10-Q

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, D.C. 20549

FORM 10-Q

(Mark One)

x QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

For the quarterly period ended September 30, 2017

or

o TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

For the transition period from to .

Commission File Number: 001-32269

EXTRA SPACE STORAGE INC.

(Exact name of registrant as specified in its charter)

Maryland	20-1076777
(State or other jurisdiction of incorporation or organization)	(I.R.S. Employer Identification No.)

2795 East Cottonwood Parkway, Suite 300

Salt Lake City, Utah 84121

(Address of principal executive offices)

Registrant’s telephone number, including area code: (801) 365-4600

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  x    No  o

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 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  x    No  o

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. (Check one):

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

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. o

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

The number of shares outstanding of the registrant’s common stock, par value $0.01 per share, as of October 31, 2017, was 126,007,803.

EXTRA SPACE STORAGE INC.

TABLE OF CONTENTS

STATEMENT ON FORWARD-LOOKING INFORMATION	4
PART I. FINANCIAL INFORMATION	5
ITEM 1. FINANCIAL STATEMENTS	5
NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS (unaudited)	11
ITEM 2. MANAGEMENT’S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS	27
ITEM 3. QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK	43
ITEM 4. CONTROLS AND PROCEDURES	44
PART II. OTHER INFORMATION	45
ITEM 1. LEGAL PROCEEDINGS	45
ITEM 1A. RISK FACTORS	45
ITEM 2. UNREGISTERED SALES OF EQUITY SECURITIES AND USE OF PROCEEDS	45
ITEM 3. DEFAULTS UPON SENIOR SECURITIES	45
ITEM 4. MINE SAFETY DISCLOSURES	45
ITEM 5. OTHER INFORMATION	45
ITEM 6. EXHIBITS	46
SIGNATURES	47

3

STATEMENT ON FORWARD-LOOKING INFORMATION

Certain information presented in this report contains “forward-looking statements” within the meaning of the federal securities laws. Forward-looking statements include statements concerning our plans, objectives, goals, strategies, future events, future revenues or performance, capital expenditures, financing needs, plans or intentions relating to acquisitions and other information that is not historical information. In some cases, forward-looking statements can be identified by terminology such as “believes,” “expects,” “estimates,” “may,” “will,” “should,” “anticipates” or “intends,” or the negative of such terms or other comparable terminology, or by discussions of strategy. We may also make additional forward-looking statements from time to time. All such subsequent forward-looking statements, whether written or oral, by us or on our behalf, are also expressly qualified by these cautionary statements.

All forward-looking statements, including without limitation, management’s examination of historical operating trends and estimates of future earnings, are based upon our current expectations and various assumptions. Our expectations, beliefs and projections are expressed in good faith and we believe there is a reasonable basis for them, but there can be no assurance that management’s expectations, beliefs and projections will result or be achieved. All forward-looking statements apply only as of the date made. We undertake no obligation to publicly update or revise forward-looking statements which may be made to reflect events or circumstances after the date made or to reflect the occurrence of unanticipated events.

There are a number of risks and uncertainties that could cause our actual results to differ materially from the forward-looking statements contained in or contemplated by this report. Any forward-looking statements should be considered in light of the risks referenced in “Part II. Item 1A. Risk Factors” below and in “Part I. Item 1A. Risk Factors” included in our most recent Annual Report on Form 10-K. Such factors include, but are not limited to:

• adverse changes in general economic conditions, the real estate industry and the markets in which we operate;

• failure to close pending acquisitions on expected terms, or at all;

• the effect of competition from new and existing stores or other storage alternatives, which could cause rents and occupancy rates to decline;

• difficulties in our ability to evaluate, finance, complete and integrate acquisitions and developments successfully and to lease up those stores, which could adversely affect our profitability;

• potential liability for uninsured losses and environmental contamination;

• the impact of the regulatory environment as well as national, state and local laws and regulations including, without limitation, those governing real estate investment trusts (“REITs”), tenant reinsurance and other aspects of our business, which could adversely affect our results;

• disruptions in credit and financial markets and resulting difficulties in raising capital or obtaining credit at reasonable rates or at all, which could impede our ability to grow;

• increased interest rates and operating costs;

• the failure to effectively manage our growth and expansion into new markets or to successfully operate acquired properties and operations;

• reductions in asset valuations and related impairment charges;

• the failure of our joint venture partners to fulfill their obligations to us or their pursuit of actions that are inconsistent with our objectives;

• the failure to maintain our REIT status for U.S. federal income tax purposes;

• economic uncertainty due to the impact of natural disasters, war or terrorism, which could adversely affect our business plan; and

• difficulties in our ability to attract and retain qualified personnel and management members.

4

PART I. FINANCIAL INFORMATION

ITEM 1. FINANCIAL STATEMENTS

Extra Space Storage Inc.

Condensed Consolidated Balance Sheets

(amounts in thousands, except share data)

	September 30, 2017			December 31, 2016
	(Unaudited)
Assets:
Real estate assets, net	$	6,770,086		$	6,770,447
Investments in unconsolidated real estate ventures	78,512			79,570
Cash and cash equivalents	63,732			43,858
Restricted cash	17,277			13,884
Receivables from related parties and affiliated real estate joint ventures	4,618			16,611
Other assets, net	152,730			167,076
Total assets	$	7,086,955		$	7,091,446
Liabilities, Noncontrolling Interests and Equity:
Notes payable, net	$	3,568,113		$	3,213,588
Exchangeable senior notes, net	602,485			610,314
Notes payable to trusts, net	117,414			117,321
Revolving lines of credit	25,000			365,000
Accounts payable and accrued expenses	114,247			101,388
Other liabilities	85,971			87,669
Total liabilities	4,513,230			4,495,280
Commitments and contingencies
Noncontrolling Interests and Equity:
Extra Space Storage Inc. stockholders' equity:
Preferred stock, $0.01 par value, 50,000,000 shares authorized, no shares issued or outstanding	—			—
Common stock, $0.01 par value, 500,000,000 shares authorized, 126,007,207 and 125,881,460 shares issued and outstanding at September 30, 2017 and December 31, 2016, respectively	1,260			1,259
Additional paid-in capital	2,567,234			2,566,120
Accumulated other comprehensive income	17,731			16,770
Accumulated deficit	(370,959		)	(339,257		)
Total Extra Space Storage Inc. stockholders' equity	2,215,266			2,244,892
Noncontrolling interest represented by Preferred Operating Partnership units, net of $120,230 notes receivable	154,432			147,920
Noncontrolling interests in Operating Partnership	202,232			203,354
Other noncontrolling interests	1,795			—
Total noncontrolling interests and equity	2,573,725			2,596,166
Total liabilities, noncontrolling interests and equity	$	7,086,955		$	7,091,446

See accompanying notes to unaudited condensed consolidated financial statements.

5

Extra Space Storage Inc.

Condensed Consolidated Statements of Operations

(amounts in thousands, except share data)

(unaudited)

	For the Three Months Ended September 30,						For the Nine Months Ended September 30,
	2017			2016			2017			2016
Revenues:
Property rental	$	248,589		$	224,451		$	720,878		$	635,730
Tenant reinsurance	25,882			22,727			73,050			64,936
Management fees and other income	9,685			10,005			29,239			30,193
Total revenues	284,156			257,183			823,167			730,859
Expenses:
Property operations	70,430			62,341			204,370			185,883
Tenant reinsurance	6,272			4,093			13,996			12,345
Acquisition related costs and other	—			1,933			—			9,124
General and administrative	19,498			19,537			60,171			63,451
Depreciation and amortization	48,075			46,555			144,139			133,402
Total expenses	144,275			134,459			422,676			404,205
Income from operations	139,881			122,724			400,491			326,654
Gain (loss) on real estate transactions, earnout from prior acquisition and impairment of real estate	—			—			(6,019		)	9,814
Interest expense	(39,766		)	(33,494		)	(113,192		)	(97,655		)
Non-cash interest expense related to amortization of discount on equity component of exchangeable senior notes	(1,268		)	(1,243		)	(3,827		)	(3,716		)
Interest income	869			1,358			2,797			4,697
Interest income on note receivable from Preferred Operating Partnership unit holder	532			1,213			2,404			3,638
Income before equity in earnings of unconsolidated real estate ventures and income tax expense	100,248			90,558			282,654			243,432
Equity in earnings of unconsolidated real estate ventures	3,990			3,625			11,407			9,813
Equity in earnings of unconsolidated real estate ventures - gain on sale of real estate assets and purchase of joint venture partners' interests	—			37,509			—			64,432
Income tax expense	(3,163		)	(4,466		)	(9,154		)	(11,004		)
Net income	101,075			127,226			284,907			306,673
Net income allocated to Preferred Operating Partnership noncontrolling interests	(3,394		)	(4,144		)	(10,775		)	(10,758		)
Net income allocated to Operating Partnership and other noncontrolling interests	(3,917		)	(4,994		)	(11,080		)	(12,191		)
Net income attributable to common stockholders	$	93,764		$	118,088		$	263,052		$	283,724
Earnings per common share
Basic	$	0.74		$	0.94		$	2.09		$	2.26
Diluted	$	0.74		$	0.93		$	2.07		$	2.24
Weighted average number of shares
Basic	125,717,517			125,752,291			125,665,787			125,244,761
Diluted	133,044,473			133,763,472			133,008,622			132,476,691
Cash dividends paid per common share	$	0.78		$	0.78		$	2.34		$	2.15

See accompanying notes to unaudited condensed consolidated financial statements.

6

Extra Space Storage Inc.

Condensed Consolidated Statements of Comprehensive Income

(amounts in thousands)

(unaudited)

	For the Three Months Ended September 30,				For the Nine Months Ended September 30,
	2017		2016		2017		2016
Net income	$	101,075	$	127,226	$	284,907	$	306,673
Other comprehensive income (loss):
Change in fair value of interest rate swaps	759		13,374		992		(36,571		)
Total comprehensive income	101,834		140,600		285,899		270,102
Less: comprehensive income attributable to noncontrolling interests	7,342		9,761		21,886		21,120
Comprehensive income attributable to common stockholders	$	94,492	$	130,839	$	264,013	$	248,982

See accompanying notes to unaudited condensed consolidated financial statements.

7

Extra Space Storage Inc.

