	(21	%)
Write-off of credit facility fees (f)	(2,321		)	—			(2,321		)	N/A
Non-operating income	3,445			2,751			694			25	%
Equity in earnings of investees	1,154			342			812			*
Agency segment income before taxes	$	57,467		$	68,804		$	(11,337	)	(16	%)
Statistical Metrics:
Aggregate Auction Sales (g)	$	2,854,211		$	2,407,229		$	446,982		19	%
Net Auction Sales (h)	$	2,398,801		$	2,018,234		$	380,567		19	%
Items sold at auction with a hammer (sale) price greater than $1 million	344			302			42			14	%
Total hammer (sale) price of items sold at auction with a hammer price greater than $1 million	$	1,555,895		$	1,360,459		$	195,436		14	%
Items sold at auction with a hammer (sale) price greater than $3 million	117			106			11			10	%
Total hammer (sale) price of items sold at auction with a hammer price greater than $3 million	$	1,173,732		$	1,035,643		$	138,089		13	%
Auction Commission Margin (i)	15.0		%	16.7		%	(1.7		%)	N/A
Private Sales (j)	537,148			333,810			$	203,338		61	%
Consolidated Sales (k)	$	3,442,932		$	2,827,671		$	615,261		22	%
Non-GAAP Financial Measure:
Adjusted Agency Segment Income Before Taxes (l)	$	67,057		$	69,696		$	(2,639	)	(4	%)

48

Legend:
*	Represents a change in excess of 100%.
(a)	See Note 4 of Notes to Condensed Consolidated Financial Statements for a description of each component of Agency segment revenues.
(b)	Principally includes fees charged to the Agency segment to compensate SFS for generating auction and private sale consignments through the sale of term loan collateral. In addition, this line item includes amounts charged by SFS for loans issued with favorable terms as an accommodation to the Agency segment in order to secure a consignment or enhance a client relationship.
(c)	Includes the net book value of inventory sold, commissions and fees paid to third parties who help facilitate the sale of inventory, and writedowns associated with our periodic assessment of inventory valuation.
(d)	We do not allocate salaries and related costs to our cost of revenue, marketing expense, and general and administrative expense line items, as many employees often perform duties that could be categorized across more than one of these line items.
(e)	Represents interest expense principally attributable to long-term debt less interest income earned on deposits of cash and cash equivalents. Interest income earned from the SFS loan portfolio and any associated interest expense is reported within finance revenues and cost of finance revenues, respectively. (See "Liquidity and Capital Resources" below for a discussion of a change to our capital structure that impacts how we fund the SFS loan portfolio.)
(f)	See "Write-off of Credit Facility Fees" below and Note 8 of Notes to Condensed Consolidated Financial Statements.
(g)	Represents the total hammer (sale) price of property sold at auction plus buyer's premium, excluding amounts related to the sale of our inventory at auction, which are reported within inventory sales.
(h)	Represents the total hammer (sale) price of property sold at auction, excluding amounts related to the sale of our inventory at auction, which are reported within inventory sales.
(i)	Represents total auction commissions, net of fees owed to the counterparties in auction guarantee risk sharing arrangements and fees owed to third parties who introduce us to auction consignors that are recorded within Auction direct costs, as a percentage of Net Auction Sales.
(j)	Represents the total purchase price of property sold in private sales that we have brokered, including our commissions. Because private sales are individually negotiated and non-recurring transactions, the volume and value of transactions completed can vary from period to period, with associated variability in revenues.
(k)	Represents the sum of Aggregate Auction Sales, Private Sales, and inventory sales attributable to the Agency segment.
(l)	See "Non-GAAP Financial Measures" below for a description of this non-GAAP financial measure and a reconciliation to the most comparable GAAP amount.

Auction Results—For the six months ended June 30, 2018, our net auction results (i.e., commissions and fees, net of related direct costs) improved $11.7 million (4%) principally due to a 19% increase in Net Auction Sales, partially offset by an auction guarantee loss incurred on a single painting in the second quarter of 2018, for which there was no comparable loss in the prior year.

For the three months ended June 30, 2018, our net auction results (i.e., commissions and fees, net of related direct costs) decreased $23.4 million (11%) due in part to a change in the timing of our spring Modern and Contemporary Art and Wine sales in Hong Kong, which were held in the first quarter of 2018 after occurring in the second quarter of 2017, and added $130 million in Net Auction Sales and $20 million in operating income to first quarter 2018 results. Also contributing to the lower level of auction results is an auction guarantee loss incurred on a single painting in the second quarter of 2018, for which there was no comparable loss in the prior year, partially offset by an 11% increase in Net Auction Sales.

(See the captioned sections below for a detailed discussion of Net Auction Sales and Auction Commission Margin.)

Net Auction Sales—For the three and six months ended June 30, 2018, Net Auction Sales increased $164.1 million (11%) and $380.6 million (19%), respectively, when compared to the prior year periods. These increases are largely due to a higher level of Impressionist and Modern Art, Contemporary Art, and Asian Art sales. The comparison of second quarter Net Auction Sales to the prior year is also impacted by the change in timing of our spring Modern and Contemporary Art and Wine sales in Hong Kong discussed above, which resulted in $130 million in Net Auction Sales in the first quarter of 2018.

49

Auction Commission Margin—Auction Commission Margin represents total auction commissions, net of fees owed to the counterparties in auction guarantee risk sharing arrangements and fees owed to third parties who introduce us to auction consignors, as a percentage of Net Auction Sales. Typically, Auction Commission Margin is higher for lower value works of art or collections, while higher valued property earns a lower Auction Commission Margin. Accordingly, Auction Commission Margin may be impacted by the mix of property sold in a period. Auction Commission Margin may also be adversely impacted by arrangements whereby we share our buyer's premium with a consignor in order to secure a competitive high-value consignment, as well as by our use of auction guarantees. For example, in situations when guaranteed property sells for less than the guaranteed price, our buyer's premium from that sale is used to reduce the loss on the transaction. See Note 18 of Notes to Condensed Consolidated Financial Statements for information related to our use of auction guarantees.

For the three and six months ended June 30, 2018, Auction Commission Margin decreased from 16.3% to 14.1% and 16.7% to 15%, respectively. In the second quarter of 2018, the art market was driven by competitive high-value consignments from fiduciary sources such as estates, foundations and charities. Accordingly, when compared to the prior year periods, our Auction Commission Margin was reduced by a higher level of auction commissions shared with consignors in these situations. The comparison to the prior year periods was also negatively impacted by buyer's premium used to offset auction guarantee shortfalls and fees incurred in respect of auction guarantee risk sharing arrangements. In particular, the current year periods were negatively impacted by the sale of two guaranteed paintings, which collectively reduced our Auction Commission Margin by 1.4% and 1.1% during the three and six month periods, respectively.

Private Sale Results—For the three and six months ended June 30, 2018, our net private sale results (i.e., commissions, net of related direct costs) increased $9.2 million (62%) and $15.5 million (55%), respectively, due to an increase in high-value transaction volume during the current year period, which reflects our continued focus of key resources towards this sales channel.

50

Sotheby's Financial Services

The following table presents a summary of SFS income before taxes and related loan portfolio metrics, in thousands of dollars, as of and for the three and six months ended June 30, 2018 and 2017:

							Variance
Three Months Ended June 30,	2018			2017			$ /%			%
Revenues:
Client paid revenues (a)	$	9,641		$	13,359		$	(3,718	)	(28	%)
Intersegment revenues (b)	2,182			3,003			(821		)	(27	%)
Total finance revenues	11,823			16,362			(4,539		)	(28	%)
Expenses:
Cost of finance revenues (c)	1,793			5,078			(3,285		)	(65	%)
Marketing	33			21			12			57	%
Salaries and related (d)	972			1,502			(530		)	(35	%)
General and administrative	506			720			(214		)	(30	%)
Depreciation and amortization	28			63			(35		)	(56	%)
Total SFS expenses	3,332			7,384			(4,052		)	(55	%)
SFS operating income	8,491			8,978			(487		)	(5	%)
Net interest expense (e)	(171		)	(239		)	68			28	%
Write-off of credit facility fees (f)	(1,661		)	—			(1,661		)	N/A
Non-operating income	232			140			92			66	%
SFS income before taxes	$	6,891		$	8,879		$	(1,988	)	(22	%)
Loan Portfolio Metrics:
Loan Portfolio Balance (g)	$	479,972		$	651,361		$	(171,389	)	(26	%)
Average Loan Portfolio (h)	$	492,193		$	651,203		$	(159,010	)	(24	%)
Finance Revenue Percentage (i)	9.6		%	10.1		%	(0.5		%)	N/A
Client Paid Interest Revenue Percentage (j)	7.2		%	7.5		%	(0.3		%)	N/A
Non-GAAP Financial Measure:
Adjusted SFS Income Before Taxes (k)	$	8,552		$	8,879		$	(327	)	(4	%)

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							Variance
Six Months Ended June 30,	2018			2017			$ /%			%
Revenues:
Client paid revenues (a)	$	19,522		$	26,126		$	(6,604	)	(25	%)
Intersegment revenues (b)	4,717			4,607			110			2	%
Total finance revenues	24,239			30,733			(6,494		)	(21	%)
Expenses:
Cost of finance revenues (c)	4,056			10,115			(6,059		)	(60	%)
Marketing	43			67			(24		)	(36	%)
Salaries and related (d)	2,018			2,557			(539		)	(21	%)
General and administrative	894			1,401			(507		)	(36	%)
Depreciation and amortization	61			126			(65		)	(52	%)
Total SFS expenses	7,072			14,266			(7,194		)	(50	%)
SFS operating income	17,167			16,467			700			4	%
Net interest expense (e)	(358		)	(476		)	118			25	%
Write-off of credit facility fees (f)	(1,661		)	—			(1,661		)	N/A
Non-operating income	254			221			33			15	%
SFS income before taxes	$	15,402		$	16,212		$	(810	)	(5	%)
Loan Portfolio Metrics:
Loan Portfolio Balance (g)	$	479,972		$	651,361		$	(171,389	)	(26	%)
Average Loan Portfolio (h)	$	524,353		$	661,178		$	(136,825	)	(21	%)
Finance Revenue Percentage (i)	9.2		%	9.3		%	(0.1		%)	N/A
Client Paid Interest Revenue Percentage (j)	6.7		%	7.2		%	(0.5		%)	N/A
Non-GAAP Financial Measure:
Adjusted SFS Income Before Taxes (k)	$	17,063		$	16,212		$	851		5	%

Legend:
(a)	Includes interest, facility fees, and collateral release fees earned from clients.
(b)	Principally includes fees charged to the Agency segment to compensate SFS for generating auction and private sale consignments through the sale of term loan collateral. In addition, this line item includes interest and fees earned from the Agency segment for loans issued with favorable terms as an accommodation to the Agency segment in order to secure a consignment or enhance a client relationship.
(c)	Includes borrowing costs related to the SFS Credit Facility, including interest expense, commitment fees, and the amortization of amendment and arrangement fees.
(d)	We do not allocate salaries and related costs to our cost of revenue, marketing expense, and general and administrative expense line items, as many of our employees perform duties that could be categorized across more than one of these line items.
(e)	Represents non-operating interest expense less non-operating interest income.
(f)	Represents the SFS portion of unamortized credit facility fees written off as a result of the refinancing of our credit facility in the second quarter of 2018. See "Write-off of Credit Facility Fees" below and Note 8 of Notes to Condensed Consolidated Financial Statements.
(g)	Represents the period end net loan portfolio balance.
(h)	Represents the average loan portfolio outstanding during the period.
(i)	Represents the annualized percentage of total client paid and intersegment finance revenues in relation to the Average Loan Portfolio.
(j)	Represents the annualized percentage of total client paid interest revenue in relation to the Average Loan Portfolio. For the six months ended June 30, 2017, SFS earned client paid interest of $1.1 million resulting from a retroactive interest rate adjustment triggered during those periods for which there was no comparable amount earned in the current year periods.
(k)	See "Non-GAAP Financial Measures" below for a description of this non-GAAP financial measure and a reconciliation to the most comparable GAAP amount.

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For the three and six months ended June 30, 2018, SFS income before taxes decreased by $2 million (22%) and $0.8 million (5%), respectively. The comparison of SFS results to the prior year periods is significantly impacted by a $1.7 million write-off of unamortized credit facility fees in the second quarter of 2018 as a result of the refinancing of our previous revolving credit facility.

Excluding the write-off of unamortized credit facility fees, for the three months ended June 30, 2018, Adjusted SFS Income Before Taxes* decreased by $0.3 million(4%) due to a 28% decrease in client paid revenues attributable to the 24% decrease in the Average Loan Portfolio. This decrease is the result of the settlement of certain client loans during the current year periods in response to higher LIBOR rates. The impact of the lower Average Loan Portfolio on second quarter results is largely offset by a decrease in interest costs following the reduction in revolving credit facility borrowings. In September 2017, we modified our cash management strategy whereby the SFS loan portfolio will no longer be directly funded with revolving credit facility borrowings. Subsequent to this change in our cash management strategy, we have steadily reduced our revolving credit facility borrowings and decreased the associated interest costs.

Excluding the write-off of unamortized credit facility fees, for the six months ended June 30, 2018, Adjusted SFS Income Before Taxes* increased by $0.9 million (5%) due to a decrease in interest costs following the reduction in revolving credit facility borrowings, as discussed above. The lower level of interest costs is partially offset by a 25% decrease in client paid revenues attributable to the 21% decrease in the Average Loan Portfolio.

(See "Write-off of Credit Facility Fees" and "Liquidity and Capital Resources" below and Note 8 of Notes to Condensed Consolidated Financial Statements.

____________________________________

* See "Non-GAAP Financial Measures" below for a description of this non-GAAP financial measure and a reconciliation to the most comparable GAAP

amount.

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Salaries and Related Costs

For the three and six months ended June 30, 2018 and 2017, salaries and related costs consisted of the following (in thousands of dollars):

						Variance
Three Months Ended June 30,	2018			2017		$			%
Full-time salaries	$	42,146		$	38,553	$	3,593		9	%
Incentive compensation expense	25,855			23,702		2,153			9	%
Employee benefits and payroll taxes	15,132			15,488		(356		)	(2	%)
Share-based payment expense	6,312			5,946		366			6	%
Contractual severance agreements	(197		)	—		(197		)	N/A
Other compensation expense (a)	7,470			4,851		2,619			54	%
Total salaries and related costs	$	96,718		$	88,540	$	8,178		9	%

					Variance
Six Months Ended June 30,	2018		2017		$		%
Full-time salaries	$	84,421	$	76,558	$	7,863	10	%
Incentive compensation expense	28,860		25,707		3,153		12	%
Employee benefits and payroll taxes	30,903		29,798		1,105		4	%
Share-based payment expense	14,689		12,015		2,674		22	%
Contractual severance agreements	2,625		—		2,625		N/A
Other compensation expense (a)	13,939		10,012		3,927		39	%
Total salaries and related costs	$	175,437	$	154,090	$	21,347	14	%

Legend:

(a) Other compensation expense typically includes the cost of temporary labor and overtime, as well as amortization expense related to certain retention-based, new-hire and other employment arrangements.

For the three and six months ended June 30, 2018, salaries and related costs increased $8.2 million (9%) and $21.3 million (14%), respectively, when compared to the same periods in the prior year. The comparison to the prior year is adversely impacted by changes in foreign currency exchange rates, which increased salaries and related costs by $2.1 million and $5.4 million, respectively. Excluding the impact of changes in foreign currency exchange rates, salaries and related costs increased $6.1 million (7%) and $15.9 million (10%) during the current three and six month periods, respectively. See below for a detailed discussion of the significant factors impacting the comparison of the various elements of salaries and related costs between the current and prior year periods.

Full-Time Salaries—For the three and six months ended June 30, 2018, full-time salaries increased $3.6 million (9%) and $7.9 million (10%), respectively, when compared to the same periods in the prior year. The comparison to the prior year is adversely impacted by changes in foreign currency exchange rates, which increased full-time salaries by $0.9 million and $2.6 million, respectively. Excluding the impact of changes in foreign currency exchange rates, salaries and related costs increased $2.7 million (7%) and $5.3 million (7%) during the current three and six month periods, respectively, principally due to headcount and base salary increases.

Incentive Compensation—Incentive compensation consists of the accrual for annual cash incentive bonuses, as well as amounts awarded to employees for brokering certain eligible private sale and other transactions. Payments made under the annual cash incentive bonus plan are aligned with performance against Sotheby's annual financial plan. The $2.2 million (9%) and $3.2 million (12%) increases in incentive compensation expense for the three and six months ended June 30, 2018, respectively, are due to the significant increase in private sales completed during the periods, which resulted in a higher level of associated incentive compensation expense.

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Share-Based Payment Expense—Share-based payment expense relates to the amortization of equity compensation awards such as performance share units, market-based share units, restricted stock units, and restricted shares. The amount of compensation expense recognized for share-based payments is based, in part, on our estimate of the number of units or shares ultimately expected to vest as a result of employee service. In addition, performance share units vest only if we achieve established profitability targets (for awards granted prior to 2016) or certain ROIC targets (for awards granted beginning in 2016). The amount of compensation expense recognized for such performance-based awards is dependent upon our quarterly assessment of the likelihood of achieving these future profitability or ROIC targets. If, as a result of our assessment, we project that a greater number of performance share units will vest than previously anticipated, a life-to-date adjustment to increase compensation expense is recorded in the period such determination is made. Conversely, if, as a result of our assessment, we project that a lower number of performance share units will vest than previously anticipated, a life-to-date adjustment to decrease compensation expense is recorded in the period such determination is made. See Note 19 of Notes to Condensed Consolidated Financial Statements for more detailed information related to our share-based compensation programs.

For the three and six months ended June 30, 2018, share-based payment expense increased $0.4 million (6%) and $2.7 million (22%), respectively, when compared to the prior year, principally reflecting an increase in our estimate of the number of performance share units ultimately expected to vest relative to the prior year.

Contractual Severance Agreements—For the six months ended June 30, 2018, we recorded net charges of $2.6 million resulting from contractual severance agreements entered into with certain former employees, which will allow us to redirect compensation towards the headcount supporting our various growth initiatives.

Other Compensation Expense—For the three and six months ended June 30, 2018, other compensation expense increased $2.6 million (54%) and $3.9 million (39%), respectively, when compared to the same periods in the prior year, primarily due to higher costs from retention-based, new-hire arrangements and temporary labor costs, especially with respect to various digital initiatives.

General and Administrative Expenses

General and administrative expenses include professional fees, facilities-related expenses, and travel and entertainment costs, as well as other indirect expenses. For the three and six months ended June 30, 2018, general and administrative expenses increased $2.3 million (5%) and $7.2 million (9%), respectively, when compared to the same periods in the prior year. The comparison to the prior year is adversely impacted by changes in foreign currency exchange rates, which increased general and administrative expenses by $0.8 million and $2.5 million, respectively. Excluding the impact of foreign currency exchange rate changes, general and administrative expenses increased $1.5 million (3%) and $4.7 million (6%) during the current three and six month periods, respectively. These increases are due to a higher level of legal claims and client goodwill gestures and the cost of off-site storage during the York Property enhancement project, as well as increased spending for digital initiatives and travel and entertainment. These factors are partially offset by professional fee recoveries realized in the second quarter of 2018 following the resolution of certain legal matters.

Depreciation and Amortization Expense

For the three and six months ended June 30, 2018, depreciation and amortization expense increased $1.7 million (29%) and $3.4 million (31%), predominantly due to accelerated depreciation charges associated with certain building improvements and other fixed assets that will be removed from service later in the year in connection with enhancements being made to our headquarters building at 1334 York Avenue in New York (the "York Property").

Restructuring Charges

For the three and six months ended June 30, 2018, we recognized $2.1 million in Restructuring Charges for severance related costs attributable to the elimination of certain senior level positions.

Net Interest Expense

For the three and six months ended June 30, 2018, net interest expense increased $1.2 million(17%) and $2.9 million(20%), respectively, when compared to the same periods in the prior year. These increases are primarily due to incremental interest expense associated with the refinancing of $300 million of 5.25% Senior Notes, due 2022, (the "2022 Notes") with proceeds from the issuance of $400 million of 4.875% Senior Notes, due 2025 (the "2025 Notes"). To a lesser extent, the increase is also due to a higher interest rate related to the York Property Mortgage following the expiration of an associated interest rate swap on July 1, 2017. (See "Extinguishment of Debt" below, as well as Note 8 and Note 9 of Notes to Condensed Consolidated Financial Statements.)

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Write-off of Credit Facility Fees

Prior to June 26, 2018, we were party to credit agreements with an international syndicate of lenders that, among other things, provided for dedicated asset-based revolving credit facilities for the Agency segment (the "Agency Credit Facility") and SFS (the "SFS Credit Facility") (collectively, the "Previous Credit Agreements"). On June 26, 2018, we refinanced the Previous Credit Agreements and entered into a new credit agreement with an international syndicate of lenders led by JPMorgan Chase Bank, N.A.As a result of this refinancing, $4 million of unamortized fees related to the Previous Credit Agreements were written off in the second quarter of 2018. See Note 8 of Notes to Condensed Consolidated Financial Statements.

Extinguishment of Debt

On December 12, 2017, we issued $400 million aggregate principal amount of 2025 Senior Notes. The net proceeds from the issuance of the 2025 Senior Notes were approximately $395.5 million, after deducting fees paid to the initial purchasers. On January 11, 2018, a significant portion of these proceeds were used to redeem $300 million aggregate principal amount of 2022 Senior Notes for a redemption price of $312.3 million, which included $4.4 million of accrued interest and a call premium of $7.9 million. As a result of the redemption of the 2022 Senior Notes, we wrote-off $3 million of related unamortized debt issuance costs, which, when combined with the $7.9 million call premium, resulted in a total loss on the extinguishment of debt of $10.9 million recognized in the first quarter of 2018.

Income Tax Expense

Our quarterly income tax provision is calculated using an estimated annual effective income tax rate ("ETR") based on actual historical information and forward looking estimates. Our estimated annual ETR may fluctuate due to changes in forecasted annual pre-tax income, changes in the jurisdictional mix of forecasted pre-tax income, and changes to actual or forecasted permanent book to tax differences (e.g., non-deductible expenses). Furthermore, our ETR may fluctuate as the result of changes to the valuation allowance for net deferred tax assets, the impact of future tax settlements with federal, state or foreign tax authorities, or the impact of tax law changes. We identify items that are unusual and non-recurring in nature and treat these as discrete events. The tax effect of these discrete events is booked entirely in the quarter in which they occur.

As of June 30, 2018, we estimate that our annual ETR, excluding discrete items, will be approximately 30%, as compared to our estimate of approximately 29% as of June 30, 2017. The comparison of our annual ETR to the prior year is significantly influenced by the U.S. Tax Cuts and Jobs Act (the “Act”), which was enacted into law on December 22, 2017 and includes many provisions that became effective on January 1, 2018. Certain provisions of the Act have the effect of reducing our annual estimated ETR, such as: (i) a reduction of the U.S. corporate income tax rate from 35% to 21% and (ii) the transition from a worldwide tax system to a modified territorial tax system, under which dividends from foreign subsidiaries are not subject to additional U.S. tax. Conversely, certain provisions of the Act have the effect of increasing our annual estimated ETR, such as: (i) the creation of global intangible low taxed income (“GILTI”), which requires income earned by foreign subsidiaries in excess of a nominal return on their depreciable assets to be included currently in the income of the U.S. shareholder, (ii) the imposition of the Base Erosion Anti-Abuse Tax (“BEAT”), a minimum tax on certain non-US related-party payments and (iii) more restrictive limitations on the deductibility of executive compensation. The increase in our annual estimated ETR as compared to the prior year is largely due to the effect of the the GILTI and BEAT provisions, which exceeds the impact of the reduction in the U.S. statutory tax rate. The estimated annual ETR of approximately 30% is higher than the U.S. federal statutory rate of 21% primarily as a result of state income taxes and the provisions of the Act related to GILTI, BEAT, and the deductibility of executive compensation. See Note 16 of Notes to Condensed Consolidated Financial Statements for additional information related to the Act.

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Our ETR for the three and six months ended June 30, 2018 was 24% and 22%, respectively, compared to an ETR of 29% and 27% for the same periods in 2017, respectively. Our lower ETR is primarily due to discrete income tax benefits of approximately $4.9 million recorded in the second quarter of 2018 to adjust the estimated income tax provision recorded in the fourth quarter of 2017 upon the enactment of the Act. These discrete income tax benefits include: (i) a $2.3 million reduction of the estimated income tax liability for the one-time mandatory transition tax on certain untaxed earnings of our foreign subsidiaries and (ii) a $2.6 million income tax benefit to adjust the remeasurement of our net deferred tax assets based on further analysis of available tax accounting methods and elections. The impact of these benefits was partially offset by the increase in our estimated annual ETR, as discussed above. Also impacting the comparison of the ETR for the six months ended June 30, 2018 to the prior year is a lower discrete income tax benefit related to the vesting of share-based payments and a discrete income tax benefit related to the loss on the extinguishment of debt, which was recorded at statutory income tax rates that are lower than our estimated annual ETR.

Impact of Changes in Foreign Currency Exchange Rates

For the three months ended June 30, 2018, changes in foreign currency exchange rates had a net unfavorable impact of ($0.3) million on our operating income, with revenues favorably impacted by $4.3 million, and expenses unfavorably impacted by $4.6 million. For the six months ended June 30, 2018, changes in foreign currency exchange rates had a net favorable impact of $1.2 million on our operating income, with revenues favorably impacted by $13.6 million, and expenses unfavorably impacted by $12.4 million. The net favorable impact for the six month period is the result of the weakening of the U.S. Dollar against the Pound Sterling and the Euro.

CASH FLOWS FOR THE SIX MONTHS ENDED JUNE 30, 2018 AND 2017

This discussion should be read in conjunction with Sotheby’s Condensed Consolidated Statements of Cash Flows for the six months ended June 30, 2018 and 2017. For the six months ended June 30, 2018, total cash, cash equivalents, and restricted cash decreased $445.1 million to $478.8 million, as compared to a decrease of $18.8 million to $575 million for the six months ended June 30, 2017. The significant factors impacting the comparisons between these periods are discussed below.

Net Cash Provided by Operating Activities—We are predominantly an agency business that collects and remits cash on behalf of our clients. Accordingly, the net amount of cash provided or used in a period by our operating activities is significantly influenced by the timing of auction and private sale settlements. As discussed in Note 4 of Notes to Condensed Consolidated Financial Statements, under our standard auction payment terms, the purchase price is due from the buyer no more than 30 days after the sale date, with the net proceeds due to the consignor 35 days after the sale date. Accordingly, it is not unusual for us to hold significant balances of consignor net sale proceeds at the end of a quarterly reporting period that are disbursed soon thereafter. Additionally, we sometimes provide extended payment terms to an auction or private sale buyer. For auctions, the extent to which extended payment terms are provided can vary considerably from selling season to selling season. In certain instances, and subject to management approval under our internal corporate governance policy, we may pay the net sale proceeds to the consignor before payment is collected from the buyer, with the collection from the buyer sometimes occurring after the current balance sheet date. The amount of net cash provided or used by our operating activities in a reporting period is also a function of our net income or loss, the timing of payments made to vendors, the timing of compensation-related payments, the timing and extent of cash flows related to inventory activities, and the timing of the collection and/or payment of tax-related receivables and payables.

For the six months ended June 30, 2018, net cash provided by operating activities of $16.8 million is principally due to our net income for the period ($50.8 million) and net cash inflows from inventory activities ($33.7 million). These cash inflows are partially offset by net cash outflows of $79.4 million associated with the settlement of auction and private sale transactions during the period and the funding of 2017 incentive compensation ($51.4 million).

For the six months ended June 30, 2017, net cash provided by operating activities of $54.3 million was principally attributable to our net income for the period ($65.6 million) and net cash inflows from inventory activities ($21 million). These cash inflows were partially offset by net cash outflows of $28.8 million associated with the settlement of auction and private sale transactions during the period, the funding of 2016 incentive compensation ($33.8 million), payments made in respect of the AAP earn-out arrangement ($8.75 million), and income tax payments ($35.7 million).

Net Cash Provided by Investing Activities—For the six months ended June 30, 2018, net cash provided by investing activities of $66 million is largely due to net collections of client loans ($94.6 million). This investing net cash inflow is partially offset by the funding of capital expenditures and acquisitions, as well as a realized net loss of $5.9 million from the settlement of derivative financial instruments designated as net investment hedges.

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For the six months ended June 30, 2017, net cash provided by investing activities of $44.9 million was largely due to a realized net gain of $29.1 million from the settlement of derivative financial instruments designated as net investment hedges and net collections of client loans ($23 million). These cash inflows were partially offset by capital expenditures of $8.4 million primarily for various office renovations. See Note 9 of Notes to Condensed Consolidated Financial Statements for additional information related to derivative financial instruments.

Net Cash Used by Financing Activities—For the six months ended June 30, 2018, net cash used by financing activities of $521.2 million is primarily due to the settlement of our $300 million 2022 Senior Notes, including the payment of a call premium of $7.9 million, and net repayments of revolver borrowings under our credit facility ($133.5 million), as well as common stock repurchases ($62.5 million).

For the six months ended June 30, 2017, net cash used by financing activities of $88.2 million was due to common stock repurchases ($33.9 million), net repayments of borrowings under our credit facility ($33.5 million), and the funding of employee tax obligations related to share-based payments ($14.6 million).

(See Note 8 of Notes to Condensed Consolidated Financial Statements for additional information regarding the refinancing of the 2022 Senior Notes.)

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CONTRACTUAL OBLIGATIONS AND COMMITMENTS

The following table summarizes our material contractual obligations and commitments as of June 30, 2018 (in thousands of dollars):

	Payments Due by Period
	Total		Less Than One Year		1 to 3 Years		3 to 5 Years		After 5 Years
Debt (a):
York Property Mortgage:
Principal payments	$	271,122	$	14,433	$	29,938	$	226,751	$	—
Interest payments	48,719		12,411		25,010		11,298		—
Sub-total	319,841		26,844		54,948		238,049		—
2025 Senior Notes
Principal payments	400,000		—		—		—		400,000
Interest payments	146,250		19,500		39,000		39,000		48,750
Sub-total	546,250		19,500		39,000		39,000		448,750
Revolving credit facility borrowings	63,000		63,000		—		—		—
Total debt and interest payments	929,091		109,344		93,948		277,049		448,750
Other commitments:
Operating lease obligations (b)	101,792		19,311		31,186		21,174		30,121
Compensation arrangements (c)	14,071		6,955		6,004		1,112		—
Acquisition earn-out consideration (d)	17,500		8,750		8,750		—		—
Auction guarantees (e)	31,200		31,200		—		—		—
Unfunded loan commitments (f)	50,173		50,173		—		—		—
Liability related to U.S. Tax Cuts and Jobs Act (g)	20,206		—		2,709		5,918		11,579
Uncertain tax positions (h)	—		—		—		—		—
Total other commitments	234,942		116,389		48,649		28,204		41,700
Total	$	1,164,033	$	225,733	$	142,597	$	305,253	$	490,450

(a) See Note 8 of Notes to Condensed Consolidated Financial Statements for information related to the York Property Mortgage, the 2025 Senior Notes, and our revolving credit facility. Sotheby's is party to a revolving credit facility that is scheduled to mature on June 26, 2023. The $63 million in borrowings outstanding under the credit facility as of June 30, 2018 were repaid in July 2018. The York Property Mortgage bears interest based on the one-month LIBOR rate plus a spread of 2.25%. We are party to an interest rate collar, which effectively fixes the LIBOR rate on the York Property Mortgage at an annual rate of no less than 1.917%, but no more than 3.75%. The table above assumes that the annual interest rate for the York Property Mortgage will be within the interest rate collar's floor and ceiling rates for the remainder of the mortgage term based on available forecasts of LIBOR rates for the future periods through maturity. The table above also assumes York Property Mortgage principal payments consistent with the related mortgage amortization schedule, as well as additional annual principal prepayments of $6.25 million each July beginning in 2018 and continuing through 2021. See Note 9 of Notes to Condensed Consolidated Financial Statements for additional information related to the interest rate collar.

(b) These amounts represent undiscounted future minimum rental commitments under non-cancellable operating leases.

(c) These amounts represent the remaining commitment for future salaries and other cash compensation related to compensation arrangements with certain senior employees, excluding any participation in our incentive compensation and share-based payment programs.

(d) In conjunction with the acquisition of AAP on January 11, 2016, we agreed to make future earn-out payments to the former principals of AAP not to exceed $35 million in the aggregate, contingent on the achievement of a level of cumulative financial performance within the Impressionist, Modern and Contemporary Art collecting categories, as well as from AAP's art advisory business. The cumulative financial performance target associated with this earn-out arrangement was achieved in the fourth quarter of 2016. The remaining $17.5 million owed under the earn-out arrangement will be paid in annual increments of $8.75 million in each of March 2019 and March 2020.

(e) This amount represents the minimum guaranteed price associated with auction guarantees outstanding as of June 30, 2018, net of amounts advanced, if any. See Note 18 of Notes to Condensed Consolidated Financial Statements for additional information related to auction guarantees.

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(f) Represents unfunded commitments to extend additional credit through SFS. See Note 5 of Notes to Condensed Consolidated Financial Statements for additional information related to the SFS loan portfolio.

(g) Represents the provisional income tax payable for the one-time mandatory transition tax on unremitted foreign earnings related to the U.S. Tax Cuts and Jobs Act. We intend to elect to settle this liability in installments over eight years, as allowed by the Act. See Note 16 of Notes to Condensed Consolidated Financial Statements.

(h) Excludes the $13.7 million liability recorded for uncertain tax positions that would be settled by cash payments to the respective taxing authorities, which are classified as long-term liabilities on our Condensed Consolidated Balance Sheets as of June 30, 2018. This liability is excluded from the table above because we are unable to make reliable estimates of the period of settlement with the various taxing authorities. See Note 17 of Notes to Condensed Consolidated Financial Statements.

OFF-BALANCE SHEET ARRANGEMENTS

For information related to off-balance sheet arrangements see: (i) Note 5 of Notes to Condensed Consolidated Financial Statements, which discusses unfunded SFS loan commitments; (ii) Note 15 of Notes to Condensed Consolidated Financial Statements, which discusses guarantees of collection; and (iii) Note 18 of Notes to Condensed Consolidated Financial Statements, which discusses auction guarantees.

DERIVATIVE FINANCIAL INSTRUMENTS

For information related to derivative financial instruments, see Note 9 of Notes to Condensed Consolidated Financial Statements.

CONTINGENCIES

For information related to contingencies see: (i) Note 5 of Notes to Condensed Consolidated Financial Statements, which discusses past due loans; (ii) Note 15 of Notes to Condensed Consolidated Financial Statements, which discusses legal and other tax contingencies; (iii) Note 17 of Notes to Condensed Consolidated Financial Statements, which discusses income tax contingencies; and (iv) Note 18 of Notes to Condensed Consolidated Financial Statements, which discusses auction guarantees.