Condensed Consolidated Statement of Noncontrolling Interests and Equity

(amounts in thousands, except share data)

(unaudited)

	Noncontrolling Interests																		Extra Space Storage Inc. Stockholders' Equity
	Preferred Operating Partnership
	Series A			Series B			Series C			Series D			Operating Partnership			Other			Shares		Par Value		Additional Paid-in Capital			Accumulated Other Comprehensive Income		Accumulated Deficit			Total Noncontrolling Interests and Equity
Balances at December 31, 2016	$	14,385		$	41,902		$	10,730		$	80,903		$	203,354		$	—		125,881,460		$	1,259	$	2,566,120		$	16,770	$	(339,257	)	$	2,596,166
Issuance of common stock upon the exercise of options	—			—			—			—			—			—			38,418		—		1,266			—		—			1,266
Restricted stock grants issued	—			—			—			—			—			—			93,796		1		(1		)	—		—			—
Restricted stock grants cancelled	—			—			—			—			—			—			(6,467	)	—		—			—		—			—
Compensation expense related to stock-based awards	—			—			—			—			—			—			—		—		7,244			—		—			7,244
Issuance of Operating Partnership units in conjunction with acquisitions	—			—			—			—			2,000			—			—		—		—			—		—			2,000
Redemption of Operating Partnership units for cash	—			—			—			—			(1,238		)	—			—		—		(1,272		)	—		—			(2,510		)
Issuance of Preferred D Units in the Operating Partnership in conjunction with acquisitions	—			—			—			6,810			—			—			—		—		—			—		—			6,810
Noncontrolling Interest in consolidated joint venture	—			—			—			—			—			1,868			—		—		—			—		—			1,868
Repurchase of equity portion of 2013 exchangeable senior notes	—			—			—			—			—			—			—		—		(6,123		)	—		—			(6,123		)
Net income (loss)	4,294			1,886			2,028			2,567			11,153			(73		)	—		—		—			—		263,052			284,907
Other comprehensive income	4			—			—			—			27			—			—		—		—			961		—			992
Distributions to Operating Partnership units held by noncontrolling interests	(4,596		)	(1,886		)	(2,028		)	(2,567		)	(13,064		)	—			—		—		—			—		—			(24,141		)
Dividends paid on common stock at $2.34 per share	—			—			—			—			—			—			—		—		—			—		(294,754		)	(294,754		)
Balances at September 30, 2017	$	14,087		$	41,902		$	10,730		$	87,713		$	202,232		$	1,795		126,007,207		$	1,260	$	2,567,234		$	17,731	$	(370,959	)	$	2,573,725

See accompanying notes to unaudited condensed consolidated financial statements.

8

Extra Space Storage Inc.

Condensed Consolidated Statements of Cash Flows

(amounts in thousands)

(unaudited) 

	For the Nine Months Ended September 30,
	2017			2016
Cash flows from operating activities:
Net income	$	284,907		$	306,673
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	144,139			133,402
Amortization of deferred financing costs	9,246			9,388
Non-cash interest expense related to amortization of discount on equity component of exchangeable senior notes	3,827			3,716
Non-cash interest expense related to amortization of premium on notes payable	—			(828		)
Compensation expense related to stock-based awards	7,244			6,008
Gain on sale of real estate assets and purchase of joint venture partner's interest	—			(64,432		)
(Gain) loss on real estate transactions, earnout from prior acquisition and impairment of real estate	6,019			(9,814		)
Distributions from unconsolidated real estate ventures in excess of earnings	3,498			3,071
Changes in operating assets and liabilities:
Receivables from related parties and affiliated real estate joint ventures	195			923
Other assets	(15,498		)	(16,059		)
Accounts payable and accrued expenses	6,425			10,938
Other liabilities	(373		)	3,173
Net cash provided by operating activities	449,629			386,159
Cash flows from investing activities:
Acquisition of real estate assets	(119,040		)	(763,246		)
Development and redevelopment of real estate assets	(20,670		)	(18,492		)
Proceeds from sale of real estate assets, investments in real estate ventures and other assets	18,565			56,786
Change in restricted cash	(3,393		)	14,296
Investment in unconsolidated real estate ventures	(3,021		)	(25,690		)
Return of investment in unconsolidated real estate ventures	581			11,991
Purchase/issuance of notes receivable	—			(18,530		)
Principal payments received from notes receivable	44,869			41,393
Purchase of equipment and fixtures	(5,635		)	(2,818		)
Net cash used in investing activities	(87,744		)	(704,310		)
Cash flows from financing activities:
Proceeds from the sale of common stock, net of offering costs	—			123,423
Repurchase of exchangeable senior notes	(19,726		)	(22,192		)
Proceeds from notes payable and revolving lines of credit	1,023,170			1,026,975
Principal payments on notes payable and revolving lines of credit	(1,020,144		)	(565,541		)
Deferred financing costs	(5,172		)	(6,700		)
Net proceeds from exercise of stock options	1,266			312
Proceeds from termination of interest rate cap	—			1,650
Payment of earnout from prior acquisition	—			(4,600		)
Redemption of Operating Partnership units held by noncontrolling interests	(2,510		)	—
Dividends paid on common stock	(294,754		)	(269,630		)
Distributions to noncontrolling interests	(24,141		)	(22,653		)
Net cash provided by (used in) financing activities	(342,011		)	261,044
Net increase in cash and cash equivalents	19,874			(57,107		)
Cash and cash equivalents, beginning of the period	43,858			75,799
Cash and cash equivalents, end of the period	$	63,732		$	18,692

9

Extra Space Storage Inc.

Condensed Consolidated Statements of Cash Flows

(amounts in thousands)

(unaudited) 

	For the Nine Months Ended September 30,
	2017			2016
Supplemental schedule of cash flow information
Interest paid	$	107,144		$	94,585
Income taxes paid	8,086			10,813
Supplemental schedule of noncash investing and financing activities:
Redemption of Operating Partnership units held by noncontrolling interests for common stock:
Noncontrolling interests in Operating Partnership	$	—		$	(839	)
Common stock and paid-in capital	—			839
Tax effect from vesting of restricted stock grants and option exercises
Other assets	$	—		$	1,322
Additional paid-in capital	—			(1,322		)
Acquisitions of real estate assets
Real estate assets, net	$	20,100		$	65,960
Value of Operating Partnership units issued	(8,810		)	(56,237		)
Notes payable assumed	(9,463		)	(9,723		)
Other noncontrolling interests	(1,827		)	—
Accrued construction costs and capital expenditures
Acquisition of real estate assets	$	4,874		$	8,839
Development and redevelopment of real estate assets	1,558			—
Other liabilities	(6,432		)	(8,839		)
Distribution of real estate from investments in unconsolidated real estate ventures
Real estate assets, net	$	—		$	21,587
Investments in unconsolidated real estate ventures	—			(21,587		)
Disposition of real estate assets
Real estate assets, net	$	—		$	(7,689	)
Operating Partnership units redeemed	—			7,689
Acquisition of noncontrolling interests
Operating Partnership units issued	$	—		$	(800	)
Other noncontrolling interests	—			162
Additional paid-in capital	—			638

See accompanying notes to unaudited condensed consolidated financial statements.

10

EXTRA SPACE STORAGE INC.

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS (unaudited)

Amounts in thousands, except store and share data, unless otherwise stated

1. ORGANIZATION

Extra Space Storage Inc. (the “Company”) is a fully-integrated, self-administered and self-managed real estate investment trust (“REIT”), formed as a Maryland corporation on April 30, 2004, to own, operate, manage, acquire, develop and redevelop professionally managed self-storage properties (“stores”) located throughout the United States. The Company continues the business of Extra Space Storage LLC and its subsidiaries, which had engaged in the self-storage business since 1977. The Company’s interests in its stores is held through its operating partnership, Extra Space Storage LP (the “Operating Partnership”), which was formed on May 5, 2004. The Company’s primary assets are general partner and limited partner interests in the Operating Partnership. This structure is commonly referred to as an umbrella partnership REIT, or UPREIT. The Company has elected to be taxed as a REIT under the Internal Revenue Code of 1986, as amended. To the extent the Company continues to qualify as a REIT, it will not be subject to tax, with certain limited exceptions, on the taxable income that is distributed to its stockholders.

The Company invests in stores by acquiring wholly-owned stores or by acquiring an equity interest in real estate entities. At September 30, 2017, the Company had direct and indirect equity interests in 1,028 stores. In addition, the Company managed 485 stores for third parties, bringing the total number of stores which it owns and/or manages to 1,513. These stores are located in 38 states, Washington, D.C. and Puerto Rico.

The Company operates in three distinct segments: (1) rental operations; (2) tenant reinsurance; and (3) property management, acquisition and development. The rental operations activities include rental operations of stores in which we have an ownership interest. No single tenant accounts for more than 5.0% of rental income. Tenant reinsurance activities include the reinsurance of risks relating to the loss of goods stored by tenants in the Company’s stores. The Company’s property management, acquisition and development activities include managing, acquiring and developing stores.

2. BASIS OF PRESENTATION

The accompanying unaudited condensed consolidated financial statements of the Company are presented on the accrual basis of accounting in accordance with U.S. generally accepted accounting principles (“GAAP”) for interim financial information, and in accordance with the instructions to Form 10-Q and Article 10 of Regulation S-X. Accordingly, they may not include all of the information and footnotes required by GAAP for complete financial statements. In the opinion of management, all adjustments (including normal recurring accruals) considered necessary for a fair presentation have been included. Operating results for the three and nine months ended September 30, 2017 are not necessarily indicative of results that may be expected for the year ending December 31, 2017. The condensed consolidated balance sheet as of December 31, 2016 has been derived from the Company’s audited financial statements as of that date, but does not include all of the information and footnotes required by GAAP for complete financial statements. For further information refer to the consolidated financial statements and footnotes thereto included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2016, as filed with the Securities and Exchange Commission.

Recently Issued Accounting Standards

In May 2014, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) 2014-09, “Revenue from Contracts with Customers,” which amends the guidance for revenue recognition to replace numerous, industry-specific requirements and converges areas under this topic with those of the International Financial Reporting Standards. ASU 2014-09 outlines a five-step process for customer contract revenue recognition that focuses on transfer of control, as opposed to transfer of risk and rewards. The amendment also requires enhanced disclosures regarding the nature, amount, timing and uncertainty of revenues and cash flows from contracts with customers. The new standard will become effective for annual and interim periods beginning after December 15, 2017 with early adoption permitted. The Company has determined that its property rental revenue and tenant reinsurance revenue will not be subject to the guidance in ASU 2014-09, as they qualify as lease contracts and insurance contracts, which are excluded from its scope. The Company's management fee revenue will be included in the scope of the standard. However, based on the Company's initial assessment, it appears that revenue recognized under the standard will not differ materially from revenue recognized under existing guidance. The Company continues to assess the potential impacts of ASU 2014-09. The Company anticipates adopting the standard using the modified retrospective transition method as of January 1, 2018.

11

EXTRA SPACE STORAGE INC.

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS (unaudited) (continued)

Amounts in thousands, except store and share data, unless otherwise stated

In February 2016, the FASB issued ASU 2016-02, “Leases (Topic 842),” which modifies the accounting for leases, intending to increase transparency and comparability of organizations by requiring balance sheet presentation of leased assets and increased financial statement disclosure of leasing arrangements. ASU 2016-02 will require entities to recognize a liability for their lease obligations and a corresponding asset representing the right to use the underlying asset over the lease term. Lease obligations are to be measured at their present value and accounted for using the effective interest method. The accounting for the leased asset will differ slightly depending on whether the agreement is deemed to be a financing or operating lease. For financing leases, the leased asset is depreciated on a straight-line basis and depreciation expense is recorded separately from the interest expense in the statements of operations, resulting in higher expense in the earlier part of the lease term. For operating leases, the depreciation and interest expense components are combined, recognized evenly over the term of the lease, and presented as a reduction to operating income. ASU 2016-02 requires that assets and liabilities be presented or disclosed separately, and requires additional disclosure of certain qualitative and quantitative information related to these lease agreements. ASU 2016-02 is effective for annual and interim periods beginning after December 15, 2018. The Company is currently assessing the impact of the adoption of ASU 2016-02 on the Company’s consolidated financial statements.