UNCERTAIN TAX POSITIONS

For information related to uncertain tax positions, see Note 17 of Notes to Condensed Consolidated Financial Statements.

LIQUIDITY AND CAPITAL RESOURCES

Overview—As of June 30, 2018, we held cash and cash equivalents of $432.4 million, with $42.6 million held in the U.S. and $389.8 million held by our foreign subsidiaries (see “Repatriation of Foreign Earnings” below). After taking into account funds held that are owed to consignors, we estimate available cash balances to be approximately $175 million as of June 30, 2018. In addition to our available cash balances, we also have access to a revolving credit facility to support our various capital requirements. As of June 30, 2018, our revolving credit facility had a total available borrowing capacity of $592.2 million. (See Note 8 of Notes to Condensed Consolidated Financial Statements for information regarding the terms and conditions of our revolving credit facility.)

Our capital requirements include the liquidity necessary to support our recurring business needs, capital required for the pursuit of growth opportunities, and capital reserved to mitigate the risk of a cyclical downturn in the global art market. Importantly, the assessment of our capital requirements also takes into consideration the risks associated with our use of auction guarantees and their potential impact on our liquidity. We believe that our cash balances and available revolving credit facility borrowings provide an adequate level of capital to support our anticipated short and long-term commitments (as discussed in more detail below), operating needs and capital requirements.

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Repatriation of Foreign Earnings—On December 22, 2017, the U.S. Tax Cuts and Jobs Act (the "Act") was enacted into law. One provision of the Act required U.S. taxes to be paid on certain of our foreign earnings that had not been repatriated as of December 31, 2017. As a result, in the fourth quarter of 2017, we recorded a provisional tax liability of $40.4 million related to the one-time mandatory transition tax on approximately $460 million of foreign earnings that we had not yet repatriated. In the second quarter of 2018, we reduced our estimate of the one-time transition tax liability by $2.3 million to $38.1 million. Net of tax credits, other U.S. deductions, and payments made to date, the amount due as of June 30, 2018 is approximately $20.2 million. The taxes related to these earnings will be paid over eight years beginning in 2018. In 2018, we expect to repatriate approximately $365 million of these foreign earnings to the U.S., of which $285 million was repatriated in the first six months of 2018. (See statement on Forward Looking Statements. See Note 16 of Notes to the Condensed Consolidated Financial Statements for additional information of the effects of the Act.) 

Refinancing of Revolving Credit Facility—Prior to June 26, 2018, we were party to credit agreements with an international syndicate of lenders that, among other things, provided for dedicated asset-based revolving credit facilities for the Agency segment (the "Agency Credit Facility") and SFS (the "SFS Credit Facility") (collectively, the "Previous Credit Agreements"). On June 26, 2018, we refinanced the Previous Credit Agreements and entered into a new credit agreement with an international syndicate of lenders led by JPMorgan Chase Bank, N.A. (the “New Credit Agreement”). The New Credit Agreement combines the previous Agency Credit Facility and previous SFS Credit Facility into one asset-based revolving credit facility with an aggregate borrowing capacity of $1.1 billion, which is subject to an enhanced borrowing base.

Assessment of Liquidity and Capital Requirements—We generally rely on existing cash balances (including amounts collected on behalf of and owed to consignors), operating cash flows, and revolving credit facility borrowings, if needed, to meet our liquidity and capital requirements. The timing and extent of any revolving credit facility borrowings is dependent upon a number of factors including, but not limited to, the amount of available cash on hand, the cyclical nature of the global art market, the seasonality of the art auction market, the timing of auction and private sale settlements, the potential funding of auction guarantees, the demand for art-related financing, which can be significantly influenced by overall economic conditions and by the often unpredictable financial requirements of owners of major art collections, the timing of the funding of new client loans, the timing of the settlement of existing client loans, the pursuit of business opportunities and growth initiatives, and the timing of the repatriation of foreign earnings.

Our short-term and long-term operating needs and capital requirements include: (i) the funding of net sales proceeds to consignors when unmatched extended payment terms are granted to auction or private sale buyers (see Note 4 of Notes to Condensed Consolidated Financial Statements); (ii) the potential funding of auction guarantees (see Note 18 of Notes to Condensed Consolidated Financial Statements); (iii) the potential funding of client loans; (iv) the repayment of outstanding revolving credit facility borrowings, if any, (v) the potential repayment of other debt; (vi) the funding of capital expenditures, including approximately $40 million to $50 million related to the planned York Property enhancement program; (vii) the funding of other possible business initiatives and/or investments; (viii) the funding of any common stock repurchases (see Note 13 of Notes to Condensed Consolidated Financial Statements); and (ix) the funding of the other short-term and long-term commitments summarized in the table of contractual obligations and commitments above. (See statement on Forward Looking Statements.)

We believe that operating cash flows, existing cash balances, and revolving credit facility borrowings will be adequate to support our anticipated short and long-term commitments, operating needs and capital requirements through the June 23, 2023 expiration of our revolving credit facility. (See statement on Forward Looking Statements.)

RECENT ACCOUNTING STANDARDS NOT YET ADOPTED

See Note 23 of Notes to Condensed Consolidated Financial Statements for a discussion of recent accounting standards that have not yet been adopted.

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NON-GAAP FINANCIAL MEASURES

GAAP refers to generally accepted accounting principles in the United States of America. Included in this Form 10-Q are financial measures presented in accordance with GAAP and also on a non-GAAP basis. Non-GAAP financial measures are important supplemental measures used in our financial and operational decision making processes, for internal reporting, and as part of our forecasting and budgeting processes, as they provide helpful measures of our core operations. These measures allow us to view operating trends, perform analytical comparisons, and benchmark performance between periods. We also believe that these measures may be used by securities analysts, investors, financial institutions, and other interested parties in their evaluation of our performance. The non-GAAP financial measures presented in this Form 10-Q are:

(i)	Adjusted Expenses	(v)	Adjusted Net Income
(ii)	Adjusted Operating Income	(vi)	Adjusted Diluted Earnings Per Share ("Adjusted Diluted EPS")
(iii)	Adjusted Agency Segment Income Before Taxes	(vii)	EBITDA
(iv)	Adjusted SFS Income Before Taxes	(viii)	Adjusted EBITDA

To the extent applicable, these non-GAAP financial measures exclude the effect of the following unusual items, as detailed in the accompanying reconciliation tables below:

(i)	Charges (credits) related to contractual severance agreements entered into with certain former employees;
(ii)	Restructuring charges;
(iii)	Accelerated depreciation charges related to certain fixed assets that have been removed from service in connection with planned enhancements to the York Property;
(iv)	Net credits associated with a series of regional voluntary separation incentive programs that were implemented in 2015;
(v)	The loss incurred in connection with the extinguishment of our 2022 Senior Notes in the first quarter of 2018;
(vi)	The write-off of unamortized credit facility fees related to our previous credit agreement, which was refinanced in the second quarter of 2018;
(vii)	The charge resulting from the concurrent amendments to the York Property Mortgage and the related interest rate collar in the second quarter of 2017; and
(viii)	The net income tax benefit resulting from the U.S. Tax Cuts and Jobs Act.

Adjusted Expenses, as reconciled below, also excludes direct costs of revenues associated with our auction offerings, interest expense associated with the SFS loan portfolio, and the cost of inventory sales, all of which are variable in nature and can vary significantly from period-to-period. In the second quarter of 2018, we updated our definition of Adjusted Expenses to exclude agency direct costs as a result of the adoption of Accounting Standards Codification ("ASC") 606, Revenue from Contracts with Customers. As a result of the adoption of ASC 606, the following items previously reported on a net basis within revenues are now reported on a gross basis within agency direct costs: (i) fees owed to the counterparties in auction guarantee risk sharing arrangements and (ii) fees owed to third parties who introduce us to auction or private sale consignors. This change in presentation has added to the variability of our agency direct costs. Adjusted Expenses for the three and six months ended June 30, 2017 has been recast to reflect the retrospective adoption of ASC 606. (See Note 1 of Notes to Condensed Consolidated Financial Statements.)

We caution users of our financial statements that amounts presented in accordance these non-GAAP financial measures may not be comparable to similar measures disclosed by other companies because not all companies and analysts calculate such measures in the same manner.

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The following is a reconciliation of total expenses to Adjusted Expenses for the three and six months ended June 30, 2018 and 2017 (in thousands of dollars):

	Three Months Ended					Six Months Ended
	June 30,					June 30,
	2018			2017		2018		2017
Total expenses	$	261,810		$	225,704	$	450,695	$	439,071
Subtract: Agency direct costs	59,449			54,842		94,722		76,131
Subtract: Cost of inventory sales	42,414			22,255		58,409		93,662
Subtract: Cost of finance revenues	1,793			5,078		4,056		10,115
Subtract: Contractual severance agreement (credits) charges	(197		)	—		2,625		—
Subtract: Restructuring charges	2,146			—		2,146		—
Subtract: Accelerated depreciation charges	1,570			—		3,123
Subtract: Voluntary separation incentive program credits, net	—			—		—		(162		)
Adjusted Expenses	$	154,635		$	143,529	$	285,614	$	259,325

The following is a reconciliation of operating income to Adjusted Operating Income for the three and six months ended June 30, 2018 and 2017 (in thousands of dollars):

	Three Months Ended					Six Months Ended
	June 30,					June 30,
	2018			2017		2018		2017
Operating income	$	83,826		$	114,155	$	90,737	$	100,097
Add: Contractual severance agreement (credits) charges	(197		)	—		2,625		—
Add: Restructuring charges	2,146			—		2,146		—
Add: Accelerated depreciation charges	1,570			—		3,123
Add: Voluntary separation incentive program credits, net	—			—		—		(162		)
Adjusted Operating Income	$	87,345		$	114,155	$	98,631	$	99,935

The following is a reconciliation of Agency segment income before taxes to Adjusted Agency Segment Income Before Taxes for the three and six months ended June 30, 2018 and 2017 (in thousands of dollars):

	Three Months Ended					Six Months Ended
	June 30,					June 30,
	2018			2017		2018		2017
Agency segment income before taxes	$	67,173		$	97,226	$	57,467	$	68,804
Add: Contractual severance agreement (credits) charges	(197		)	—		2,625		—
Add: Restructuring charges	1,521			—		1,521		—
Add: Accelerated depreciation charges	1,570			—		3,123		—
Add: Voluntary separation incentive program credits, net	—			—		—		(148		)
Add: Write-off of credit facility fees	2,321			—		2,321		—
Add: Charge related to interest rate collar amendment	—			1,040		—		1,040
Adjusted Agency Segment Income Before Taxes	$	72,388		$	98,266	$	67,057	$	69,696

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The following is a reconciliation of SFS income before taxes to Adjusted SFS Income Before Taxes for the three and six months ended June 30, 2018 and 2017 (in thousands of dollars):

	Three Months Ended				Six Months Ended
	June 30,				June 30,
	2018		2017		2018		2017
SFS income before taxes	$	6,891	$	8,879	$	15,402	$	16,212
Add: Write-off of credit facility fees	1,661		—		1,661		—
Adjusted SFS Income Before Taxes	$	8,552	$	8,879	$	17,063	$	16,212

The following is a reconciliation of net income attributable to Sotheby's to Adjusted Net Income for the three and six months ended June 30, 2018 and 2017 (in thousands of dollars):

	Three Months Ended					Six Months Ended
	June 30,					June 30,
	2018			2017		2018		2017
Net income attributable to Sotheby's	$	57,282		$	76,891	$	50,760	$	65,566
Add: Contractual severance agreement (credits) charges, net of tax of $49, $0, ($627), and $0	(148		)	—		1,998		—
Add: Restructuring charges, net of tax of ($532), $0, ($532), and $0	1,614			—		1,614		—
Add: Accelerated depreciation charges, net of tax of ($390), $0, ($775), and $0	1,180			—		2,348		—
Add: Voluntary separation incentive programs credits (net), net of tax of $0, $0, $0, and $63	—			—		—		(99		)
Add: Extinguishment of debt, net of tax of $0, $0, ($2,692), and $0	—			—		8,163		—
Add: Write-off of credit facility fees, net of tax of ($922), $0, ($922), and $0	3,060			—		3,060		—
Add: Charge related to interest rate collar amendment, net of tax of $0, ($398), $0, and ($398)	—			642		—		642
Subtract: Net income tax benefit related to the U.S. Tax Cuts and Jobs Act	4,930			—		4,930		—
Adjusted Net Income	$	58,058		$	77,533	$	63,013	$	66,109

The income tax effect of each line item in the reconciliation of net income attributable to Sotheby's to Adjusted Net Income is computed using the relevant jurisdictional tax rate for that item.

The following is a reconciliation of diluted earnings per share to Adjusted Diluted EPS for the three and six months ended June 30, 2018 and 2017:

	Three Months Ended				Six Months Ended
	June 30,				June 30,
	2018		2017		2018		2017
Diluted earnings per share	$	1.08	$	1.43	$	0.95	$	1.21
Add: Contractual severance agreement (credits) charges, per share	—		—		0.04		—
Add: Restructuring charges, per share	0.03		—		0.03		—
Add: Accelerated depreciation charges, per share	0.02		—		0.04		—
Add: Voluntary separation incentive program credits (net), per share	—		—		—		—
Add: Extinguishment of debt, per share	—		—		0.15		—
Add: Write-off of credit facility fees, per share	0.06		—		0.06		—
Add: Charge related to interest rate collar amendment, per share	—		0.01		—		0.01
Subtract: Net income tax benefit related to the U.S. Tax Cuts and Jobs Act, per share	0.10		—		0.09		—
Adjusted Diluted EPS	$	1.09	$	1.44	$	1.18	$	1.22

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The following is a reconciliation of net income attributable to Sotheby's to EBITDA and Adjusted EBITDA for the three and six months ended June 30, 2018 and 2017 (in thousands of dollars):

	Three Months Ended					Six Months Ended
	June 30,					June 30,
	2018			2017		2018		2017
Net income attributable to Sotheby's	$	57,282		$	76,891	$	50,760	$	65,566
Add: Income tax expense	17,838			31,468		13,702		24,176
Subtract: Interest income	482			367		847		624
Add: Interest expense	8,894			7,572		18,207		15,105
Add: Depreciation and amortization	7,343			5,676		14,443		11,060
EBITDA	90,875			121,240		96,265		115,283
Add: Contractual severance agreement (credits) charges	(197		)	—		2,625		—
Add: Restructuring charges	2,146			—		2,146		—
Add: Voluntary separation program credits, net	—			—		—		(162		)
Add: Extinguishment of debt	—			—		10,855		—
Add: Write-off of credit facility fees	3,982			—		3,982		—
Add: Charge related to interest rate collar amendment	—			1,040		—		1,040
Adjusted EBITDA	$	96,806		$	122,280	$	115,873	$	116,161

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FORWARD LOOKING STATEMENTS

This Form 10-Q contains certain forward looking statements, as such term is defined in Section 21E of the Securities Exchange Act of 1934, as amended, relating to future events and the financial performance of Sotheby's. Such statements are only predictions and involve risks and uncertainties, resulting in the possibility that the actual events or performance will differ materially from such predictions. Major factors, which we believe could cause the actual results to differ materially from the predicted results in the “forward looking statements” include, but are not limited to:

• Changes in the global economy, the financial markets, and political conditions of various countries;

• A change in the level of competition in the global art market;

• Uncertainty regarding the amount and quality of property available for consignment;

• Changes in trends in the art market as to which collecting categories and artists are most sought after and in the collecting preferences of individual collectors;

• The unpredictable demand for art-related financing;

• Our ability to maintain strong relationships with art collectors;

• An adverse change in the financial health and/or creditworthiness of our clients;

• Our ability to retain key personnel;

• Our ability to successfully execute business plans and strategic initiatives;

• Our ability to accurately estimate the value of works of art held in inventory or as collateral for SFS loans, as well as those offered under an auction guarantee;

• An adverse change in the financial health and/or creditworthiness of the counterparties to our auction guarantee risk sharing arrangements;

• Changes in laws and regulations, including those related to income taxes and sales, use, value-added, and other indirect taxes;

• Changes in foreign currency exchange rates;

• Volatility in the share price of Sotheby's common stock; and

• The ability of Sotheby's and its third party service providers to adequately protect their information systems and the client, employee, and company data maintained in those systems.

See Part II, Item 1A, "Risk Factors."

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ITEM 3: QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK

We continually evaluate the market risk associated with our financial instruments in the normal course of our business. As of June 30, 2018, our material financial instruments include: (i) cash and cash equivalents; (ii) restricted cash; (iii) notes receivable; (iv) credit facility borrowings; (v) the York Property Mortgage; (vi) various derivative financial instruments, including an interest rate swap, an interest rate collar, and outstanding forward exchange contracts, as discussed in more detail below; and (vii) unsecured senior notes. See Note 5 of Notes to Condensed Consolidated Financial Statements for information related to notes receivable. See Note 8 of Notes to Condensed Consolidated Financial Statements for information related to credit facility borrowings, the York Property Mortgage, and unsecured senior notes. See Note 9 of Notes to Condensed Consolidated Financial Statements for information regarding our derivative financial instruments.

Interest Rate Risk—On July 1, 2015, we entered into a seven-year, $325 million mortgage loan to refinance the previous mortgage on the York Property. The York Property Mortgage bears interest based on the one-month LIBOR rate plus a spread of 2.25%. In connection with the York Property Mortgage, we entered into a five-year interest rate collar (the "Mortgage Collar"), effective as of July 1, 2017. The Mortgage Collar effectively fixes the LIBOR rate on the York Property Mortgage at an annual rate of no less than 1.917%, but no more than 3.75%. After taking into account the Mortgage Collar, the annual interest rate of the York Property Mortgage will be between a floor of 4.167% and a cap of 6% for its remaining seven-year term. As of June 30, 2018, the notional value of the Mortgage Collar was $271.1 million.

On November 21, 2016, we entered into a two-year interest rate swap agreement (the “SFS Swap”) to eliminate the variability in expected cash outflows associated with the one-month LIBOR indexed interest payments owed on $63 million of SFS Credit Facility borrowings. As of June 30, 2018, the notional value of the SFS Swap was $63 million.

We believe that the interest rate risk associated with our other financial instruments is minimal as a hypothetical 10% increase or decrease in interest rates is immaterial to our cash flow, earnings, and the fair value of our financial instruments.

We are exposed to credit-related risks in the event of nonperformance by the counterparties to the Mortgage Collar and the SFS Swap. We do not expect any of these counterparties to fail to meet their obligations, given their investment grade short-term credit ratings.

Foreign Currency Exchange Rate Risk—We utilize forward contracts to hedge cash flow exposures related to foreign currency exchange rate movements, which primarily arise from short-term foreign currency denominated intercompany balances and, to a much lesser extent, foreign currency denominated client payable balances, as well as foreign currency denominated auction guarantee obligations. Such forward exchange contracts are typically short-term with settlement dates less than six months from their inception. In addition, as discussed in more detail below, we regularly enter into foreign currency forward exchange contracts to hedge the net investments in our foreign subsidiaries. All derivative financial instruments are entered into by our global treasury function, which is responsible for monitoring and managing our exposure to foreign currency exchange rate movements. As of June 30, 2018, the notional value of outstanding forward exchange contracts used to hedge such cash flow exposures was 308.2 million.

As of June 30, 2018, our foreign subsidiaries held approximately $396.7 million in foreign currency denominated cash balances. A hypothetical 10% strengthening or weakening of the U.S. dollar relative to all other currencies would result in a decrease or increase in our cash flow of approximately $39.7 million related to such foreign currency balances.

We are exposed to variability in the U.S. Dollar equivalent of the net investments in our foreign subsidiaries and, by extension, the U.S. Dollar equivalent of any foreign earnings repatriated to the U.S. due to potential changes in foreign currency exchange rates. As a result, we regularly enter into foreign currency forward exchange contracts to hedge the net investments in our foreign subsidiaries from which we expect to repatriate earnings to the U.S. As of June 30, 2018, the aggregate notional value of our outstanding net investment hedge contracts was $56.3 million.

We are exposed to credit-related risks in the event of nonperformance by the counterparties to our outstanding forward exchange contracts. We do not expect any of these counterparties to fail to meet their obligations, given their investment grade short-term credit ratings.

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ITEM 4: CONTROLS AND PROCEDURES

Disclosure Controls and Procedures

As of June 30, 2018, the Company has carried out an evaluation, under the supervision and with the participation of the Company’s management, including the Company’s Chief Executive Officer and Chief Financial Officer, of the effectiveness of the Company’s disclosure controls and procedures. Based upon that evaluation, the Company’s Chief Executive Officer and Chief Financial Officer have concluded that the Company’s disclosure controls and procedures (as defined in Exchange Act Rule 13a-15(e)) were effective as of June 30, 2018.

Changes in Internal Control over Financial Reporting

There was no change in the Company’s internal control over financial reporting that occurred during the Company’s most recent fiscal quarter that has materially affected, or is reasonably likely to materially affect, the Company’s internal control over financial reporting.

PART II: OTHER INFORMATION

ITEM 1: LEGAL PROCEEDINGS

See Note 15 of Notes to Condensed Consolidated Financial Statements for information related to legal proceedings.

ITEM 1A: RISK FACTORS

There have been no changes to the Risk Factors described in Part 1, Item 1A “Risk Factors” in our Annual Report on Form 10-K for the fiscal year ended December 31, 2017. 

ITEM 2: UNREGISTERED SALES OF EQUITY SECURITIES AND USE OF PROCEEDS

Issuer Purchases of Equity Securities

The following table provides information regarding our common stock repurchase program for the three months ended June 30, 2018:

Period	Total number of shares purchased	Average price paid per share		Total number of shares purchased as part of publicly announced plans or programs	Approximate dollar value of shares that may yet be purchased under publicly announced plans or programs (a)
April 2018	421,650	$	51.94	421,650	$	148,491,242
May 2018	282,108	$	54.08	282,108	$	133,233,869
June 2018	—	$	—	—	$	133,233,869
Second Quarter 2018	703,758	$	52.80	703,758

(a) Represents the dollar value of shares that were available to be repurchased under our publicly announced share repurchase program at the end of each respective monthly period.

Management expects to continue to repurchase shares of common stock via open market purchases, purchases made pursuant to a Rule 10b5-1 plan, and/or accelerated share repurchase agreements, subject to the factors described below. The timing of further share repurchases and the actual amount purchased will depend on a variety of factors including the market price of our common stock, general market and economic conditions, securities law requirements, and other corporate considerations. Repurchases may continue to be made pursuant to plans intended to comply with Rule 10b5-1 under the Exchange Act, which allows us to purchase our shares during periods when we otherwise might be prevented from doing so under insider trading laws or because of self-imposed trading blackout periods. The repurchase authorization does not require the purchase of a specific number of shares and is subject to suspension or termination by our Board of Directors at any time.

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ITEM 4: MINE SAFETY DISCLOSURES

Not applicable.

69

ITEM 6: EXHIBITS

31.1 Certification of Chief Executive Officer pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.

31.2 Certification of Chief Financial Officer pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.

32.1 Certification of Chief Executive Officer pursuant to Section 906 of the Sarbanes-Oxley Act of 2002.

32.2 Certification of Chief Financial Officer pursuant to Section 906 of the Sarbanes-Oxley Act of 2002.

101.INS XBRL Instance Document.

101.SCH XBRL Taxonomy Extension Schema Document.

101.CAL XBRL Taxonomy Extension Calculation Linkbase Document.

101.DEF XBRL Taxonomy Extension Definition Linkbase Document.

101.LAB XBRL Taxonomy Extension Label Linkbase Document.

101.PRE XBRL Taxonomy Extension Presentation Linkbase Document.

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SIGNATURES

Pursuant to the requirements of Section 13 or 15(d) of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized.

SOTHEBY’S
By:	/s/ KEVIN M. DELANEY
	Kevin M. Delaney
	Senior Vice President, Controller and Chief Accounting Officer

Date: August 6, 2018

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EX-31.1

EXHIBIT 31.1

CERTIFICATION OF CHIEF EXECUTIVE OFFICER

PURSUANT TO SECTION 302 OF THE SARBANES-OXLEY ACT OF 2002

I, Thomas S. Smith, Jr., certify that:

(1) I have reviewed this Quarterly Report on Form 10-Q for the period ended June 30, 2018 of Sotheby’s;

(2) Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

(3) Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

(4) The registrant’s other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

(a) Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

(b) Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

(c) Evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

(d) Disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and

(5) The registrant’s other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant’s auditors and the audit committee of the registrant’s board of directors (or persons performing the equivalent functions):

(a) All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial information; and

(b) Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal control over financial reporting.

/s/ THOMAS S. SMITH, JR.

Thomas S. Smith, Jr.

President and Chief Executive Officer

Sotheby’s

August 6, 2018

EX-31.2

EXHIBIT 31.2

CERTIFICATION OF CHIEF FINANCIAL OFFICER

PURSUANT TO SECTION 302 OF THE SARBANES-OXLEY ACT OF 2002

I, Michael Goss, certify that:

(1) I have reviewed this Quarterly Report on Form 10-Q for the period ended June 30, 2018 of Sotheby’s;

(2) Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

(3) Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

(4) The registrant’s other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

(a) Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

(b) Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

(c) Evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

(d) Disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and

(5) The registrant’s other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant’s auditors and the audit committee of the registrant’s board of directors (or persons performing the equivalent functions):

(a) All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial information; and

(b) Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal control over financial reporting.

/s/ MICHAEL GOSS

Michael Goss

Executive Vice President and Chief Financial Officer

Sotheby’s

August 6, 2018

EX-32.1

EXHIBIT 32.1

CERTIFICATION OF CHIEF EXECUTIVE OFFICER

PURSUANT TO SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

In connection with the Quarterly Report of Sotheby’s on Form 10-Q for the period ended June 30, 2018 as filed with the Securities and Exchange Commission on the date hereof (the “Report”), I, Thomas S. Smith, Jr., certify, pursuant to 18 U.S.C. § 1350, as adopted pursuant to § 906 of the Sarbanes-Oxley Act of 2002, that, to my knowledge:

(1) The Report fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934; and

(2) The information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the registrant.

/s/ THOMAS S. SMITH, JR.

Thomas S. Smith, Jr.

President and Chief Executive Officer

Sotheby’s

August 6, 2018

EX-32.2

EXHIBIT 32.2

CERTIFICATION OF CHIEF FINANCIAL OFFICER

PURSUANT TO SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

In connection with the Quarterly Report of Sotheby’s on Form 10-Q for the period ended June 30, 2018 as filed with the Securities and Exchange Commission on the date hereof (the “Report”), I, Michael Goss, certify, pursuant to 18 U.S.C. § 1350, as adopted pursuant to § 906 of the Sarbanes-Oxley Act of 2002, that, to my knowledge:

(1) The Report fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934; and

(2) The information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the registrant.

/s/ MICHAEL GOSS

Michael Goss

Executive Vice President and Chief Financial Officer

Sotheby’s

August 6, 2018

XML

Document and Entity Information - shares	6 Months Ended
	Jun. 30, 2018	Aug. 01, 2018
Document And Entity Information [Abstract]
Entity Registrant Name	SOTHEBYS
Entity Central Index Key	0000823094
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Document Type	10-Q
Document Period End Date	Jun. 30, 2018
Document Fiscal Year Focus	2018
Document Fiscal Period Focus	Q2
Amendment Flag	false
Entity Common Stock, Shares Outstanding		51,613,426

XML

CONDENSED CONSOLIDATED INCOME STATEMENTS (UNAUDITED) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Revenues:
Agency commissions and fees	$ 290,879	$ 301,768	$ 456,405	$ 413,033
Inventory sales	40,106	19,937	56,342	91,314
Finance	9,641	13,359	19,522	26,126
Other	5,010	4,795	9,163	8,695
Total revenues	345,636	339,859	541,432	539,168
Expenses:
Agency direct costs	59,449	54,842	94,722	76,131
Cost of inventory sales	42,414	22,255	58,409	93,662
Cost of finance revenues	1,793	5,078	4,056	10,115
Marketing	6,276	5,951	11,998	11,862
Salaries and related	96,718	88,540	175,437	154,090
General and administrative	45,671	43,362	89,484	82,313
Depreciation and amortization	7,343	5,676	14,443	11,060
Voluntary separation incentive programs, net	0	0	0	(162)
Restructuring charges	2,146	0	2,146	0
Total expenses	261,810	225,704	450,695	439,071
Operating income	83,826	114,155	90,737	100,097
Interest income	482	367	847	624
Interest expense	(8,894)	(7,572)	(18,207)	(15,105)
Write-off of credit facility fees	(3,982)	0	(3,982)	0
Extinguishment of debt	0	0	(10,855)	0
Non-operating income	2,449	944	3,873	2,988
Income before taxes	73,881	107,894	62,413	88,604
Income tax expense	17,838	31,468	13,702	24,176
Equity in earnings of investees	1,234	466	2,040	1,133
Net income	57,277	76,892	50,751	65,561
Less: Net (loss) income attributable to noncontrolling interest	(5)	1	(9)	(5)
Net income attributable to Sotheby's	$ 57,282	$ 76,891	$ 50,760	$ 65,566
Basic earnings per share - Sotheby’s common shareholders (USD per share)	$ 1.09	$ 1.44	$ 0.96	$ 1.22
Diluted earnings per share - Sotheby's common shareholders (USD per share)	$ 1.08	$ 1.43	$ 0.95	$ 1.21
Weighted average basic shares outstanding (shares)	51,780	52,716	52,122	52,866
Weighted average diluted shares outstanding (shares)	52,210	53,054	52,491	53,342

XML

CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (UNAUDITED) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Net income	$ 57,277	$ 76,892	$ 50,751	$ 65,561
Other comprehensive (loss) income:
Currency translation adjustments	(14,206)	5,955	(7,006)	8,351
Defined benefit pension plan	81	215	163	423
Total other comprehensive (loss) income	(10,639)	4,754	(3,797)	7,572
Comprehensive income	46,638	81,646	46,954	73,133
Less: Comprehensive income (loss) attributable to noncontrolling interests	(5)	1	(9)	(5)
Comprehensive income attributable to Sotheby's	46,643	81,645	46,963	73,138
Cash flow hedges
Other comprehensive (loss) income:
Hedges	136	38	1,306	876
Net investment hedges
Other comprehensive (loss) income:
Hedges	$ 3,350	$ (1,454)	$ 1,740	$ (2,078)

XML

CONDENSED CONSOLIDATED BALANCE SHEETS (UNAUDITED) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017	Jun. 30, 2017
Current assets:
Cash and cash equivalents	$ 432,357	$ 544,432	$ 516,402
Restricted cash (see Notes 8 and 11)	28,979	361,578	41,258
Accounts receivable, net of allowance for doubtful accounts of $9,667, $8,722, and $7,744	1,088,569	795,239	847,332
Notes receivable, net of allowance for credit losses of $1,132, $1,253, and $1,290	92,770	87,746	73,217
Inventory	32,639	74,483	131,193
Income tax receivables	18,051	6,601	14,825
Prepaid expenses and other current assets (see Note 11)	43,262	32,010	45,455
Total current assets	1,736,627	1,902,089	1,669,682
Notes receivable, net of allowance for credit losses of $1,525, $1,525, and $0	390,507	507,538	559,605
Fixed assets, net of accumulated depreciation and amortization of $239,705, $229,751, and $218,870	356,162	352,035	347,067
Goodwill	55,670	50,547	50,351
Intangible assets, net	14,613	11,492	12,407
Income tax receivables	327	324	434
Deferred income taxes	27,948	35,674	7,837
Other long-term assets (see Note 11)	229,813	227,608	192,995
Total assets	2,811,667	3,087,307	2,840,378
Current liabilities:
Client payables	1,191,581	996,197	867,856
Accounts payable and accrued liabilities	104,608	90,298	91,196
Accrued salaries and related costs	62,160	94,310	54,733
Current portion of long-term debt, net	13,423	308,932	38,825
Accrued income taxes	23,012	8,127	21,180
Other current liabilities (see Note 10)	11,785	18,762	46,211
Total current liabilities	1,406,569	1,516,626	1,120,001
Credit facility borrowings	63,000	196,500	531,500
Long-term debt, net	648,411	653,003	563,762
Accrued income taxes	26,737	37,651	18,315
Deferred income taxes	14,035	15,163	11,800
Other long-term liabilities (see Note 11)	46,171	51,424	51,857
Total liabilities	2,204,923	2,470,367	2,297,235
Commitments and contingencies (see Note 15)
Shareholders’ equity:
Common stock, $0.01 par value, Authorized shares — 200,000,000, Issued shares —70,777,023; 70,378,873; and 70,373,836, Outstanding shares —52,503,235; 52,971,232; and 55,017,175	711	709	708
Additional paid-in capital	458,712	453,364	442,560
Treasury stock shares, at cost — 19,560,792; 18,368,188; and 18,147,641	(617,048)	(554,551)	(543,995)
Retained earnings	830,459	779,699	726,469
Accumulated other comprehensive loss	(66,263)	(62,466)	(82,786)
Total shareholders’ equity	606,571	616,755	542,956
Noncontrolling interest	173	185	187
Total equity	606,744	616,940	543,143
Total liabilities and shareholders’ equity	$ 2,811,667	$ 3,087,307	$ 2,840,378

XML

CONDENSED CONSOLIDATED BALANCE SHEETS (UNAUDITED) (Parenthetical) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017	Jun. 30, 2017
Statement of Financial Position [Abstract]
Allowance for doubtful accounts	$ 9,667	$ 8,722	$ 7,744
Allowance for credit losses	1,132	1,253	1,290
Allowance for Notes, Loans and Financing Receivable, Noncurrent	1,525	1,525	0
Accumulated depreciation and amortization	$ 239,705	$ 229,751	$ 218,870
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01	$ 0.01
Authorized shares (in shares)	200,000,000	200,000,000	200,000,000
Issued shares (in shares)	71,173,857	70,830,184	70,817,787
Outstanding shares (in shares)	51,613,065	52,461,996	52,670,146
Treasury stock shares (in shares)	19,560,792	18,368,188	18,147,641

XML

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Operating Activities:
Net income attributable to Sotheby's	$ 50,760	$ 65,566
Adjustments to reconcile net income attributable to Sotheby's to net cash provided by operating activities:
Extinguishment of debt	10,855	0
Write-off of credit facility fees	3,982	0
Depreciation and amortization	14,443	11,060
Deferred income tax expense	2,873	11,551
Share-based payments	14,689	12,015
Net pension benefit	(1,626)	(2,447)
Inventory writedowns and bad debt provisions	8,106	7,470
Amortization of debt issuance costs	877	827
Equity in earnings of investees	(2,040)	(1,133)
Other	947	453
Changes in assets and liabilities:
Accounts receivable	(285,172)	(359,192)
Client payables	205,791	330,368
Inventory	33,680	21,026
Changes in other operating assets and liabilities (see Note 12)	(41,370)	(43,307)
Net cash provided by operating activities	16,795	54,257
Investing Activities:
Funding of notes receivable	(66,608)	(101,896)
Collections of notes receivable	161,192	124,879
Capital expenditures	(19,075)	(8,420)
Acquisitions, net of cash acquired	(5,702)	0
Funding of investments	(64)	(5,537)
Distributions from investees	2,179	2,550
Proceeds from the sale of equity investment	0	2,110
Proceeds from company-owned life insurance	0	2,100
Settlement of net investment hedges	(5,921)	29,110
Net cash provided by investing activities	66,001	44,896
Financing Activities:
Proceeds from credit facility borrowings	108,000	28,500
Repayments of credit facility borrowings	(241,500)	(62,000)
Repayments of York Property Mortgage	(3,978)	(3,810)
Settlement of 2022 Senior Notes, including call premium	(307,875)	0
Debt issuance and other borrowing costs	(3,457)	(23)
Repurchases of common stock	(62,497)	(33,940)
Dividends paid	0	(2,375)
Funding of employee tax obligations upon the vesting of share-based payments	(9,903)	(14,573)
Net cash used by financing activities	(521,210)	(88,221)
Effect of exchange rate changes on cash, cash equivalents, and restricted cash	(6,734)	7,859
(Decrease) increase in cash, cash equivalents, and restricted cash	(445,148)	18,791
Cash, cash equivalents, and restricted cash at beginning of period	923,926	556,201
Cash, cash equivalents, and restricted cash at end of period	$ 478,778	$ 574,992

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Basis of Presentation

6 Months Ended

Jun. 30, 2018

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Basis of Presentation

Basis of Presentation

Company Overview—Sotheby's (or the "Company") offers collectors the opportunity to connect with and transact in the world's most extraordinary art and luxury goods, which in this report may collectively be referred to as "art," "works of art," "artwork," or "property." Auctioneers since 1744, today we present auctions in ten different salesrooms, including New York, London, Hong Kong and Paris. We also offer collectors a variety of innovative art-related services, including the brokerage of private art sales, private jewelry sales through Sotheby's Diamonds, exclusive private selling exhibitions, art-related financing, and art advisory services, as well as retail wine locations in New York and Hong Kong.

Accounting Principles—The unaudited Condensed Consolidated Financial Statements included herein have been prepared by the management of Sotheby’s in accordance with accounting principles generally accepted in the United States of America ("U.S. GAAP") and pursuant to the rules and regulations of the Securities and Exchange Commission (the "SEC"). Certain information and footnote disclosures normally included in financial statements prepared in accordance with U.S. GAAP have been condensed or omitted from this report, as is permitted by such rules and regulations. In our opinion, the unaudited Condensed Consolidated Financial Statements reflect all adjustments of a normal recurring nature that are necessary for a fair presentation of the results for the interim periods presented. The interim results presented in our Condensed Consolidated Income Statements are not necessarily indicative of results for a full year. See Note 2 for information about the seasonality of our business. We urge you to read these unaudited Condensed Consolidated Financial Statements in conjunction with the information included in our 2017 Form 10-K filed with the SEC on March 1, 2018.

Principles of Consolidation—The unaudited Condensed Consolidated Financial Statements include the accounts of our wholly-owned subsidiaries and Sotheby's (Beijing) Auction Co., Ltd. ("Sotheby's Beijing"), a joint venture in which we have a controlling 80% ownership interest. The net loss attributable to the minority owner of Sotheby's Beijing is reported as "Net Loss (Income) Attributable to Noncontrolling Interest" in our Condensed Consolidated Income Statements, and the non-controlling 20% ownership interest is reported as "Noncontrolling Interest" within the Equity section of our Condensed Consolidated Balance Sheets. Intercompany transactions and balances among our subsidiaries are eliminated in consolidation.

Equity investments through which we may significantly influence, but not control, the investee, are accounted for using the equity method. Under the equity method, our share of investee earnings or losses is recorded in our Condensed Consolidated Income Statements within Equity in Earnings of Investees. Our interest in the net assets of these investees is recorded on our Condensed Consolidated Balance Sheets within Other Long-Term Assets. Our equity method investees include: (i) Acquavella Modern Art ("AMA"), a partnership through which a collection of fine art is being sold, (ii) RM Sotheby's, an auction house for investment-quality automobiles, and (iii) a partnership formed in the second quarter of 2017 through which artworks are being purchased and sold.

Estimates and Assumptions—The preparation of financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates.

Revenue Recognition—In May 2014, the Financial Accounting Standards Board (the "FASB") issued an Accounting Standards Update ("ASU") which amends revenue recognition guidance and requires more detailed disclosures to enable users of financial statements to understand the nature, amount, timing, and uncertainty of revenue and cash flows arising from contracts with customers. This ASU is codified in U.S. GAAP under Accounting Standards Codification ("ASC") 606, Revenue from Contracts with Customers.

We adopted ASC 606 on January 1, 2018 using the full retrospective method. The adoption of ASC 606 did not impact the timing of our revenue recognition, but it changed the presentation of certain revenues and expenses previously reported on a net basis in our Condensed Consolidated Income Statements. Specifically, the following items previously reported on a net basis within Agency Commissions and Fees are now reported on a gross basis within Agency Direct Costs: (i) fees owed to the counterparties in auction guarantee risk sharing arrangements and (ii) fees owed to third parties who introduce us to auction or private sale consignors. In addition, consignor expense recoveries and buyer shipping fees previously reported on a net basis within Agency Direct Costs are now reported on a gross basis within Agency Commission and Fees. The table below under "Summary of Adjustments to Prior Period Presentation" shows the impact of the retrospective adoption of ASC 606 on our Condensed Consolidated Income Statements for the three and six months ended June 30, 2017.

Statement of Cash Flows—In August 2016, the FASB issued ASU 2016-15, Statement of Cash Flows, which updated the guidance on how certain cash receipts and cash payments should be presented and classified within the statement of cash flows. We retrospectively adopted ASU 2016-15 on January 1, 2018. The adoption of ASU 2016-15 changed how we classify cash proceeds received from our investment in company-owned life insurance ("COLI"), which is held in a rabbi trust and used to fund certain deferred compensation liabilities. Prior to the adoption of ASU 2016-15, COLI proceeds were classified as cash inflows from operating activities, but are now classified as cash inflows from investing activities. The adoption of ASU 2016-15 also required us to make certain accounting policy elections with respect to the statement of cash flows. First, ASU 2016-15 clarifies that COLI premiums paid may be classified as cash outflows from operating or investing activities, or a combination of both. In connection with the adoption of ASU 2016-15, we made an accounting policy election to classify COLI premiums paid as cash outflows from operating activities, consistent with our previous presentation of such payments. Second, ASU 2016-15 allows distributions received from equity method investees to be classified using either the cumulative earnings approach or the nature of distribution approach. In connection with the adoption of ASU 2016-15, we made an accounting policy election to classify distributions received from equity method investees using the cumulative earnings approach, consistent with our previous presentation of such distributions. The other aspects of ASU 2016-15 did not result in a change to our existing accounting policies for the preparation of the statement of cash flows. The table below under "Summary of Adjustments to Prior Period Presentation" shows the impact of our retrospective adoption of ASU 2016-15 on our Condensed Consolidated Statements of Cash Flows for the six months ended June 30, 2017.

In November 2016, the FASB issued ASU 2016-18, Statement of Cash Flows, to add and clarify guidance on the classification and presentation of restricted cash and restricted cash equivalents in the statement of cash flows. In particular, ASU 2016-18 requires that restricted cash and restricted cash equivalents be included within cash and cash equivalents when reconciling the beginning-of-period and end-of-period totals disclosed in the statement of cash flows. Transfers between restricted and unrestricted cash accounts are not to be reported within the statement of cash flows. Only restricted cash receipts or payments directly with third parties are to be reported in the statement of cash flows as either an operating, investing, or financing activity, depending on the nature of the transaction. We retrospectively adopted ASU 2016-18 on January 1, 2018. The table below under "Summary of Adjustments to Prior Period Presentation" shows the impact of our retrospective adoption of ASU 2016-18 on our Condensed Consolidated Statements of Cash Flows for the six months ended June 30, 2017. (See Note 11 for information related to our restricted cash balances.)

Presentation of Pension and Postretirement Costs—In March 2017, the FASB issued ASU 2017-07, Improving the Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Cost, which requires that the service cost component of net periodic pension cost be presented in the same statement of operations line item as other employee compensation costs, while the remaining components of net periodic pension cost be presented outside of operating income (loss). We retrospectively adopted ASU 2017-07 on January 1, 2018. The table below under "Summary of Adjustments to Prior Period Presentation" shows the impact of our retrospective adoption of ASU 2017-07 on our Condensed Consolidated Income Statements for the three and six months ended June 30, 2017. (See Note 7 for information related to our defined benefit pension plan in the U.K.)

Summary of Adjustments to Prior Period Presentation—The following table summarizes the impact of the retrospective adoption of ASC 606 and ASU 2017-07 on our Condensed Consolidated Income Statements for the three and six months ended June 30, 2017 (in thousands of dollars):

Three months ended June 30, 2017	As Previously Reported			ASC 606 Adjustment		ASU 2017-07 Adjustment			As Adjusted
Revenues:
Agency commissions and fees	$	276,807		$	24,961	$	—		$	301,768
Total revenues	$	314,898		$	24,961	$	—		$	339,859
Expenses:
Agency direct costs	$	29,881		$	24,961	$	—		$	54,842
Salaries and related	$	87,297		$	—	$	1,243		$	88,540
Total expenses	$	199,500		$	24,961	$	1,243		$	225,704
Operating income	$	115,398		$	—	$	(1,243	)	$	114,155
Non-operating (expense) income	$	(299	)	$	—	$	1,243		$	944
Net income attributable to Sotheby's	$	76,891		$	—	$	—		$	76,891

Six months ended June 30, 2017	As Previously Reported		ASC 606 Adjustment		ASU 2017-07 Adjustment			As Adjusted
Revenues:
Agency commissions and fees	$	376,300	$	36,733	$	—		$	413,033
Total revenues	$	502,435	$	36,733	$	—		$	539,168
Expenses:
Agency direct costs	$	39,398	$	36,733	$	—		$	76,131
Salaries and related	$	151,643	$	—	$	2,447		$	154,090
Total expenses	$	399,891	$	36,733	$	2,447		$	439,071
Operating income	$	102,544	$	—	$	(2,447	)	$	100,097
Non-operating income	$	541	$	—	$	2,447		$	2,988
Net income attributable to Sotheby's	$	65,566	$	—	$	—		$	65,566

The following table summarizes the impact of the retrospective adoption of ASU 2016-15 and ASU 2016-18 on our Condensed Consolidated Statement of Cash Flows for the six months ended June 30, 2017 (in thousands of dollars):

	As Previously Reported			ASU 2016-15 Adjustments			ASU 2016-18 Adjustments			As Adjusted
Operating Activities:
Changes in other operating assets and liabilities	$	(41,207	)	$	(2,100	)	$	—		$	(43,307	)
Net cash provided by operating activities	$	56,357		$	(2,100	)	$	—		$	54,257
Investing Activities:
Proceeds from company-owned life insurance	$	—		$	2,100		$	—		$	2,100
Decrease in restricted cash	$	7,749		$	—		$	(7,749	)	$	—
Net cash provided by investing activities	$	50,545		$	2,100		$	(7,749	)	$	44,896
Financing Activities:
Increase in restricted cash related to York Property Mortgage	$	(2,799	)	$	—		$	2,799		$	—
Net cash used by financing activities	$	(91,020	)	$	—		$	2,799		$	(88,221	)
Effect of exchange rate changes on cash, cash equivalents, and restricted cash	$	4,489		$	—		$	3,370		$	7,859
Increase (decrease) in cash, cash equivalents, and restricted cash (a)	$	20,371		$	—		$	(1,580	)	$	18,791
Cash, cash equivalents, and restricted cash at beginning of period (a)	$	496,031		$	—		60,170			$	556,201
Cash, cash equivalents, and restricted cash at end of period (a)	$	516,402		$	—		$	58,590		$	574,992

(a) Restricted cash is included only in the adjusted balances, reflecting the retrospective adoption of ASU 2016-18.

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Seasonality of Business

6 Months Ended

Jun. 30, 2018

Seasonality Of Business [Abstract]

Seasonality of Business

Seasonality of Business

The global art auction market has two principal selling seasons, which generally occur in the second and fourth quarters of the year. In the aggregate, second and fourth quarter Net Auction Sales¹ represented 80% and 82% of our total annual Net Auction Sales in 2017 and 2016, respectively, with auction commission revenues comprising approximately 66% and 75%, of our total revenues, respectively. Accordingly, our financial results are seasonal, with peak revenues and operating income generally occurring in the second and fourth quarters. Consequently, first and third quarter results have historically reflected lower revenues when compared to the second and fourth quarters and, typically, a net loss due to the fixed nature of many of our operating expenses.

___________________________________________________________________

¹ Represents the total hammer (sale) price of property sold at auction.

XML

Segment Reporting

6 Months Ended

Jun. 30, 2018

Segment Reporting [Abstract]

Segment Reporting

Segment Reporting

Our operations are organized under two segments—the Agency segment and the Finance segment, which does business as and is referred to in this report as Sotheby's Financial Services (or "SFS"). Thomas S. Smith, Jr, Sotheby's CEO, is our chief operating decision maker. Mr. Smith regularly evaluates financial information about each of our segments in deciding how to allocate resources and assess performance. The performance of each segment is measured based on segment income before taxes, which excludes the unallocated items highlighted in the reconciliation below.

Through our Agency segment, we accept works of art on consignment and match sellers (also known as consignors) to buyers through the auction or private sale process. In both auction and private sale transactions, we act as exclusive agent for the seller. Prior to offering a work of art for sale, we perform due diligence activities to authenticate and determine the ownership history and condition of the consigned artwork. To a much lesser extent, Agency segment activities also include the sale of artworks that are principally acquired as a consequence of the auction process, and RM Sotheby's, an equity investee that operates as an auction house for investment-quality automobiles. The Agency segment is an aggregation of the auction, private sale, and other related activities that are conducted across various collecting categories, all of which have similar economic characteristics and are similar in their services, customers, and the manner in which their services are provided.

SFS is an art financing company that operates as a niche lender with the ability to tailor attractive financing packages for clients who wish to obtain immediate access to liquidity from their art assets. SFS leverages the art expertise of the Agency segment, skill in international law and finance, and access to capital to provide art collectors and dealers with financing secured by their works of art, allowing them to unlock the value in their collections.

Art Agency, Partners (“AAP”), through which we offer art advisory services, provides art collectors with strategic guidance on collection identity and development, acquisitions, short and long-term planning, and provides advice to artists and artists' estates. In addition, from time-to-time, AAP brokers private art sales for its advisory clients. Our advisory services are classified within All Other for segment reporting purposes, along with our retail wine business, brand licensing activities, and the results from certain equity method investments.

The following table presents our segment information for the three and six months ended June 30, 2018 and 2017 (in thousands of dollars):

Three Months Ended June 30, 2018	Agency		SFS		All Other		Reconciling items				Total
Revenues	$	327,445	$	11,823	$	8,550	$	(2,182	)	(a)	$	345,636
Segment income before taxes	$	67,173	$	6,891	$	1,051	$	(1,234	)	(b)	$	73,881
Three Months Ended June 30, 2017
Revenues (c)	$	319,474	$	16,362	$	7,026	$	(3,003	)	(a)	$	339,859
Segment income before taxes	$	97,226	$	8,879	$	2,255	$	(466	)	(b)	$	107,894
Six Months Ended June 30, 2018
Revenues	$	507,178	$	24,239	$	14,732	$	(4,717	)	(a)	$	541,432
Segment income before taxes	$	57,467	$	15,402	$	2,439	$	(12,895	)	(b)	$	62,413
Six Months Ended June 30, 2017
Revenues (c)	$	499,665	$	30,733	$	13,377	$	(4,607	)	(a)	$	539,168
Segment income before taxes	$	68,804	$	16,212	$	4,721	$	(1,133	)	(b)	$	88,604

(a) The reconciling items related to revenues consist principally of amounts charged by SFS to the Agency segment, including interest and facility fees related to certain loans made to Agency segment clients, as well as fees charged for term loan collateral sold at auction or privately through the Agency segment.

(b) The reconciling items related to segment income before taxes are detailed in the table below.

(c) Agency segment revenue for the three and six months ended June 30, 2017 has been recast to reflect the retrospective adoption of ASC 606. See Notes 1 and 4.

The table below presents a reconciliation of total segment income before taxes to consolidated income before taxes for the three and six months ended June 30, 2018 and 2017 (in thousands of dollars):

	Three Months Ended June 30,						Six Months Ended June 30,
	2018			2017			2018			2017
Agency	$	67,173		$	97,226		$	57,467		$	68,804
SFS	6,891			8,879			15,402			16,212
All Other	1,051			2,255			2,439			4,721
Segment income before taxes	75,115			108,360			75,308			89,737
Unallocated amounts and reconciling items:
Extinguishment of debt	—			—			(10,855		)	—
Equity in earnings of investees (a)	(1,234		)	(466		)	(2,040		)	(1,133		)
Income before taxes	$	73,881		$	107,894		$	62,413		$	88,604

(a) For segment reporting purposes, our share of earnings related to equity investees is included as part of income before taxes. However, such earnings are reported separately below income before taxes in our Condensed Consolidated Income Statements.

The table below presents segment assets, as well as a reconciliation of segment assets to consolidated assets as of June 30, 2018, December 31, 2017, and June 30, 2017 (in thousands of dollars):

	June 30, 2018		December 31, 2017		June 30, 2017
Agency	$	2,227,296	$	2,395,429	$	2,130,731
SFS	494,420		608,713		663,500
All Other	43,625		40,566		48,051
Total segment assets	2,765,341		3,044,708		2,842,282
Unallocated amounts and reconciling items:
Deferred tax assets and income tax receivable	46,326		42,599		23,096
Reconciling item related to SFS (a)	—		—		(25,000		)
Consolidated assets	$	2,811,667	$	3,087,307	$	2,840,378

(a) As of June 30, 2017, segment assets for SFS included a $25 million consignor advance that is netted against an associated auction payable balance on our Condensed Consolidated Balance Sheets.

Substantially all of our capital expenditures for the six months endedJune 30, 2018, the year ended December 31, 2017, and the six months endedJune 30, 2017 were attributable to the Agency segment.

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Revenues

6 Months Ended

Jun. 30, 2018

Revenue from Contract with Customer [Abstract]

Revenues

Revenues

The Agency segment, which is our predominant source of revenue, earns commissions and fees by acting as agent for clients wishing to sell their artworks through the auction or private sale process. To a much lesser extent, the Agency segment also earns revenues from the sale of artworks that are owned by Sotheby's. Outside of the Agency segment, we earn revenues from art advisory services, retail wine sales, and brand licensing activities, which are aggregated and classified within All Other for segment reporting purposes, as well as from the art-related financing activities conducted by SFS. The revenues earned by the Agency and All Other segments are accounted for in accordance with ASC 606, Revenue from Contracts with Customers, which was retrospectively adopted on January 1, 2018. The revenues earned by SFS are not within the scope of ASC 606. (See Note 1 for information regarding the retrospective adoption of ASC 606.)

The following table summarizes our revenues by segment and type for the three and six months ended June 30, 2018 and 2017 (in thousands of dollars):

	Three Months Ended June 30, 2018								Three Months Ended June 30, 2017
	Agency		SFS		All Other		Total		Agency		SFS		All Other			Total
Revenue from contracts with customers:
Agency commissions and fees:
Auction commissions	$	257,799	$	—	$	—	$	257,799	$	266,949	$	—	$	—		$	266,949
Auction related fees, net (a)	6,081		—		—		6,081		16,045		—		—			16,045
Private sale commissions	24,016		—		500		24,516		14,827		—		—			14,827
Other Agency commissions and fees	2,359		—		124		2,483		3,947		—		—			3,947
Total Agency commissions and fees	290,255		—		624		290,879		301,768		—		—			301,768
Inventory sales	37,190		—		2,916		40,106		17,706		—		2,231			19,937
Advisory revenues	—		—		1,156		1,156		—		—		1,431			1,431
License fee and other revenues	—		—		3,854		3,854		—		—		3,364			3,364
Total revenue from contracts with customers	327,445		—		8,550		335,995		319,474		—		7,026			326,500
Finance revenue:
Interest and related fees	—		9,641		—		9,641		—		13,359		—		9,881	13,359
Total revenues	$	327,445	$	9,641	$	8,550	$	345,636	$	319,474	$	13,359	$	7,026		$	339,859

	Six Months Ended June 30, 2018										Six Months Ended June 30, 2017
	Agency			SFS			All Other		Total		Agency			SFS			All Other		Total
Revenue from contracts with customers:
Agency commissions and fees:
Auction commissions	$	389,929	—	$	—	—	$	—	$	389,929	$	357,565	—	$	—	—	$	—	$	357,565
Auction related fees, net (a)	17,824		—	—		—	—		17,824		21,498		—	—		—	—		21,498
Private sale commissions	43,501		—	—		—	500		44,001		28,047		—	—		—	—		28,047
Other Agency commissions and fees	4,351		—	—		—	300		4,651		5,923		—	—		—	—		5,923
Total Agency commissions and fees	455,605			—			800		456,405		413,033			—			—		413,033
Inventory sales	51,573		—	—		—	4,769		56,342		86,632			—			4,682		91,314
Advisory revenues	—		—	—		—	2,406		2,406		—		—	—		—	2,829		2,829
License fee and other revenues	—		—	—		—	6,757		6,757		—		—	—		—	5,866		5,866
Total revenue from contracts with customers	507,178			—			14,732		521,910		499,665			—			13,377		513,042
Finance revenue:
Interest and related fees	—		—	19,522		—	—		19,522		—		—	26,126		—	—		26,126
Total revenues	$	507,178		$	19,522		$	14,732	$	541,432	$	499,665		$	26,126		$	13,377	$	539,168

(a) Auction Related Fees, net includes the net overage or shortfall attributable to auction guarantees, consignor expense recoveries, and shipping fees charged to buyers.

Auction Commissions—In our role as auctioneer, we accept works of art on consignment and match sellers (also known as consignors) to buyers through the auction process. In an auction transaction, we act as exclusive agent for the seller. The terms of our arrangement with the seller are stipulated in a consignment agreement, which, among other things, entitles us to collect and retain an auction commission as compensation for our service. Our auction commission includes a premium charged to the buyer and, to a lesser extent, a commission charged to the seller, both of which are calculated as a percentage of the hammer price of the property sold at auction. In certain situations, in order to secure a high-value consignment, we may not charge a seller's commission and/or may share a portion of our buyer's premium with the seller. In situations when we share a portion of our buyer's premium with the seller, our auction commission revenue is recorded net of the amount paid to the seller.

Prior to the date of the auction, we perform a number of activities in connection with our obligations under an auction consignment agreement, which may include: (i) transporting the consigned artwork to the location of the auction sale; (ii) performing due diligence to authenticate and determine the ownership history and condition of the consigned artwork; (iii) preparing the consigned artwork for auction (e.g., framing and cleaning); (iv) preparing catalogue content related to the consigned artwork (e.g., photography and description of the artwork); (v) marketing the artwork through exhibitions and advertising campaigns; (vi) establishing presale estimates for the consigned artwork in response to an assessment of buyer demand and overall market conditions; and (vii) conducting pre-auction bidder registration and qualification. The services associated with these activities are necessary components of our auction service, which culminates in the creation of a public marketplace for the sale and purchase of art that, if successful, results in the matching of the seller to a buyer upon the fall of the auctioneer's hammer.

Upon the fall of the auctioneer's hammer, the highest bidder becomes legally obligated to pay the aggregate purchase price (i.e., the hammer price plus buyer's premium) and the consignor is legally obligated to relinquish the property in exchange for the net sale proceeds (i.e., the hammer price less any seller's commission and expense recoveries). However, if the bidding for an individual artwork does not reach its reserve price (i.e., the confidential minimum hammer price at which the consignor has agreed to sell), the sale is not completed, and we are not entitled to collect a commission. Accordingly, the consignor receives the benefit of our auction service only when the sale is completed, upon the fall of the auctioneer's hammer, at which point in time we recognize our auction commission revenue.

Under the standard terms and conditions of our auction sales, we are not obligated to pay the consignor for property that has not been paid for by the buyer. If a buyer defaults on payment, the sale is cancelled, and the property is returned to the consignor. We continually evaluate the collectability of amounts due from individual buyers and only recognize auction commission revenue when the collection of the amount due from the buyer is probable. If we determine that payment from the buyer is not probable, a cancelled sale is recorded in the period in which that determination is made and the associated Accounts Receivable balance, including our auction commission, is reversed. Our judgments regarding the collectability of Accounts Receivable are based on an assessment of the buyer's payment history, discussions with the buyer, and the value of any property held as security against the buyer's payment obligation. Our judgments with respect to the collectability of amounts due from buyers for auction purchases may prove, with the benefit of hindsight, to be incorrect. Historically, cancelled sales have not been material in relation to the aggregate hammer price of property sold at auction.

For artworks purchased at auction, the buyer is provided a five-year guarantee of authenticity. Subject to certain limitations, this guarantee generally attests to the authorship of the artwork. In the event a valid claim is made by the buyer under the authenticity guarantee, the sale is rescinded and we are obligated to refund the aggregate purchase price to the buyer. In these circumstances, the consignor is obligated to return any net sale proceeds paid to them. Outside of a valid authenticity claim, the buyer has no right to rescind an auction sale. The authenticity guarantee provided to the auction buyer is a product warranty that is associated with the provision of our auction service; it may not be purchased separately and does not provide an additional service to the buyer.

Auction Guarantee Overage (Shortfall)—From time-to-time, in the ordinary course of business, we will provide a guarantee to the consignor that their consigned artwork will achieve a specified minimum sale price at auction. This type of arrangement is known as an auction guarantee. If the property offered under an auction guarantee sells above the minimum guaranteed price, we are generally entitled to a share of the overage. In the event that the property sells for less than the minimum guaranteed price, we must perform under the auction guarantee by funding the shortfall between the sale price at auction and the amount of the auction guarantee. If the property offered under the auction guarantee does not sell, we must pay the amount of the auction guarantee to the consignor and then take ownership of the unsold property and may recover the amount paid through its future sale. In certain limited situations, if the guaranteed property fails to sell at auction or if the purchaser defaults, the consignor has the right to cancel the auction guarantee and retain the property. 

In situations when an item of guaranteed property does not sell and we take ownership of the property, it is taken into Inventory and recorded on our balance sheet at the lower of its cost (i.e., the amount paid under the auction guarantee) or our estimate of the property’s net realizable value (i.e., the expected sale price upon its eventual disposition).

We may reduce our financial exposure under auction guarantees through contractual risk sharing arrangements. Such auction guarantee risk sharing arrangements include irrevocable bid arrangements and, from time-to-time, partner sharing arrangements.

An irrevocable bid is an arrangement under which a counterparty irrevocably commits to bid a predetermined price on the guaranteed property. If the irrevocable bid is not the winning bid, the counterparty is generally entitled to receive, as their fee, a share of the buyer's premium earned on the sale and/or a share of any auction guarantee overage. Such fees paid to irrevocable bid counterparties are recorded within Agency Direct Costs in the period of the sale. If the irrevocable bid is the winning bid, the counterparty may sometimes receive a fee as compensation for providing the irrevocable bid. This fee is netted against the counterparty's obligation to pay the full purchase price (i.e., the hammer price plus buyer's premium) and is recorded as a reduction to our auction commission revenue in the period of the sale.

In a partner sharing arrangement, a counterparty commits to fund: (i) a share of the difference between the sale price at auction and the amount of the auction guarantee, if the property sells for less than the minimum guaranteed price, or (ii) a share of the minimum guaranteed price if the property does not sell, while taking ownership of a proportionate share of the unsold property. In exchange for accepting a share of the financial exposure under the auction guarantee, if the property sells, the counterparty in a partner sharing arrangement is generally entitled to receive, as their fee, a share of the buyer's premium earned on the sale and/or a share of any auction guarantee overage. Such fees paid to the counterparties in auction guarantee partner sharing arrangements are recorded within Agency Direct Costs in the period of the sale.

Similar to a standard auction transaction, for property sold under an auction guarantee, the consignor receives the benefit of our auction service only when the sale is completed, upon the fall of the auctioneer's hammer, at which point in time we recognize our auction commission revenue and any auction guarantee overage or shortfall. In the event that the property offered under an auction guarantee sells for a hammer price that is less than the minimum guaranteed price, the amount of the shortfall is recorded net of any buyer’s premium commission earned on the sale. An auction guarantee shortfall may also be recognized prior to the date of the auction if we determine that it is probable that the expected selling price of the property, including buyer's premium, will not exceed the amount of the auction guarantee.

Consignor Expense Recoveries—We incur various direct costs in the fulfillment of our auction service. These costs principally relate to the transport of consigned artworks to the location of the auction sale, various sale marketing activities including catalogue production and distribution, and the exhibition of consigned artworks. Auction consignment agreements sometimes permit us to recover all or a portion of these costs from the consignor through a deduction from their net sale proceeds if the item is sold at auction. Such recoveries are recognized as revenue in the period of the auction sale.

Buyer Shipping Fees—Auction buyers may be charged a fee for shipping services associated with their purchased property. Such fees are recognized as revenue in the period when the shipping service is provided.

Private Sale Commissions—Private sale commission revenues are earned through the direct brokering of purchases and sales of art. Private sales are generally initiated by a client wishing to sell their artwork (i.e., the consignor) with Sotheby's acting as their exclusive agent in the transaction. Such arrangements are evidenced by a legally binding consignment agreement between us and the seller, which outlines the terms of the arrangement, including the desired sale price and the amount or rate of commission that we may earn if a sale is completed, as well as, in certain instances, the period of time over which the artwork may be offered for private sale. The terms of the private sale consignment agreement create our sole performance obligation, which is to broker a legally binding sale of the consigned artwork to a qualified buyer as exclusive agent for the seller.

In connection with our efforts to fulfill our performance obligation under a private sale consignment agreement, we perform a number of activities, which may include: (i) transporting the consigned artwork to the location of the sale; (ii) performing due diligence to authenticate and determine the ownership history and condition of the consigned artwork; (iii) preparing the consigned artwork for sale (e.g., framing and cleaning); (iv) providing advice as to an appropriate asking price for the consigned artwork in response to an assessment of buyer demand and overall market conditions; (v) marketing the artwork to a select group of potential buyers or through theme-based private sale exhibitions; and (vi) completing all relevant administrative tasks related to completion of the sale.

In certain situations, when completing a private sale, we may execute a legally binding agreement with the buyer stipulating the terms pursuant to which the buyer will purchase the consigned artwork. In situations when a legally binding buyer agreement is not executed, only an invoice is issued to provide the buyer with the information necessary for finalizing the transaction (e.g., the amount owed and any associated taxes and royalties, the payment due date, payment instructions, etc.).

The consignor receives the benefit of our private sale service only upon the completion of a legally binding sale. For private sales where we execute a buyer agreement, the consignor receives the benefit of our private sale service and revenue is recognized at the point in time when the agreement is signed by the buyer. At this point in time, the buyer becomes legally obligated to pay the purchase price and the consignor is legally obligated to relinquish the property in exchange for the net sale proceeds (i.e., the purchase price less our commission). In the absence of an executed buyer agreement, the consignor receives the benefit of our private sale service and revenue is recognized at the point in time when the full purchase price is paid by the buyer. At this point in time, we have performed all of our service obligations in the transaction and the consignor is legally obligated to relinquish the property in exchange for the net sale proceeds. If we are not successful in completing a sale according to the terms of the private sale consignment agreement, we are not entitled to collect a commission.

For artworks purchased in a private sale transaction, the buyer is provided a guarantee of authenticity for a period of up to five years. Subject to certain limitations, this guarantee generally attests to the authorship of the artwork. In the event a valid claim is made by the buyer under the authenticity guarantee, the sale is rescinded and we are obligated to refund the purchase price to the buyer. In these circumstances, the consignor is obligated to return any net sale proceeds paid to them. Outside of a valid authenticity claim, the buyer has no right to rescind a completed private sale. The authenticity guarantee provided to the buyer is a product warranty that is associated with the provision of our private sale service; it may not be purchased separately and does not provide an additional service to the buyer.

Other Agency Commissions and Fees—From time-to-time, we earn commissions and fees connected with sales of art brokered by third parties. These commissions and fees are recognized at a point in time in the period when we receive confirmation from the third parties that the sale has been completed.

Inventory Sales—From time-to-time, the Agency segment earns revenue from the sale of: (i) artworks that have been obtained as a result of the failure of guaranteed property to sell at auction; (ii) artworks that have been purchased opportunistically, including property acquired for sale at auction; and (iii) other objects obtained incidental to the auction process (e.g., as a result of buyer default).

Inventory sales may be consummated through either a private sale transaction or through an auction sale. For artworks that are sold privately, an executed agreement with the buyer is used to document the terms and conditions of the transaction. For artworks that are sold at auction, the sale is completed pursuant to the conditions of sale published in the corresponding auction catalogue. Regardless of the method of sale, title and control of the artwork are transferred to the buyer only upon payment of the full purchase price. Accordingly, sales of inventory are recognized at a point in time in the period when title and control of the artwork is transferred to the buyer.

Advisory Revenues—Advisory revenues consist of fees earned from providing art-related advice to certain clients. These arrangements may be evidenced by a legally binding written retainer agreement with the client, which outlines the nature of the services to be provided and the amount of fees to be earned. Advisory retainer agreements are typically one year in duration. Advisory services are also sometimes provided on the basis of a verbal agreement with the client. For advisory arrangements with written retainer agreements, revenues are recognized ratably over time, based on the contractual period and as services are provided to the client. In the absence of a written retainer agreement, revenue recognition is deferred until we have performed our substantive service obligations and the client has made payment for those services, thereby evidencing the terms of the arrangement.

License Fee Revenues—Prior to 2004, we were engaged in the marketing and brokerage of luxury residential real estate sales through Sotheby's International Realty ("SIR"). In 2004, we sold SIR to a subsidiary of Realogy Corporation ("Realogy"), formerly Cendant Corporation. In conjunction with the sale, we entered into an agreement with Realogy to license the SIR trademark and certain related trademarks for an initial 50-year term with a 50-year renewal option (the "Realogy License Agreement"). The Realogy License Agreement is applicable worldwide.The Realogy License Agreement provides for an ongoing license fee during its term based on the volume of commerce transacted under the licensed trademarks. We also license the Sotheby's name for use in connection with the art auction business in Australia, and art education services in the U.S. and the U.K. The license fees earned from these arrangements are sales-based and are recognized in the periods in which the underlying sales occur.

Sales, Use and Value-Added Taxes—Sales, use and value-added taxes assessed by governmental authorities that are both imposed on and concurrent with revenue-producing transactions between us and our clients are reported on a net basis within revenues.

Resale Royalties—In certain foreign jurisdictions, various resale royalties and other fees are imposed on auctioneers upon the completion of an auction sale. These royalties and fees are reported on a gross basis within Agency Direct Costs.