In March 2016, the FASB issued ASU 2016-05, "Derivatives and Hedging (Topic 815): Effect of Derivative Contract Novations on Existing Hedge Accounting Relationships." ASU 2016-05 clarifies that a change in the counterparty to a derivative instrument that has been designated as a hedging instrument does not, in and of itself, require re-designation of that hedging relationship provided that all other hedge accounting criteria continue to be met. The Company adopted this guidance on January 1, 2017. The adoption of ASU 2016-05 did not have a material impact on the Company's consolidated financial statements.

In March 2016, the FASB issued ASU 2016-09, “Stock Compensation (Topic 718): Improvements to Employee Share-Based Payment Accounting.” ASU 2016-09 simplifies several aspects of the accounting for employee share-based payment transactions, including the income tax consequences, classification of awards as either equity or liabilities, and classification on the statement of cash flows. This ASU is effective for fiscal years beginning after December 15, 2016, including interim periods within those fiscal years. The Company adopted this guidance prospectively on January 1, 2017, and prior periods have not

been adjusted. As a result of the adoption of this guidance, the Company no longer presents the tax effects from vesting of restricted stock grants and stock option exercises on its condensed consolidated statement of noncontrolling interests and equity.

In August 2016, the FASB issued ASU 2016-15, "Statement of Cash Flows (Topic 230): Classification of Certain Cash Receipts and Cash Payments." ASU 2016-15 provides guidance on several specific cash flow issues, including the classification of debt prepayment or debt extinguishment costs, contingent consideration payments, and distributions received from equity method investees. This guidance is effective for fiscal years beginning after December 15, 2017. The Company is currently evaluating the new guidance to determine the impact it may have on its consolidated financial statements.

In October 2016, the FASB issued ASU 2016-18, "Statement of Cash Flows (Topic 230): Restricted Cash," which requires that a statement of cash flows explains the change during the period in the total of cash, cash equivalents, and amounts generally described as restricted cash or restricted cash equivalents. Therefore, amounts generally described as restricted cash and restricted cash equivalents should be included with cash and cash equivalents when reconciling the beginning-of-period and end-of-period total amounts shown on the statement of cash flows. This guidance is effective for fiscal years beginning after December 15, 2017, and interim periods within those fiscal years. Early adoption is permitted. The Company is currently evaluating the new guidance to determine the impact it may have on its consolidated financial statements.

In January 2017, the FASB issued ASU 2017-01, "Business Combinations (Topic 805): Clarifying the Definition of a Business," which provides guidance on whether transactions should be accounted for as acquisitions or disposals of assets or businesses. Specifically, when substantially all of the fair value of the gross assets acquired (or disposed of) is concentrated in a single identifiable asset or group of similar identifiable assets, the set of assets is not a business. Additionally, ASU 2017-01 also provides other guidance providing a more robust framework to use in determining whether a set of assets and activities is a

business. This guidance is effective for annual periods beginning after December 15, 2017. Early adoption is permitted for transactions for which the acquisition or disposition date occurs before the issuance date or effective date of the amendments, only when the transaction has not been reported in financial statements that have been issued. The Company adopted ASU 2017-01 for new acquisitions beginning on January 1, 2017. The costs related to the acquisitions of stores that qualify as asset acquisitions will be capitalized as part of the purchase.

In August 2017, the FASB issued ASU 2017-12, "Derivatives and Hedging (Topic 815): Targeted Improvements for Accounting for Hedging Activities," which amends and simplifies existing guidance for the financial reporting of hedging relationships to

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EXTRA SPACE STORAGE INC.

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS (unaudited) (continued)

Amounts in thousands, except store and share data, unless otherwise stated

allow companies to better portray the economic effects of risk management activities in their financial statements. ASU 2017-12 is effective for annual periods beginning after December 15, 2018, with early adoption permitted. The Company is currently evaluating the new guidance to determine the impact it may have on its consolidated financial statements.

3. FAIR VALUE DISCLOSURES

Derivative Financial Instruments

Currently, the Company uses interest rate swaps to manage its interest rate risk. The valuation of these instruments is determined using widely accepted valuation techniques, including discounted cash flow analysis on the expected cash flows of each derivative. This analysis reflects the contractual terms of the derivatives, including the period to maturity, and uses observable market-based inputs, including interest rate curves. The fair values of interest rate swaps are determined using the market standard methodology of netting the discounted future fixed cash payments and the discounted expected variable cash receipts. The variable cash receipts are based on an expectation of future interest rates (forward curves) derived from observable market interest rate forward curves.

The Company incorporates credit valuation adjustments to appropriately reflect both its own nonperformance risk and the respective counterparty’s nonperformance risk in the fair value measurements. In adjusting the fair value of its derivative contracts for the effect of nonperformance risk, the Company has considered the impact of netting and any applicable credit enhancements, such as collateral postings, thresholds, mutual puts and guarantees. In conjunction with the FASB’s fair value measurement guidance, the Company made an accounting policy election to measure the credit risk of its derivative financial instruments that are subject to master netting agreements on a net basis by counterparty portfolio.

Although the Company has determined that the majority of the inputs used to value its derivatives fall within Level 2 of the fair value hierarchy, the credit valuation adjustments associated with its derivatives utilize Level 3 inputs, such as estimates of current credit spreads to evaluate the likelihood of default by the Company and its counterparties. However, as of September 30, 2017, the Company had assessed the significance of the impact of the credit valuation adjustments on the overall valuation of its derivative positions and determined that the credit valuation adjustments were not significant to the overall valuation of its derivatives. As a result, the Company determined that its derivative valuations in their entirety were classified in Level 2 of the fair value hierarchy.

The table below presents the Company’s assets and liabilities measured at fair value on a recurring basis as of September 30, 2017, aggregated by the level in the fair value hierarchy within which those measurements fall. 

				Fair Value Measurements at Reporting Date Using
Description	September 30, 2017			Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)			Significant Unobservable Inputs (Level 3)
Other assets - Cash Flow Hedge Swap Agreements	$	23,584		$	—	$	23,584		$	—
Other liabilities - Cash Flow Hedge Swap Agreements	$	(1,430	)	$	—	$	(1,430	)	$	—

The Company did not have any significant assets or liabilities that are re-measured on a recurring basis using significant unobservable inputs as of September 30, 2017 or December 31, 2016.

Assets and Liabilities Measured at Fair Value on a Nonrecurring Basis

Long-lived assets held for use are evaluated for impairment when events or circumstances indicate there may be impairment. The Company reviews each store at least annually to determine if any such events or circumstances have occurred or exist. The Company focuses on stores where occupancy and/or rental income have decreased by a significant amount. For these stores, the Company determines whether the decrease is temporary or permanent, and whether the store will likely recover the lost occupancy and/or revenue in the short term. In addition, the Company carefully reviews stores in the lease-up stage and compares actual operating results to original projections.

When the Company determines that an event that may indicate impairment has occurred, the Company compares the carrying value of the related long-lived assets to the undiscounted future net operating cash flows attributable to the assets. An

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NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS (unaudited) (continued)

Amounts in thousands, except store and share data, unless otherwise stated

impairment loss is recorded if the net carrying value of the assets exceeds the undiscounted future net operating cash flows attributable to the assets. The impairment loss recognized equals the excess of net carrying value over the related fair value of the assets.

When real estate assets are identified by management as held for sale, the Company discontinues depreciating the assets and estimates the fair value of the assets, net of selling costs. If the estimated fair value, net of selling costs, of the assets that have been identified as held for sale is less than the net carrying value of the assets, the Company would recognize an impairment loss on the assets held for sale. The operations of assets held for sale or sold during the period are presented as part of normal operations for all periods presented. As of September 30, 2017, the Company had one parcel of undeveloped land and 36 operating stores classified as held for sale. The estimated fair value less selling costs of each of these operating stores is greater than the carrying value of the assets, and therefore no loss has been recorded related to the operating stores held for sale. For the nine months ended September 30, 2017, the Company recorded an impairment loss of $6,100 relating to one parcel of land held for sale and an additional two parcels of undeveloped land where the carrying value was greater than the fair value.

The Company assesses whether there are any indicators that the value of the Company’s investments in unconsolidated real estate ventures may be impaired annually and when events or circumstances indicate that there may be impairment. An investment is impaired if management’s estimate of the fair value of the investment is less than its carrying value. To the extent impairment has occurred, and is considered to be other than temporary, the loss is measured as the excess of the carrying amount of the investment over the fair value of the investment.

In connection with the Company’s acquisition of stores, the purchase price is allocated to the tangible and intangible assets and liabilities acquired based on their relative fair values, which are estimated using significant unobservable inputs. The value of the tangible assets, consisting of land and buildings, is determined as if vacant. Intangible assets, which represent the value of existing tenant relationships, are recorded at their fair values based on the avoided cost to replace the current leases. The Company measures the value of tenant relationships based on the rent lost due to the amount of time required to replace existing customers, which is based on the Company’s historical experience with turnover in its stores. Debt assumed as part of an acquisition is recorded at fair value based on current interest rates compared to contractual rates. Acquisition-related transaction costs, for those qualifying as asset acquisitions, are capitalized as a component of the cost of the assets acquired.

Fair Value of Financial Instruments

The carrying values of cash and cash equivalents, restricted cash, receivables, other financial instruments included in other assets, accounts payable and accrued expenses, variable-rate notes payable, lines of credit and other liabilities reflected in the condensed consolidated balance sheets at September 30, 2017 and December 31, 2016 approximate fair value.

The fair values of the Company’s notes receivable from Preferred Operating Partnership unit holders and other fixed rate notes receivable were based on the discounted estimated future cash flows of the notes (categorized within Level 3 of the fair value hierarchy); the discount rate used approximated the current market rate for loans with similar maturities and credit quality. The fair values of the Company’s fixed-rate notes payable and notes payable to trusts were estimated using the discounted estimated future cash payments to be made on such debt (categorized within Level 3 of the fair value hierarchy); the discount rates used approximated current market rates for loans, or groups of loans, with similar maturities and credit quality. The fair value of the Company’s exchangeable senior notes was estimated using an average market price for similar securities obtained from a third party.

The fair values of the Company’s fixed-rate assets and liabilities were as follows for the periods indicated:

	September 30, 2017				December 31, 2016
	Fair Value		Carrying Value		Fair Value		Carrying Value
Notes receivable from Preferred Operating Partnership unit holders	$	114,506	$	120,230	$	125,642	$	120,230
Fixed rate notes receivable	$	21,285	$	20,608	$	53,450	$	52,201
Fixed rate notes payable and notes payable to trusts	$	2,882,709	$	2,900,822	$	2,404,996	$	2,417,558
Exchangeable senior notes	$	702,118	$	624,384	$	706,827	$	638,170

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EXTRA SPACE STORAGE INC.