Contract Balances—Following the completion of an auction or private sale, we invoice the buyer for the aggregate purchase price of the property, which includes our buyer's premium or private sale commission, as well as any applicable taxes and royalties. The amount owed by the buyer is recorded within Accounts Receivable, and the amount of net sale proceeds due to the seller is recorded within Client Payables. Upon collection from the buyer, we are obligated to remit the net proceeds to the seller after deducting our commissions and related fees, as well as any applicable taxes and royalties, which are ultimately paid to the appropriate taxing authority or royalty association.

Under our standard auction payment terms, the purchase price is due from the buyer no more than 30 days after the sale date, with the net proceeds due to the consignor 35 days after the sale date. For private sales, payment from the buyer is typically due on the sale date, with the net sale proceeds due to the consignor shortly thereafter. We also sometimes provide extended payment terms to an auction or private sale buyer. For auctions, the extent to which extended payment terms are provided can vary considerably from selling season to selling season. Extended payment terms typically extend the payment due date to a date that is no longer than one year from the sale date. In limited circumstances, the payment due date may be extended to a date that is beyond one year from the sale date. When providing extended payment terms, we attempt to match the timing of cash receipt from the buyer with the timing of our payment to the consignor, but are not always successful in doing so. All extended payment term arrangements are approved by management under our internal corporate governance policy.

In the limited circumstances when the buyer's payment due date is extended to a date that is beyond one year from the sale date, if the seller does not provide matched payment terms (i.e., we pay the seller before receiving payment from the buyer), the receivable balance is reclassified from Accounts Receivable to Notes Receivable on our Condensed Consolidated Balance Sheets. See Note 5 for information on Agency segment Notes Receivable.

When the buyer's due date is extended to a date that is one year or less from the sale date, as a practical expedient, we do not record a discount to our commission to account for the effects of the financing component. However, in the limited circumstances when the buyer's due date is extended to a date that is beyond one year from the sale date, we record a discount to our commission revenue to reflect the financing component, if material.

The table below summarizes the balances related to our contracts with customers as of and for the six months ended June 30, 2018 and 2017 (in thousands of dollars):

	June 30, 2018		June 30, 2017
Accounts Receivable
Balance as of beginning of period	$	783,706	$	424,418
Balance as of end of period	$	1,076,152	$	837,200
Increase/(decrease)	$	292,446	$	412,782
Client Payables
Balance as of beginning of period	$	996,197	$	511,876
Balance as of end of period	$	1,191,581	$	867,856
Increase/(decrease)	$	195,384	$	355,980

The balances of Accounts Receivable presented in the table above relate almost entirely to amounts due from auction and private sale buyers. To a much lesser extent, they also include amounts owed to us in relation to our advisory services and brand licensing activities. Interest and related fees due to SFS, which are recorded within Accounts Receivable on our Condensed Consolidated Balance Sheets, are excluded from this table because they are not considered to be contract balances under ASC 606.

The net increases in Accounts Receivable and Client Payables for the periods ending June 30, 2018 and 2017 are largely the result of auction sales occurring in the second quarter for which the sale proceeds were not yet collected from buyers and remitted to sellers as of the balance sheet date. When compared to June 30, 2017, the increases in Accounts Receivable and Client Payables are principally due to the higher levels of auction and private sales through the second quarter of 2018, a decrease in early consignor settlements (as discussed in the following paragraph), and the general timing of buyer and consignor settlements.

In certain instances, and subject to management approval under our internal corporate governance policy, we may pay the net sale proceeds to the seller before payment is collected from the buyer and/or we may allow the buyer to take possession of the property before making payment. In situations when the buyer takes possession of the property before making payment, we are liable to the seller for the net sales proceeds whether or not the buyer makes payment. As of June 30, 2018, December 31, 2017, and June 30, 2017, Accounts Receivable included $75.3 million, $92.1 million, and $85.3 million, respectively, related to situations when we paid the seller all or a portion of the net sales proceeds before payment was collected from the buyer. As of June 30, 2018, December 31, 2017, and June 30, 2017, Accounts Receivable (net) also included $26.9 million, $53.8 million, and $33.4 million, respectively, related to situations when we allowed the buyer to take possession of the property before making payment.

Deferred revenue balances are generally not material. However, as of June 30, 2017, our Condensed Consolidated Balance Sheets include a significant deferred revenue balance related to the sale of an item of Inventory. (See Note 10.)

Contract Costs—We incur various direct costs in the fulfillment of our auction services. These costs principally relate to the transport of consigned artworks to the location of the auction sale, various sale marketing activities including catalogue production and distribution, and the exhibition of consigned artworks. A large portion of these costs are funded prior to the auction and are recorded on our Condensed Consolidated Balance Sheets within Prepaid Expenses and Other Current Assets until the date of the auction sale when they are expensed to Direct Costs of Services in the Condensed Consolidated Income Statements. As of June 30, 2018, December 31, 2017, and June 30, 2017, the contract cost balances recorded within Prepaid Expenses and Other Current Assets were $6.8 million, $9.6 million, and $7.5 million, respectively.

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Notes Receivable

6 Months Ended

Jun. 30, 2018

Receivables [Abstract]

Notes Receivable

Notes Receivable

Sotheby's Financial Services—SFS makes term loans secured by artworks that are not presently intended for sale, allowing us to establish or enhance mutually beneficial relationships with art collectors. Term loans may also generate future auction or private sale consignments through the sale of the collateral at the conclusion of the loan and/or through future purchases of new property by the borrower. In certain situations, term loans are made to refinance the accounts receivable balances generated by the auction and private sale purchases of our clients. Term loans normally have initial maturities of up to two years and typically carry a variable market rate of interest. To a much lesser extent, SFS also makes consignor advances secured by artworks that are contractually committed, in the near term, to be offered for sale through the Agency segment. Consignor advances allow sellers to receive funds upon consignment for an auction or private sale that will occur up to one year in the future and normally have short-term maturities.

As of June 30, 2018, December 31, 2017, and June 30, 2017, the net Notes Receivable balance of SFS was $480 million, $590.6 million, and $651.4 million, respectively. As of June 30, 2018, December 31, 2017, and June 30, 2017, the total net Notes Receivable balance of SFS included $28.4 million, $54.4 million, and $85.6 million, respectively, of term loans issued by SFS to refinance client auction and private sale purchases. For the six months ended June 30, 2018 and 2017, SFS issued $15.1 million and $3.8 million, respectively, of such loans. These loans are accounted for as non-cash transfers between Accounts Receivable (net) and Notes Receivable (net) and are, therefore, not reflected as the funding of Notes Receivable within Investing Activities in our Condensed Consolidated Statements of Cash Flows. Upon repayment, the cash received in settlement of such Notes Receivable is classified within Operating Activities in our Condensed Consolidated Statements of Cash Flows. For the six months ended June 30, 2018 and 2017, such repayments totaled $41.1 million and $6.9 million, respectively.

The repayment of secured loans can be adversely impacted by a decline in the art market in general or in the value of the collateral, which is concentrated within certain collecting categories. In addition, in situations when there are competing claims on the collateral and/or when a borrower becomes subject to bankruptcy or insolvency laws, our ability to realize on our collateral may be limited or delayed.

We aim to mitigate the risk associated with a potential devaluation in our collateral by targeting a 50% loan-to-value ("LTV") ratio (i.e., the principal loan amount divided by the low auction estimate of the collateral). However, loans may also be made with LTV ratios between 51% and 60%, and, in rare circumstances, loans may be made at an initial LTV ratio higher than 60%. 

The LTV ratio of certain loans may increase above the 50% target due to a decrease in the low auction estimates of the collateral. The revaluation of term loan collateral is performed by our specialists on an annual basis or more frequently if there is a material change in the circumstances related to the loan, the value of the collateral, the disposal plans for the collateral, or if an event of default occurs. We believe that the LTV ratio is a critical credit quality indicator for the secured loans made by SFS.

The table below provides the aggregate LTV ratio for the SFS loan portfolio as of June 30, 2018, December 31, 2017, and June 30, 2017 (in thousands of dollars):

	June 30, 2018			December 31, 2017			June 30, 2017
Secured loans	$	479,972		$	590,609		$	651,361
Low auction estimate of collateral	$	1,159,693		$	1,369,235		$	1,445,847
Aggregate LTV ratio	41		%	43		%	45		%

The table below provides the aggregate LTV ratio for secured loans made by SFS with an LTV ratio above 50% as of June 30, 2018, December 31, 2017, and June 30, 2017 (in thousands of dollars):

	June 30, 2018			December 31, 2017			June 30, 2017
Secured loans with an LTV ratio above 50%	$	105,744		$	168,116		$	209,483
Low auction estimate of collateral related to secured loans with an LTV ratio above 50%	$	182,398		$	269,063		$	375,933
Aggregate LTV ratio of secured loans with an LTV ratio above 50%	58		%	62		%	56		%

The table below provides other credit quality information regarding secured loans made by SFS as of June 30, 2018, December 31, 2017, and June 30, 2017 (in thousands of dollars):

	June 30, 2018		December 31, 2017		June 30, 2017
Total secured loans	$	479,972	$	590,609	$	651,361
Loans past due	$	62,310	$	62,570	$	108,560
Loans more than 90 days past due	$	41,819	$	56,087	$	41,448
Non-accrual loans	$	15,402	$	—	$	—
Impaired loans	$	—	$	—	$	—
Allowance for credit losses:
Allowance for credit losses for impaired loans	$	—	$	—	$	—
Allowance for credit losses based on historical data	1,132		1,253		1,290
Total allowance for credit losses - secured loans	$	1,132	$	1,253	$	1,290

We consider a loan to be past due when principal payments are not paid by the contractual maturity date. Typically, a loan becomes past due only for a short period of time during which either the loan is renewed or collateral is sold to satisfy the borrower's obligations. As of June 30, 2018, $62.3 million of the net Notes Receivable balance was past due, of which $41.8 million was more than 90 days past due. We are continuing to accrue interest on $46.9 million of past due loans and, as of June 30, 2018, the collateral securing such loans had a low auction estimate of approximately $190.8 million, resulting in an LTV ratio of approximately 25%. In consideration of expected loan renewals, collateral sales to date for which the proceeds have not yet been collected from the buyer, as well as the value of the remaining collateral and our current collateral disposal plans, we believe that the principal and interest amounts owed for these past due loans will be collected.

A non-accrual loan is a loan for which future Finance revenue is not recorded due to our determination that it is probable that future interest on the loan is not collectible. Any cash receipts subsequently received on non-accrual loans are first applied to reduce the recorded principal balance of the loan, with any proceeds in excess of the principal balance then applied to interest owed by the borrower. The recognition of Finance revenue may resume on a non-accrual loan if sufficient additional collateral is provided by the borrower or if we become aware of other circumstances that indicate that it is probable that the borrower will make future interest payments on the loan. As of January 1, 2018, one of the past due loans included in the table above was placed on non-accrual status. During the first and second quarters of 2018, our investment in this loan was reduced by $32 million as the result of proceeds collected from collateral sales. As of June 30, 2018, our recorded investment in this loan was approximately $17.2 million, consisting of the $15.4 million principal balance and $1.8 million in accrued interest. Additional collateral sale proceeds of $14.1 million are expected to be collected from auction buyers later in 2018. Following the collection of these collateral sale proceeds, our recorded investment in the loan will be approximately $3.1 million. We expect to recover our investment in this loan through the future sale of the remaining loan collateral, which is expected to be offered at auction and through private sales during the remainder of 2018.

A loan is considered to be impaired when we determine that it is probable that a portion of the principal and interest owed by the borrower will not be recovered after taking into account the estimated realizable value of the collateral securing the loan, as well as the ability of the borrower to repay any shortfall between the value of the collateral and the amount of the loan. If a loan is considered to be impaired, Finance revenue is no longer recognized and bad debt expense is recorded for any principal or accrued interest that is deemed uncollectible. As of June 30, 2018, December 31, 2017, and June 30, 2017, there were no impaired loans outstanding.

As of June 30, 2018, unfunded commitments to extend additional credit through SFS were approximately $50.2 million.

Agency Segment—As discussed above, in the limited circumstances when the payment due date for an auction or private sale receivable is extended to a date that is beyond one year from the sale date, if the consignor does not provide matched payment terms, the receivable balance is reclassified from Accounts Receivable (net) to Notes Receivable (net) on our Condensed Consolidated Balance Sheets. As of June 30, 2018, December 31, 2017, and June 30, 2017, Notes Receivable (net) within the Agency segment included $1.2 million, $2.7 million, and $2.6 million of such amounts reclassified from Accounts Receivable (net). These Notes Receivable are accounted for as non-cash transfers between Accounts Receivable (net) and Notes Receivable (net) and are, therefore, not reflected as the funding of Notes Receivable within Investing Activities in our Condensed Consolidated Statements of Cash Flows. Upon repayment, the cash received in settlement of such Notes Receivable is classified within Operating Activities in our Condensed Consolidated Statements of Cash Flows. For the six months ended June 30, 2018 and 2017, such repayments totaled $1 million and $5 million, respectively.

Under certain circumstances, we provide loans to certain art dealers to finance the purchase of works of art. In these situations, we acquire a partial ownership interest or a security interest in the purchased property in addition to providing the loan. Upon the eventual sale of the property acquired, the loan is repaid. As of June 30, 2017, such loans totaled $3.8 million. In the fourth quarter of 2017, we determined one of these loans to be impaired as a result of the bankruptcy of the art dealer and recorded a credit loss of $1.5 million in the period. We have commenced legal proceedings against one of the individuals who personally guaranteed this loan. As of June 30, 2018 and December 31, 2017, we had one loan outstanding of this type with a balance of $2.1 million. We are no longer accruing interest on this loan, but we believe that the recorded balance of this loan is collectible.

Allowance for Credit Losses—During the period January 1, 2018 to June 30, 2018, activity related to the Allowance for Credit Losses by segment was as follows (in thousands of dollars):

	SFS			Agency		Total
Balance as of January 1, 2018	$	1,253		$	1,525	$	2,778
Change in loan loss provision based on historical data	(121		)	—		(121		)
Balance as of June 30, 2018	$	1,132		$	1,525	$	2,657

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Goodwill and Intangible Assets

6 Months Ended

Jun. 30, 2018

Goodwill and Intangible Assets Disclosure [Abstract]

Goodwill and Intangible Assets

Goodwill and Intangible Assets

Goodwill—For the six months ended June 30, 2018 and 2017, changes in the carrying value of Goodwill were as follows (in thousands of dollars):

	Six Months Ended June 30, 2018								Six Months Ended June 30, 2017
	Agency			All Other		Total			Agency		All Other		Total
Beginning balance as of January 1	$	44,396		$	6,151	$	50,547		$	43,878	$	6,151	$	50,029
Goodwill acquired	5,259			—		5,259			—		—		—
Foreign currency exchange rate changes	(136		)	—		(136		)	322		—		322
Ending balance as of June 30	$	49,519		$	6,151	$	55,670		$	44,200	$	6,151	$	50,351

On February 2, 2018, we acquired Viyet, an online marketplace for interior design specializing in vintage and antique furniture, decorative objects, and accessories. This acquisition complements and enhances our online sales program, and provides an additional sale format to offer clients.

Intangible Assets—As of June 30, 2018, December 31, 2017, and June 30, 2017, intangible assets consisted of the following (in thousands of dollars):

	Amortization Period	June 30, 2018			December 31, 2017			June 30, 2017
Indefinite lived intangible assets:
License (a)	N/A	$	324		$	324		$	324
Intangible assets subject to amortization:
Customer relationships - Art Advisory Partners	8 years	10,800			10,800			10,800
Non-compete agreements - Art Advisory Partners	6 years	3,060			3,060			3,060
Artworks database (b)	10 years	1,200			1,200			1,125
Technology	4 years	4,461			—			—
Total intangible assets subject to amortization		19,521			15,060			14,985
Accumulated amortization		(5,232		)	(3,892		)	(2,902		)
Total amortizable intangible assets (net)		14,289			11,168			12,083
Total intangible assets (net)		$	14,613		$	11,492		$	12,407

(a) Relates to a license obtained in conjunction with the purchase of a retail wine business in 2008.

(b) Relates to a database containing historic information concerning repeat sales of works of art. This database was acquired along with the associated business in exchange for an initial cash payment made in the third quarter of 2016 and a subsequent cash payment made in the third quarter of 2017.

For the three and six months ended June 30, 2018, amortization expense related to intangible assets was approximately $0.7 million and $1.3 million, respectively. For the three and six months ended June 30, 2017, amortization expense related to intangible assets was approximately $0.5 million and $1 million, respectively.

The estimated aggregate amortization expense for the remaining useful lives of intangible assets subject to amortization during the five-year period succeeding the June 30, 2018 balance sheet date are as follows (in thousands of dollars):

Period	Amount
July 2018 to June 2019	$	3,095
July 2019 to June 2020	$	3,095
July 2020 to June 2021	$	3,095
July 2021 to June 2022	$	2,376
July 2022 to June 2023	$	1,470

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Defined Benefit Pension Plan

6 Months Ended

Jun. 30, 2018

Retirement Benefits [Abstract]

Defined Benefit Pension Plan

Defined Benefit Pension Plan

We sponsor a defined benefit pension plan in the U.K. (the "U.K. Pension Plan"), which was closed to future service cost accruals on April 30, 2016. For the three and six months ended June 30, 2018 and 2017, the components of the net pension credit for the U.K. Pension Plan recorded within Non-Operating Income in our Condensed Consolidated Income Statements were as follows (in thousands of dollars):

	Three Months Ended June 30,						Six Months Ended June 30,
	2018			2017			2018			2017
Interest cost	$	1,939		$	1,999		3,920			3,937
Expected return on plan assets	(2,839		)	(3,514		)	(5,741		)	(6,921		)
Prior service cost	—			15			—			30
Amortization of actuarial loss	122			280			247			553
Amortization of prior service cost	(26		)	(23		)	(52		)	(46		)
Net pension credit	$	(804	)	$	(1,243	)	$	(1,626	)	$	(2,447	)

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Debt

6 Months Ended

Jun. 30, 2018

Debt Disclosure [Abstract]

Debt

Debt

Revolving Credit Facilities—Prior to June 26, 2018, we were party to credit agreements with an international syndicate of lenders that, among other things, provided for dedicated asset-based revolving credit facilities for the Agency segment (the "Agency Credit Facility") and SFS (the "SFS Credit Facility") (collectively, the "Previous Credit Agreements"). The Previous Credit Agreements were scheduled to mature on August 22, 2020.

On June 26, 2018, we refinanced the Previous Credit Agreements and entered into a new credit agreement with an international syndicate of lenders led by JPMorgan Chase Bank, N.A. (the “New Credit Agreement”). The proceeds under the New Credit Agreement may be used for our working capital and other general corporate purposes and borrowings thereunder are available in U.S. Dollars, Pounds Sterling, Euros, Swiss Francs or Hong Kong Dollars. The New Credit Agreement reduces the interest rate margins for borrowings when compared to those under the Previous Credit Agreements by 25 basis points. Such interest rate margins are determined by reference to a pricing grid that is based on the level of borrowings outstanding under the New Credit Agreement. The New Credit Agreement is scheduled to mature on June 26, 2023.

The New Credit Agreement combines the previous Agency Credit Facility and previous SFS Credit Facility into one asset-based revolving credit facility with an aggregate borrowing capacity of $1.1 billion, which is subject to an enhanced borrowing base. The New Credit Agreement has a sub-limit of $350 million for foreign currency borrowings, as well as an accordion feature, which allows us to seek an increase to the borrowing capacity of the New Credit Agreement by an amount not to exceed $300 million in the aggregate. Though new commitments would need to be obtained, the uncommitted accordion feature permits us to seek an increase to the aggregate borrowing capacity under the New Credit Agreement pursuant to an expedited documentation process.

The borrowing base under the New Credit Agreement is determined by a calculation that is based upon, among other things, a percentage of: (i) eligible cash; (ii) the value of certain auction guarantee advances; (iii) the value of certain art inventory; (iv) the value of certain extended payment term receivables arising from auction or private sale transactions; (v) the value of certain loans in the SFS loan portfolio; (vi) the fair market value of certain eligible real property located in the U.K.; and (vii) the net orderly liquidation value of certain of our trademarks.

Domestic borrowers are jointly and severally liable for all obligations under the New Credit Agreement and, subject to certain limitations, borrowers in the U.K. and Sotheby's Hong Kong Limited, are jointly and severally liable for all obligations of the foreign borrowers under the New Credit Agreement. In addition, the obligations of the borrowers under the New Credit Agreement are guaranteed by certain of their subsidiaries. Our obligations under the New Credit Agreement are secured by liens on all or substantially all of the personal property of the entities that are borrowers and guarantors under the New Credit Agreement.

The New Credit Agreement contains certain customary affirmative and negative covenants including, but not limited to, limitations on indebtedness, liens, investments, restricted payments, and the use of proceeds from borrowings under the Credit Agreement. The New Credit Agreement also contains a limitation on net outstanding auction guarantees (i.e., auction guarantees less the impact of related risk sharing arrangements).

The New Credit Agreement permits dividend payments, common stock repurchases, investments and certain debt prepayments, so long as no event of default exists and subject to maintaining a minimum level of borrowing availability. The New Credit Agreement also contains certain financial covenants, which are only applicable during certain defined compliance periods. These financial covenants were not applicable for the twelve month period ended June 30, 2018.

We incurred aggregate fees of approximately $4 million in fees related to the New Credit Agreement, which are being amortized on a straight-line basis through its June 26, 2023 maturity date. As a result of this refinancing, $4 millionof unamortized fees related to the Previous Credit Agreements were written off in the second quarter of 2018.

The following tables summarize information related to our credit facilities as of and for the periods ended June 30, 2018, December 31, 2017, and June 30, 2017 (in thousands of dollars):

As of and for the periods ended	June 30, 2018		December 31, 2017		June 30, 2017
Maximum borrowing capacity (a)	$	1,100,000	$	1,100,000	$	1,335,000
Borrowing base	$	655,198	$	605,927	$	692,205
Borrowings outstanding (b)	$	63,000	$	196,500	$	531,500
Available borrowing capacity (c)	$	592,198	$	409,427	$	160,705
Average Borrowings Outstanding:
Three months ended June 30,	$	63,637	N/A		$	541,874
Six months ended June 30,	$	105,823	N/A		$	552,130
Year ended December 31,	N/A		$	479,367	N/A

(a) On October 2, 2017, we reduced the borrowing capacity of the previous SFS Credit Facility by $235 million. This reduction, which was entirely at our option and as part of our ongoing capital allocation analysis, was executed in order to reduce facility fees for unused borrowing capacity.

(b) The $63 million in borrowings outstanding under the New Credit Agreement as of June 30, 2018 were repaid in July 2018.

(c) The available borrowing capacity is calculated as the borrowing base less borrowings outstanding.

Borrowing costs under the Previous Credit Agreements related to the Agency segment, which include interest and fees, are reflected in our Condensed Consolidated Income Statements as Interest Expense. Borrowing costs under the Previous Credit Agreements related to SFS are reflected in our Condensed Consolidated Income Statements within Cost of Finance Revenues.

Long-Term Debt—As of June 30, 2018, December 31, 2017, and June 30, 2017, Long-Term Debt consisted of the following (in thousands of dollars):

	June 30, 2018			December 31, 2017			June 30, 2017
York Property Mortgage, net of unamortized debt issuance costs of $4,039, $4,545, and $5,050	$	267,082		$	270,556		$	305,907
2022 Senior Notes, net of unamortized debt issuance costs of $0, $2,998, and $3,320	—			297,002			296,680
2025 Senior Notes, net of unamortized debt issuance costs of $5,248, $5,623, and $0	394,752			394,377			—
Less current portion:
York Property Mortgage, net of unamortized debt issuance costs of $1,010, $1,010, and $1,010	(13,423		)	(11,930		)	(38,825		)
2022 Senior Notes, net of unamortized debt issuance costs of $0, $2,998, and $0	—			(297,002		)	—
Total Long-Term Debt, net	$	648,411		$	653,003		$	563,762

See the captioned sections below for information related to the York Property Mortgage, the 2022 Senior Notes, and the 2025 Senior Notes.

York Property Mortgage—The York Property, which is our headquarters building located at 1334 York Avenue in New York, is subject to a seven-year, $325 million mortgage loan (the "York Property Mortgage") that matures on July 1, 2022. As of June 30, 2018, the outstanding principal balance of the York Property Mortgage was $271.1 million. As of June 30, 2018, the fair value of the York Property Mortgage approximated its book value due to the variable interest rate associated with the mortgage. The fair value measurement is considered to be a Level 2 fair value measurement in the fair value hierarchy as per ASC 820, Fair Value Measurements.

The York Property Mortgage bears interest based on the one-month LIBOR rate plus a spread of 2.25% and is being amortized based on a 25-year mortgage-style amortization schedule over its seven-year term. On June 21, 2017, the York Property Mortgage was amended to reduce the minimum net worth that Sotheby's is required to maintain from $425 million to $325 million in order to provide continued flexibility regarding potential future common stock repurchases. As of June 30, 2018, Sotheby's net worth was $606.7 million. In conjunction with this amendment, on July 3, 2017, we made a prepayment of $32 million to reduce the outstanding principal balance of the York Property Mortgage, and agreed to make annual prepayments funded primarily with cash accumulated in a restricted cash management account, as discussed below, beginning in July 2018 and continuing through July 2021 that are not to exceed $25 million in the aggregate during that period. The $32 million principal payment made on July 3, 2017 was funded with $25 million from existing cash balances and $7 million from a restricted cash management account associated with the York Property Mortgage. On July 2, 2018, a $6.25 million principal payment funded primarily from the restricted cash management account was made in accordance with the June 2017 amendment to the York Property Mortgage. (See Note 9 for information related to the interest protection agreements that were entered into in connection with the York Property Mortgage.)

The York Property, the York Property Mortgage, and the related interest rate protection agreements are held by 1334 York, LLC (the "LLC"), a separate legal entity of Sotheby's that maintains its own books and records and whose results are ultimately consolidated into our Condensed Consolidated Financial Statements. The LLC is the sole owner and lessor of the York Property. The LLC presently leases the York Property to Sotheby's, Inc., which is also controlled by Sotheby's. The assets of the LLC are not available to satisfy the obligations of our other affiliates or any other entity.

The loan agreement governing the York Property Mortgage contains the following financial covenants, which are subject to additional terms and conditions as provided in the underlying loan agreement:

• As of July 1, 2020, the LTV ratio (i.e., the principal balance of the York Property Mortgage divided by the appraised value of the York Property) may not exceed 65% (the "Maximum LTV") based on the then-outstanding principal balance of the York Property Mortgage. If the LTV ratio exceeds the Maximum LTV, the LLC may, at its option, post cash or a letter of credit or pay down the York Property Mortgage without any prepayment penalty or premium, in an amount that will cause the LTV ratio not to exceed the Maximum LTV.

• At all times during the term of the York Property Mortgage, the Debt Yield will not be less than 8.5% (the "Minimum Debt Yield"). The Debt Yield is calculated by dividing the annual net operating income of the LLC, which primarily consists of lease income from Sotheby's, Inc. (calculated on a cash basis), by the outstanding principal balance of the York Property Mortgage. If the Debt Yield falls below the Minimum Debt Yield, the LLC has the option to post cash or a letter of credit or prepay the York Property Mortgage without any prepayment penalty or premium, in an amount that will cause the Debt Yield to exceed the Minimum Debt Yield.

• If Sotheby's corporate credit rating from Standard & Poor’s Rating Services ("S&P") is downgraded to "BB-", the lender may require that the LLC establish cash management accounts (the "Cash Management Accounts") under the lender's control for potential monthly debt service, insurance, and tax payments. If the rating is downgraded to "B+" or "B", the lender may require the LLC to deposit a certain amount of debt service into the Cash Management Accounts (approximately 6 and 12 months of debt service, respectively). If the rating is downgraded to lower than "B", the LLC must make principal payments on the mortgage such that the LTV ratio does not exceed 65%. On February 9, 2016, Sotheby's corporate credit rating from S&P was downgraded to "BB-" from "BB". As a result, a Cash Management Account was established under the control of the lender. The lender will retain any excess cash after monthly debt service, insurance, and taxes as security. On July 3, 2017, $7 million from the Cash Management Account was used to fund a portion of the $32 million principal prepayment of the York Property Mortgage discussed above. As of June 30, 2018, December 31, 2017, and June 30, 2017, the Cash Management Account had a balance of $5.3 million, $3.1 million, and $7.4 million, respectively, which is reflected within Restricted Cash on our Condensed Consolidated Balance Sheets.

• At all times during the term of the York Property Mortgage, we are required to maintain a net worth of at least $325 million, subject to a cure period.

Senior Unsecured Debt—On September 27, 2012, we issued $300 million aggregate principal amount of 5.25% Senior Notes, due October 1, 2022 (the "2022 Senior Notes"). On December 12, 2017, we issued$400 millionaggregate principal amount of4.875%Senior Notes due on December 15, 2025 (the “2025 Senior Notes”). The net proceeds from the issuance of the 2025 Senior Notes were approximately$395.5 million, after deducting fees paid to the initial purchasers, of which$312.3 millionwas irrevocably deposited with a trustee for the benefit of the holders of the 2022 Senior Notes, which were redeemed using these funds on January 11, 2018, as discussed below. The$312.3 milliondeposited with the trustee was classified within Restricted Cash on our Condensed Consolidated Balance Sheets as of December 31, 2017. The remaining net proceeds from the issuance of the 2025 Senior Notes were used for general corporate purposes, including reductions to revolving credit facility borrowings.

Interest on the 2025 Senior Notes is payable in cash semi-annually in arrears on June 15 and December 15 of each year, beginning June 15, 2018. The 2025 Senior Notes were offered only to qualified institutional buyers in accordance with Rule 144A and to non-U.S. Persons under Regulation S under the Securities Act of 1933, as amended (the "Securities Act"). Holders of the 2025 Senior Notes do not have registration rights, and the 2025 Senior Notes have not been and will not be registered under the Securities Act. The 2025 Senior Notes are guaranteed, jointly and severally, on a senior unsecured basis by certain of our existing and future domestic subsidiaries to the extent and on the same basis that such subsidiaries guarantee borrowings under the Credit Agreement. The 2025 Senior Notes will be redeemable, in whole or in part, on or after December 15, 2020, at specified redemption prices set forth in the underlying indenture, plus accrued and unpaid interest to, but excluding, the redemption date. Prior to December 15, 2020, the 2025 Senior Notes are redeemable, in whole or in part, at a redemption price equal to 100% of the principal amount of the 2025 Senior Notes to be redeemed, plus accrued and unpaid interest to, but excluding, the redemption date, plus a make-whole premium (as defined in the underlying indenture). In addition, at any time prior to December 15, 2020, we may redeem up to 40% of the aggregate principal amount of the 2025 Senior Notes with the net cash proceeds of certain equity offerings at the redemption price of 104.875% plus accrued and unpaid interest. If Sotheby's experiences a Change of Control (as defined in the underlying indenture), we must offer to repurchase all of the 2025 Senior Notes then outstanding at 101% of the aggregate principal amount of the 2025 Senior Notes repurchased, plus accrued and unpaid interest. The underlying indenture for the 2025 Senior Notes also contains customary covenants that limit, among other things, our ability to grant liens on our assets; enter into sale and leaseback transactions; and merge, consolidate or transfer or dispose of substantially all of our assets. The above covenants are subject to a number of exceptions and qualifications set forth in the underlying indenture.

As of June 30, 2018, the $400 million principal amount of the 2025 Senior Notes had a fair value of approximately $382.5 million based on a broker quoted price derived via a pricing model using observable and unobservable inputs. As such, this fair value measurement is considered to be a Level 3 fair value measurement in the fair value hierarchy as per ASC 820.

On January 11, 2018, we redeemed the 2022 Senior Notes for a redemption price of $312.3 million, including the $300 million principal amount plus $4.4 million of accrued interest and a call premium of $7.9 million. As a result of the redemption of the 2022 Senior Notes, we wrote-off $3 million of related unamortized debt issuance costs, which, when combined with the $7.9 million call premium, resulted in a total loss on the extinguishment of debt of $10.9 million recognized in the first quarter of 2018.

Future Principal and Interest Payments—The aggregate future principal and interest payments due under the New Credit Agreement, the York Property Mortgage, and the 2025 Senior Notes during the five-year period after June 30, 2018 are as follows (in thousands of dollars):

Period	Amount
July 2018 to June 2019	$	109,344
July 2019 to June 2020	$	47,174
July 2020 to June 2021	$	46,774
July 2021 to June 2022	$	46,371
July 2022 to June 2023	$	230,678

The table above assumes that the annual interest rate for the York Property Mortgage will be within the interest rate collar's floor and ceiling rates for the remainder of the mortgage term based on available forecasts of LIBOR rates for the future periods through maturity. The table above also assumes York Property Mortgage principal payments consistent with the related mortgage amortization schedule, as well as annual principal prepayments of $6.25 million each July beginning in 2018 and continuing through 2021, as discussed above.

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Derivative Financial Instruments

6 Months Ended

Jun. 30, 2018

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Derivative Financial Instruments

Derivative Financial Instruments

Derivative Financial Instruments Designated as Hedging Instruments—The following tables present fair value information related to the derivative financial instruments designated as hedging instruments as of June 30, 2018, December 31, 2017, and June 30, 2017 (in thousands of dollars):

	Assets			Liabilities
June 30, 2018	Balance Sheet Classification	Fair Value		Balance Sheet Classification		Fair Value
Cash Flow Hedges:
Interest rate swap	Other Current Assets	$	274	N/A		$	—
Interest rate collar	N/A	—		Other Current Liabilities		25
Interest rate collar	N/A	—		Other Long-Term Liabilities		207
Total cash flow hedges		274			—	232
Net Investment Hedges:
Foreign exchange contracts	Other Current Assets	4,444		N/A		—
Total		$	4,718			$	232

	Assets			Liabilities
December 31, 2017	Balance Sheet Classification	Fair Value		Balance Sheet Classification	Fair Value
Cash Flow Hedges:
Interest rate swap	Other Current Assets	$	339	N/A	$	—
Interest rate collar	N/A	—		Other Current Liabilities	666
Interest rate collar	N/A	—		Other Long-Term Liabilities	1,501
Total cash flow hedges		339			2,167
Net Investment Hedges:
Foreign exchange contracts	N/A	—		Other Current Liabilities	3,756
Total		$	339		$	5,923

	Assets			Liabilities
June 30, 2017	Balance Sheet Classification	Fair Value		Balance Sheet Classification	Fair Value
Cash Flow Hedges:
Interest rate swaps	Other Current Assets	$	308	N/A	$	—
Interest rate collar	N/A	—		Other Current Liabilities	1,550
Interest rate collar	N/A	—		Other Long-Term Liabilities	3,257
Total cash flow hedges		308			4,807
Net Investment Hedges:
Foreign exchange contracts	N/A	—		Other Current Liabilities	2,176
Total		$	308		$	6,983

During the six months ended June 30, 2018, we settled derivative financial instruments designated as net investment hedges with an aggregate notional value of $97.9 million and realized a net loss of ($5.9) million. During the six months ended June 30, 2017, we settled derivative financial instruments designated as net investment hedges with an aggregate notional value of $213.8 million and realized a net gain of $29.1 million. Realized gains and losses related to the settlement of derivative financial instruments designated as net investment hedges are reflected on our Condensed Consolidated Balance Sheets within Accumulated Other Comprehensive Loss.

The following tables summarize the effect of the derivative financial instruments designated as hedging instruments on our Condensed Consolidated Income Statements and Consolidated Condensed Statements of Comprehensive Income for the three and six months ended June 30, 2018 and 2017 (in thousands of dollars):

	Gain (Loss) Recognized in Other Comprehensive Income - Effective Portion					Classification of Gain (Loss) Reclassified from Accumulated Other Comprehensive Loss into Net Income	Amount Reclassified from Accumulated Other Comprehensive Loss into Net Income - Effective Portion						Amount Reclassified from Accumulated Other Comprehensive Loss into Net Income - Ineffective Portion
Three Months Ended June 30,	2018		2017				2018			2017			2018		2017
Cash Flow Hedges:
Interest rate swaps	$	15	$	(7	)	Interest Expense	$	(93	)	$	(50	)	$	—	$	—
Interest rate collar	207		(527		)	Interest Expense	7			—			—		—
Interest rate collar	—		—			Non-operating income	—			—			—		622
Total cash flow hedges	222		(534		)		(86		)	(50		)	—		622
Net Investment Hedges:
Foreign exchange contracts	3,350		(1,454		)	N/A	—			—			—		—
Total	$	3,572	$	(1,988	)		$	(86	)	$	(50	)	$	—	$	622

	Gain (Loss) Recognized in Other Comprehensive Income - Effective Portion					Classification of Gain (Loss) Reclassified from Accumulated Other Comprehensive Loss into Net Income	Amount Reclassified from Accumulated Other Comprehensive Loss into Net Income - Effective Portion					Amount Reclassified from Accumulated Other Comprehensive Loss into Net Income - Ineffective Portion
Six Months Ended June 30,	2018		2017				2018			2017		2018		2017
Cash Flow Hedges:
Interest rate swaps	$	95	$	134		Interest Expense	$	(145	)	$	35	$	—	$	—
Interest rate collar	1,187		85			Interest Expense	169			—		—		—
Interest rate collar	—		—			Non-operating income	—			—		—		622
Total cash flow hedges	1,282		219				24			35		—		622
Net Investment Hedges:
Foreign exchange contracts	1,740		(2,078		)	N/A	—			—		—		—
Total	$	3,022	$	(1,859	)		$	24		$	35	$	—	$	622

See the captioned sections below for information related to the derivative financial instruments designated as cash flow hedges or net investment hedges.

Derivative Financial Instruments Designated as Cash Flow Hedges—In connection with the York Property Mortgage (see Note 8), we entered into interest rate protection agreements secured by the York Property, consisting of a 2-year interest rate swap (the "Mortgage Swap"), effective as of July 1, 2015, and a 5-year interest rate collar (the "Mortgage Collar"), effective as of July 1, 2017. The Mortgage Swap fixed the LIBOR rate on the York Property Mortgage at an annual rate equal to 0.877% through its July 1, 2017 expiration date. The Mortgage Collar effectively fixes the LIBOR rate on the York Property Mortgage at an annual rate of no less than 1.917%, but no more than 3.75%, for the remainder of the mortgage's 7-year term. After taking into account the interest rate protection agreements, the annual interest rate for the first two years of the York Property Mortgage was approximately 3.127% and then will be between a floor of 4.167% and a cap of 6% for its remaining 7-year term. Beginning on the effective date of the Mortgage Collar and through June 30, 2018, the weighted average interest rate for the York Property Mortgage was 4.172%.

In conjunction and concurrent with the June 2017 amendment to the York Property Mortgage (see Note 8), the notional value of the Mortgage Collar was reduced by $57 million to reflect: (i) the $32 million principal prepayment made on the York Property Mortgage on July 3, 2017 and (ii) potential annual prepayments of $6.25 million each, beginning in July 2018 and continuing through July 2021. The reduction in the notional value of the Mortgage Collar relates to previously forecasted interest payments that are no longer probable of occurring following the June 2017 amendment to the York Property Mortgage. The reduction in the notional value of the Mortgage Collar resulted in a $0.6 million (net of tax) reclassification from Accumulated Other Comprehensive Loss into Net Income in the second quarter of 2017.

As of June 30, 2018, the notional value of the Mortgage Collar was $271.1 million, which is equal to the principal balance of the York Property Mortgage on that date. For the remainder of its term, the Mortgage Collar will have a notional value that is no greater than the applicable forecasted principal balance of the York Property Mortgage. The York Property, the York Property Mortgage, and the related interest rate protection agreement(s) are held by 1334 York, LLC, a separate legal entity of Sotheby's that maintains its own books and records and whose results are ultimately consolidated into our financial statements.

On November 21, 2016, we entered into a two-year interest rate swap agreement to eliminate the variability in expected cash outflows associated with the one-month LIBOR-indexed interest payments owed on $63 million of revolving credit facility borrowings (the "Revolving Credit Facility Swap"). As of June 30, 2018, the notional value of the Credit Facility Swap was $63 million.

At their inception, the Mortgage Swap, the Mortgage Collar, and the Revolving Credit Facility Swap (collectively, the "Cash Flow Hedges") were each individually designated as cash flow hedges of the risk associated with the variability in expected cash outflows related to the one-month LIBOR-indexed interest payments owed on their respective debt instruments. Accordingly, to the extent that each of the Cash Flow Hedges is effective, any unrealized gains and losses related to changes in their fair value are recorded to Accumulated Other Comprehensive Loss on our Condensed Consolidated Balance Sheets and then reclassified to Interest Expense in our Condensed Consolidated Income Statements in the same period that interest expense related to the underlying debt instruments is recorded. Any hedge ineffectiveness is immediately recognized in Net Income. In addition, if any of the forecasted transactions associated with the Cash Flow Hedges are no longer probable of occurring, any related amounts previously recorded in Accumulated Other Comprehensive Loss on our Condensed Consolidated Balance Sheets would be immediately reclassified into Net Income. As discussed above, certain previously forecasted interest payments associated with the Mortgage Collar became no longer probable of occurring in the second quarter of 2017 and, as a result, $0.6 million (net of tax) of the amount previously recorded in Accumulated Other Comprehensive Loss was immediately reclassified into Net Income in the second quarter of 2017.

Management performs a quarterly assessment to determine whether each of the outstanding Cash Flow Hedges continues to be highly effective in hedging the risk associated with the variability in expected cash outflows related to the one-month LIBOR-indexed interest payments on their respective debt instruments. As of June 30, 2018, each of the outstanding Cash Flow Hedges, including the Mortgage Collar, as amended, is expected to continue to be highly effective in hedging the risk associated with the variability in expected cash outflows related to the one-month LIBOR-indexed interest payments on their respective debt instruments.

The assets and liabilities associated with the Cash Flow Hedges have been designated as Level 2 fair value measurements within the fair value hierarchy provided by ASC 820. Level 2 fair value measurements have pricing inputs other than quoted prices in active markets, which are either directly or indirectly observable as of the reporting date. Level 2 fair value measurements may be determined through the use of models or other valuation methodologies. The fair value of the Mortgage Swap was based on a discounted cash flow methodology using the contractual terms of the instrument and observable LIBOR-curve rates that are consistent with the timing of the interest payments related to the York Property Mortgage. The fair value of the Mortgage Collar is based on an option pricing model using observable LIBOR-curve rates for each forecasted monthly settlement, with the projected cash flows discounted using the contractual terms of the instrument. The fair value of the Revolving Credit Facility Swap is based on a discounted cash flow methodology using the contractual terms of the instrument and observable LIBOR-curve rates that are consistent with the timing of the interest payments related to our revolving credit facility.

Derivative Financial Instruments Designated as Net Investment Hedges—We are exposed to variability in the U.S. Dollar equivalent of the net investments in our foreign subsidiaries and, by extension, the U.S. Dollar equivalent of any foreign earnings repatriated to the U.S. due to potential changes in foreign currency exchange rates. As a result, we regularly enter into foreign currency forward exchange contracts to hedge the net investments in our foreign subsidiaries from which we expect to repatriate earnings to the U.S. As of June 30, 2018, the aggregate notional value of our outstanding net investment hedge contracts was $56.3 million.

We use the forward rate method to assess the effectiveness of our net investment hedges. Under the forward rate method, if both the notional value of the derivative designated as a hedge of a net investment in a foreign subsidiary equals the portion of the net investment designated as being hedged and the derivative relates solely to the foreign exchange rate between the functional currency of the hedged net investment and the investor’s functional currency, then all changes in fair value of the derivative are reported in the cumulative translation adjustment accounts within Accumulated Other Comprehensive Loss on our Condensed Consolidated Balance Sheets.

The foreign currency forward exchange contracts designated as net investment hedges are considered Level 2 fair value measurements within the fair value hierarchy provided by ASC 820. Level 2 fair value measurements have pricing inputs other than quoted prices in active markets, which are either directly or indirectly observable as of the reporting date, and fair value may be determined through the use of models or other valuation methodologies. The fair value of these foreign currency forward exchange contracts is based on the estimated amount to settle the contracts using applicable market exchange rates as of the balance sheet date.

Derivative Financial Instruments Not Designated as Hedging Instruments—We also utilize forward contracts to hedge cash flow exposures related to foreign currency exchange rate movements arising from short-term foreign currency denominated intercompany balances and, to a much lesser extent, foreign currency denominated client payable balances, as well as foreign currency denominated auction guarantee obligations. Such forward exchange contracts are typically short-term with settlement dates less than six months from their inception. These instruments are not designated as hedging instruments for accounting purposes. Accordingly, changes in the fair value of these instruments are recognized in our Condensed Consolidated Income Statements in Non-Operating Income.

As of June 30, 2018, the notional value of outstanding forward exchange contracts not designated as hedging instruments was $251.9 million. Notional values do not quantify risk or represent assets or liabilities, but are used to calculate cash settlements under outstanding forward exchange contracts. We are exposed to credit-related risks in the event of nonperformance by the counterparties to our outstanding forward exchange contracts that are not designated as hedging instruments. We do not expect any of these counterparties to fail to meet their obligations, given their investment grade short-term credit ratings. As of June 30, 2018, the aggregate fair value of these contracts represented an asset of $3.7 million, which was recorded on our Condensed Consolidated Balance Sheets within Prepaid Expenses and Other Current Assets. As of December 31, 2017 and June 30, 2017, the aggregate fair value of these contracts represented liabilities of $0.8 million and $1.4 million, respectively, which were recorded on our Condensed Consolidated Balance Sheets within Accounts Payable and Accrued Liabilities.

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Sale of Pink Diamond

6 Months Ended

Jun. 30, 2018

Other Liabilities Disclosure [Abstract]

Sale of Pink Diamond

Sale of Pink Diamond

In the second quarter of 2016, we sold an undivided legal and beneficial 50% ownership interest in a Fancy Vivid Pink Diamond (the "Pink Diamond") held in Inventory for $34.2 million in cash, which was recorded on our Condensed Consolidated Balance Sheets within Other Current Liabilities. In April 2017, at our Magnificent Jewels and Jadeite Sale in Hong Kong (the "Auction"), the Pink Diamond was sold for a total purchase price of approximately $71.2 million (the "Purchase Price"). Although the Auction occurred in the second quarter of 2017, the sale was recognized in our financial statements in the third quarter of 2017 upon collection of the Purchase Price from the winning bidder in September 2017. Upon the collection of the Purchase Price, the $68.4 million carrying value of the Pink Diamond was removed from Inventory and the related $34.2 million cash payment received in the second quarter of 2016 was removed from Other Current Liabilities. The sale of the Pink Diamond resulted in a gain of approximately $0.4 million in 2017, after taking into account the associated Cost of Inventory Sales of $70.8 million, which includes amounts due to our partner in the Pink Diamond and other costs related to the sale.

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Supplemental Condensed Consolidated Balance Sheet Information

6 Months Ended

Jun. 30, 2018

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Supplemental Condensed Consolidated Balance Sheet Information

Supplemental Condensed Consolidated Balance Sheet Information

Prepaid and Other Current Assets—As of June 30, 2018, December 31, 2017, and June 30, 2017, Prepaid Expenses and Other Current Assets consisted of the following (in thousands of dollars):

	June 30, 2018		December 31, 2017		June 30, 2017
Prepaid expenses	$	25,586	$	25,418	$	27,293
Derivative financial instruments (see Note 9)	274		339		308
Insurance recoveries	2,335		—		—
Other	15,067		6,253		17,854
Total Prepaid Expenses and Other Current Assets	$	43,262	$	32,010	$	45,455

Other Long-Term Assets—As of June 30, 2018, December 31, 2017, and June 30, 2017, Other Long-Term Assets consisted of the following (in thousands of dollars):

	June 30, 2018		December 31, 2017		June 30, 2017
Defined benefit pension plan asset	$	107,647	$	108,826	$	86,317
Equity method investments (a)	46,789		46,905		47,299
Trust assets related to deferred compensation liability	30,017		26,240		25,128
Restricted cash (see Note 12)	17,442		17,916		17,332
Insurance recoveries	12,782		12,242		14,527
Other	15,136		15,479		2,392
Total Other Long-Term Assets	$	229,813	$	227,608	$	192,995

(a) Includes our equity method investments in RM Sotheby's and AMA, as well as a partnership that was formed in the second quarter of 2017 through which artworks are being purchased and sold.

Other Long-Term Liabilities—As of June 30, 2018, December 31, 2017, and June 30, 2017, Other Long-Term Liabilities consisted of the following (in thousands of dollars):

	June 30, 2018		December 31, 2017		June 30, 2017
Deferred compensation liability	$	29,605	$	25,614	$	24,477
Acquisition earn-out consideration	8,750		17,500		17,500
Interest rate collar liability (see Note 9)	207		1,501		3,257
Other	7,609		6,809		6,623
Total Other Long-Term Liabilities	$	46,171	$	51,424	$	51,857

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Supplemental Condensed Consolidated Cash Flow Information

6 Months Ended

Jun. 30, 2018

Supplemental Cash Flow Information [Abstract]

Supplemental Condensed Consolidated Cash Flow Information

Supplemental Condensed Consolidated Cash Flow Information

Cash, Cash Equivalents, and Restricted Cash—As of June 30, 2018, December 31, 2017, and June 30, 2017, cash, cash equivalents, and restricted cash consisted of the following (in thousands of dollars):

	June 30, 2018		December 31, 2017		June 30, 2017
Cash and cash equivalents	$	432,357	$	544,432	$	516,402
Restricted cash, recorded within current assets:
Consignor funds held in legally segregated accounts	23,528		46,029		33,164
Funds deposited with the trustee for the redemption of the 2022 Senior Notes (see Note 8)	—		312,250		—
Cash Management Account related to the York Property Mortgage (see Note 8)	5,264		3,107		7,434
Other	187		192		660
Restricted cash, recorded within current assets	28,979		361,578		41,258
Restricted cash, recorded within other long-term assets (a)	17,442		17,916		17,332
Total restricted cash	46,421		379,494		58,590
Cash, cash equivalents, and restricted cash	$	478,778	$	923,926	$	574,992

(a) Restricted cash reflected within Other Long-Term Assets principally relates to $15.3 million of funds held in escrow pending the final settlement of a sale.

Changes in Other Operating Assets and Liabilities—For the six months ended June 30, 2018 and 2017, changes in other operating assets and liabilities as reported in the Condensed Consolidated Statements of Cash Flows included the following (in thousands of dollars):

	Six Months Ended June 30,
	2018			2017
(Increase) decrease in:
Prepaid expenses and other current assets	$	(8,233	)	$	2,342
Other long-term assets	(3,611		)	(1,306		)
Income tax receivables and deferred income tax assets	(9,782		)	(20,896		)
(Decrease) increase in:
Accounts payable and accrued liabilities and other liabilities	(23,870		)	(20,575		)
Accrued income taxes and deferred income tax liabilities	4,126			(2,872		)
Total changes in other operating assets and liabilities	$	(41,370	)	$	(43,307	)

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Shareholders' Equity and Dividends

6 Months Ended

Jun. 30, 2018

Equity [Abstract]

Shareholders' Equity and Dividends

Shareholders' Equity and Dividends

Common Stock Repurchase Program—On February 28, 2018, the Board of Directors approved a $100 million increase to our share repurchase authorization, resulting in an updated share repurchase authorization of $195.7 million as of that date.

The following table provides information regarding our common stock repurchase program for the six months ended June 30, 2018 and 2017 (in thousands, except for per share data):

	Six Months Ended
	June 30, 2018		June 30, 2017
Shares repurchased	1,193		740
Aggregate purchase price	$	62,497	$	33,940
Average price per share	$	52.40	$	45.86

As of August 3, 2018, $133.2 million remained available under the current share repurchase authorization.

Management expects to continue to repurchase shares of common stock via open market purchases, purchases made pursuant to a Rule 10b5-1 plan, and/or accelerated share repurchase agreements, subject to the factors described below. The timing of further share repurchases and the actual amount purchased will depend on a variety of factors including the market price of our common stock, general market and economic conditions, securities law requirements, and other corporate considerations. Repurchases may continue to be made pursuant to plans intended to comply with Rule 10b5-1 under the Exchange Act, which allows us to purchase our shares during periods when we otherwise might be prevented from doing so under insider trading laws or because of self-imposed trading blackout periods. The repurchase authorization does not require the purchase of a specific number of shares and is subject to suspension or termination by our Board of Directors at any time.

Special Dividend—On January 29, 2014, the Board of Directors declared a special dividend of $300 million ($4.34 per share) that was paid on March 17, 2014. In conjunction with this special dividend, we accrued approximately $10 million for dividend equivalents owed on share-based payments to employees, which we charged to retained earnings. For the six months ended June 30, 2017, $2 million of such dividends were paid to employees upon the vesting of the share-based payments. No such dividends were paid during the six months ended June 30, 2018.

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Accumulated Other Comprehensive Loss

6 Months Ended

Jun. 30, 2018

Equity [Abstract]

Accumulated Other Comprehensive Loss

Accumulated Other Comprehensive Loss

The following is a summary of the changes in Accumulated Other Comprehensive Loss and the details regarding any reclassification adjustments made for the three and six months ended June 30, 2018 and 2017 (in thousands of dollars):

	Three Months Ended June 30,						Six Months Ended June 30,
	2018			2017			2018			2017
Currency Translation Adjustments
Balance at beginning of period	$	(67,280	)	$	(86,853	)	$	(74,505	)	$	(89,478	)
Other comprehensive (loss) income before reclassifications, net of tax of $0, $835, $400, and $1,421	(14,238		)	6,526			(7,013		)	9,151
Other comprehensive (loss) income	(14,238		)	6,526			(7,013		)	9,151
Balance at end of period	(81,518		)	(80,327		)	(81,518		)	(80,327		)
Cash Flow Hedges
Balance at beginning of period	141			(2,826		)	(1,029		)	(3,664		)
Other comprehensive income (loss) before reclassifications, net of tax of $73, ($331), $423, and $135	222			(534		)	1,282			219
Reclassifications from accumulated other comprehensive loss, net of tax of ($28), $354, $8, and $407	(86		)	572			24			657
Other comprehensive income	136			38			1,306			876
Balance at end of period	277			(2,788		)	277			(2,788		)
Net Investment Hedges
Balance at beginning of period	11,949			15,994			13,559			16,618
Other comprehensive income (loss) before reclassifications, net of tax of $1,094, ($885), $569, and ($1,270)	3,350			(1,454		)	1,740			(2,078		)
Other comprehensive income (loss)	3,350			(1,454		)	1,740			(2,078		)
Balance at end of period	15,299			14,540			15,299			14,540
Defined Benefit Pension Plan
Balance at beginning of period	(434		)	(13,855		)	(491		)	(13,834		)
Currency translation adjustments	32			(571		)	7			(800		)
Other comprehensive income (loss) before reclassifications	32			(571		)	7			(800		)
Prior service cost amortization, net of tax of ($4), ($3), ($8), and ($7)	(21		)	(20		)	(43		)	(39		)
Actuarial loss amortization, net of tax of $19, $45, $40, and $91	102			235			206			462
Reclassifications from accumulated other comprehensive loss, net of tax	81			215			163			423
Other comprehensive income (loss)	113			(356		)	170			(377		)
Balance at end of period	(321		)	(14,211		)	(321		)	(14,211		)
Total other comprehensive (loss) income attributable to Sotheby's	(10,639		)	4,754			(3,797		)	7,572
Accumulated other comprehensive loss as of June 30	$	(66,263	)	$	(82,786	)	$	(66,263	)	$	(82,786	)

	Three Months Ended June 30,						Six Months Ended June 30,
	2018			2017			2018			2017
Cash Flow Hedges
Settlements	$	(114	)	$	926		$	32		$	1,064
Tax effect	28			(354		)	(8		)	(407		)
Reclassification adjustments, net of tax	(86		)	572			24			657
Defined Benefit Pension Plan
Prior service cost amortization	(26		)	(23		)	(52		)	(46		)
Actuarial loss amortization	122			280			247			553
Pre-tax total	96			257			195			507
Tax effect	(15		)	(42		)	(32		)	(84		)
Reclassification adjustments, net of tax	81			215			163			423
Total reclassification adjustments, net of tax	$	(5	)	$	787		$	187		$	1,080

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Commitments and Contingencies

6 Months Ended

Jun. 30, 2018

Commitments and Contingencies Disclosure [Abstract]

Commitments and Contingencies

Commitments and Contingencies

Compensation Arrangements—We are party to compensation arrangements with certain senior employees, which expire at various points between March 31, 2020 and December 31, 2022. Such arrangements may provide, among other benefits, for minimum salary levels and for compensation under our incentive compensation programs that is payable only if specified Company and individual goals are attained. Additionally, under certain circumstances, certain of these arrangements provide annual share-based payments, severance payments, and other cash compensation. The aggregate remaining commitment for salaries and other cash compensation related to these compensation arrangements, excluding any participation in our incentive compensation programs, was approximately $14.1 million as of June 30, 2018.

Guarantees of Collection—A guarantee of collection is a commitment to a consignor that, under certain conditions, Sotheby's will fund the payment of the net sale proceeds to the consignor even if the purchaser has not yet made payment. It is not a guarantee that the property will be sold at a certain minimum price. In the event that any item subject to a guarantee of collection is sold and the purchaser does not pay by the settlement date, we are required to pay the consignor the net sale proceeds, but would then take title to the property and have the right to pursue the defaulting buyer and/or reoffer the property at a future sale. In certain limited circumstances, we may also have the right to recover the net sale proceeds from the consignor in the event of an ultimate purchaser default.As of June 30, 2018, we had a guarantee of collection outstanding related to property that sold for a hammer price of $26.8 million in April 2018. The remaining amount owed by the buyer is due to be paid in the fourth quarter of 2018.

Tax Contingencies—We are subject to laws and regulations in many countries involving sales, use, value-added and other indirect taxes which are assessed by various governmental authorities and imposed on certain revenue-producing transactions between us and our clients. The application of these laws and regulations to our unique business and global client base, and the estimation of any related liabilities, is complex and requires a significant amount of judgment. We are generally not responsible for these indirect tax liabilities unless we fail to collect the correct amount of sales, value-added, or other indirect taxes. Failure to collect the correct amount of indirect tax on a transaction may expose us to claims from tax authorities and could require us to record a liability and corresponding charge to our statement of operations.

Legal Contingencies—We become involved in various claims and lawsuits incidental to the ordinary course of our business. We are required to assess the likelihood of any adverse judgments or outcomes related to these legal contingencies, as well as potential ranges of probable or reasonably possible losses. The determination of the amount of any losses to be recorded or disclosed as a result of these contingencies is based on a careful analysis of each individual exposure with, in some cases, the assistance of outside legal counsel. The amount of losses recorded or disclosed for such contingencies may change in the future due to new developments in each matter or a change in settlement strategy. While the impact of any one or more legal claims or proceedings could be material to our operating results in any period, we do not believe that the outcome of any of these pending claims or proceedings, individually or in the aggregate, will have a material adverse effect on our consolidated financial condition.

On November 17, 2017, Sotheby’s, together with its London, Geneva and Vienna subsidiaries, and one of its employees (collectively, “the Sotheby’s Parties”), initiated a declaratory judgment action (requête en conciliation) in Switzerland (the “Swiss Action”), at the Tribunal de Première Instance de la République et Canton de Genève, against Dmitry Rybolovlev and various persons and entities affiliated with him. The Sotheby’s Parties’ action seeks a declaration that the Sotheby’s Parties owe no liability or debt to Mr. Rybolovlev and his affiliates in connection with sales of art and related services to entities affiliated with Mr. Yves Bouvier, as discussed in more detail below.     

The Sotheby’s Parties filed the Swiss Action in response to the stated intent of Mr. Rybolovlev’s counsel to initiate litigation in the U.K. against several of the Sotheby’s Parties. Specifically, on October 27, 2017, counsel for entities affiliated with Mr. Rybolovlev filed papers with the U.S. District Court for the Southern District of New York requesting authority to use documents previously obtained from Sotheby’s pursuant to 28 U.S.C. § 1782. This statute allows parties to conduct discovery in the U.S. for use in foreign legal proceedings. Mr. Rybolovlev sought discovery to support a contemplated U.K. proceeding alleging that Sotheby’s and its agents aided and abetted an alleged fraud that Mr. Bouvier allegedly perpetrated against Mr. Rybolovlev and affiliated entities. On December 22, 2017, the District Court in New York approved Mr. Rybolovlev’s request to use Sotheby’s previously disclosed documents both in the contemplated U.K. proceedings, and in the Sotheby’s Parties’ Swiss declaratory judgment proceeding against Mr. Rybolovlev and his affiliates. To date, we are not aware of Mr. Rybolovlev actually filing the threatened U.K. litigation against Sotheby’s, and believe that Geneva is the correct venue for the dispute, that the Lugano Convention effectively precludes Mr. Rybolovlev from sustaining an action in the U.K., and that the Sotheby’s Parties will prevail in the Swiss Action.

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Income Taxes

6 Months Ended

Jun. 30, 2018

Income Tax Disclosure [Abstract]

Income Taxes

Income Taxes

The U.S. Tax Cuts and Jobs Act (the “Act”) was signed into law on December 22, 2017. The Act includes significant changes to the U.S. corporate income tax system that became effective on January 1, 2018, including, among other things, (i) a reduction of the U.S. corporate income tax rate from 35% to 21%, (ii) the transition to a modified territorial tax system from a worldwide tax system, (iii) limitations on the deductibility of interest expense and executive compensation, (iv) the imposition of the Base Erosion Anti-Abuse Tax (“BEAT”), a new minimum tax on international payments meant to reduce the ability of multinational companies to erode the U.S. tax base through deductible payments to related parties, and (v) the creation of two new categories of income: (a) foreign-derived intangible income (“FDII”), which is income derived from the sale of property or services to a foreign person which may be taxed at a rate lower than 21%, and (b) global intangible low taxed income (“GILTI”), which is certain income earned by foreign subsidiaries that must be included in the income of the U.S. shareholder. In addition, the Act imposed a one-time transition tax in 2017 on the mandatory deemed repatriation of certain unremitted foreign earnings as of December 31, 2017.   

Soon after the Act was signed into law, the SEC issued Staff Accounting Bulletin No. 118 (“SAB 118"), which allows companies to record the income tax effects of the Act as a provisional amount based on reasonable estimates. The provisional amount is subject to adjustment as companies complete their analysis of the Act, and collect and prepare the necessary data, and interpret any additional guidance issued by the U.S. Treasury Department, IRS, the FASB, and other standard-setting and regulatory bodies. Any such adjustments may be made within a subsequent measurement period, which should not extend beyond one year from the enactment date.

In accordance with SAB 118, in the fourth quarter of 2017, we recorded a provisional net income tax expense of approximately $1.2 million based on reasonable estimates of the tax effects of the Act, which included an expense of $40.4 million to record a liability for the one-time mandatory transition tax on certain unremitted and untaxed earnings of our foreign subsidiaries. In the second quarter of 2018, we recorded an income tax benefit of approximately $2.3 million to reduce this liability as a result of guidance that was issued by the IRS during the period and as a result of revisions made to certain estimates used in the calculation as of December 31, 2017.

The provisional net income tax expense recorded in the fourth quarter of 2017 also included an expense of $19.8 million to reduce the value of our net deferred tax assets, primarily as a result of the change in the U.S. corporate income tax rate from 35% to 21%. In the second quarter of 2018, we recorded an income tax benefit of $2.6 million to adjust the remeasurement of our net deferred tax asset based on further analysis of available tax accounting methods and elections.

As of June 30, 2018, we are continuing to gather additional information and expect to complete our accounting for the tax effects of the Act within the prescribed measurement period, which will not exceed one year from the December 22, 2017 enactment date.

We are still evaluating the GILTI provisions of the Act in order to determine whether we will make an accounting policy election to recognize deferred taxes for temporary basis differences expected to reverse as GILTI income in future periods or to provide for the tax expense related to GILTI in the year in which the tax is incurred. Accordingly, no deferred taxes have been provided for GILTI income.

As of June 30, 2018, our Condensed Consolidated Balance Sheets reflect a provisional income tax payable of $20.2 million within long-term liabilities on our Condensed Consolidated Balance Sheets, for the one-time mandatory transition tax on unremitted foreign earnings discussed above. We intend to elect to settle this liability in installments over eight years, as allowed by the Act.

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Uncertain Tax Positions

6 Months Ended

Jun. 30, 2018

Income Tax Disclosure [Abstract]

Uncertain Tax Positions

Uncertain Tax Positions

As of June 30, 2018, our liability for unrecognized tax benefits, excluding interest and penalties, was $12.3 million, representing a net decrease of $0.9 million when compared to a liability of $13.2 million as of December 31, 2017. This net decrease is primarily the result of the expiration of the statute of limitations for certain tax years and the settlement of a tax audit, partially offset by the accrual of tax reserves related to transfer pricing and other U.S. federal and state and non-U.S. matters, and an increase due to changes in foreign exchange rates. As of June 30, 2017, our liability for unrecognized tax benefits, excluding interest and penalties, was $20.4 million.

As of June 30, 2018, December 31, 2017, and June 30, 2017, the total amount of unrecognized tax benefits that, if recognized, would favorably impact our effective income tax rate was $4.5 million, $4.1 million, and $9.6 million, respectively. We believe it is reasonably possible that a decrease of $2.6 million in the balance of unrecognized tax benefits can occur within 12 months of the June 30, 2018 balance sheet date as a result of the expiration of statutes of limitations and the expected settlement of ongoing tax audits.

We are subject to taxation in the U.S., as well as in various U.S. state and foreign jurisdictions. As a result, we are subject to tax audits in these jurisdictions. We are currently under examination by various U.S. state and foreign taxing authorities. The earliest open tax year for the major jurisdictions in which we do business, which includes the U.S. (including various state and local jurisdictions), the U.K., and Hong Kong, is 2011.

We recognize interest expense and penalties related to unrecognized tax benefits as a component of Income Tax Expense in our Condensed Consolidated Income Statements. For the three months ended June 30, 2018, the accrual of such interest and penalties increased by approximately $0.1 million.

Our policy is to record interest expense related to sales, value added and other non-income based taxes as Interest Expense in our Condensed Consolidated Income Statements. Penalties related to such taxes are recorded as General and Administrative Expenses in our Condensed Consolidated Income Statements . Interest expense and penalties related to income taxes are recorded as a component of Income Tax Expense in our Condensed Consolidated Income Statements.

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Auction Guarantees

6 Months Ended

Jun. 30, 2018

Guarantees [Abstract]

Auction Guarantees

Auction Guarantees

As of June 30, 2018, we had outstanding auction guarantees totaling $31.2 million. Each of the auction guarantees outstanding as of June 30, 2018 has a minimum guaranteed price that is within or below the range of the pre-sale auction estimates for the underlying property. All of the property related to these auction guarantees is being offered at auctions during the second half of 2018. Our financial exposure under these auction guarantees is reduced by $31.2 million as a result of our use of contractual risk sharing arrangements with third parties. Such risk sharing arrangements include irrevocable bid arrangements and, from time-to-time, partner sharing arrangements. As a result of these risk-sharing arrangements, we did not have any net financial exposure related to the auction guarantees that were outstanding as of June 30, 2018.

The counterparties to our auction guarantee risk sharing arrangements are typically major international art dealers or major art collectors. We could be exposed to losses in the event any of these counterparties do not perform according to the terms of these contractual arrangements.

Although risk sharing arrangements may be used to reduce the risk associated with auction guarantees, we may also enter into auction guarantees without securing such arrangements. In these circumstances, we could be exposed to deterioration in auction commission margins and/or auction guarantee losses if one or more of the guaranteed items fails to sell at its minimum guaranteed price. Furthermore, in such situations, our liquidity could be reduced.

(See Note 4 for additional information related to our use of auction guarantees and related risk sharing arrangements.)

We are obligated under the terms of certain auction guarantees to advance all or a portion of the guaranteed amount prior to auction. There were no auction guarantee advances outstanding as of June 30, 2018, December 31, 2017, and June 30, 2017. As of June 30, 2018, December 31, 2017, and June 30, 2017, the estimated fair value of our obligation to perform under our outstanding auction guarantees totaled $0.9 million, $0.9 million, and $0.4 million, respectively, and is recorded within Accounts Payable and Accrued Liabilities on our Condensed Consolidated Balance Sheets.

As of August 3, 2018, we had outstanding auction guarantees totaling $194 million and, as of that date, our financial exposure was reduced by risk-sharing arrangements totaling $81.2 million. As a result of these risk-sharing arrangements, our net financial exposure related to auction guarantees was $112.8 million as of August 3, 2018. Each of the auction guarantees outstanding as of August 3, 2018 has a minimum guaranteed price that is within or below the range of the pre-sale auction estimates for the underlying property. The property related to these auction guarantees is being offered at auctions during the second half of 2018 and throughout 2019. As of August 3, 2018, we have advanced $1 million of the total guaranteed amount.

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Share-Based Payments

6 Months Ended

Jun. 30, 2018

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Share-Based Payments

Share-Based Payments

Share-based payments made to employees include performance-based stock unit awards, market-based stock unit awards, restricted stock units, restricted shares, and stock options. Share-based payments are also made to members of our Board of Directors through the issuance of common stock and deferred stock units. A description of each of these share-based payments is provided below.