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS (unaudited) (continued)

Amounts in thousands, except store and share data, unless otherwise stated

4. EARNINGS PER COMMON SHARE

Basic earnings per common share is computed using the two-class method by dividing net income attributable to common stockholders by the weighted average number of common shares outstanding during the period. All outstanding unvested restricted stock awards contain rights to non-forfeitable dividends and participate in undistributed earnings with common stockholders; accordingly, they are considered participating securities that are included in the two-class method. Diluted earnings per common share measures the performance of the Company over the reporting period while giving effect to all potential common shares that were dilutive and outstanding during the period. The denominator includes the weighted average number of basic shares and the number of additional common shares that would have been outstanding if the potential common shares that were dilutive had been issued, and is calculated using either the two-class, treasury stock or as if-converted method, whichever is most dilutive. Potential common shares are securities (such as options, convertible debt, Series A Participating Redeemable Preferred Units (“Series A Units”), Series B Redeemable Preferred Units (“Series B Units”), Series C Convertible Redeemable Preferred Units (“Series C Units”), Series D Redeemable Preferred Units (“Series D Units”) and common Operating Partnership units (“OP Units”)) that do not have a current right to participate in earnings of the Company but could do so in the future by virtue of their option, redemption or conversion right.

In computing the dilutive effect of convertible securities, net income is adjusted to add back any changes in earnings in the period associated with the convertible security. The numerator also is adjusted for the effects of any other non-discretionary changes in income or loss that would result from the assumed conversion of those potential common shares. In computing diluted earnings per common share, only potential common shares that are dilutive (those that reduce earnings per common share) are included. For the three months ended September 30, 2017 and 2016, options to purchase approximately 45,438 and 95,031 shares of common stock, respectively, and for the nine months ended September 30, 2017 and 2016, options to purchase approximately 97,697 and 84,919 shares of common stock, respectively, were excluded from the computation of earnings per share as their effect would have been anti-dilutive.

For the purposes of computing the diluted impact of the potential exchange of the Preferred Operating Partnership units for common shares upon redemption, where the Company has the option to redeem in cash or shares and where the Company has stated the intent and ability to settle the redemption in shares, the Company divided the total value of the Preferred Operating Partnership units by the average share price for the period presented. The average share price for the three months ended September 30, 2017 and 2016 was $77.84 and $84.41, respectively, and for the nine months ended September 30, 2017 and 2016, the average share price was $76.67 and $87.22, respectively. The following table presents the number of Preferred Operating Partnership units, and the potential common shares, that were excluded from the computation of earnings per share as their effect would have been anti-dilutive.

	For the Three Months Ended September 30,		For the Nine Months Ended September 30,
	2017	2016	2017	2016
	Equivalent Shares (if converted)	Equivalent Shares (if converted)	Equivalent Shares (if converted)	Equivalent Shares (if converted)
Series B Units	538,312	496,412	546,526	480,419
Series C Units	380,769	351,132	386,580	339,820
Series D Units	1,126,831	—	1,091,319	417,420
	2,045,912	847,544	2,024,425	1,237,659

The Operating Partnership had $49,384 of its 2.375% Exchangeable Senior Notes due 2033 (the “2013 Notes”) issued and outstanding as of September 30, 2017. The 2013 Notes could potentially have a dilutive impact on the Company’s earnings per share calculations. The 2013 Notes are exchangeable by holders into shares of the Company’s common stock under certain circumstances per the terms of the indenture governing the 2013 Notes. The exchange price of the 2013 Notes was $53.28 per share as of September 30, 2017, and could change over time as described in the indenture. The Company has irrevocably agreed to pay only cash for the accreted principal amount of the 2013 Notes relative to its exchange obligations, but retained the right to satisfy the exchange obligation in excess of the accreted principal amount in cash and/or common stock.

The Operating Partnership had $575,000 of its 3.125% Exchangeable Senior Notes due 2035 (the “2015 Notes”) issued and outstanding as of September 30, 2017. The 2015 Notes could potentially have a dilutive impact on the Company’s earnings per share calculations. The 2015 Notes are exchangeable by holders into shares of the Company’s common stock under certain circumstances per the terms of the indenture governing the 2015 Notes. The exchange price of the 2015 Notes was $94.01 per

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EXTRA SPACE STORAGE INC.

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS (unaudited) (continued)

Amounts in thousands, except store and share data, unless otherwise stated

share as of September 30, 2017, and could change over time as described in the indenture. The Company has irrevocably agreed to pay only cash for the accreted principal amount of the 2015 Notes relative to its exchange obligations, but retained the right to satisfy the exchange obligation in excess of the accreted principal amount in cash and/or common stock.

Although the Company has retained the right to satisfy the exchange obligation in excess of the accreted principal amount of the 2013 Notes and 2015 Notes in cash and/or common stock, Accounting Standards Codification (“ASC”) 260, “Earnings per Share,” requires an assumption that shares would be used to pay such exchange obligation, and requires that those shares be included in the Company’s calculation of weighted average common shares outstanding for the diluted earnings per share computation. For the three and nine months ended September 30, 2017 and 2016, 292,439 and 413,498 shares, respectively, related to the 2013 Notes were included in the computation for diluted earnings per share. For the three and nine months ended September 30, 2017 and 2016, no shares related to the 2015 Notes were included in the computation for diluted earnings per share as the exchange price exceeded the per share price of the Company’s common stock during these periods.

For the purposes of computing the diluted impact on earnings per share of the potential exchange of Series A Units for common shares upon redemption, where the Company has the option to redeem in cash or shares and where the Company has stated the positive intent and ability to settle at least $115,000 of the instrument in cash (or net settle a portion of the Series A Units against the related outstanding note receivable), only the amount of the instrument in excess of $115,000 is considered in the calculation of shares contingently issuable for the purposes of computing diluted earnings per share as allowed by ASC 260-10-45-46. Accordingly, the number of shares included in the computation for diluted earnings per share related to the Series A Units is equal to the number of Series A Units outstanding, with no additional shares included related to the fixed $115,000 amount.

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EXTRA SPACE STORAGE INC.

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS (unaudited) (continued)

Amounts in thousands, except store and share data, unless otherwise stated

The computation of earnings per common share was as follows for the periods presented:

	For the Three Months Ended September 30,						For the Nine Months Ended September 30,
	2017			2016			2017			2016
Net income attributable to common stockholders	$	93,764		$	118,088		$	263,052		$	283,724
Earnings and dividends allocated to participating securities	(191		)	(248		)	(595		)	(616		)
Earnings for basic computations	93,573			117,840			262,457			283,108
Earnings and dividends allocated to participating securities	191			—			595			—
Income allocated to noncontrolling interest - Preferred Operating Partnership (Series A Units) and Operating Partnership	5,163			7,776			15,448			17,926
Fixed component of income allocated to noncontrolling interest - Preferred Operating Partnership (Series A Units)	(572		)	(1,271		)	(2,547		)	(3,814		)
Net income for diluted computations	$	98,355		$	124,345		$	275,953		$	297,220
Weighted average common shares outstanding:
Average number of common shares outstanding - basic	125,717,517			125,752,291			125,665,787			125,244,761
OP Units	5,590,231			5,534,350			5,586,908			5,557,723
Series A Units	875,480			875,480			875,480			875,480
Series D Units	—			814,435			—			—
Unvested restricted stock awards included for treasury stock method	280,484			—			288,831			—
Shares related to exchangeable senior notes and dilutive stock options	580,761			786,916			591,616			798,727
Average number of common shares outstanding - diluted	133,044,473			133,763,472			133,008,622			132,476,691
Earnings per common share
Basic	$	0.74		$	0.94		$	2.09		$	2.26
Diluted	$	0.74		$	0.93		$	2.07		$	2.24

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EXTRA SPACE STORAGE INC.

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS (unaudited) (continued)

Amounts in thousands, except store and share data, unless otherwise stated

5. STORE ACQUISITIONS AND DISPOSITIONS

The following table shows the Company’s acquisitions of operating stores for the nine months ended September 30, 2017. The table excludes purchases of raw land or improvements made to existing assets.

					Consideration Paid												Total
Property Location	Number of Stores	Date of Acquisition	Total		Cash Paid		Loan Assumed		Non- controlling interests		Net Liabilities/(Assets) Assumed			Value of OP Units Issued		Number of OP Units Issued	Real estate assets
Georgia	1	9/1/2017	$	4,246	$	4,220	$	—	$	—	$	26		$	—	—	$	4,246
Florida	1	8/4/2017	9,047		7,058		—		—		(11		)	2,000		25,520	9,047
North Carolina	1	7/13/2017	8,422		8,426		—		—		(4		)	—		—	8,422
Virginia	1	7/13/2017	10,251		10,215		—		—		36			—		—	10,251
Florida	1	6/12/2017	11,100		4,270		—		—		20			6,810		272,400	11,100
Florida	1	4/25/2017	7,377		7,400		—		—		(23		)	—		—	7,377
Pennsylvania	1	4/11/2017	16,164		4,938		9,463		1,827		(64		)	—		—	16,164
Illinois	1	2/1/2017	9,028		9,020		—		—		8			—		—	9,028
Georgia	1	1/6/2017	16,528		16,521		—		—		7			—		—	16,528
2017 Totals	9		$	92,163	$	72,068	$	9,463	$	1,827	$	(5	)	$	8,810	297,920	$	92,163

Store Dispositions

On September 13, 2017, the Company closed on the sale of a parcel of land located in New York that had been classified as held for sale for $19,000 in cash. This parcel of land had been written down to its fair value less selling costs during the six months ended June 30, 2017, and therefore no additional gain or loss was recorded related to this sale at the time of closing.

On July 26, 2016, the Company closed on the sale of one operating store located in Indiana that had been classified as held for sale for $4,447 in cash. The Company recognized no gain or loss related to this disposition.

On April 20, 2016, the Company closed on the sale of seven operating stores located in Ohio and Indiana that had been classified as held for sale for $17,555 in cash. The Company recognized a gain of $11,265 related to this disposition.

On April 1, 2016, the Company disposed of a single store in Texas in exchange for 85,452 of our OP Units valued at $7,689. The Operating Partnership has canceled the OP Units received in this disposition. The Company recognized a gain of $93 related to this disposition.

Losses on Earnout from Prior Acquisition

In December 2014, the Company acquired a portfolio of five stores located in New Jersey and Virginia. As part of this acquisition, the Company agreed to make an additional cash payment to the sellers if the acquired stores exceeded a specified amount of net operating income for the years ending December 31, 2015 and 2016. At the acquisition date, the Company recorded an estimated liability related to this earnout provision. The operating income of these stores during the earnout period was higher than expected, resulting in an increase in the estimate of the amount due to the sellers of $1,544, which was recorded as a loss and included in gain (loss) on real estate transactions, earnout from prior acquisition and impairment of real estate in the Company’s condensed consolidated statements of operations for the nine months ended September 30, 2016.

6. VARIABLE INTERESTS

The Operating Partnership has three wholly-owned unconsolidated subsidiaries (“Trust,” “Trust II” and “Trust III,” together, the “Trusts”) that have issued trust preferred securities to third parties and common securities to the Operating Partnership. The proceeds from the sale of the preferred and common securities were loaned in the form of notes to the Operating Partnership. The Trusts are VIEs because the holders of the equity investment at risk (the trust preferred securities) do not have the power to direct the activities of the entities that most significantly affect the entities’ economic performance because of their lack of voting or similar rights. Because the Operating Partnership’s investment in the Trusts’ common securities was financed directly

18

EXTRA SPACE STORAGE INC.

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS (unaudited) (continued)

Amounts in thousands, except store and share data, unless otherwise stated

by the Trusts as a result of its loan of the proceeds to the Operating Partnership, that investment is not considered an equity investment at risk. The Operating Partnership’s investment in the Trusts is not a variable interest because equity interests are variable interests only to the extent that the investment is considered to be at risk, and therefore the Operating Partnership cannot be the primary beneficiary of the Trusts. Since the Company is not the primary beneficiary of the Trusts, they have not been consolidated. A debt obligation has been recorded in the form of notes for the proceeds as discussed above, which are owed to the Trusts. The Company has also included its investment in the Trusts’ common securities in other assets on the condensed consolidated balance sheets.

The Company has not provided financing or other support during the periods presented to the Trusts that it was not previously contractually obligated to provide. The Company’s maximum exposure to loss as a result of its involvement with the Trusts is equal to the total amount of the notes discussed above less the amounts of the Company’s investments in the Trusts’ common securities. The net amount is equal to the notes payable that the Trusts owe to third parties for their investments in the Trusts’ preferred securities.

Following is a tabular comparison of the assets and liabilities the Company has recorded as a result of its involvement with the Trusts to the maximum exposure to loss the Company is subject to as a result of such involvement as of September 30, 2017:

	Notes payable to Trusts			Investment Balance		Maximum exposure to loss		Difference
Trust	$	36,083		$	1,083	$	35,000	$	—
Trust II	42,269			1,269		41,000		—
Trust III	41,238			1,238		40,000		—
	119,590			$	3,590	$	116,000	—
Unamortized debt issuance costs	(2,176		)
	$	117,414

The Company had no consolidated VIEs during the nine months ended September 30, 2017.

7. DERIVATIVES

The Company is exposed to certain risks arising from both its business operations and economic conditions. The Company principally manages its exposures to a wide variety of business and operational risks through management of its core business activities. The Company manages economic risks, including interest rate, liquidity and credit risk, primarily by managing the amount, sources and duration of its debt funding and by using derivative financial instruments. Specifically, the Company enters into derivative financial instruments to manage exposure that arises from business activities that result in the receipt or payment of future known and uncertain cash amounts, the value of which are determined by interest rates. The Company’s derivative financial instruments are used to manage differences in the amount, timing and duration of the Company’s known or expected cash receipts and its known or expected cash payments principally related to the Company’s investments and borrowings.

Cash Flow Hedges of Interest Rate Risk

The Company’s objectives in using interest rate derivatives are to add stability to interest expense and to manage its exposure to interest rate movements. To accomplish these objectives, the Company primarily uses interest rate swaps as part of its interest rate risk management strategy. Interest rate swaps designated as cash flow hedges involve the receipt of variable amounts from a counterparty in exchange for the Company making fixed-rate payments over the life of the agreements without exchange of the underlying notional amount.

The effective portion of changes in the fair value of derivatives designated and that qualify as cash flow hedges is recorded in accumulated other comprehensive income (“OCI”) and is subsequently reclassified into earnings in the period that the hedged forecasted transaction affects earnings. A portion of these changes is excluded from accumulated other comprehensive income as it is allocated to noncontrolling interests. During the three and nine months ended September 30, 2017 and 2016, such derivatives were used to hedge the variable cash flows associated with existing variable-rate debt. In the coming 12 months, the Company estimates that an additional $1,513 will be reclassified as an increase to interest expense.

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EXTRA SPACE STORAGE INC.

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS (unaudited) (continued)

Amounts in thousands, except store and share data, unless otherwise stated

The Company held 30 derivative financial instruments which had a total combined notional amount of $2,255,018 as of September 30, 2017.

Fair Values of Derivative Instruments

The table below presents the fair value of the Company’s derivative financial instruments as well as their classification on the condensed consolidated balance sheets:

	Asset (Liability) Derivatives
	September 30, 2017			December 31, 2016
Derivatives designated as hedging instruments:	Fair Value
Other assets	$	23,584		$	23,844
Other liabilities	$	(1,430	)	$	(2,447	)

Effect of Derivative Instruments

The tables below present the effect of the Company’s derivative financial instruments on the condensed consolidated statements of operations for the periods presented. No tax effect has been presented as the derivative instruments are held by the Company:

	Gain (loss) recognized in OCI For the Three Months Ended September 30,					Location of amounts reclassified from OCI into income	Gain (loss) reclassified from OCI For the Three Months Ended September 30,
Type	2017			2016			2017			2016
Swap Agreements	$	(787	)	$	8,451	Interest expense	$	(1,572	)	$	(4,926	)

	Gain (loss) recognized in OCI For the Nine Months Ended September 30,						Location of amounts reclassified from OCI into income	Gain (loss) reclassified from OCI For the Nine Months Ended September 30,
Type	2017			2016				2017			2016
Swap Agreements	$	(6,474	)	$	(50,165	)	Interest expense	$	(7,497	)	$	(14,240	)

Credit-risk-related Contingent Features

The Company has agreements with some of its derivative counterparties that contain provisions pursuant to which the Company could be declared in default of its derivative obligations if the Company defaults on any of its indebtedness, including default where repayment of the indebtedness has not been accelerated by the lender.

The Company also has an agreement with some of its derivative counterparties that incorporates the loan covenant provisions of the Company’s indebtedness with a lender affiliate of the derivative counterparty. Failure to comply with the loan covenant provisions would result in the Company being in default on any derivative instrument obligations covered by the agreement.

As of September 30, 2017, the fair value of derivatives in a net liability position, which includes accrued interest but excludes any adjustment for nonperformance risk, related to these agreements was $1,257. As of September 30, 2017, the Company had not posted any collateral related to these agreements. If the Company had breached any of these provisions as of September 30, 2017, it could have been required to settle its obligations under the agreements at their termination value of $1,620, including accrued interest.

20

EXTRA SPACE STORAGE INC.

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS (unaudited) (continued)

Amounts in thousands, except store and share data, unless otherwise stated

8. EXCHANGEABLE SENIOR NOTES

In September 2015, the Operating Partnership issued $575,000 of its 3.125% Exchangeable Senior Notes due 2035. Costs incurred to issue the 2015 Notes were approximately $11,992, consisting primarily of a 2.0% underwriting fee. These costs are being amortized as an adjustment to interest expense over five years, which represents the estimated term based on the first available redemption date, and are included in exchangeable senior notes, net, in the condensed consolidated balance sheets. The 2015 Notes are general unsecured senior obligations of the Operating Partnership and are fully guaranteed by the Company. Interest is payable on April 1 and October 1 of each year beginning April 1, 2016, until the maturity date of October 1, 2035. The 2015 Notes bear interest at 3.125% per annum and contain an exchange settlement feature, which provides that the 2015 Notes may, under certain circumstances, be exchangeable for cash (for the principal amount of the 2015 Notes) and, with respect to any excess exchange value, for cash, shares of the Company’s common stock, or a combination of cash and shares of the Company’s common stock, at the Company’s option. The exchange rate of the 2015 Notes as of September 30, 2017 was approximately 10.64 shares of the Company’s common stock per $1,000 principal amount of the 2015 Notes.

The Operating Partnership may redeem the 2015 Notes at any time to preserve the Company’s status as a REIT. In addition, on or after October 5, 2020, the Operating Partnership may redeem the 2015 Notes for cash, in whole or in part, at 100% of the principal amount plus accrued and unpaid interest, upon at least 30 days but not more than 60 days prior written notice to the holders of the 2015 Notes. The holders of the 2015 Notes have the right to require the Operating Partnership to repurchase the 2015 Notes for cash, in whole or in part, on October 1 of the years 2020, 2025 and 2030 (unless the Operating Partnership has called the 2015 Notes for redemption), and upon the occurrence of certain designated events, in each case for a repurchase price equal to 100% of the principal amount of the 2015 Notes plus accrued and unpaid interest. Certain events are considered “Events of Default,” as defined in the indenture governing the 2015 Notes, which may result in the accelerated maturity of the 2015 Notes.

On June 21, 2013, the Operating Partnership issued $250,000 of its 2.375% Exchangeable Senior Notes due 2033 at a 1.5% discount, or $3,750. Costs incurred to issue the 2013 Notes were approximately $1,672. These costs are being amortized as an adjustment to interest expense over five years, which represents the estimated term based on the first available redemption date, and are included in exchangeable senior notes, net, in the condensed consolidated balance sheets. The 2013 Notes are general unsecured senior obligations of the Operating Partnership and are fully guaranteed by the Company. Interest is payable on January 1 and July 1 of each year beginning January 1, 2014, until the maturity date of July 1, 2033. The 2013 Notes bear interest at 2.375% per annum and contain an exchange settlement feature, which provides that the 2013 Notes may, under certain circumstances, be exchangeable for cash (for the principal amount of the 2013 Notes) and, with respect to any excess exchange value, for cash, shares of the Company’s common stock, or a combination of cash and shares of the Company’s common stock, at the Company’s option. The exchange rate of the 2013 Notes as of September 30, 2017 was approximately 18.77 shares of the Company’s common stock per $1,000 principal amount of the 2013 Notes.

The Operating Partnership may redeem the 2013 Notes at any time to preserve the Company’s status as a REIT. In addition, on or after July 5, 2018, the Operating Partnership may redeem the 2013 Notes for cash, in whole or in part, at 100% of the principal amount plus accrued and unpaid interest, upon at least 30 days but not more than 60 days prior written notice to the holders of the 2013 Notes. The holders of the 2013 Notes have the right to require the Operating Partnership to repurchase the 2013 Notes for cash, in whole or in part, on July 1 of the years 2018, 2023 and 2028, and upon the occurrence of certain designated events, in each case for a repurchase price equal to 100% of the principal amount of the 2013 Notes plus accrued and unpaid interest. Certain events are considered “Events of Default,” as defined in the indenture governing the 2013 Notes, which may result in the accelerated maturity of the 2013 Notes.

Additionally, the 2013 Notes and the 2015 Notes can be exchanged during any calendar quarter, if the last reported sale price of the common stock of the Company is greater than or equal to 130% of the exchange price for at least 20 trading days during a period of 30 consecutive trading days ending on the last trading day of the immediately preceding calendar quarter. The price of the Company’s common stock exceeded 130% of the exchange price for the required time period for the 2013 Notes during the quarter ended September 30, 2017. Therefore, holders of the 2013 Notes may elect to exchange such notes during the quarter ending December 31, 2017. The price of the Company’s common stock did not exceed 130% of the exchange price for the required time period for the 2015 Notes during the quarter ended September 30, 2017.

GAAP requires entities with convertible debt instruments that may be settled entirely or partially in cash upon conversion to separately account for the liability and equity components of the instrument in a manner that reflects the issuer’s economic

21

EXTRA SPACE STORAGE INC.

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS (unaudited) (continued)

Amounts in thousands, except store and share data, unless otherwise stated

interest cost. The Company therefore accounts for the liability and equity components of the 2013 Notes and 2015 Notes separately. The equity components are included in paid-in capital in stockholders’ equity in the condensed consolidated balance sheets, and the value of the equity components are treated as original issue discount for purposes of accounting for the debt components. The discounts are being amortized as interest expense over the remaining period of the debt through its first redemption date: July 1, 2018 for the 2013 Notes, and October 1, 2020 for the 2015 Notes. The effective interest rate on the liability components of both the 2013 Notes and the 2015 Notes is 4.0%, which approximated the market rate of interest of similar debt without exchange features (i.e. nonconvertible debt) at the time of issuance.