For the three and six months ended June 30, 2018 and 2017, compensation expense related to share-based payments was as follows (in thousands of dollars):

	Three Months Ended June 30,				Six Months Ended June 30,
	2018		2017		2018		2017
Pre-tax	$	6,312	$	5,946	$	14,689	$	12,015
After-tax	$	5,087	$	3,940	$	11,726	$	7,997

For the six months ended June 30, 2018 and 2017, we recognized $1.2 million and $2.6 million, respectively, in excess tax benefits related to share-based payments in our Condensed Consolidated Income Statements. These tax benefits represent the amount by which the tax deduction resulting from the vesting of share-based payments in the period exceeded the tax benefit initially recognized in our Condensed Consolidated Financial Statements.

As of June 30, 2018, unrecognized compensation expense related to the unvested portion of share-based payments to employees was $37.3 million. This compensation expense is expected to be amortized over a weighted-average period of approximately 2.25 years. We do not capitalize any compensation expense related to share-based payments to employees.

Shareholder Approval of 2018 Equity Incentive Plan—The Sotheby’s 2018 Equity Incentive Plan (the “Equity Plan”) was adopted by our Board of Directors on February 28, 2018 and approved by our stockholders on May 3, 2018. The Equity Plan replaces the Sotheby’s Restricted Stock Unit Plan (as amended and restated, the "Restricted Stock Unit Plan") and the Sotheby’s 1997 Stock Option Plan (collectively, the “Prior Plans”), which are discussed in more detail below. The Equity Plan permits the issuance of restricted stock, restricted stock units, performance shares, performance share units, stock options, stock appreciation rights (or, "SAR's"), and other equity-related awards. No further awards will be granted under the Prior Plans after May 3, 2018. However, the terms and conditions of the Prior Plans and related award agreements will continue to apply to all awards granted prior to May 3, 2018 under the Prior Plans.

The Equity Plan is a fungible share plan. Each option or SAR granted under the Equity Plan will count as one share from the available share pool. Each full-value award granted under the Equity Plan, including restricted stock units and performance share units, will count as 2.14 shares from the available pool.

Restricted Stock Unit Plan—Prior to May 3, 2018, the Restricted Stock Unit Plan provided for the issuance of restricted stock units ("RSU's") and restricted shares to employees. Awards made under the Restricted Stock Unit Plan were subject to the approval of the Compensation Committee of our Board of Directors. In making awards under the Restricted Stock Unit Plan, the Compensation Committee took into account the nature of the services rendered by employees, their present and potential future contributions to Sotheby's success, and such other factors as the Compensation Committee in its discretion deemed relevant.

RSU's and restricted shares issued under the Restricted Stock Unit Plan generally vest evenly over a three-year service period. Prior to vesting, holders of RSU's and restricted shares issued under the Restricted Stock Unit Plan are entitled to receive non-forfeitable dividend equivalents and dividends, respectively, at the same rate as dividends are paid on our common stock (if and when such dividends are paid). Prior to vesting, holders of RSU's issued under the Restricted Stock Unit Plan do not have voting rights, while holders of restricted shares have voting rights. RSU's and restricted shares may not be sold, assigned, transferred, pledged or otherwise encumbered until they vest.

For RSU's and restricted shares issued after May 3, 2018 under the new Equity Plan, dividend equivalents will generally be credited to holders of RSU's at the same rate as dividends are paid on our common stock (if and when such dividends are paid), but will only be paid for RSU's and restricted shares that vest.

Performance Share Units (or "PSU's") are RSU's that generally vest over three or four-year service periods, subject to the achievement of certain profitability targets (for awards granted prior to 2016) or certain return on invested capital ("ROIC") targets (for awards granted beginning in 2016). Prior to vesting, holders of PSU's do not have voting rights and are not entitled to receive dividends or dividend equivalents. Dividend equivalents are generally credited to holders of PSU's at the same rate as dividends are paid on our common stock (if and when such dividends are paid), but are only paid for PSU's that vest and become shares of our common stock. PSU's may not be sold, assigned, transferred, pledged or otherwise encumbered until they vest.

For the six months ended June 30, 2018, the Compensation Committee approved share-based payment awards with a total grant date fair value of $32.3 million, as follows:

• 283,019 PSU's with a grant date fair value of $13.2 million and a single vesting opportunity after a three-year service period. These PSU's provide the recipient with an opportunity to vest in incremental PSU's of up to 100% of the initial units awarded subject to the achievement of certain ROIC targets, for a total maximum vesting opportunity of 200% of the initial award. The maximum number of shares of common stock that may be payable with respect to these awards is 566,038.

• 402,899 RSU's with a grant date fair value of $19.1 million and annual vesting opportunities over a three-year service period.

Summary of Outstanding Share-Based Payment Awards—For the six months ended June 30, 2018, changes to the number of outstanding RSU’s, PSU’s, and restricted shares were as follows (shares in thousands):

	Restricted Shares, RSU's and PSU's		Weighted Average Grant Date Fair Value
Outstanding at January 1, 2018	1,922		$	36.59
Granted	686		$	47.06
Vested	(526	)	$	38.95
Canceled	(157	)	$	39.83
Outstanding at June 30, 2018	1,925		$	39.41

As of June 30, 2018, 6.2 million shares were available for future awards issued pursuant to the new Equity Plan. The aggregate fair value of RSU’s and PSU's that vested during the six months ended June 30, 2018 and 2017 was $26.8 million and $35.9 million, respectively, based on the closing stock price on the dates the shares vested.

Stock Options—Prior to the shareholder approval of the new Equity Plan on May 3, 2018, stock options were issued pursuant to the 1997 Stock Option Plan and were exercisable into authorized, but unissued shares of our common stock. These stock options vested evenly over four years and expired ten years after the date of grant. In the fourth quarter of 2017, the remaining 50,000 stock options that were outstanding under the 1997 Stock Option Plan were exercised at an exercise price of $22.11. As of June 30, 2018, there were no stock options outstanding or exercisable.

Directors Stock Plan—Common stock is issued quarterly under the Sotheby’s Stock Compensation Plan for Non-Employee Directors (as amended and restated, the “Directors Stock Plan”). Directors may elect to receive this compensation in the form of deferred stock units, which are credited in an amount that is equal to the number of shares of common stock the director otherwise would have received. The number of shares of common stock awarded is calculated using the closing price of the common stock on the New York Stock Exchange on the business day immediately prior to the quarterly grant date. Deferred stock units are held until a director’s termination of service, at which time the units are settled on a one-for one basis in shares of our common stock on the first day of the calendar month following the date of termination. For the three months ended June 30, 2018 and 2017, we recognized $0.3 million within General and Administrative Expenses in our Condensed Consolidated Income Statements related to common stock shares awarded under the Directors Stock Plan. For the six months ended June 30, 2018 and 2017, such expense was $0.6 million and $0.5 million, respectively. As of June 30, 2018,171,165deferred stock units were outstanding under the Directors Stock Plan and 104,467units were available for future issuance.

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Earnings Per Share

6 Months Ended

Jun. 30, 2018

Earnings Per Share [Abstract]

Earnings Per Share

Earnings Per Share

Basic earnings per share—Basic earnings per share attributable to Sotheby's common shareholders is computed under the two-class method using the weighted average number of common shares outstanding during the period. The two-class method requires that the amount of net income attributable to participating securities be deducted from consolidated net income in the computation of basic earnings per share. In periods with a net loss, the net loss attributable to participating securities is not deducted from consolidated net loss in the computation of basic loss per share as the impact would be anti-dilutive. Our participating securities include unvested restricted stock units and unvested restricted shares awarded to employees prior to May 3, 2018, both of which have non-forfeitable rights to dividends. See Note 19 for information on our share-based payment programs.

Diluted earnings per share—Diluted earnings per share attributable to Sotheby's common shareholders is computed in a similar manner to basic earnings per share under the two-class method, using the weighted average number of common shares outstanding during the period and, if dilutive, the weighted average number of potential common shares outstanding during the period. Our potential common shares principally include unvested performance share units held by employees and deferred stock units held by members of our Board of Directors. See Note 19 for information on our share-based payment programs.

The table below summarizes the computation of basic and diluted earnings per share for the three and six months ended June 30, 2018 and 2017 (in thousands, except per share amounts):

	Three Months Ended June 30,				Six Months Ended June 30,
	2018		2017		2018		2017
Basic:
Numerator:
Net income attributable to Sotheby’s	$	57,282	$	76,891	$	50,760	$	65,566
Less: Net income attributable to participating securities	844		1,176		763		1,019
Net income attributable to Sotheby’s common shareholders	$	56,438	$	75,715	$	49,997	$	64,547
Denominator:
Weighted average common shares outstanding	51,780		52,716		52,122		52,866
Basic earnings per share - Sotheby’s common shareholders	$	1.09	$	1.44	$	0.96	$	1.22
Diluted:
Numerator:
Net income attributable to Sotheby’s	$	57,282	$	76,891	$	50,760	$	65,566
Less: Net income attributable to participating securities	844		1,176		763		1,019
Net income attributable to Sotheby’s common shareholders	$	56,438	$	75,715	$	49,997	$	64,547
Denominator:
Weighted average common shares outstanding	51,780		52,716		52,122		52,866
Weighted average effect of dilutive potential common shares:
Performance share units	259		151		197		293
Deferred stock units	171		159		172		157
Stock options	—		28		—		26
Weighted average dilutive potential common shares outstanding	430		338		369		476
Weighted average diluted shares outstanding	52,210		53,054		52,491		53,342
Diluted earnings per share - Sotheby’s common shareholders	$	1.08	$	1.43	$	0.95	$	1.21

For the three and six months ended June 30, 2018 and 2017, approximately 1 million potential common shares related to share-based payments were excluded from the computation of diluted loss per share because the financial performance or stock price targets inherent in such awards were not achieved as of the respective balance sheet dates.

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Restructuring Charges

6 Months Ended

Jun. 30, 2018

Restructuring and Related Activities [Abstract]

Restructuring Charges

Restructuring Charges

For the three and six months ended June 30, 2018, we recognized $2.1 million in Restructuring Charges for severance related costs attributable to the elimination of certain senior level positions.

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Related Party Transactions

6 Months Ended

Jun. 30, 2018

Related Party Transactions [Abstract]

Related Party Transactions

Related Party Transactions

From time-to-time, in the ordinary course of business, related parties such as members of the Board of Directors and management, buy and sell property at our auctions or through private sales. For the three and six months ended June 30, 2018, our Condensed Consolidated Income Statements include Agency Commissions and Fees of $3.2 million and $3.4 million, respectively, attributable to transactions with related parties. For the six months ended June 30, 2018, our Condensed Consolidated Income Statements include Inventory Sales (and related cost of sales) of $5.3 million attributable to transactions with related parties. For the three and six months ended June 30, 2017, our Condensed Consolidated Income Statements include Agency Commissions and Fees of $1 million and $4.6 million attributable to transactions with related parties.

As of June 30, 2018, there was a related party receivable balance of $3.6 million. As of December 31, 2017 and June 30, 2017, there were no related party Accounts Receivable balances outstanding. As of June 30, 2018 and December 31, 2017, Client Payables included amounts owed to related party consignors totaling $0.4 million and $0.4 million, respectively. As of June 30, 2017, no amounts were owed to related party consignors.

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Recent Accounting Standards Not Yet Adopted

6 Months Ended

Jun. 30, 2018

Accounting Changes and Error Corrections [Abstract]

Recent Accounting Standards Not Yet Adopted

Recent Accounting Standards Not Yet Adopted

Leases—In February 2016, the FASB issued ASU 2016-02, Leases, which requires long-term lease arrangements to be recognized as assets and liabilities on the balance sheet of the lessee. Under ASU 2016-02, a right-of-use asset and lease obligation will be recorded for all long-term leases, whether operating or financing, while the statement of operations will reflect lease expense for operating leases and interest expense for financing leases. The amendments also require certain new quantitative and qualitative disclosures regarding leasing arrangements. ASU 2016-02 will be effective for us beginning on January 1, 2019. Our assessment of the impact of adopting ASU 2016-02 on our financial statements is ongoing. We have identified all material lease agreements and have chosen a lease management software solution to assist the adoption process.

Credit Losses—In June 2016, the FASB issued ASU 2016-13, Measurement of Credit Losses on Financial Instruments, which amends previously issued guidance regarding the impairment of financial instruments by creating an impairment model that is based on expected losses rather than incurred losses. ASU 2016-13 is effective for us beginning on January 1, 2020. We are currently assessing the potential impact of adopting ASU 2016-13 on our financial statements.

Goodwill—In January 2017, the FASB issued ASU 2017-04, Simplifying the Test for Goodwill Impairment, which eliminates the requirement to calculate the implied fair value of goodwill to measure a goodwill impairment charge. Instead, entities will record an impairment charge based on the excess of a reporting unit's carrying amount over its fair value. ASU 2017-04 is effective for us beginning on January 1, 2020. We do not expect the adoption of ASU 2017-04 to have a material impact on our financial statements.

Derivatives—In August 2017, the FASB issued ASU 2017-12, Derivatives and Hedging: Targeted Improvements to Accounting for Hedging Activities, which provides targeted guidance regarding the accounting for hedging activities to better align an entity’s risk management activities and financial reporting for hedging relationships through changes to both the designation and measurement guidance for qualifying hedging relationships and the presentation of hedge results. ASU 2017-12 is effective for us beginning on January 1, 2019. We are currently assessing the potential impact of adopting ASU 2017-12 on our financial statements.

Accumulated Comprehensive Income—On February 14, 2018, the FASB issued ASU 2018-02 to address industry concerns related to the application of ASC 740, Income Taxes, to certain provisions of the U.S. Tax Cuts and Jobs Act. Specifically, some constituents in the banking and insurance industries had expressed concerns about the requirement in ASC 740 that the effect of a change in tax laws or rates on deferred tax assets and liabilities be included in income from continuing operations in the reporting period that contains the enactment date of the change. That guidance applies even in situations in which the tax effects were initially recognized directly in other comprehensive income at the previous rate, resulting in stranded amounts in accumulated other comprehensive income ("AOCI") related to the income tax rate differential. Upon adopting ASU 2018-02, an entity is required to disclose:

• Its accounting policy related to releasing income tax effects from AOCI;

• Whether it has elected to reclassify, to retained earnings in the statement of stockholders’ equity, the stranded tax effects in AOCI related to the Act; and

• If it has elected to reclassify to retained earnings the stranded tax effects in AOCI related to the Act, what the reclassification encompasses (i.e., whether it only includes the change in the federal corporate tax rate or whether it also includes other changes resulting from the Act that affect AOCI).

The guidance in ASU 2018-02 is effective for fiscal years beginning after December 15, 2018, including interim periods therein. An entity will apply this guidance to each period in which the effect of the Act (or portion thereof) is recorded and may apply it either (1) retrospectively as of the date of enactment or (2) as of the beginning of the period of adoption. We are currently evaluating the potential impact of adopting ASU 2018-02 on our financial statements.

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Basis of Presentation (Policies)

6 Months Ended

Jun. 30, 2018

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Adjustments to Prior Period Presentation and Other Recently Issued Accounting Standards

Revenue Recognition—In May 2014, the Financial Accounting Standards Board (the "FASB") issued an Accounting Standards Update ("ASU") which amends revenue recognition guidance and requires more detailed disclosures to enable users of financial statements to understand the nature, amount, timing, and uncertainty of revenue and cash flows arising from contracts with customers. This ASU is codified in U.S. GAAP under Accounting Standards Codification ("ASC") 606, Revenue from Contracts with Customers.

We adopted ASC 606 on January 1, 2018 using the full retrospective method. The adoption of ASC 606 did not impact the timing of our revenue recognition, but it changed the presentation of certain revenues and expenses previously reported on a net basis in our Condensed Consolidated Income Statements. Specifically, the following items previously reported on a net basis within Agency Commissions and Fees are now reported on a gross basis within Agency Direct Costs: (i) fees owed to the counterparties in auction guarantee risk sharing arrangements and (ii) fees owed to third parties who introduce us to auction or private sale consignors. In addition, consignor expense recoveries and buyer shipping fees previously reported on a net basis within Agency Direct Costs are now reported on a gross basis within Agency Commission and Fees. The table below under "Summary of Adjustments to Prior Period Presentation" shows the impact of the retrospective adoption of ASC 606 on our Condensed Consolidated Income Statements for the three and six months ended June 30, 2017.

Statement of Cash Flows—In August 2016, the FASB issued ASU 2016-15, Statement of Cash Flows, which updated the guidance on how certain cash receipts and cash payments should be presented and classified within the statement of cash flows. We retrospectively adopted ASU 2016-15 on January 1, 2018. The adoption of ASU 2016-15 changed how we classify cash proceeds received from our investment in company-owned life insurance ("COLI"), which is held in a rabbi trust and used to fund certain deferred compensation liabilities. Prior to the adoption of ASU 2016-15, COLI proceeds were classified as cash inflows from operating activities, but are now classified as cash inflows from investing activities. The adoption of ASU 2016-15 also required us to make certain accounting policy elections with respect to the statement of cash flows. First, ASU 2016-15 clarifies that COLI premiums paid may be classified as cash outflows from operating or investing activities, or a combination of both. In connection with the adoption of ASU 2016-15, we made an accounting policy election to classify COLI premiums paid as cash outflows from operating activities, consistent with our previous presentation of such payments. Second, ASU 2016-15 allows distributions received from equity method investees to be classified using either the cumulative earnings approach or the nature of distribution approach. In connection with the adoption of ASU 2016-15, we made an accounting policy election to classify distributions received from equity method investees using the cumulative earnings approach, consistent with our previous presentation of such distributions. The other aspects of ASU 2016-15 did not result in a change to our existing accounting policies for the preparation of the statement of cash flows. The table below under "Summary of Adjustments to Prior Period Presentation" shows the impact of our retrospective adoption of ASU 2016-15 on our Condensed Consolidated Statements of Cash Flows for the six months ended June 30, 2017.

In November 2016, the FASB issued ASU 2016-18, Statement of Cash Flows, to add and clarify guidance on the classification and presentation of restricted cash and restricted cash equivalents in the statement of cash flows. In particular, ASU 2016-18 requires that restricted cash and restricted cash equivalents be included within cash and cash equivalents when reconciling the beginning-of-period and end-of-period totals disclosed in the statement of cash flows. Transfers between restricted and unrestricted cash accounts are not to be reported within the statement of cash flows. Only restricted cash receipts or payments directly with third parties are to be reported in the statement of cash flows as either an operating, investing, or financing activity, depending on the nature of the transaction. We retrospectively adopted ASU 2016-18 on January 1, 2018. The table below under "Summary of Adjustments to Prior Period Presentation" shows the impact of our retrospective adoption of ASU 2016-18 on our Condensed Consolidated Statements of Cash Flows for the six months ended June 30, 2017. (See Note 11 for information related to our restricted cash balances.)

Presentation of Pension and Postretirement Costs—In March 2017, the FASB issued ASU 2017-07, Improving the Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Cost, which requires that the service cost component of net periodic pension cost be presented in the same statement of operations line item as other employee compensation costs, while the remaining components of net periodic pension cost be presented outside of operating income (loss). We retrospectively adopted ASU 2017-07 on January 1, 2018. The table below under "Summary of Adjustments to Prior Period Presentation" shows the impact of our retrospective adoption of ASU 2017-07 on our Condensed Consolidated Income Statements for the three and six months ended June 30, 2017. (See Note 7 for information related to our defined benefit pension plan in the U.K.)

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Basis of Presentation (Tables)

6 Months Ended

Jun. 30, 2018

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Schedule of New Accounting Pronouncements

The following table summarizes the impact of the retrospective adoption of ASC 606 and ASU 2017-07 on our Condensed Consolidated Income Statements for the three and six months ended June 30, 2017 (in thousands of dollars):

Three months ended June 30, 2017	As Previously Reported			ASC 606 Adjustment		ASU 2017-07 Adjustment			As Adjusted
Revenues:
Agency commissions and fees	$	276,807		$	24,961	$	—		$	301,768
Total revenues	$	314,898		$	24,961	$	—		$	339,859
Expenses:
Agency direct costs	$	29,881		$	24,961	$	—		$	54,842
Salaries and related	$	87,297		$	—	$	1,243		$	88,540
Total expenses	$	199,500		$	24,961	$	1,243		$	225,704
Operating income	$	115,398		$	—	$	(1,243	)	$	114,155
Non-operating (expense) income	$	(299	)	$	—	$	1,243		$	944
Net income attributable to Sotheby's	$	76,891		$	—	$	—		$	76,891

Six months ended June 30, 2017	As Previously Reported		ASC 606 Adjustment		ASU 2017-07 Adjustment			As Adjusted
Revenues:
Agency commissions and fees	$	376,300	$	36,733	$	—		$	413,033
Total revenues	$	502,435	$	36,733	$	—		$	539,168
Expenses:
Agency direct costs	$	39,398	$	36,733	$	—		$	76,131
Salaries and related	$	151,643	$	—	$	2,447		$	154,090
Total expenses	$	399,891	$	36,733	$	2,447		$	439,071
Operating income	$	102,544	$	—	$	(2,447	)	$	100,097
Non-operating income	$	541	$	—	$	2,447		$	2,988
Net income attributable to Sotheby's	$	65,566	$	—	$	—		$	65,566

The following table summarizes the impact of the retrospective adoption of ASU 2016-15 and ASU 2016-18 on our Condensed Consolidated Statement of Cash Flows for the six months ended June 30, 2017 (in thousands of dollars):

	As Previously Reported			ASU 2016-15 Adjustments			ASU 2016-18 Adjustments			As Adjusted
Operating Activities:
Changes in other operating assets and liabilities	$	(41,207	)	$	(2,100	)	$	—		$	(43,307	)
Net cash provided by operating activities	$	56,357		$	(2,100	)	$	—		$	54,257
Investing Activities:
Proceeds from company-owned life insurance	$	—		$	2,100		$	—		$	2,100
Decrease in restricted cash	$	7,749		$	—		$	(7,749	)	$	—
Net cash provided by investing activities	$	50,545		$	2,100		$	(7,749	)	$	44,896
Financing Activities:
Increase in restricted cash related to York Property Mortgage	$	(2,799	)	$	—		$	2,799		$	—
Net cash used by financing activities	$	(91,020	)	$	—		$	2,799		$	(88,221	)
Effect of exchange rate changes on cash, cash equivalents, and restricted cash	$	4,489		$	—		$	3,370		$	7,859
Increase (decrease) in cash, cash equivalents, and restricted cash (a)	$	20,371		$	—		$	(1,580	)	$	18,791
Cash, cash equivalents, and restricted cash at beginning of period (a)	$	496,031		$	—		60,170			$	556,201
Cash, cash equivalents, and restricted cash at end of period (a)	$	516,402		$	—		$	58,590		$	574,992

(a) Restricted cash is included only in the adjusted balances, reflecting the retrospective adoption of ASU 2016-18.

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Segment Reporting (Tables)

6 Months Ended

Jun. 30, 2018

Segment Reporting [Abstract]

Schedule of Segment Information

The following table presents our segment information for the three and six months ended June 30, 2018 and 2017 (in thousands of dollars):

Three Months Ended June 30, 2018	Agency		SFS		All Other		Reconciling items				Total
Revenues	$	327,445	$	11,823	$	8,550	$	(2,182	)	(a)	$	345,636
Segment income before taxes	$	67,173	$	6,891	$	1,051	$	(1,234	)	(b)	$	73,881
Three Months Ended June 30, 2017
Revenues (c)	$	319,474	$	16,362	$	7,026	$	(3,003	)	(a)	$	339,859
Segment income before taxes	$	97,226	$	8,879	$	2,255	$	(466	)	(b)	$	107,894
Six Months Ended June 30, 2018
Revenues	$	507,178	$	24,239	$	14,732	$	(4,717	)	(a)	$	541,432
Segment income before taxes	$	57,467	$	15,402	$	2,439	$	(12,895	)	(b)	$	62,413
Six Months Ended June 30, 2017
Revenues (c)	$	499,665	$	30,733	$	13,377	$	(4,607	)	(a)	$	539,168
Segment income before taxes	$	68,804	$	16,212	$	4,721	$	(1,133	)	(b)	$	88,604

(a) The reconciling items related to revenues consist principally of amounts charged by SFS to the Agency segment, including interest and facility fees related to certain loans made to Agency segment clients, as well as fees charged for term loan collateral sold at auction or privately through the Agency segment.

(b) The reconciling items related to segment income before taxes are detailed in the table below.

(c) Agency segment revenue for the three and six months ended June 30, 2017 has been recast to reflect the retrospective adoption of ASC 606. See Notes 1 and 4.

Reconciliation of Segment (Loss) Income Before Taxes

The table below presents a reconciliation of total segment income before taxes to consolidated income before taxes for the three and six months ended June 30, 2018 and 2017 (in thousands of dollars):

	Three Months Ended June 30,						Six Months Ended June 30,
	2018			2017			2018			2017
Agency	$	67,173		$	97,226		$	57,467		$	68,804
SFS	6,891			8,879			15,402			16,212
All Other	1,051			2,255			2,439			4,721
Segment income before taxes	75,115			108,360			75,308			89,737
Unallocated amounts and reconciling items:
Extinguishment of debt	—			—			(10,855		)	—
Equity in earnings of investees (a)	(1,234		)	(466		)	(2,040		)	(1,133		)
Income before taxes	$	73,881		$	107,894		$	62,413		$	88,604

(a) For segment reporting purposes, our share of earnings related to equity investees is included as part of income before taxes. However, such earnings are reported separately below income before taxes in our Condensed Consolidated Income Statements.

Reconciliation of Segment Assets to Consolidated Assets

The table below presents segment assets, as well as a reconciliation of segment assets to consolidated assets as of June 30, 2018, December 31, 2017, and June 30, 2017 (in thousands of dollars):

	June 30, 2018		December 31, 2017		June 30, 2017
Agency	$	2,227,296	$	2,395,429	$	2,130,731
SFS	494,420		608,713		663,500
All Other	43,625		40,566		48,051
Total segment assets	2,765,341		3,044,708		2,842,282
Unallocated amounts and reconciling items:
Deferred tax assets and income tax receivable	46,326		42,599		23,096
Reconciling item related to SFS (a)	—		—		(25,000		)
Consolidated assets	$	2,811,667	$	3,087,307	$	2,840,378

(a) As of June 30, 2017, segment assets for SFS included a $25 million consignor advance that is netted against an associated auction payable balance on our Condensed Consolidated Balance Sheets.

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Revenues (Tables)

6 Months Ended

Jun. 30, 2018

Revenue from Contract with Customer [Abstract]

Schedule of Revenue by Segment

for information regarding the retrospective adoption of ASC 606.)

The following table summarizes our revenues by segment and type for the three and six months ended June 30, 2018 and 2017 (in thousands of dollars):

	Three Months Ended June 30, 2018								Three Months Ended June 30, 2017
	Agency		SFS		All Other		Total		Agency		SFS		All Other			Total
Revenue from contracts with customers:
Agency commissions and fees:
Auction commissions	$	257,799	$	—	$	—	$	257,799	$	266,949	$	—	$	—		$	266,949
Auction related fees, net (a)	6,081		—		—		6,081		16,045		—		—			16,045
Private sale commissions	24,016		—		500		24,516		14,827		—		—			14,827
Other Agency commissions and fees	2,359		—		124		2,483		3,947		—		—			3,947
Total Agency commissions and fees	290,255		—		624		290,879		301,768		—		—			301,768
Inventory sales	37,190		—		2,916		40,106		17,706		—		2,231			19,937
Advisory revenues	—		—		1,156		1,156		—		—		1,431			1,431
License fee and other revenues	—		—		3,854		3,854		—		—		3,364			3,364
Total revenue from contracts with customers	327,445		—		8,550		335,995		319,474		—		7,026			326,500
Finance revenue:
Interest and related fees	—		9,641		—		9,641		—		13,359		—		9,881	13,359
Total revenues	$	327,445	$	9,641	$	8,550	$	345,636	$	319,474	$	13,359	$	7,026		$	339,859

	Six Months Ended June 30, 2018										Six Months Ended June 30, 2017
	Agency			SFS			All Other		Total		Agency			SFS			All Other		Total
Revenue from contracts with customers:
Agency commissions and fees:
Auction commissions	$	389,929	—	$	—	—	$	—	$	389,929	$	357,565	—	$	—	—	$	—	$	357,565
Auction related fees, net (a)	17,824		—	—		—	—		17,824		21,498		—	—		—	—		21,498
Private sale commissions	43,501		—	—		—	500		44,001		28,047		—	—		—	—		28,047
Other Agency commissions and fees	4,351		—	—		—	300		4,651		5,923		—	—		—	—		5,923
Total Agency commissions and fees	455,605			—			800		456,405		413,033			—			—		413,033
Inventory sales	51,573		—	—		—	4,769		56,342		86,632			—			4,682		91,314
Advisory revenues	—		—	—		—	2,406		2,406		—		—	—		—	2,829		2,829
License fee and other revenues	—		—	—		—	6,757		6,757		—		—	—		—	5,866		5,866
Total revenue from contracts with customers	507,178			—			14,732		521,910		499,665			—			13,377		513,042
Finance revenue:
Interest and related fees	—		—	19,522		—	—		19,522		—		—	26,126		—	—		26,126
Total revenues	$	507,178		$	19,522		$	14,732	$	541,432	$	499,665		$	26,126		$	13,377	$	539,168

(a) Auction Related Fees, net includes the net overage or shortfall attributable to auction guarantees, consignor expense recoveries, and shipping fees charged to buyers.

Schedule of Contract with Customer

The table below summarizes the balances related to our contracts with customers as of and for the six months ended June 30, 2018 and 2017 (in thousands of dollars):

	June 30, 2018		June 30, 2017
Accounts Receivable
Balance as of beginning of period	$	783,706	$	424,418
Balance as of end of period	$	1,076,152	$	837,200
Increase/(decrease)	$	292,446	$	412,782
Client Payables
Balance as of beginning of period	$	996,197	$	511,876
Balance as of end of period	$	1,191,581	$	867,856
Increase/(decrease)	$	195,384	$	355,980

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Notes Receivable (Tables)

6 Months Ended

Jun. 30, 2018

Receivables [Abstract]

Schedule of Aggregate LTV Ratio

The table below provides the aggregate LTV ratio for the SFS loan portfolio as of June 30, 2018, December 31, 2017, and June 30, 2017 (in thousands of dollars):

	June 30, 2018			December 31, 2017			June 30, 2017
Secured loans	$	479,972		$	590,609		$	651,361
Low auction estimate of collateral	$	1,159,693		$	1,369,235		$	1,445,847
Aggregate LTV ratio	41		%	43		%	45		%

The table below provides the aggregate LTV ratio for secured loans made by SFS with an LTV ratio above 50% as of June 30, 2018, December 31, 2017, and June 30, 2017 (in thousands of dollars):

	June 30, 2018			December 31, 2017			June 30, 2017
Secured loans with an LTV ratio above 50%	$	105,744		$	168,116		$	209,483
Low auction estimate of collateral related to secured loans with an LTV ratio above 50%	$	182,398		$	269,063		$	375,933
Aggregate LTV ratio of secured loans with an LTV ratio above 50%	58		%	62		%	56		%

Schedule of Other Credit Quality Information

The table below provides other credit quality information regarding secured loans made by SFS as of June 30, 2018, December 31, 2017, and June 30, 2017 (in thousands of dollars):

	June 30, 2018		December 31, 2017		June 30, 2017
Total secured loans	$	479,972	$	590,609	$	651,361
Loans past due	$	62,310	$	62,570	$	108,560
Loans more than 90 days past due	$	41,819	$	56,087	$	41,448
Non-accrual loans	$	15,402	$	—	$	—
Impaired loans	$	—	$	—	$	—
Allowance for credit losses:
Allowance for credit losses for impaired loans	$	—	$	—	$	—
Allowance for credit losses based on historical data	1,132		1,253		1,290
Total allowance for credit losses - secured loans	$	1,132	$	1,253	$	1,290

Schedule of Activity Related to Allowance for Credit Losses

Allowance for Credit Losses—During the period January 1, 2018 to June 30, 2018, activity related to the Allowance for Credit Losses by segment was as follows (in thousands of dollars):

	SFS			Agency		Total
Balance as of January 1, 2018	$	1,253		$	1,525	$	2,778
Change in loan loss provision based on historical data	(121		)	—		(121		)
Balance as of June 30, 2018	$	1,132		$	1,525	$	2,657

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Goodwill and Intangible Assets (Tables)

6 Months Ended

Jun. 30, 2018

Goodwill and Intangible Assets Disclosure [Abstract]

Schedule of Goodwill

For the six months ended June 30, 2018 and 2017, changes in the carrying value of Goodwill were as follows (in thousands of dollars):

	Six Months Ended June 30, 2018								Six Months Ended June 30, 2017
	Agency			All Other		Total			Agency		All Other		Total
Beginning balance as of January 1	$	44,396		$	6,151	$	50,547		$	43,878	$	6,151	$	50,029
Goodwill acquired	5,259			—		5,259			—		—		—
Foreign currency exchange rate changes	(136		)	—		(136		)	322		—		322
Ending balance as of June 30	$	49,519		$	6,151	$	55,670		$	44,200	$	6,151	$	50,351

Schedule of Indefinite-Lived Intangible Assets

As of June 30, 2018, December 31, 2017, and June 30, 2017, intangible assets consisted of the following (in thousands of dollars):

	Amortization Period	June 30, 2018			December 31, 2017			June 30, 2017
Indefinite lived intangible assets:
License (a)	N/A	$	324		$	324		$	324
Intangible assets subject to amortization:
Customer relationships - Art Advisory Partners	8 years	10,800			10,800			10,800
Non-compete agreements - Art Advisory Partners	6 years	3,060			3,060			3,060
Artworks database (b)	10 years	1,200			1,200			1,125
Technology	4 years	4,461			—			—
Total intangible assets subject to amortization		19,521			15,060			14,985
Accumulated amortization		(5,232		)	(3,892		)	(2,902		)
Total amortizable intangible assets (net)		14,289			11,168			12,083
Total intangible assets (net)		$	14,613		$	11,492		$	12,407

(a) Relates to a license obtained in conjunction with the purchase of a retail wine business in 2008.

(b) Relates to a database containing historic information concerning repeat sales of works of art. This database was acquired along with the associated business in exchange for an initial cash payment made in the third quarter of 2016 and a subsequent cash payment made in the third quarter of 2017.

Schedule of Finite-lived Intangible Assets

As of June 30, 2018, December 31, 2017, and June 30, 2017, intangible assets consisted of the following (in thousands of dollars):

	Amortization Period	June 30, 2018			December 31, 2017			June 30, 2017
Indefinite lived intangible assets:
License (a)	N/A	$	324		$	324		$	324
Intangible assets subject to amortization:
Customer relationships - Art Advisory Partners	8 years	10,800			10,800			10,800
Non-compete agreements - Art Advisory Partners	6 years	3,060			3,060			3,060
Artworks database (b)	10 years	1,200			1,200			1,125
Technology	4 years	4,461			—			—
Total intangible assets subject to amortization		19,521			15,060			14,985
Accumulated amortization		(5,232		)	(3,892		)	(2,902		)
Total amortizable intangible assets (net)		14,289			11,168			12,083
Total intangible assets (net)		$	14,613		$	11,492		$	12,407

(a) Relates to a license obtained in conjunction with the purchase of a retail wine business in 2008.