Information about the Company’s 2013 Notes and 2015 Notes, including the total carrying amounts of the equity components, the principal amounts of the liability components, the unamortized discounts and the net carrying amounts was as follows for the periods indicated:

	September 30, 2017			December 31, 2016
Carrying amount of equity component - 2013 Notes	$	—		$	—
Carrying amount of equity component - 2015 Notes	22,597			22,597
Carrying amount of equity components	$	22,597		$	22,597
Principal amount of liability component - 2013 Notes	$	49,384		$	63,170
Principal amount of liability component - 2015 Notes	575,000			575,000
Unamortized discount - equity component - 2013 Notes	(475		)	(1,187		)
Unamortized discount - equity component - 2015 Notes	(14,091		)	(17,355		)
Unamortized cash discount - 2013 Notes	(110		)	(281		)
Unamortized debt issuance costs	(7,223		)	(9,033		)
Net carrying amount of liability components	$	602,485		$	610,314

The amount of interest cost recognized relating to the contractual interest rates and the amortization of the discounts on the liability components of the Notes were as follows for the periods indicated:

	For the Three Months Ended September 30,				For the Nine Months Ended September 30,
	2017		2016		2017		2016
Contractual interest	$	4,785	$	4,867	$	14,519	$	14,616
Amortization of discount	1,268		1,243		3,827		3,716
Total interest expense recognized	$	6,053	$	6,110	$	18,346	$	18,332

Repurchases of 2013 Notes

During July and August 2017, the Company repurchased a total principal amount of $13,786 of the 2013 Notes. The Company paid cash of $19,853 for the total of the principal amount and the exchange value in excess of the principal amount.

The Company allocated the value of the consideration paid to repurchase the 2013 Notes (1) to the extinguishment of the liability component and (2) to the reacquisition of the equity component. The amount allocated to the extinguishment of the liability component is equal to the fair value of that component immediately prior to extinguishment. The difference between the consideration attributed to the extinguishment of the liability component and the sum of (a) the net carrying amount of the repurchased liability component, and (b) the related unamortized debt issuance costs, is recognized as a gain on debt extinguishment. The remaining settlement consideration is allocated to the reacquisition of the equity component of the repurchased 2013 Notes and recognized as a reduction of stockholders’ equity.

22

EXTRA SPACE STORAGE INC.

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS (unaudited) (continued)

Amounts in thousands, except store and share data, unless otherwise stated

Information about the repurchases is as follows:

	July/August 2017
Principal amount repurchased	$	13,786
Amount allocated to:
Extinguishment of liability component	$	13,568
Reacquisition of equity component	6,285
Total consideration paid for repurchase	$	19,853
Exchangeable senior notes repurchased	$	13,786
Extinguishment of liability component	(13,568		)
Discount on exchangeable senior notes	(183		)
Related debt issuance costs	(35		)
Gain/(loss) on repurchase	$	—

9. STOCKHOLDERS’ EQUITY

On May 6, 2016, the Company filed its current $400,000 "at the market" equity program with the Securities and Exchange Commission using a new shelf registration statement on Form S-3, and entered into separate equity distribution agreements with five sales agents. Under the terms of the current equity distribution agreements, the Company may from time to time offer and sell shares of common stock, up to the aggregate offering price of $400,000, through its sales agents.

During the three and nine months ended September 30, 2017, the Company did not issue any shares and had $349,375 available for issuance under the existing equity distribution agreements.

10. NONCONTROLLING INTEREST REPRESENTED BY PREFERRED OPERATING PARTNERSHIP UNITS

Classification of Noncontrolling Interests

GAAP requires a company to present ownership interests in subsidiaries held by parties other than the company in the consolidated financial statements within the equity section, but separate from the company’s equity. It also requires the amount of consolidated net income attributable to the parent and to the noncontrolling interest to be clearly identified and presented on the face of the consolidated statement of operations and requires changes in ownership interest to be accounted for similarly as equity transactions. If noncontrolling interests are determined to be redeemable, they are to be carried at their redemption value as of the balance sheet date and reported as temporary equity.

The Company has evaluated the terms of the Operating Partnership’s preferred units and classifies the noncontrolling interest represented by such preferred units as stockholders’ equity in the accompanying condensed consolidated balance sheets. The Company will periodically evaluate individual noncontrolling interests for the ability to continue to recognize the noncontrolling interest as permanent equity in the condensed consolidated balance sheets. Any noncontrolling interests that fail to qualify as permanent equity will be reclassified as temporary equity and adjusted to the greater of (1) the carrying amount and (2) the redemption value as of the end of the period in which the determination is made.

Series A Participating Redeemable Preferred Units

On June 15, 2007, the Operating Partnership entered into a Contribution Agreement with various limited partnerships affiliated with AAAAA Rent-A-Space to acquire ten stores in exchange for 989,980 Series A Units of the Operating Partnership. The stores are located in California and Hawaii.

The partnership agreement of the Operating Partnership (as amended, the “Partnership Agreement”) provides for the designation and issuance of the Series A Units. The Series A Units will have priority over all other partnership interests of the Operating Partnership with respect to distributions and liquidation.

Under the Partnership Agreement, Series A Units in the amount of $115,000 bear a fixed priority return of 2.3% and have a fixed liquidation value of $115,000. The remaining balance participates in distributions with, and has a liquidation value equal

23

EXTRA SPACE STORAGE INC.

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS (unaudited) (continued)

Amounts in thousands, except store and share data, unless otherwise stated

to, that of the OP Units. The Series A Units are redeemable at the option of the holder, which redemption obligation may be satisfied, at the Company’s option, in cash or shares of its common stock. On April 18, 2017, the holders of the Series A Units and the Operating Partnership agreed to reduce the fixed priority return on the Series A Units from 5.0% to 2.3% in exchange for a reduction in the interest rate of the related loan, as more fully described below.

On June 25, 2007, the Operating Partnership loaned the holders of the Series A Units $100,000. The note receivable bears interest at 2.1%. On April 18, 2017, a loan amendment was signed modifying the maturity date of the loan to the later of the death of the Series A Unit holder or his spouse. The loan amendment also lowered the interest rate of the loan from 4.9% to 2.1%. The loan amendment was determined to be a loan modification under GAAP, and therefore no change in value was recognized. The loan is secured by the borrower’s Series A Units. The holders of the Series A Units could redeem up to 114,500 Series A Units prior to the maturity date of the loan. If any redemption in excess of 114,500 Series A Units occurs prior to the maturity date, the holder of the Series A Units is required to repay the loan as of the date of that redemption. On October 3, 2014, the holders of the Series A Units redeemed 114,500 Series A Units for $4,794 in cash and 280,331 shares of common stock. No additional redemption of Series A Units can be made without repayment of the loan. The Series A Units are shown on the balance sheet net of the $100,000 loan because the borrower under the loan receivable is also the holder of the Series A Units.

Series B Redeemable Preferred Units

On April 3, 2014, the Operating Partnership completed the purchase of a store located in Georgia. This store was acquired in exchange for $15,158 of cash and 333,360 Series B Units valued at $8,334.

On August 29, 2013, the Operating Partnership completed the purchase of 19 out of 20 stores affiliated with All Aboard Mini Storage, all of which are located in California. On September 26, 2013, the Operating Partnership completed the purchase of the remaining store. These stores were acquired in exchange for $100,876 of cash (including $98,960 of debt assumed and immediately defeased at closing), 1,342,727 Series B Units valued at $33,568, and 1,448,108 OP Units valued at $62,341.

The Partnership Agreement provides for the designation and issuance of the Series B Units. The Series B Units rank junior to the Series A Units, on parity with the Series C Units and Series D Units, and senior to all other partnership interests of the Operating Partnership with respect to distributions and liquidation.

The outstanding Series B Units have a liquidation value of $25.00 per unit for a fixed liquidation value of $41,902. Holders of the Series B Units receive distributions at an annual rate of 6.0%. These distributions are cumulative. The Series B Units became redeemable at the option of the holder on the first anniversary of the date of issuance, which redemption obligation may be satisfied at the Company’s option in cash or shares of its common stock.

Series C Convertible Redeemable Preferred Units

The Company completed the purchase of twelve stores in California between December 2013 and May 2014. The Company previously held 35% interests in five of these stores and a 40% interest in one store through six separate joint ventures. These stores were acquired in exchange for a total of approximately $45,722 of cash, the assumption of $37,532 in existing debt, and the issuance of 704,016 Series C Units valued at $30,960.

The Partnership Agreement provides for the designation and issuance of the Series C Units. The Series C Units rank junior to the Series A Units, on parity with the Series B Units and Series D Units, and senior to all other partnership interests of the Operating Partnership with respect to distributions and liquidation.

The outstanding Series C Units have a liquidation value of $42.10 per unit for a fixed liquidation value of $29,639. From issuance to the fifth anniversary of issuance, each Series C Unit holder will receive quarterly distributions equal to the quarterly distribution per OP Unit plus $0.18. Beginning on the fifth anniversary of issuance, each Series C Unit holder will receive a fixed quarterly distribution equal to the aggregate quarterly distribution payable in respect of such Series C Unit during the four quarters immediately preceding the fifth anniversary of issuance, divided by four. These distributions are cumulative. The Series C Units became redeemable at the option of the holder one year from the date of issuance, which redemption obligation may be satisfied at the Company’s option in cash or shares of its common stock. The Series C Units are convertible into OP Units at the option of the holder at a rate of 0.9145 OP Units per Series C Unit converted. This conversion option expires upon the fifth anniversary of the date of issuance.

24

EXTRA SPACE STORAGE INC.

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS (unaudited) (continued)

Amounts in thousands, except store and share data, unless otherwise stated

In December 2014, the Operating Partnership loaned certain holders of the Series C Units $20,230. The notes receivable, which are collateralized by the Series C Units, bear interest at 5.0% per annum and mature on December 15, 2024. The Series C Units are shown on the balance sheet net of the $20,230 loan because the borrower under the loan receivable is also the holder of the Series C Units.

Series D Redeemable Preferred Units

On June 12, 2017, the Operating Partnership completed the acquisition of a store located in Florida. This store was acquired in exchange for $4,270 in cash and 272,400 Series D-5 Preferred Units ("D-5 Units") valued at $6,810.

On November 8, 2016, the Operating Partnership completed the acquisition of a store located in Illinois. This store was acquired in exchange for 486,244 Series D-4 Preferred Units ("D-4 Units") valued at $12,156.

On June 10, 2016, the Operating Partnership completed the acquisition of four stores located in Illinois. These stores were acquired in exchange for 2,201,467 Series D-3 Preferred Units ("D-3 Units") valued at $55,037.

In December 2014, the Operating Partnership completed the acquisition of a store located in Florida. This store was acquired in exchange for $5,621 in cash and 548,390 Series D-1 Preferred Units ("D-1 Units," and together with the D-3 Units, D-4 Units and D-5 Units, "Series D Units") valued at $13,710.

The Partnership Agreement provides for the designation and issuance of the Series D Units. The Series D Units rank junior to the Series A Units, on parity with the Series B Units and Series C Units, and senior to all other partnership interests of the Operating Partnership with respect to distributions and liquidation.

The Series D Units have a liquidation value of $25.00 per unit, for a fixed liquidation value of $87,713. Holders of the Series D Units receive distributions at an annual rate between 3.5% to 5.0%. These distributions are cumulative. The Series D Units become redeemable at the option of the holder on the first anniversary of the date of issuance, which redemption obligation may be satisfied at the Company’s option in cash or shares of its common stock. In addition, the D-3 Units are convertible into OP Units at the option of the holder until the tenth anniversary of the date of issuance, with the number of OP Units to be issued equal to $25.00 per D-3 Unit, divided by the value of a share of common stock as of the exchange date.

11. NONCONTROLLING INTEREST IN OPERATING PARTNERSHIP

The Company’s interest in its stores is held through the Operating Partnership. ESS Holding Business Trust I, a wholly-owned subsidiary of the Company, is the sole general partner of the Operating Partnership. ESS Holding Business Trust II, also a wholly-owned subsidiary of the Company, is a limited partner of the Operating Partnership. Between its general partner and limited partner interests, the Company held a 91.1% ownership interest in the Operating Partnership as of September 30, 2017. The remaining ownership interests in the Operating Partnership (including Preferred Operating Partnership units) of 8.9% are held by certain former owners of assets acquired by the Operating Partnership.

The noncontrolling interest in the Operating Partnership represents OP Units that are not owned by the Company. In conjunction with the formation of the Company, and as a result of subsequent acquisitions, certain persons and entities contributing interests in stores to the Operating Partnership received limited partnership interests in the form of OP Units. Limited partners who received OP Units in the formation transactions or in exchange for contributions for interests in stores have the right to require the Operating Partnership to redeem part or all of their OP Units for cash based upon the fair market value of an equivalent number of shares of the Company’s common stock (based on the ten-day average trading price) at the time of the redemption. Alternatively, the Company may, in its sole discretion, elect to acquire those OP Units in exchange for shares of its common stock on a one-for-one basis, subject to anti-dilution adjustments provided in the Partnership Agreement. The ten-day average closing stock price at September 30, 2017 was $79.26 and there were 5,599,662 OP Units outstanding. Assuming that all of the OP Unit holders exercised their right to redeem all of their OP Units on September 30, 2017 and the Company elected to pay the OP Unit holders cash, the Company would have paid $443,829 in cash consideration to redeem the units.

On August 4, 2017, the Company purchased one store located in Florida. As part of the consideration for this acquisition, 25,520 OP Units were issues with a total value of $2,000.

During the three months ended September 30, 2017, no OP Units were redeemed. During the nine months ended September 30, 2017, 33,896 OP Units were redeemed for $2,510 in cash.

25

EXTRA SPACE STORAGE INC.

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS (unaudited) (continued)

Amounts in thousands, except store and share data, unless otherwise stated

GAAP requires a company to present ownership interests in subsidiaries held by parties other than the company in the consolidated financial statements within the equity section, but separate from the company’s equity. It also requires the amount of consolidated net income attributable to the parent and to the noncontrolling interest to be clearly identified and presented on the face of the consolidated statement of operations, and requires changes in ownership interest to be accounted for similarly as equity transactions. If noncontrolling interests are determined to be redeemable, they are to be carried at their redemption value as of the balance sheet date and reported as temporary equity.

The Company has evaluated the terms of the OP Units and classifies the noncontrolling interest represented by the OP Units as stockholders’ equity in the accompanying condensed consolidated balance sheets. The Company will periodically evaluate individual noncontrolling interests for the ability to continue to recognize the noncontrolling amount as permanent equity in the condensed consolidated balance sheets. Any noncontrolling interests that fail to qualify as permanent equity will be reclassified as temporary equity and adjusted to the greater of (1) the carrying amount and (2) the redemption value as of the end of the period in which the determination is made.

12. OTHER NONCONTROLLING INTERESTS

Other noncontrolling interests represent the ownership interests of a third party in two consolidated joint ventures as of September 30, 2017. One joint venture owns an operating store in Texas, and the other owns a store in Pennsylvania. The voting interests of the third-party owners are between 20.0% and 27.0%.

13. EQUITY IN EARNINGS OF UNCONSOLIDATED REAL ESTATE VENTURES—GAIN ON PURCHASE OF JOINT VENTURE PARTNER'S INTEREST

On September 16, 2016, the Company acquired 23 stores from its ESS PRISA II LLC joint venture ("PRISA II") in a step acquisition. These stores are located in Arizona, California, Connecticut, Florida, Indiana, Kentucky, Massachusetts, Maryland, Michigan, New Jersey, New Mexico, Ohio, Tennessee and Virginia. The Company owned 4.42% of PRISA II, with the other 95.58% owned by affiliates of Prudential Global Investment Management ("Prudential"). PRISA II created a new subsidiary, Extra Space Properties 131 LLC ("ESP 131"), and transferred 23 stores into ESP 131. PRISA II then distributed ESP 131 to the Company and Prudential on a pro rata basis. This distribution was accounted for as a spinoff, and was therefore recorded at the net carrying amount of the properties of $4,326. Immediately after the distribution, the Company acquired Prudential's 95.58% interest in ESP 131 for $238,679, resulting in 100% ownership of ESP 131 and the related 23 stores. Based on the purchase price of Prudential's share of ESP 131, the Company determined that the fair value of its investment in ESP 131 immediately prior to the acquisition of Prudential's share was $10,988, and the Company recorded a gain of $6,662 as a result of re-measuring to fair value its existing equity interest in ESP 131. This gain is included in equity in earnings of unconsolidated real estate ventures - gain on sale of real estate assets and purchase of joint venture partners' interests on the Company's condensed consolidated statements of operations. The Company recorded fixed assets related to this acquisition of $248,530, which includes total cash paid, the investment in ESP 131, and the step acquisition gain, less net assets acquired. Subsequent to these transactions, PRISA II owned 42 stores. The Company sold its 4.42% interest in PRISA II to Prudential immediately following these transactions for $34,758 in cash. The carrying value of the Company's investment prior to the acquisition was $3,912, and the Company recorded a gain on the sale of $30,846. This gain is included in equity in earnings of unconsolidated real estate ventures - gain on sale of real estate assets and purchase of joint venture partners' interests on the Company's condensed consolidated statements of operations.

26

EXTRA SPACE STORAGE INC.

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS (unaudited) (continued)

Amounts in thousands, except store and share data, unless otherwise stated

On February 2, 2016, the Company acquired six stores from its VRS Self Storage LLC joint venture (“VRS”) in a step acquisition. These stores are located in Florida, Maryland, Nevada, New York, and Tennessee. The Company owns 45.0% of VRS, with the other 55.0% owned by affiliates of Prudential. VRS created a new subsidiary, Extra Space Properties 122 LLC (“ESP 122”) and transferred six stores into ESP 122. VRS then distributed ESP 122 to the Company and Prudential on a pro rata basis. This distribution was accounted for as a spinoff, and was therefore recorded at the net carrying amount of the stores of $17,261. Immediately after the distribution, the Company acquired Prudential’s 55.0% interest in ESP 122 for $53,940, resulting in 100% ownership of ESP 122 and the related six stores. Based on the purchase price of Prudential’s share of ESP 122, the Company determined that the fair value of its investment in ESP 122 immediately prior to the acquisition of Prudential’s share was $44,184, and the Company recorded a gain of $26,923 during the nine months ended September 30, 2016 as a result of remeasuring to fair value its existing equity interest in ESP 122. This gain is included in equity in earnings of unconsolidated real estate ventures - gain on sale of real estate assets and purchase of joint venture partners' interests on the Company’s condensed consolidated statements of operations. The Company recorded fixed assets related to this acquisition of $98,082, which includes total cash paid, the investment in ESP 122, and the step acquisition gain, less net assets acquired.

14.    SEGMENT INFORMATION

The Company operates in three distinct segments: (1) rental operations; (2) tenant reinsurance; and (3) property management, acquisition and development. Management fees collected for consolidated joint venture stores are eliminated in consolidation. Financial information for the Company’s business segments is presented below:

	September 30, 2017		December 31, 2016
Balance Sheet
Investment in unconsolidated real estate ventures
Rental operations	$	78,512	$	79,570
Total assets
Rental operations	$	6,728,499	$	6,731,292
Tenant reinsurance	42,786		44,524
Property management, acquisition and development	315,670		315,630
	$	7,086,955	$	7,091,446

	For the Three Months Ended September 30,						For the Nine Months Ended September 30,
	2017			2016			2017			2016
Statement of Operations
Total revenues
Rental operations	$	248,589		$	224,451		$	720,878		$	635,730
Tenant reinsurance	25,882			22,727			73,050			64,936
Property management, acquisition and development	9,685			10,005			29,239			30,193
	284,156			257,183			823,167			730,859
Operating expenses, including depreciation and amortization
Rental operations	115,162			106,530			341,191			312,389
Tenant reinsurance	6,272			4,093			13,996			12,345
Property management, acquisition and development	22,841			23,836			67,489			79,471
	144,275			134,459			422,676			404,205
Income (loss) from operations
Rental operations	133,427			117,921			379,687			323,341
Tenant reinsurance	19,610			18,634			59,054			52,591
Property management, acquisition and development	(13,156		)	(13,831		)	(38,250		)	(49,278		)
	139,881			122,724			400,491			326,654
Gain (loss) on real estate transactions, earnout from prior acquisition and impairment of real estate
Property management, acquisition and development	—			—			(6,019		)	9,814
Interest expense
Rental operations	(38,379		)	(32,619		)	(109,414		)	(95,125		)
Property management, acquisition and development	(1,387		)	(875		)	(3,778		)	(2,530		)
	(39,766		)	(33,494		)	(113,192		)	(97,655		)
Non-cash interest expense related to the amortization of discount on equity component of exchangeable senior notes
Property management, acquisition and development	(1,268		)	(1,243		)	(3,827		)	(3,716		)
Interest income
Property management, acquisition and development	869			1,358			2,797			4,697
Interest income on note receivable from Preferred Operating Partnership unit holder
Property management, acquisition and development	532			1,213			2,404			3,638
Equity in earnings of unconsolidated real estate ventures
Rental operations	3,990			3,625			11,407			9,813
Equity in earnings of unconsolidated real estate ventures - gain on sale of real estate assets and purchase of joint venture partners' interests
Property management, acquisition and development	—			37,509			—			64,432
Income tax (expense) benefit
Rental operations	(834		)	(550		)	(1,759		)	(1,840		)
Tenant reinsurance	(3,572		)	(3,504		)	(10,701		)	(9,352		)
Property management, acquisition and development	1,243			(412		)	3,306			188
	(3,163		)	(4,466		)	(9,154		)	(11,004		)
Net income (loss)
Rental operations	98,204			88,377			279,921			236,189
Tenant reinsurance	16,038			15,130			48,353			43,239
Property management, acquisition and development	(13,167		)	23,719			(43,367		)	27,245
	$	101,075		$	127,226		$	284,907		$	306,673

	For the Three Months Ended September 30,				For the Nine Months Ended September 30,
	2017		2016		2017			2016
Depreciation and amortization expense
Rental operations	$	44,732	$	44,189	$	136,821		$	126,506
Property management, acquisition and development	3,343		2,366		7,318			6,896
	$	48,075	$	46,555	$	144,139		$	133,402
Statement of Cash Flows
Acquisition of real estate assets
Property management, acquisition and development					$	(119,040	)	$	(763,246	)
Development and redevelopment of real estate assets
Property management, acquisition and development					$	(20,670	)	$	(18,492	)

15. COMMITMENTS AND CONTINGENCIES

As of September 30, 2017, the Company is involved in various legal proceedings and is subject to various claims and complaints arising in the ordinary course of business. Because litigation is inherently unpredictable, the outcome of these matters cannot presently be determined with any degree of certainty. In accordance with applicable accounting guidance, management establishes an accrued liability for litigation when those matters present loss contingencies that are both probable and reasonably estimable. In such cases, there may be an exposure to loss in excess of any amounts accrued. The estimated loss, if any, is based upon currently available information and is subject to significant judgment, a variety of assumptions, and known and unknown uncertainties. The Company could in the future incur judgments or enter into settlements of claims that could have a material adverse effect on its results of operations in any particular period, notwithstanding the fact that the Company is currently vigorously defending any legal proceedings against it.