(b) Relates to a database containing historic information concerning repeat sales of works of art. This database was acquired along with the associated business in exchange for an initial cash payment made in the third quarter of 2016 and a subsequent cash payment made in the third quarter of 2017.

Schedule of Estimated Aggregate Amortization Expense

The estimated aggregate amortization expense for the remaining useful lives of intangible assets subject to amortization during the five-year period succeeding the June 30, 2018 balance sheet date are as follows (in thousands of dollars):

Period	Amount
July 2018 to June 2019	$	3,095
July 2019 to June 2020	$	3,095
July 2020 to June 2021	$	3,095
July 2021 to June 2022	$	2,376
July 2022 to June 2023	$	1,470

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Defined Benefit Pension Plan (Tables)

6 Months Ended

Jun. 30, 2018

Retirement Benefits [Abstract]

Components of Net Credits Related to the U.K. Pension Plan

For the three and six months ended June 30, 2018 and 2017, the components of the net pension credit for the U.K. Pension Plan recorded within Non-Operating Income in our Condensed Consolidated Income Statements were as follows (in thousands of dollars):

	Three Months Ended June 30,						Six Months Ended June 30,
	2018			2017			2018			2017
Interest cost	$	1,939		$	1,999		3,920			3,937
Expected return on plan assets	(2,839		)	(3,514		)	(5,741		)	(6,921		)
Prior service cost	—			15			—			30
Amortization of actuarial loss	122			280			247			553
Amortization of prior service cost	(26		)	(23		)	(52		)	(46		)
Net pension credit	$	(804	)	$	(1,243	)	$	(1,626	)	$	(2,447	)

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Debt (Tables)

6 Months Ended

Jun. 30, 2018

Debt Disclosure [Abstract]

Summary of Information Related to the Credit Agreement

The following tables summarize information related to our credit facilities as of and for the periods ended June 30, 2018, December 31, 2017, and June 30, 2017 (in thousands of dollars):

As of and for the periods ended	June 30, 2018		December 31, 2017		June 30, 2017
Maximum borrowing capacity (a)	$	1,100,000	$	1,100,000	$	1,335,000
Borrowing base	$	655,198	$	605,927	$	692,205
Borrowings outstanding (b)	$	63,000	$	196,500	$	531,500
Available borrowing capacity (c)	$	592,198	$	409,427	$	160,705
Average Borrowings Outstanding:
Three months ended June 30,	$	63,637	N/A		$	541,874
Six months ended June 30,	$	105,823	N/A		$	552,130
Year ended December 31,	N/A		$	479,367	N/A

(a) On October 2, 2017, we reduced the borrowing capacity of the previous SFS Credit Facility by $235 million. This reduction, which was entirely at our option and as part of our ongoing capital allocation analysis, was executed in order to reduce facility fees for unused borrowing capacity.

(b) The $63 million in borrowings outstanding under the New Credit Agreement as of June 30, 2018 were repaid in July 2018.

(c) The available borrowing capacity is calculated as the borrowing base less borrowings outstanding.

Schedule of Long-Term Debt

As of June 30, 2018, December 31, 2017, and June 30, 2017, Long-Term Debt consisted of the following (in thousands of dollars):

	June 30, 2018			December 31, 2017			June 30, 2017
York Property Mortgage, net of unamortized debt issuance costs of $4,039, $4,545, and $5,050	$	267,082		$	270,556		$	305,907
2022 Senior Notes, net of unamortized debt issuance costs of $0, $2,998, and $3,320	—			297,002			296,680
2025 Senior Notes, net of unamortized debt issuance costs of $5,248, $5,623, and $0	394,752			394,377			—
Less current portion:
York Property Mortgage, net of unamortized debt issuance costs of $1,010, $1,010, and $1,010	(13,423		)	(11,930		)	(38,825		)
2022 Senior Notes, net of unamortized debt issuance costs of $0, $2,998, and $0	—			(297,002		)	—
Total Long-Term Debt, net	$	648,411		$	653,003		$	563,762

Schedule of Aggregate Future Principal and Interest Payments

The aggregate future principal and interest payments due under the New Credit Agreement, the York Property Mortgage, and the 2025 Senior Notes during the five-year period after June 30, 2018 are as follows (in thousands of dollars):

Period	Amount
July 2018 to June 2019	$	109,344
July 2019 to June 2020	$	47,174
July 2020 to June 2021	$	46,774
July 2021 to June 2022	$	46,371
July 2022 to June 2023	$	230,678

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Derivative Financial Instruments (Tables)

6 Months Ended

Jun. 30, 2018

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Schedule of Fair Value Information Related to Derivative Financial Instruments

The following tables present fair value information related to the derivative financial instruments designated as hedging instruments as of June 30, 2018, December 31, 2017, and June 30, 2017 (in thousands of dollars):

	Assets			Liabilities
June 30, 2018	Balance Sheet Classification	Fair Value		Balance Sheet Classification		Fair Value
Cash Flow Hedges:
Interest rate swap	Other Current Assets	$	274	N/A		$	—
Interest rate collar	N/A	—		Other Current Liabilities		25
Interest rate collar	N/A	—		Other Long-Term Liabilities		207
Total cash flow hedges		274			—	232
Net Investment Hedges:
Foreign exchange contracts	Other Current Assets	4,444		N/A		—
Total		$	4,718			$	232

	Assets			Liabilities
December 31, 2017	Balance Sheet Classification	Fair Value		Balance Sheet Classification	Fair Value
Cash Flow Hedges:
Interest rate swap	Other Current Assets	$	339	N/A	$	—
Interest rate collar	N/A	—		Other Current Liabilities	666
Interest rate collar	N/A	—		Other Long-Term Liabilities	1,501
Total cash flow hedges		339			2,167
Net Investment Hedges:
Foreign exchange contracts	N/A	—		Other Current Liabilities	3,756
Total		$	339		$	5,923

	Assets			Liabilities
June 30, 2017	Balance Sheet Classification	Fair Value		Balance Sheet Classification	Fair Value
Cash Flow Hedges:
Interest rate swaps	Other Current Assets	$	308	N/A	$	—
Interest rate collar	N/A	—		Other Current Liabilities	1,550
Interest rate collar	N/A	—		Other Long-Term Liabilities	3,257
Total cash flow hedges		308			4,807
Net Investment Hedges:
Foreign exchange contracts	N/A	—		Other Current Liabilities	2,176
Total		$	308		$	6,983

Summary of the Effect of the Derivative Financial Instruments

The following tables summarize the effect of the derivative financial instruments designated as hedging instruments on our Condensed Consolidated Income Statements and Consolidated Condensed Statements of Comprehensive Income for the three and six months ended June 30, 2018 and 2017 (in thousands of dollars):

	Gain (Loss) Recognized in Other Comprehensive Income - Effective Portion					Classification of Gain (Loss) Reclassified from Accumulated Other Comprehensive Loss into Net Income	Amount Reclassified from Accumulated Other Comprehensive Loss into Net Income - Effective Portion						Amount Reclassified from Accumulated Other Comprehensive Loss into Net Income - Ineffective Portion
Three Months Ended June 30,	2018		2017				2018			2017			2018		2017
Cash Flow Hedges:
Interest rate swaps	$	15	$	(7	)	Interest Expense	$	(93	)	$	(50	)	$	—	$	—
Interest rate collar	207		(527		)	Interest Expense	7			—			—		—
Interest rate collar	—		—			Non-operating income	—			—			—		622
Total cash flow hedges	222		(534		)		(86		)	(50		)	—		622
Net Investment Hedges:
Foreign exchange contracts	3,350		(1,454		)	N/A	—			—			—		—
Total	$	3,572	$	(1,988	)		$	(86	)	$	(50	)	$	—	$	622

	Gain (Loss) Recognized in Other Comprehensive Income - Effective Portion					Classification of Gain (Loss) Reclassified from Accumulated Other Comprehensive Loss into Net Income	Amount Reclassified from Accumulated Other Comprehensive Loss into Net Income - Effective Portion					Amount Reclassified from Accumulated Other Comprehensive Loss into Net Income - Ineffective Portion
Six Months Ended June 30,	2018		2017				2018			2017		2018		2017
Cash Flow Hedges:
Interest rate swaps	$	95	$	134		Interest Expense	$	(145	)	$	35	$	—	$	—
Interest rate collar	1,187		85			Interest Expense	169			—		—		—
Interest rate collar	—		—			Non-operating income	—			—		—		622
Total cash flow hedges	1,282		219				24			35		—		622
Net Investment Hedges:
Foreign exchange contracts	1,740		(2,078		)	N/A	—			—		—		—
Total	$	3,022	$	(1,859	)		$	24		$	35	$	—	$	622

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Supplemental Condensed Consolidated Balance Sheet Information (Tables)

6 Months Ended

Jun. 30, 2018

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Schedule of Prepaid Expenses and Other Current Assets

As of June 30, 2018, December 31, 2017, and June 30, 2017, Prepaid Expenses and Other Current Assets consisted of the following (in thousands of dollars):

	June 30, 2018		December 31, 2017		June 30, 2017
Prepaid expenses	$	25,586	$	25,418	$	27,293
Derivative financial instruments (see Note 9)	274		339		308
Insurance recoveries	2,335		—		—
Other	15,067		6,253		17,854
Total Prepaid Expenses and Other Current Assets	$	43,262	$	32,010	$	45,455

Schedule of Other Long-Term Assets

As of June 30, 2018, December 31, 2017, and June 30, 2017, Other Long-Term Assets consisted of the following (in thousands of dollars):

	June 30, 2018		December 31, 2017		June 30, 2017
Defined benefit pension plan asset	$	107,647	$	108,826	$	86,317
Equity method investments (a)	46,789		46,905		47,299
Trust assets related to deferred compensation liability	30,017		26,240		25,128
Restricted cash (see Note 12)	17,442		17,916		17,332
Insurance recoveries	12,782		12,242		14,527
Other	15,136		15,479		2,392
Total Other Long-Term Assets	$	229,813	$	227,608	$	192,995

(a) Includes our equity method investments in RM Sotheby's and AMA, as well as a partnership that was formed in the second quarter of 2017 through which artworks are being purchased and sold.

Schedule of Other Long-Term Liabilities

As of June 30, 2018, December 31, 2017, and June 30, 2017, Other Long-Term Liabilities consisted of the following (in thousands of dollars):

	June 30, 2018		December 31, 2017		June 30, 2017
Deferred compensation liability	$	29,605	$	25,614	$	24,477
Acquisition earn-out consideration	8,750		17,500		17,500
Interest rate collar liability (see Note 9)	207		1,501		3,257
Other	7,609		6,809		6,623
Total Other Long-Term Liabilities	$	46,171	$	51,424	$	51,857

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Supplemental Condensed Consolidated Cash Flow Information (Tables)

6 Months Ended

Jun. 30, 2018

Supplemental Cash Flow Information [Abstract]

Schedule of Restricted Cash Classified Within Current Assets

As of June 30, 2018, December 31, 2017, and June 30, 2017, cash, cash equivalents, and restricted cash consisted of the following (in thousands of dollars):

	June 30, 2018		December 31, 2017		June 30, 2017
Cash and cash equivalents	$	432,357	$	544,432	$	516,402
Restricted cash, recorded within current assets:
Consignor funds held in legally segregated accounts	23,528		46,029		33,164
Funds deposited with the trustee for the redemption of the 2022 Senior Notes (see Note 8)	—		312,250		—
Cash Management Account related to the York Property Mortgage (see Note 8)	5,264		3,107		7,434
Other	187		192		660
Restricted cash, recorded within current assets	28,979		361,578		41,258
Restricted cash, recorded within other long-term assets (a)	17,442		17,916		17,332
Total restricted cash	46,421		379,494		58,590
Cash, cash equivalents, and restricted cash	$	478,778	$	923,926	$	574,992

(a) Restricted cash reflected within Other Long-Term Assets principally relates to $15.3 million of funds held in escrow pending the final settlement of a sale.

Supplemental Condensed Consolidated Cash Flow Information

For the six months ended June 30, 2018 and 2017, changes in other operating assets and liabilities as reported in the Condensed Consolidated Statements of Cash Flows included the following (in thousands of dollars):

	Six Months Ended June 30,
	2018			2017
(Increase) decrease in:
Prepaid expenses and other current assets	$	(8,233	)	$	2,342
Other long-term assets	(3,611		)	(1,306		)
Income tax receivables and deferred income tax assets	(9,782		)	(20,896		)
(Decrease) increase in:
Accounts payable and accrued liabilities and other liabilities	(23,870		)	(20,575		)
Accrued income taxes and deferred income tax liabilities	4,126			(2,872		)
Total changes in other operating assets and liabilities	$	(41,370	)	$	(43,307	)

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Shareholders' Equity and Dividends (Tables)

6 Months Ended

Jun. 30, 2018

Equity [Abstract]

Schedule of Information Regarding Common Stock Repurchase Program

The following table provides information regarding our common stock repurchase program for the six months ended June 30, 2018 and 2017 (in thousands, except for per share data):

	Six Months Ended
	June 30, 2018		June 30, 2017
Shares repurchased	1,193		740
Aggregate purchase price	$	62,497	$	33,940
Average price per share	$	52.40	$	45.86

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Accumulated Other Comprehensive Loss (Tables)

6 Months Ended

Jun. 30, 2018

Equity [Abstract]

Summary of Changes in Accumulated Other Comprehensive Loss

The following is a summary of the changes in Accumulated Other Comprehensive Loss and the details regarding any reclassification adjustments made for the three and six months ended June 30, 2018 and 2017 (in thousands of dollars):

	Three Months Ended June 30,						Six Months Ended June 30,
	2018			2017			2018			2017
Currency Translation Adjustments
Balance at beginning of period	$	(67,280	)	$	(86,853	)	$	(74,505	)	$	(89,478	)
Other comprehensive (loss) income before reclassifications, net of tax of $0, $835, $400, and $1,421	(14,238		)	6,526			(7,013		)	9,151
Other comprehensive (loss) income	(14,238		)	6,526			(7,013		)	9,151
Balance at end of period	(81,518		)	(80,327		)	(81,518		)	(80,327		)
Cash Flow Hedges
Balance at beginning of period	141			(2,826		)	(1,029		)	(3,664		)
Other comprehensive income (loss) before reclassifications, net of tax of $73, ($331), $423, and $135	222			(534		)	1,282			219
Reclassifications from accumulated other comprehensive loss, net of tax of ($28), $354, $8, and $407	(86		)	572			24			657
Other comprehensive income	136			38			1,306			876
Balance at end of period	277			(2,788		)	277			(2,788		)
Net Investment Hedges
Balance at beginning of period	11,949			15,994			13,559			16,618
Other comprehensive income (loss) before reclassifications, net of tax of $1,094, ($885), $569, and ($1,270)	3,350			(1,454		)	1,740			(2,078		)
Other comprehensive income (loss)	3,350			(1,454		)	1,740			(2,078		)
Balance at end of period	15,299			14,540			15,299			14,540
Defined Benefit Pension Plan
Balance at beginning of period	(434		)	(13,855		)	(491		)	(13,834		)
Currency translation adjustments	32			(571		)	7			(800		)
Other comprehensive income (loss) before reclassifications	32			(571		)	7			(800		)
Prior service cost amortization, net of tax of ($4), ($3), ($8), and ($7)	(21		)	(20		)	(43		)	(39		)
Actuarial loss amortization, net of tax of $19, $45, $40, and $91	102			235			206			462
Reclassifications from accumulated other comprehensive loss, net of tax	81			215			163			423
Other comprehensive income (loss)	113			(356		)	170			(377		)
Balance at end of period	(321		)	(14,211		)	(321		)	(14,211		)
Total other comprehensive (loss) income attributable to Sotheby's	(10,639		)	4,754			(3,797		)	7,572
Accumulated other comprehensive loss as of June 30	$	(66,263	)	$	(82,786	)	$	(66,263	)	$	(82,786	)

Summary of Reclassification Adjustments

	Three Months Ended June 30,						Six Months Ended June 30,
	2018			2017			2018			2017
Cash Flow Hedges
Settlements	$	(114	)	$	926		$	32		$	1,064
Tax effect	28			(354		)	(8		)	(407		)
Reclassification adjustments, net of tax	(86		)	572			24			657
Defined Benefit Pension Plan
Prior service cost amortization	(26		)	(23		)	(52		)	(46		)
Actuarial loss amortization	122			280			247			553
Pre-tax total	96			257			195			507
Tax effect	(15		)	(42		)	(32		)	(84		)
Reclassification adjustments, net of tax	81			215			163			423
Total reclassification adjustments, net of tax	$	(5	)	$	787		$	187		$	1,080

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Share-Based Payments (Tables)

6 Months Ended

Jun. 30, 2018

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Schedule of Compensation Expense for Share-Based Payments

For the three and six months ended June 30, 2018 and 2017, compensation expense related to share-based payments was as follows (in thousands of dollars):

	Three Months Ended June 30,				Six Months Ended June 30,
	2018		2017		2018		2017
Pre-tax	$	6,312	$	5,946	$	14,689	$	12,015
After-tax	$	5,087	$	3,940	$	11,726	$	7,997

Schedule of Changes to the Number of Outstanding RSU's, PSU's, and Restricted Shares

For the six months ended June 30, 2018, changes to the number of outstanding RSU’s, PSU’s, and restricted shares were as follows (shares in thousands):

	Restricted Shares, RSU's and PSU's		Weighted Average Grant Date Fair Value
Outstanding at January 1, 2018	1,922		$	36.59
Granted	686		$	47.06
Vested	(526	)	$	38.95
Canceled	(157	)	$	39.83
Outstanding at June 30, 2018	1,925		$	39.41

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Earnings Per Share (Tables)

6 Months Ended

Jun. 30, 2018

Earnings Per Share [Abstract]

Computation Of Basic And Diluted (Loss) Earnings Per Share

The table below summarizes the computation of basic and diluted earnings per share for the three and six months ended June 30, 2018 and 2017 (in thousands, except per share amounts):

	Three Months Ended June 30,				Six Months Ended June 30,
	2018		2017		2018		2017
Basic:
Numerator:
Net income attributable to Sotheby’s	$	57,282	$	76,891	$	50,760	$	65,566
Less: Net income attributable to participating securities	844		1,176		763		1,019
Net income attributable to Sotheby’s common shareholders	$	56,438	$	75,715	$	49,997	$	64,547
Denominator:
Weighted average common shares outstanding	51,780		52,716		52,122		52,866
Basic earnings per share - Sotheby’s common shareholders	$	1.09	$	1.44	$	0.96	$	1.22
Diluted:
Numerator:
Net income attributable to Sotheby’s	$	57,282	$	76,891	$	50,760	$	65,566
Less: Net income attributable to participating securities	844		1,176		763		1,019
Net income attributable to Sotheby’s common shareholders	$	56,438	$	75,715	$	49,997	$	64,547
Denominator:
Weighted average common shares outstanding	51,780		52,716		52,122		52,866
Weighted average effect of dilutive potential common shares:
Performance share units	259		151		197		293
Deferred stock units	171		159		172		157
Stock options	—		28		—		26
Weighted average dilutive potential common shares outstanding	430		338		369		476
Weighted average diluted shares outstanding	52,210		53,054		52,491		53,342
Diluted earnings per share - Sotheby’s common shareholders	$	1.08	$	1.43	$	0.95	$	1.21

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Basis of Presentation (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018 USD ($)	Jun. 30, 2017 USD ($)	Jun. 30, 2018 USD ($) salesroom	Jun. 30, 2017 USD ($)
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Number of salesrooms | salesroom			10
Ownership interest in joint venture (as a percent)	80.00%		80.00%
Ownership interest reported as Noncontrolling Interest (as a percent)	20.00%		20.00%
Revenues:
Agency commissions and fees	$ 290,879	$ 301,768	$ 456,405	$ 413,033
Total revenues	345,636	339,859	541,432	539,168
Expenses:
Agency direct costs	59,449	54,842	94,722	76,131
Salaries and related	96,718	88,540	175,437	154,090
Total expenses	261,810	225,704	450,695	439,071
Operating loss	83,826	114,155	90,737	100,097
Non-operating income	2,449	944	3,873	2,988
Net income attributable to Sotheby’s	57,282	76,891	50,760	65,566
Operating Activities:
Changes in other operating assets and liabilities			(41,370)	(43,307)
Net cash provided by operating activities			16,795	54,257
Investing Activities:
Proceeds from company-owned life insurance			0	2,100
Decrease in restricted cash				0
Net cash provided by investing activities			66,001	44,896
Financing Activities:
Increase in restricted cash related to York Property Mortgage				0
Net cash used by financing activities			(521,210)	(88,221)
Effect of exchange rate changes on cash, cash equivalents, and restricted cash			(6,734)	7,859
Increase (decrease) in cash, cash equivalents, and restricted cash (a)			(445,148)	18,791
Cash, cash equivalents, and restricted cash at beginning of period			923,926	556,201
Cash, cash equivalents, and restricted cash at end of period	$ 478,778	574,992	$ 478,778	574,992
As Previously Reported
Revenues:
Agency commissions and fees		276,807		376,300
Total revenues		314,898		502,435
Expenses:
Agency direct costs		29,881		39,398
Salaries and related		87,297		151,643
Total expenses		199,500		399,891
Operating loss		115,398		102,544
Non-operating income		(299)		541
Net income attributable to Sotheby’s		76,891		65,566
Operating Activities:
Changes in other operating assets and liabilities				(41,207)
Net cash provided by operating activities				56,357
Investing Activities:
Proceeds from company-owned life insurance				0
Decrease in restricted cash				7,749
Net cash provided by investing activities				50,545
Financing Activities:
Increase in restricted cash related to York Property Mortgage				(2,799)
Net cash used by financing activities				(91,020)
Effect of exchange rate changes on cash, cash equivalents, and restricted cash				4,489
Increase (decrease) in cash, cash equivalents, and restricted cash (a)				20,371
Cash, cash equivalents, and restricted cash at beginning of period				496,031
Cash, cash equivalents, and restricted cash at end of period		516,402		516,402
ASC 606 | Adjustment
Revenues:
Agency commissions and fees		24,961		36,733
Total revenues		24,961		36,733
Expenses:
Agency direct costs		24,961		36,733
Salaries and related		0		0
Total expenses		24,961		36,733
Operating loss		0		0
Non-operating income		0		0
Net income attributable to Sotheby’s		0		0
ASU 2017-07 | Adjustment
Revenues:
Agency commissions and fees		0		0
Total revenues		0		0
Expenses:
Agency direct costs		0		0
Salaries and related		1,243		2,447
Total expenses		1,243		2,447
Operating loss		(1,243)		(2,447)
Non-operating income		1,243		2,447
Net income attributable to Sotheby’s		0		0
ASU 2016-15 | Adjustment
Operating Activities:
Changes in other operating assets and liabilities				(2,100)
Net cash provided by operating activities				(2,100)
Investing Activities:
Proceeds from company-owned life insurance				2,100
Decrease in restricted cash				0
Net cash provided by investing activities				2,100
Financing Activities:
Increase in restricted cash related to York Property Mortgage				0
Net cash used by financing activities				0
Effect of exchange rate changes on cash, cash equivalents, and restricted cash				0
Increase (decrease) in cash, cash equivalents, and restricted cash (a)				0
Cash, cash equivalents, and restricted cash at beginning of period				0
Cash, cash equivalents, and restricted cash at end of period		0		0
ASU 2016-18 | Adjustment
Operating Activities:
Changes in other operating assets and liabilities				0
Net cash provided by operating activities				0
Investing Activities:
Proceeds from company-owned life insurance				0
Decrease in restricted cash				(7,749)
Net cash provided by investing activities				(7,749)
Financing Activities:
Increase in restricted cash related to York Property Mortgage				2,799
Net cash used by financing activities				2,799
Effect of exchange rate changes on cash, cash equivalents, and restricted cash				3,370
Increase (decrease) in cash, cash equivalents, and restricted cash (a)				(1,580)
Cash, cash equivalents, and restricted cash at beginning of period				60,170
Cash, cash equivalents, and restricted cash at end of period		$ 58,590		$ 58,590

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Seasonality of Business (Details) - principal_selling_season	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Jun. 30, 2018
Seasonality Of Business [Abstract]
Number of principal selling seasons			2
Second and fourth quarter Net Auction Sales (as a percent)	80.00%	82.00%
Auction commission revenues (as a percent)	66.00%	75.00%

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Segment Reporting - Narrative (Details)	6 Months Ended
	Jun. 30, 2018 segment
Segment Reporting [Abstract]
Number of operating segments	2

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Segment Reporting - Schedule of Segment Information (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Segment Reporting [Line Items]
Revenues	$ 345,636	$ 339,859	$ 541,432	$ 539,168
Segment income before taxes	73,881	107,894	62,413	88,604
Operating Segments
Segment Reporting [Line Items]
Segment income before taxes	75,115	108,360	75,308	89,737
Operating Segments | Agency
Segment Reporting [Line Items]
Revenues	327,445	319,474	507,178	499,665
Segment income before taxes	67,173	97,226	57,467	68,804
Operating Segments | SFS
Segment Reporting [Line Items]
Revenues	11,823	16,362	24,239	30,733
Segment income before taxes	6,891	8,879	15,402	16,212
Operating Segments | All Other
Segment Reporting [Line Items]
Revenues	8,550	7,026	14,732	13,377
Segment income before taxes	1,051	2,255	2,439	4,721
Reconciling items
Segment Reporting [Line Items]
Revenues	(2,182)	(3,003)	(4,717)	(4,607)
Segment income before taxes	$ (1,234)	$ (466)	$ (12,895)	$ (1,133)

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Segment Reporting - Reconciliation of Segment (Loss) Income Before Taxes (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Segment income before taxes	$ 73,881	$ 107,894	$ 62,413	$ 88,604
Extinguishment of debt	0	0	10,855	0
Equity in earnings of investees	1,234	466	2,040	1,133
Operating Segments
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Segment income before taxes	75,115	108,360	75,308	89,737
Operating Segments | Agency
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Segment income before taxes	67,173	97,226	57,467	68,804
Operating Segments | SFS
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Segment income before taxes	6,891	8,879	15,402	16,212
Operating Segments | All Other
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Segment income before taxes	1,051	2,255	2,439	4,721
Reconciling items
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Segment income before taxes	(1,234)	(466)	(12,895)	(1,133)
Extinguishment of debt	0	0	(10,855)	0
Equity in earnings of investees	$ (1,234)	$ (466)	$ (2,040)	$ (1,133)

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Segment Reporting - Reconciliation of Segment Assets to Consolidated Assets (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017	Jun. 30, 2017
Segment Reporting [Line Items]
Consolidated assets	$ 2,811,667	$ 3,087,307	$ 2,840,378
Operating Segments
Segment Reporting [Line Items]
Consolidated assets	2,765,341	3,044,708	2,842,282
Operating Segments | Agency
Segment Reporting [Line Items]
Consolidated assets	2,227,296	2,395,429	2,130,731
Operating Segments | SFS
Segment Reporting [Line Items]
Consolidated assets	494,420	608,713	663,500
Operating Segments | All Other
Segment Reporting [Line Items]
Consolidated assets	43,625	40,566	48,051
Unallocated amounts and reconciling items
Segment Reporting [Line Items]
Consolidated assets	46,326	42,599	23,096
Unallocated amounts and reconciling items | SFS
Segment Reporting [Line Items]
Consolidated assets	$ 0	$ 0	$ 25,000

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Revenues (Revenues by Segment) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2004	Jan. 01, 2018	Dec. 31, 2017	Jan. 01, 2017
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	$ 345,636	$ 339,859	$ 541,432	$ 539,168
Period after sale when purchase price is due			30 days
Period from sale date when net proceeds are due			35 days
Accounts Receivable (net)	1,088,569	847,332	$ 1,088,569	847,332			$ 795,239
Contract costs	1,076,152	837,200	1,076,152	837,200		$ 783,706		$ 424,418
Prepaid Expenses and Other Current Assets
Disaggregation of Revenue [Line Items]
Contract costs	6,800	7,500	6,800	7,500			9,600
Consignor paid before payment was collected from the buyer
Disaggregation of Revenue [Line Items]
Accounts Receivable (net)	75,300	85,300	75,300	85,300			92,100
Buyer allowed to take possession before making payment
Disaggregation of Revenue [Line Items]
Accounts Receivable (net)	26,900	33,400	26,900	33,400			$ 53,800
Trademarks
Disaggregation of Revenue [Line Items]
Initial term					50 years
Renewal term					50 years
Auction commissions
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	257,799	266,949	389,929	357,565
Auction related fees, net
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	6,081	16,045	17,824	21,498
Private sale commissions
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	24,516	14,827	44,001	28,047
Other Agency commissions and fees
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	2,483	3,947	4,651	5,923
Total Agency commissions and fees
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	290,879	301,768	456,405	413,033
Inventory sales
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	40,106	19,937	56,342	91,314
Advisory revenues
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	1,156	1,431	2,406	2,829
License fee and other revenues
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	3,854	3,364	6,757	5,866
Total revenue from contracts with customers
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	335,995	326,500	521,910	513,042
Interest and related fees
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	9,641	13,359	19,522	26,126
Agency
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	327,445	319,474	507,178	499,665
Agency | Auction commissions
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	257,799	266,949	389,929	357,565
Agency | Auction related fees, net
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	6,081	16,045	17,824	21,498
Agency | Private sale commissions
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	24,016	14,827	43,501	28,047
Agency | Other Agency commissions and fees
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	2,359	3,947	4,351	5,923
Agency | Total Agency commissions and fees
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	290,255	301,768	455,605	413,033
Agency | Inventory sales
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	37,190	17,706	51,573	86,632
Agency | Advisory revenues
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	0	0	0	0
Agency | License fee and other revenues
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	0	0	0	0
Agency | Total revenue from contracts with customers
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	327,445	319,474	507,178	499,665
Agency | Interest and related fees
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	0	0	0	0
SFS
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	9,641	13,359	19,522	26,126
SFS | Auction commissions
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	0	0	0	0
SFS | Auction related fees, net
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	0	0	0	0
SFS | Private sale commissions
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	0	0	0	0
SFS | Other Agency commissions and fees
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	0	0	0	0
SFS | Total Agency commissions and fees
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	0	0	0	0
SFS | Inventory sales
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	0	0	0	0
SFS | Advisory revenues
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	0	0	0	0
SFS | License fee and other revenues
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	0	0	0	0
SFS | Total revenue from contracts with customers
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	0	0	0	0
SFS | Interest and related fees
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	9,641	13,359	19,522	26,126
All Other
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	8,550	7,026	14,732	13,377
All Other | Auction commissions
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	0	0	0	0
All Other | Auction related fees, net
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	0	0	0	0
All Other | Private sale commissions
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	500	0	500	0
All Other | Other Agency commissions and fees
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	124	0	300	0
All Other | Total Agency commissions and fees
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	624	0	800	0
All Other | Inventory sales
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	2,916	2,231	4,769	4,682
All Other | Advisory revenues
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	1,156	1,431	2,406	2,829
All Other | License fee and other revenues
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	3,854	3,364	6,757	5,866
All Other | Total revenue from contracts with customers
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	8,550	7,026	14,732	13,377
All Other | Interest and related fees
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	$ 0	$ 0	$ 0	$ 0

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Revenues (Contracts with Customers) (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jan. 01, 2018	Jan. 01, 2017
Revenue from Contract with Customer [Abstract]
Accounts Receivable	$ 1,076,152	$ 837,200	$ 783,706	$ 424,418
Increase/(decrease)	292,446	412,782
Client Payables	1,191,581	867,856	$ 996,197	$ 511,876
Increase/(decrease)	$ 195,384	$ 355,980

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Notes Receivable - Sotheby's Financial Services Narrative (Details) - USD ($)		6 Months Ended
	Aug. 03, 2018	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]
Period in advance during which sellers may receive funds upon consignment (up to)		1 year
Repayments collected		$ 41,100,000	$ 6,900,000
Target LTV ratio		50.00%	50.00%	50.00%
Past due period		90 days
Unfunded commitments to extend additional credit through SFS		$ 50,200,000
Subsequent Event
Accounts, Notes, Loans and Financing Receivable [Line Items]
Additional proceeds	$ 14,100,000
Recorded investment	$ 3,100,000
Minimum
Accounts, Notes, Loans and Financing Receivable [Line Items]
LTV ratio		51.00%
Maximum
Accounts, Notes, Loans and Financing Receivable [Line Items]
LTV ratio		60.00%
Term loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Initial maturities of term loans (up to) (term)		2 years
Past due loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Target LTV ratio		25.00%
Accrual of interest		$ 46,900,000
Collateral held against amounts reclassified from Accounts Receivable (net)		190,800,000
SFS
Accounts, Notes, Loans and Financing Receivable [Line Items]
Net Notes Receivable balance of SFS		479,972,000	$ 651,361,000	$ 590,609,000
Term loans issued by SFS		28,400,000	85,600,000	$ 54,400,000
Loans issued to refinance client auction and private sale purchases		$ 15,100,000	$ 3,800,000
Target LTV ratio		41.00%	45.00%	43.00%
Net Notes Receivable balance past due		$ 62,310,000	$ 108,560,000	$ 62,570,000
Net Notes Receivable balance 90 days past due		41,819,000	41,448,000	56,087,000
Collateral held against amounts reclassified from Accounts Receivable (net)		1,159,693,000	1,445,847,000	1,369,235,000
Additional proceeds		(32,000,000)
Recorded investment		17,200,000
Non-accrual loan outstanding		15,402,000	0	0
Accrued interest		1,800,000
Impaired loans outstanding		$ 0	$ 0	$ 0

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Notes Receivable - Schedule of Aggregate LTV Ratio (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017	Jun. 30, 2017
Segment Reporting [Line Items]
Aggregate LTV ratio	50.00%	50.00%	50.00%
SFS
Segment Reporting [Line Items]
Secured loans	$ 479,972	$ 590,609	$ 651,361
Low auction estimate of collateral	$ 1,159,693	$ 1,369,235	$ 1,445,847
Aggregate LTV ratio	41.00%	43.00%	45.00%
SFS | Loan to Value Ratio Above 50%
Segment Reporting [Line Items]
Secured loans	$ 105,744	$ 168,116	$ 209,483
Low auction estimate of collateral	$ 182,398	$ 269,063	$ 375,933
Aggregate LTV ratio	58.00%	62.00%	56.00%

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Notes Receivable - Schedule of Other Credit Quality Information (Details) - USD ($)	Jun. 30, 2018	Dec. 31, 2017	Jun. 30, 2017
Allowance for credit losses:
Total allowance for credit losses - secured loans	$ 2,657,000	$ 2,778,000
SFS
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total secured loans	479,972,000	590,609,000	$ 651,361,000
Loans past due	62,310,000	62,570,000	108,560,000
Loans more than 90 days past due	41,819,000	56,087,000	41,448,000
Non-accrual loans	15,402,000	0	0
Impaired loans	0	0	0
Allowance for credit losses:
Allowance for credit losses for impaired loans	0	0	0
Allowance for credit losses based on historical data	1,132,000	1,253,000	1,290,000
Total allowance for credit losses - secured loans	$ 1,132,000	$ 1,253,000	$ 1,290,000

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Notes Receivable - Schedule of Activity Related to Allowance for Credit Losses (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2018 USD ($)
Allowance for Loan and Lease Losses
Allowance for credit losses, beginning balance	$ 2,778
Change in loan loss provision	(121)
Allowance for credit losses, ending balance	2,657
SFS
Allowance for Loan and Lease Losses
Allowance for credit losses, beginning balance	1,253
Change in loan loss provision	(121)
Allowance for credit losses, ending balance	1,132
Agency
Allowance for Loan and Lease Losses
Allowance for credit losses, beginning balance	1,525
Change in loan loss provision	0
Allowance for credit losses, ending balance	$ 1,525

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Notes Receivable - Agency Segment Narrative (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]
Repayments collected	$ 41,100	$ 6,900
Credit loss	2,657		$ 2,778
Agency
Accounts, Notes, Loans and Financing Receivable [Line Items]
Notes Receivable within the Agency segment	1,200	2,600	2,700
Repayments collected	1,000	5,000
Total secured loans	2,100	$ 3,800	2,100
Credit loss	$ 1,525		$ 1,525

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Goodwill and Intangible Assets - Schedule of Goodwill (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Goodwill
Beginning balance	$ 50,547	$ 50,029
Goodwill acquired	5,259	0
Foreign currency exchange rate changes	(136)	322
Ending balance	55,670	50,351
Agency
Goodwill
Beginning balance	44,396	43,878
Goodwill acquired	5,259	0
Foreign currency exchange rate changes	(136)	322
Ending balance	49,519	44,200
All Other
Goodwill
Beginning balance	6,151	6,151
Goodwill acquired	0	0
Foreign currency exchange rate changes	0	0
Ending balance	$ 6,151	$ 6,151

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Goodwill and Intangible Assets - Schedule of Indefinite and Finite-Lived Intangible Assets (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2018	Dec. 31, 2017	Jun. 30, 2017
Finite-Lived Intangible Assets [Line Items]
Intangible assets subject to amortization	$ 19,521	$ 15,060	$ 14,985
Accumulated amortization	(5,232)	(3,892)	(2,902)
Total amortizable intangible assets (net)	14,289	11,168	12,083
Total intangible assets (net)	14,613	11,492	12,407
License
Indefinite-lived Intangible Assets [Line Items]
Indefinite-lived intangible assets	$ 324	324	324
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Amortization Period	8 years
Intangible assets subject to amortization	$ 10,800	10,800	10,800
Non-compete agreements
Finite-Lived Intangible Assets [Line Items]
Amortization Period	6 years
Intangible assets subject to amortization	$ 3,060	3,060	3,060
Artworks database
Finite-Lived Intangible Assets [Line Items]
Amortization Period	10 years
Intangible assets subject to amortization	$ 1,200	1,200	1,125
Technology
Finite-Lived Intangible Assets [Line Items]
Amortization Period	4 years
Intangible assets subject to amortization	$ 4,461	$ 0	$ 0

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Goodwill and Intangible Assets - Narrative (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Goodwill and Intangible Assets Disclosure [Abstract]
Amortization expense related to intangible assets	$ 0.7	$ 0.5	$ 1.3	$ 1.0

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Goodwill and Intangible Assets - Schedule of Estimated Aggregate Amortization Expense (Details) $ in Thousands	Jun. 30, 2018 USD ($)
Finite-Lived Intangible Assets, Net, Amortization Expense, Rolling Maturity [Abstract]
July 2018 to June 2019	$ 3,095
July 2019 to June 2020	3,095
July 2020 to June 2021	3,095
July 2021 to June 2022	2,376
July 2022 to June 2023	$ 1,470

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Defined Benefit Pension Plan (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Retirement Benefits [Abstract]
Interest cost	$ 1,939	$ 1,999	$ 3,920	$ 3,937
Expected return on plan assets	(2,839)	(3,514)	(5,741)	(6,921)
Prior service cost	0	15	0	30
Amortization of actuarial loss	122	280	247	553
Amortization of prior service cost	(26)	(23)	(52)	(46)
Net pension credit	$ (804)	$ (1,243)	$ (1,626)	$ (2,447)

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Debt - Revolving Credit Facility Narrative (Details) - Credit Agreement - USD ($)	Jun. 26, 2018	Jun. 30, 2018	Dec. 31, 2017	Jun. 30, 2017
Debt [Line Items]
Maximum borrowing capacity		$ 1,100,000,000.0	$ 1,100,000,000	$ 1,335,000,000
Line of credit, sub limit		350,000,000
Maximum increase in borrowing capacity		300,000,000
Aggregate fees paid		4,000,000
Unamortized fees included within Other Long-Term Assets		$ 4,000,000
LIBOR
Debt [Line Items]
Decrease in basis points	0.25%

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Debt - Summary of Information Related to the Credit Agreement (Details) - USD ($)	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017	Oct. 02, 2017
Line of Credit Facility [Line Items]
Borrowings outstanding	$ 63,000,000	$ 531,500,000	$ 63,000,000	$ 531,500,000	$ 196,500,000
Credit Agreement
Line of Credit Facility [Line Items]
Maximum borrowing capacity	1,100,000,000.0	1,335,000,000	1,100,000,000.0	1,335,000,000	1,100,000,000
Borrowing base	655,198,000	692,205,000	655,198,000	692,205,000	605,927,000
Borrowings outstanding	63,000,000	531,500,000	63,000,000	531,500,000	196,500,000
Available borrowing capacity	592,198,000	160,705,000	592,198,000	160,705,000	409,427,000
Average borrowings outstanding	$ 63,637,000	$ 541,874,000	$ 105,823,000	$ 552,130,000	$ 479,367,000
SFS Credit Facility
Line of Credit Facility [Line Items]
Decrease to borrowing capacity						$ 235,000,000

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Debt - Schedule of Long-Term Debt (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017	Jun. 30, 2017
Debt [Line Items]
Total Long-Term Debt, net	$ 648,411	$ 653,003	$ 563,762
York Property Mortgage
Debt [Line Items]
Long-term debt	267,082	270,556	305,907
Less current portion	(13,423)	(11,930)	(38,825)
Unamortized debt issuance costs, noncurrent	4,039	4,545	5,050
Unamortized debt issuance costs, current	1,010	1,010	1,010
2022 Senior Notes
Debt [Line Items]
Long-term debt	0	297,002	296,680
Less current portion	0	(297,002)	0
Unamortized debt issuance costs, noncurrent	0	2,998	3,320
2025 Senior Notes
Debt [Line Items]
Long-term debt	394,752	394,377	0
Unamortized debt issuance costs, noncurrent	5,248	5,623	0
Unamortized debt issuance costs, current	$ 0	$ 2,998	$ 0

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Debt - York Property Mortgage Narrative (Details) - USD ($)					6 Months Ended		37 Months Ended
	Jul. 02, 2018	Jul. 03, 2017	Jul. 01, 2017	Jul. 01, 2015	Jun. 30, 2018	Jun. 30, 2017	Jul. 31, 2021	Dec. 31, 2017	Jun. 20, 2017
Debt [Line Items]
Equity					$ 606,744,000	$ 543,143,000		$ 616,940,000
Annual prepayments					3,978,000	3,810,000
Parent Company
Debt [Line Items]
Equity					606,700,000
Mortgages
Debt [Line Items]
Annual prepayments		$ 32,000,000
Mortgages | Scenario, Forecast
Debt [Line Items]
Annual prepayments							$ 6,250,000
Mortgages | Maximum
Debt [Line Items]
Annual prepayments		25,000,000
Mortgages | Cash
Debt [Line Items]
Annual prepayments		25,000,000
Mortgages | Restricted Cash
Debt [Line Items]
Annual prepayments		$ 7,000,000
Mortgages | Restricted Cash | Subsequent Event
Debt [Line Items]
Annual prepayments	$ 6,250,000
Mortgages | York Property Mortgage
Debt [Line Items]
Debt term			7 years	7 years
Principal amount				$ 325,000,000
Unsecured debt retired					$ 271,100,000
Amortization period				25 years
Maximum Loan-To-Value ratio under agreement (as a percent)					65.00%
Minimum debt yield under agreement (as a percent)					8.50%
Restricted cash and cash equivalents					$ 5,300,000	$ 7,400,000		$ 3,100,000
Minimum net worth required for compliance					$ 325,000,000				$ 425,000,000
Mortgages | York Property Mortgage | Standard & Poor's, B Rating
Debt [Line Items]
Required debt service					12 months
Mortgages | York Property Mortgage | Standard & Poor's, B Plus Rating
Debt [Line Items]
Required debt service					6 months
Mortgages | York Property Mortgage | LIBOR
Debt [Line Items]
Basis spread on variable rate (as a percent)				2.25%

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Debt - Senior Unsecured Debt Narrative (Details) - USD ($)			3 Months Ended		6 Months Ended
	Jan. 11, 2018	Dec. 12, 2017	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Sep. 27, 2012
Debt [Line Items]
Extinguishment of debt			$ 0	$ 0	$ 10,855,000	$ 0
2022 Senior Notes | Senior Notes
Debt [Line Items]
Principal amount	$ 300,000,000						$ 300,000,000
Debt instrument stated interest percentage							5.25%
Amount redeemed	312,300,000
Accrued interest	4,400,000
Payment for debt extinguishment	7,900,000
Write off of debt issuance cost	3,000,000
Extinguishment of debt	$ 10,900,000
2025 Senior Notes | Senior Notes
Debt [Line Items]
Principal amount		$ 400,000,000	400,000,000		400,000,000
Debt instrument stated interest percentage		4.875%
Net proceeds from issuance of long term debt		$ 395,500,000
Amount deposited to trustee		$ 312,300,000
Fair value			$ 382,500,000		$ 382,500,000
2025 Senior Notes | Senior Notes | Prior to December 15, 2020
Debt [Line Items]
Percentage of principal amount redeemed		100.00%
2025 Senior Notes | Senior Notes | After December 15, 2020
Debt [Line Items]
Percentage of principal amount redeemed		40.00%
Redemption percentage		104.875%
2025 Senior Notes | Senior Notes | Change of Control
Debt [Line Items]
Percentage of principal amount redeemed		101.00%

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Debt - Schedule of Aggregate Future Principal and Interest Payments (Details) $ in Thousands	Jun. 30, 2018 USD ($)
Debt Disclosure [Abstract]
July 2018 to June 2019	$ 109,344
July 2019 to June 2020	47,174
July 2020 to June 2021	46,774
July 2021 to June 2022	46,371
July 2022 to June 2023	$ 230,678

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Derivative Financial Instruments - Schedule of Fair Value Information Related to Derivative Financial Instruments (Details) - Designated as Hedging Instruments - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017	Jun. 30, 2017
Derivatives, Fair Value [Line Items]
Assets	$ 4,718	$ 339	$ 308
Liabilities	232	5,923	6,983
Cash Flow Hedges
Derivatives, Fair Value [Line Items]
Assets	274	339	308
Liabilities	232	2,167	4,807
Cash Flow Hedges | Interest rate swap | Other Current Assets
Derivatives, Fair Value [Line Items]
Assets	274	339	308
Cash Flow Hedges | Interest rate collar | Other Current Liabilities
Derivatives, Fair Value [Line Items]
Liabilities	25	666	1,550
Cash Flow Hedges | Interest rate collar | Other Long-Term Liabilities
Derivatives, Fair Value [Line Items]
Liabilities	207	1,501	3,257
Net Investment Hedges | Foreign exchange contracts | Other Current Assets
Derivatives, Fair Value [Line Items]
Assets	4,444
Net Investment Hedges | Foreign exchange contracts | Other Current Liabilities
Derivatives, Fair Value [Line Items]
Liabilities	$ 0	$ 3,756	$ 2,176

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Derivative Financial Instruments - Narrative (Details) - USD ($) $ in Thousands					1 Months Ended	3 Months Ended		6 Months Ended		37 Months Ended
	Jul. 03, 2017	Jul. 01, 2017	Nov. 21, 2016	Jul. 01, 2015	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Jul. 31, 2021	Dec. 31, 2017
Derivative [Line Items]
Realized net gain (loss)								$ 5,921	$ (29,110)
Initial period under interest rate protection agreements								2 years
Reduction to notional amount of derivative					$ 57,000
Annual prepayments								$ 3,978	3,810
SFS Credit Facility borrowings			$ 63,000
Mortgages
Derivative [Line Items]
Annual prepayments	$ 32,000
Mortgages | Maximum
Derivative [Line Items]
Annual prepayments	$ 25,000
Mortgages | Scenario, Forecast
Derivative [Line Items]
Annual prepayments										$ 6,250
Mortgages | York Property Mortgage
Derivative [Line Items]
Term of mortgage loan		7 years		7 years
Interest rate swap
Derivative [Line Items]
Term of derivative contract			2 years
Interest rate swap | Mortgages | York Property Mortgage
Derivative [Line Items]
Term of derivative contract				2 years
Fixed annual rate				0.877%
Annual interest rate taking into account the interest rate protection agreements						3.127%		3.127%
Interest rate swap | Credit Facility borrowings
Derivative [Line Items]
Notional value of derivative						$ 63,000		$ 63,000
Interest rate collar
Derivative [Line Items]
Notional value of derivative						$ 271,100		$ 271,100
Interest rate collar | Mortgages | York Property Mortgage
Derivative [Line Items]
Term of derivative contract		5 years
Annual interest rate taking into account the interest rate protection agreements						4.172%		4.172%
Interest rate collar | Mortgages | York Property Mortgage | Minimum
Derivative [Line Items]
Fixed annual rate		1.917%
Annual interest rate taking into account the interest rate protection agreements						4.167%		4.167%
Interest rate collar | Mortgages | York Property Mortgage | Maximum
Derivative [Line Items]
Fixed annual rate		3.75%
Annual interest rate taking into account the interest rate protection agreements						6.00%		6.00%
Foreign exchange contracts
Derivative [Line Items]
Notional value of derivative						$ 251,900		$ 251,900
Liabilities recorded within Accounts Payable and Accrued Liabilities					$ 1,400	3,700	$ 1,400	3,700	1,400		$ 800
Designated as Hedging Instruments
Derivative [Line Items]
Reduction in notional amount of derivative reclassified from Accumulated Other Comprehensive Loss into Net Income						0	(622)	$ 0	(622)
Not Designated as Hedging Instrument | Forward exchange contracts
Derivative [Line Items]
Term of derivative contract								6 months
Net investment hedges | Designated as Hedging Instruments | Foreign exchange contracts
Derivative [Line Items]
Aggregate notional value								$ 97,900	213,800
Realized net gain (loss)						(5,900)			29,100
Reduction in notional amount of derivative reclassified from Accumulated Other Comprehensive Loss into Net Income						0	0	0	0
Notional value of derivative						56,300		56,300
Cash flow hedges | Designated as Hedging Instruments
Derivative [Line Items]
Reduction in notional amount of derivative reclassified from Accumulated Other Comprehensive Loss into Net Income						$ 0	(622)	$ 0	$ (622)
Cash flow hedges | Non-operating income | Designated as Hedging Instruments | Interest rate collar
Derivative [Line Items]
Reduction in notional amount of derivative reclassified from Accumulated Other Comprehensive Loss into Net Income							$ 600

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Derivative Financial Instruments - Summary of the Effect of the Derivative Financial Instruments (Details) - Designated as Hedging Instruments - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Derivative Instruments
Gain (Loss) Recognized in Other Comprehensive Income - Effective Portion	$ 3,572	$ (1,988)	$ 3,022	$ (1,859)
Amount Reclassified from Accumulated Other Comprehensive Loss into Net Income - Effective Portion	(86)	(50)	24	35
Amount Reclassified from Accumulated Other Comprehensive Loss into Net Income - Ineffective Portion	0	622	0	622
Cash Flow Hedges
Derivative Instruments
Gain (Loss) Recognized in Other Comprehensive Income - Effective Portion	222	(534)	1,282	219
Amount Reclassified from Accumulated Other Comprehensive Loss into Net Income - Effective Portion	(86)	(50)	24	35
Amount Reclassified from Accumulated Other Comprehensive Loss into Net Income - Ineffective Portion	0	622	0	622
Cash Flow Hedges | Interest rate swap
Derivative Instruments
Gain (Loss) Recognized in Other Comprehensive Income - Effective Portion	15	(7)	95	134
Cash Flow Hedges | Interest rate swap | Interest Expense
Derivative Instruments
Amount Reclassified from Accumulated Other Comprehensive Loss into Net Income - Effective Portion	(93)	(50)	(145)	35
Amount Reclassified from Accumulated Other Comprehensive Loss into Net Income - Ineffective Portion	0	0	0	0
Cash Flow Hedges | Interest rate collar
Derivative Instruments
Gain (Loss) Recognized in Other Comprehensive Income - Effective Portion	207	(527)	1,187	85
Cash Flow Hedges | Interest rate collar | Interest Expense
Derivative Instruments
Amount Reclassified from Accumulated Other Comprehensive Loss into Net Income - Effective Portion	7	0	169	0
Amount Reclassified from Accumulated Other Comprehensive Loss into Net Income - Ineffective Portion	0	0	0	0
Cash Flow Hedges | Interest rate collar | Non-operating income
Derivative Instruments
Amount Reclassified from Accumulated Other Comprehensive Loss into Net Income - Effective Portion	0	0	0	0
Amount Reclassified from Accumulated Other Comprehensive Loss into Net Income - Ineffective Portion	0	622	0	622
Net Investment Hedges | Foreign exchange contracts
Derivative Instruments
Gain (Loss) Recognized in Other Comprehensive Income - Effective Portion	3,350	(1,454)	1,740	(2,078)
Amount Reclassified from Accumulated Other Comprehensive Loss into Net Income - Effective Portion	0	0	0	0
Amount Reclassified from Accumulated Other Comprehensive Loss into Net Income - Ineffective Portion	$ 0	$ 0	$ 0	$ 0

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Sale of Pink Diamond (Details) - USD ($) $ in Thousands	1 Months Ended	3 Months Ended			6 Months Ended
	Apr. 30, 2017	Jun. 30, 2018	Sep. 30, 2017	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017	Jun. 30, 2016
Product Information [Line Items]
Undivided legal and beneficial ownership interest sold (as a percent)								50.00%
Cash received for undivided legal and beneficial interest								$ 34,200
Total purchase price		$ 40,106		$ 19,937	$ 56,342	$ 91,314
Carrying value of the Pink Diamond		32,639		131,193	32,639	131,193	$ 74,483
Cost of Inventory Sales		$ 42,414		22,255	$ 58,409	93,662
Pink Diamond
Product Information [Line Items]
Total purchase price	$ 71,200
Carrying value of the Pink Diamond				$ 68,400		$ 68,400
Gain on sale of Pink Diamond			$ 400
Cost of Inventory Sales			$ 70,800

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Supplemental Condensed Consolidated Balance Sheet Information - Schedule of Prepaid Expenses and Other Current Assets (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017	Jun. 30, 2017
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Prepaid expenses	$ 25,586	$ 25,418	$ 27,293
Derivative financial instruments (see Note 9)	274	339	308
Insurance recoveries	2,335	0	0
Other	15,067	6,253	17,854
Total Prepaid Expenses and Other Current Assets	$ 43,262	$ 32,010	$ 45,455

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Supplemental Condensed Consolidated Cash Flow Information - Schedule of Restricted Cash Classified Within Current Assets (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017	Jun. 30, 2017	Dec. 31, 2016
Cash and Cash Equivalents [Line Items]
Cash and cash equivalents	$ 432,357	$ 544,432	$ 516,402
Total restricted cash	46,421	379,494	58,590
Cash, cash equivalents, and restricted cash	478,778	923,926	574,992	$ 556,201
Escrow deposit	15,300
Current Assets
Cash and Cash Equivalents [Line Items]
Total restricted cash	28,979	361,578	41,258
Other long-term assets
Cash and Cash Equivalents [Line Items]
Total restricted cash	17,442	17,916	17,332
Consignor funds held in legally segregated accounts
Cash and Cash Equivalents [Line Items]
Total restricted cash	23,528	46,029	33,164
Funds deposited with the trustee for the redemption of the 2022 Senior Notes
Cash and Cash Equivalents [Line Items]
Total restricted cash	0	312,250	0
Cash Management Account related to the York Property Mortgage (see Note 8)
Cash and Cash Equivalents [Line Items]
Total restricted cash	5,264	3,107	7,434
Other
Cash and Cash Equivalents [Line Items]
Total restricted cash	$ 187	$ 192	$ 660

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Supplemental Condensed Consolidated Balance Sheet Information - Schedule of Other Long-Term Assets (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017	Jun. 30, 2017
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Defined benefit pension plan asset	$ 107,647	$ 108,826	$ 86,317
Equity method investments	46,789	46,905	47,299
Trust assets related to deferred compensation liability	30,017	26,240	25,128
Restricted cash	17,442	17,916	17,332
Insurance recoveries	12,782	12,242	14,527
Other	15,136	15,479	2,392
Total Other Long-Term Assets	$ 229,813	$ 227,608	$ 192,995

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Supplemental Condensed Consolidated Cash Flow Information (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
(Increase) decrease in:
Prepaid expenses and other current assets	$ (8,233)	$ 2,342
Other long-term assets	(3,611)	(1,306)
Income tax receivables and deferred income tax assets	(9,782)	(20,896)
(Decrease) increase in:
Accounts payable and accrued liabilities and other liabilities	(23,870)	(20,575)
Accrued income taxes and deferred income tax liabilities	4,126	(2,872)
Total changes in other operating assets and liabilities	$ (41,370)	$ (43,307)

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Supplemental Condensed Consolidated Balance Sheet Information - Schedule of Other Long-Term Liabilities (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017	Jun. 30, 2017
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Deferred compensation liability	$ 29,605	$ 25,614	$ 24,477
Acquisition earn-out consideration	8,750	17,500	17,500
Interest rate collar liability (see Note 9)	207	1,501	3,257
Other	7,609	6,809	6,623
Total Other Long-Term Liabilities	$ 46,171	$ 51,424	$ 51,857

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Shareholders' Equity and Dividends - Narrative (Details) - USD ($)				6 Months Ended
	Feb. 28, 2018	Mar. 17, 2014	Jan. 29, 2014	Jun. 30, 2018	Jun. 30, 2017	Aug. 03, 2018
Dividends Payable [Line Items]
Increase to share repurchase authorization	$ 100,000,000
Aggregate share repurchase authorization	$ 195,700,000.0
Accrued dividend equivalents paid upon vesting				$ 0	$ 2,000,000
Subsequent Event
Dividends Payable [Line Items]
Remaining authorized repurchase amount						$ 133,200,000
Special dividend
Dividends Payable [Line Items]
Special dividend declared			$ 300,000,000
Special dividend declared (in dollars per share)			$ 4.34
Dividends accrued		$ 10,000,000

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Shareholders' Equity and Dividends - Schedule of Information Regarding Common Stock Repurchase Program (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Equity [Abstract]
Shares repurchased (in shares)	1,193	740
Aggregate purchase price	$ 62,497	$ 33,940
Average price per share (in dollars per share)	$ 52.40	$ 45.86

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Accumulated Other Comprehensive Loss - Summary of Changes in Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Increase (Decrease) in Stockholders' Equity
Balance at beginning of period			$ 616,940
Reclassifications from accumulated other comprehensive gain (loss), net of tax	$ (5)	$ 787	187	$ 1,080
Total other comprehensive (loss) income	(10,639)	4,754	(3,797)	7,572
Balance at end of period	606,744	543,143	606,744	543,143
AOCI Attributable to Parent
Increase (Decrease) in Stockholders' Equity
Balance at end of period	(66,263)	(82,786)	(66,263)	(82,786)
Currency Translation Adjustments
Increase (Decrease) in Stockholders' Equity
Balance at beginning of period	(67,280)	(86,853)	(74,505)	(89,478)
Other comprehensive income (loss) before reclassifications, net of tax	(14,238)	6,526	(7,013)	9,151
Other comprehensive income (loss) before reclassifications, tax	0	835	400	1,421
Total other comprehensive (loss) income	(14,238)	6,526	(7,013)	9,151
Balance at end of period	(81,518)	(80,327)	(81,518)	(80,327)
Cash Flow & Net Investment Hedges | Cash Flow Hedges
Increase (Decrease) in Stockholders' Equity
Balance at beginning of period	141	(2,826)	(1,029)	(3,664)
Other comprehensive income (loss) before reclassifications, net of tax	222	(534)	1,282	219
Other comprehensive income (loss) before reclassifications, tax	73	(331)	423	135
Reclassifications from accumulated other comprehensive gain (loss), net of tax	(86)	572	24	657
Reclassifications from accumulated other comprehensive gain (loss), tax	(28)	354	8	407
Total other comprehensive (loss) income	136	38	1,306	876
Balance at end of period	277	(2,788)	277	(2,788)
Cash Flow & Net Investment Hedges | Net Investment Hedges
Increase (Decrease) in Stockholders' Equity
Balance at beginning of period	11,949	15,994	13,559	16,618
Other comprehensive income (loss) before reclassifications, net of tax	3,350	(1,454)	1,740	(2,078)
Other comprehensive income (loss) before reclassifications, tax	1,904	(885)	569	1,270
Total other comprehensive (loss) income	3,350	(1,454)	1,740	(2,078)
Balance at end of period	15,299	14,540	15,299	14,540
Defined Benefit Pension Plan
Increase (Decrease) in Stockholders' Equity
Balance at beginning of period	(434)	(13,855)	(491)	(13,834)
Other comprehensive income (loss) before reclassifications, net of tax	32	(571)	7	(800)
Reclassifications from accumulated other comprehensive gain (loss), net of tax	81	215	163	423
Reclassifications from accumulated other comprehensive gain (loss), tax	15	42	32	84
Total other comprehensive (loss) income	113	(356)	170	(377)
Balance at end of period	(321)	(14,211)	(321)	(14,211)
Currency translation adjustments
Increase (Decrease) in Stockholders' Equity
Other comprehensive income (loss) before reclassifications, net of tax	32	(571)	7	(800)
Prior service cost amortization, net of tax
Increase (Decrease) in Stockholders' Equity
Reclassifications from accumulated other comprehensive gain (loss), net of tax	(21)	(20)	(43)	(39)
Reclassifications from accumulated other comprehensive gain (loss), tax	(4)	(3)	(8)	(7)
Actuarial loss amortization, net of tax
Increase (Decrease) in Stockholders' Equity
Reclassifications from accumulated other comprehensive gain (loss), net of tax	102	235	206	462
Reclassifications from accumulated other comprehensive gain (loss), tax	$ 19	$ 45	$ 40	$ 91

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Accumulated Other Comprehensive Loss - Summary of Reclassification Adjustments (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Reclassification adjustments, net of tax	$ (5)	$ 787	$ 187	$ 1,080
Defined Benefit Pension Plan
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Reclassification adjustment, before tax	96	257	195	507
Tax effect	(15)	(42)	(32)	(84)
Reclassification adjustments, net of tax	81	215	163	423
Prior service cost amortization
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Reclassification adjustment, before tax	(26)	(23)	(52)	(46)
Tax effect	4	3	8	7
Reclassification adjustments, net of tax	(21)	(20)	(43)	(39)
Actuarial loss amortization
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Reclassification adjustment, before tax	122	280	247	553
Tax effect	(19)	(45)	(40)	(91)
Reclassification adjustments, net of tax	102	235	206	462
Reclassification out of Accumulated Other Comprehensive Income | Cash Flow Hedges
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Reclassification adjustment, before tax	(114)	926	32	1,064
Tax effect	28	(354)	(8)	(407)
Reclassification adjustments, net of tax	$ (86)	$ 572	$ 24	$ 657

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Commitments and Contingencies (Details) $ in Millions	Jun. 30, 2018 USD ($)
Commitments and Contingencies Disclosure [Abstract]
Aggregate remaining commitment for salaries and other cash compensation, excluding any participation in incentive compensation programs	$ 14.1
Guarantee Of Collection	$ 26.8

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Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended
	Jun. 30, 2018	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Provisional income tax expense	$ 2.3	$ 1.2
Liability for the one-time mandatory transition tax		40.4
Expense to reduce the value of net deferred tax assets	2.6	$ 19.8
Provisional income tax payable	$ 20.2

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Uncertain Tax Positions (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2018	Dec. 31, 2017	Jun. 30, 2017
Income Tax Disclosure [Abstract]
Unrecognized tax benefits, excluding interest and penalties	$ 12.3	$ 12.3	$ 13.2	$ 20.4
Net decrease in unrecognized tax benefits		0.9
Unrecognized tax benefits that would favorably affect effective income tax rate	4.5	4.5	$ 4.1	$ 9.6
Reasonably possible decrease in balance of unrecognized tax benefits within 12 months	2.6	$ 2.6
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense	$ 0.1

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Auction Guarantees (Details) - USD ($)		3 Months Ended
	Aug. 03, 2018	Jun. 30, 2018	Dec. 31, 2017	Jun. 30, 2017
Guarantor Obligations [Line Items]
Outstanding auction guarantees		$ 31,200,000
Irrevocable bids		31,200,000
Estimated fair value of obligation to perform under outstanding auction guarantees		900,000	$ 900,000	$ 400,000
Auction guarantee advances outstanding		$ 0	$ 0	$ 0
Subsequent Event
Guarantor Obligations [Line Items]
Outstanding auction guarantees	$ 194,000,000
Irrevocable bids	81,200,000
Guarantor Obligations, Minimum Exposure, Undiscounted	112,800,000
Auction guarantee advances outstanding	$ 1,000,000

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Share-Based Payments - Schedule of Compensation Expense for Share-Based Payments (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Pre-tax	$ 6,312	$ 5,946	$ 14,689	$ 12,015
After-tax	$ 5,087	$ 3,940	$ 11,726	$ 7,997

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Share-Based Payments - Narrative (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	May 03, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Excess tax benefit related to share-based payments	$ 1.2	$ 2.6
Unrecognized compensation expense related to the unvested portion of share-based payments	$ 37.3
Weighted average period of amortization	2 years 3 months
Shares granted (in shares)	686,000
Company's Incentive Compensation Programs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Grant date fair value	$ 32.3
Employee Stock Option and SARS
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares from the available pool (in shares)			1
RSUs and PSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares from the available pool (in shares)			2.14
Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	3 years
Restricted Stock Units (RSUs) | Incremental Vesting | Company's Incentive Compensation Programs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	3 years
Grant date fair value	$ 19.1
Shares granted (in shares)	402,899
Performance Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	3 years
Performance Shares | Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	3 years
Performance Shares | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	4 years
Performance Shares | Cliff Vesting
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Grant date fair value	$ 13.2
Shares granted (in shares)	283,019
Performance Shares | Cliff Vesting | Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total maximum vesting opportunity of initial award (as a percent)	100.00%
Performance Shares | Cliff Vesting | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted (in shares)	566,038
Total maximum vesting opportunity of initial award (as a percent)	200.00%
Restricted Shares, RSU's And PSU's
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares available for future awards (in shares)	6,200,000
Aggregate fair value of RSU's and PSU's that vested	$ 26.8	$ 35.9

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Share-Based Payments - Schedule of Changes to the Number of Outstanding RSU's, PSU's, and Restricted Shares (Details) shares in Thousands	6 Months Ended
	Jun. 30, 2018 $ / shares shares
Restricted Shares, RSU's and PSU's
Outstanding, beginning balance (in shares) | shares	1,922
Granted (in shares) | shares	686
Vested (in shares) | shares	(526)
Canceled (in shares) | shares	(157)
Outstanding, ending balance (in shares) | shares	1,925
Weighted Average Grant Date Fair Value
Outstanding, beginning balance (in dollars per share) | $ / shares	$ 36.59
Granted (in dollars per share) | $ / shares	47.06
Vested (in dollars per share) | $ / shares	38.95
Canceled (in dollars per share) | $ / shares	39.83
Outstanding, ending balance (in dollars per share) | $ / shares	$ 39.41

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Share-Based Payments - Stock Options Narrative (Details) - $ / shares	3 Months Ended	6 Months Ended
	Dec. 31, 2017	Jun. 30, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options expiration period		10 years
Stock options exercised (in shares)	50,000
Exercise price (in dollars per share)	$ 22.11
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period		4 years
Options outstanding and exercisable (in shares)		0
Options exercisable (in shares)		0

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Share-Based Payments - Directors Stock Plan Narrative (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Credits related to the voluntary separation incentive programs	$ 6,312	$ 5,946	$ 14,689	$ 12,015
Number of deferred stock units outstanding (in shares)	1,925,000		1,925,000		1,922,000
Director's Stock Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Credits related to the voluntary separation incentive programs	$ 300	$ 300	$ 600	$ 500
Number of deferred stock units outstanding (in shares)	171,165		171,165
Shares available for future awards (in shares)	104,467		104,467

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Earnings Per Share - Computation of Basic and Diluted (Loss) Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Numerator:
Net income attributable to Sotheby's	$ 57,282	$ 76,891	$ 50,760	$ 65,566
Less: Net income attributable to participating securities	844	1,176	763	1,019
Net income attributable to Sotheby’s common shareholders	$ 56,438	$ 75,715	$ 49,997	$ 64,547
Denominator:
Weighted average basic shares outstanding (shares)	51,780	52,716	52,122	52,866
Basic earnings per share - Sotheby’s common shareholders (USD per share)	$ 1.09	$ 1.44	$ 0.96	$ 1.22
Diluted:
Net income attributable to Sotheby’s	$ 57,282	$ 76,891	$ 50,760	$ 65,566
Less: Net income attributable to participating securities	844	1,176	763	1,019
Net income attributable to Sotheby’s common shareholders	$ 56,438	$ 75,715	$ 49,997	$ 64,547
Performance share units	259	151	197	293
Deferred stock units	171	159	172	157
Stock options	0	28	0	26
Weighted average dilutive potential common shares outstanding	430	338	369	476
Weighted average diluted shares outstanding (shares)	52,210	53,054	52,491	53,342
Diluted earnings per share - Sotheby's common shareholders (USD per share)	$ 1.08	$ 1.43	$ 0.95	$ 1.21

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Earnings Per Share - Narrative (Details) - shares shares in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Earnings Per Share [Abstract]
Potential common shares excluded from computation of diluted earnings per share	1	1	1	1

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Restructuring Charges (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 2,146	$ 0	$ 2,146	$ 0
Severance
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 2,100		$ 2,100

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Related Party Transactions (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Related Party Transactions [Abstract]
Agency commissions and fees	$ 3.2	$ 1.0	$ 3.4	$ 4.6
Inventory sales			5.3
Related party receivable balance	3.6	0.0	3.6	0.0	$ 0.0
Amounts owed to related party	$ 0.4	$ 0.0	$ 0.4	$ 0.0	$ 0.4