As of September 30, 2017, the Company was under agreement to acquire 35 stores at a total purchase price of $462,116. Of these stores, 23 are scheduled to close in 2017 at a purchase price of $308,225, nine are scheduled to close in 2018 at a purchase price of $118,463, and three are scheduled to close thereafter at a purchase price of $35,428. Additionally, the Company is under agreement to acquire 19 stores with joint venture partners, for a total investment of $96,750. Six of these stores are scheduled to close in 2017, while the remaining 13 stores are expected to close in 2018.

The Company owns and/or operates stores located in Texas, Florida, and Puerto Rico that were impacted by Hurricanes Harvey, Irma, and Maria during the three months ended September 30, 2017. Losses incurred to date by these hurricanes include property damage, net of insurance recoveries, of $2,110, and tenant reinsurance claims of $2,250, which are included in property operations and tenant reinsurance on the Company's condensed consolidated statements of operations.

Although there can be no assurance, the Company is not aware of any material environmental liability, for which it believes it will be ultimately responsible, that could have a material adverse effect on its financial condition or results of operations. However, changes in applicable environmental laws and regulations, the uses and conditions of properties in the vicinity of the Company’s stores, the activities of its tenants and other environmental conditions of which the Company is unaware with respect to its stores could result in future material environmental liabilities.

16.     SUBSEQUENT EVENTS

Subsequent to September 30, 2017, the Company purchased seven stores located in Georgia, Maryland, Oregon, Virginia and Washington for a total purchase price of $83,125.

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ITEM 2. MANAGEMENT’S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS

Amounts in thousands, except store and share data

CAUTIONARY LANGUAGE

The following discussion and analysis should be read in conjunction with our unaudited “Condensed Consolidated Financial Statements” and the “Notes to Condensed Consolidated Financial Statements (unaudited)” appearing elsewhere in this report and the “Consolidated Financial Statements,” “Notes to Consolidated Financial Statements” and “Management’s Discussion and Analysis of Financial Condition and Results of Operations” contained in our Form 10-K for the year ended December 31, 2016. We make statements in this section that are forward-looking statements within the meaning of the federal securities laws. For a complete discussion of forward-looking statements, see the section in this Form 10-Q entitled “Statement on Forward-Looking Information.”

CRITICAL ACCOUNTING POLICIES

Our discussion and analysis of our financial condition and results of operations are based on our unaudited condensed consolidated financial statements contained elsewhere in this report, which have been prepared in accordance with GAAP. Our notes to the unaudited condensed consolidated financial statements contained elsewhere in this report and the audited financial statements contained in our Form 10-K for the year ended December 31, 2016 describe the significant accounting policies essential to our unaudited condensed consolidated financial statements. Preparation of our financial statements requires estimates, judgments and assumptions. We believe that the estimates, judgments and assumptions that we have used are appropriate and correct based on information available at the time they were made. These estimates, judgments and assumptions can affect our reported assets and liabilities as of the date of the financial statements, as well as the reported revenues and expenses during the period presented. If there are material differences between these estimates, judgments and assumptions and actual facts, our financial statements may be affected.

In many cases, the accounting treatment of a particular transaction is specifically dictated by GAAP and does not require our judgment in its application. There are areas in which our judgment in selecting among available alternatives would not produce a materially different result, but there are some areas in which our judgment in selecting among available alternatives would produce a materially different result. See the notes to the unaudited condensed consolidated financial statements that contain additional information regarding our accounting policies and other disclosures.

OVERVIEW

We are a fully integrated, self-administered and self-managed REIT, formed to continue the business commenced in 1977 by Extra Space Storage LLC and its subsidiaries to own, operate, manage, acquire, develop and redevelop professionally managed self-storage stores.

We derive substantially all of our revenues from rents received from tenants under leases at each of our wholly-owned stores; from our tenant reinsurance program; and from management fees on the stores we manage for joint venture partners and unaffiliated third parties. Our management fee is equal to approximately 6.0% of cash collected from the managed stores.

We operate in competitive markets, often where consumers have multiple stores from which to choose. Competition has impacted, and will continue to impact, our store results. We experience seasonal fluctuations in occupancy levels, with occupancy levels generally higher in the summer months due to increased moving activity. Our operating results depend materially on our ability to lease available self-storage units and actively manage rental rates, and on the ability of our tenants to make required rental payments. We believe that we are able to respond quickly and effectively to changes in local, regional and national economic conditions by centrally adjusting rental rates through the combination of our revenue management team and our industry-leading technology systems.

We continue to evaluate a range of new initiatives and opportunities in order to enable us to maximize stockholder value. Our strategies to maximize stockholder value include the following:

28

• Maximize the performance of our stores through strategic, efficient and proactive management. We pursue revenue-generating and expense-minimizing opportunities in our operations. Our revenue management team seeks to maximize revenue by responding to changing market conditions through our advanced technology system’s ability to provide real-time, interactive rental rate and discount management. Our size allows us greater ability than the majority of our competitors to implement more effective online marketing programs, which we believe will attract more customers to our stores at a lower net cost.

• Acquire self-storage stores. Our acquisitions team continues to pursue the acquisition of multi-store portfolios and single stores that we believe can provide stockholder value. We have established a reputation as a reliable, ethical buyer, which we believe enhances our ability to negotiate and close acquisitions. In addition, we believe our status as an UPREIT enables flexibility when structuring deals. We continue to review available acquisitions. We remain a disciplined buyer and only execute acquisitions that we believe will strengthen our portfolio and increase stockholder value.

• Expand our management business. Our management business enables us to generate increased revenues through management fees and to expand our geographic footprint. We believe this expanded footprint enables us to reduce our operating costs through economies of scale. In addition, we see our management business as a future acquisition pipeline. We pursue strategic relationships with owners whose stores would enhance our portfolio in the event an opportunity arises to acquire such stores.

PROPERTIES

As of September 30, 2017, we owned, had ownership interests in, or managed 1,513 stores in 38 states, Washington, D.C. and Puerto Rico. Of these 1,513 stores, we owned 844 stores, we held joint venture interests in 184 stores, and our taxable REIT subsidiary, Extra Space Management, Inc., operated an additional 485 stores that are owned by third parties. These operating stores contain approximately 114.0 million square feet of rentable space in approximately 1.0 million units.

Our stores are generally situated in convenient, highly visible locations clustered around large population centers such as Atlanta, Baltimore/Washington, D.C., Boston, Chicago, Dallas, Houston, Las Vegas, Los Angeles, Miami, New York City, Orlando, Philadelphia, Phoenix, St. Petersburg/Tampa and San Francisco/Oakland. These markets contain above-average population growth and income demographics. The clustering of assets around these population centers enables us to reduce our operating costs through economies of scale. Our acquisitions and management business have given us an increased scale in many core markets as well as a foothold in many markets where we had no previous presence.

We consider a store to be in the lease-up stage after it has been issued a certificate of occupancy, but before it has achieved stabilization. We consider a store to be stabilized once it has achieved either an 80% average occupancy rate for a full year measured as of January 1 of the current year, or has been open for three years prior to January 1 of the current year.

As of September 30, 2017, approximately 920,000 tenants were leasing storage units at the 1,513 operating stores that we own and/or manage, primarily on a month-to-month basis, providing the flexibility to increase rental rates over time as market conditions permit. Existing tenants generally receive rate increases at least annually, for which no direct correlation has been drawn to our vacancy trends. Although leases are short-term in duration, the typical tenant tends to remain at our stores for an extended period of time. For stores that were stabilized as of September 30, 2017, the average length of stay was approximately 14.5 months for tenants who have vacated in the last 12 months.

The average annual rent per square foot for our existing customers at stabilized stores, net of discounts and bad debt, was $15.77for the three months ended September 30, 2017, compared to $15.24for the three months ended September 30, 2016. Average annual rent per square foot for new leases was $16.90for the three months ended September 30, 2017, compared to $16.06for the three months ended September 30, 2016. The average discount, as a percentage of rental revenues, during these periods was 3.7% and 2.9%, respectively.

Our store portfolio is made up of different types of construction and building configurations depending on the site and the municipality where it is located. Most often sites are what we consider “hybrid” stores, a mix of drive-up and multi-floor buildings. We have a number of multi-floor buildings with elevator access only, and a number of stores featuring ground-floor access only.

29

Stabilized Store Data Based on Location

The following table presents additional information regarding the occupancy of our stabilized stores by state as of September 30, 2017 and 2016. The information as of September 30, 2016 is on a pro forma basis as though all the stores owned and/or managed at September 30, 2017 were under our control as of September 30, 2016.

		Company	Pro forma	Company	Pro forma	Company		Pro forma
Location	Number of Stores	Number of Units as of September 30, 2017 (1)	Number of Units as of September 30, 2016	Net Rentable Square Feet as of September 30, 2017 (2)	Net Rentable Square Feet as of September 30, 2016	Square Foot Occupancy % September 30, 2017		Square Foot Occupancy % September 30, 2016
Wholly-Owned Stores
Alabama	8	4,691	4,650	556,216	556,971	91.2	%	90.1	%
Arizona	22	13,773	13,640	1,530,770	1,531,922	93.6	%	91.3	%
California	143	110,726	108,965	11,395,369	11,369,700	95.3	%	94.4	%
Colorado	13	7,080	6,656	852,884	822,689	91.6	%	91.6	%
Connecticut	7	5,101	4,966	496,026	485,247	94.0	%	92.9	%
Florida	78	56,628	55,796	5,965,751	5,942,885	94.4	%	93.1	%
Georgia	49	30,130	29,401	3,811,743	3,765,111	94.1	%	91.7	%
Hawaii	9	8,550	8,523	603,411	603,349	93.8	%	93.2	%
Illinois	27	19,152	18,703	2,057,271	2,016,245	92.6	%	92.0	%
Indiana	15	7,924	7,802	943,029	940,348	93.3	%	93.2	%
Kansas	1	532	529	49,989	49,999	96.3	%	96.2	%
Kentucky	10	5,901	5,876	767,669	757,090	91.9	%	91.8	%
Louisiana	2	1,407	1,405	149,930	149,880	95.2	%	93.3	%
Maryland	29	22,487	22,337	2,294,086	2,291,567	92.6	%	92.5	%
Massachusetts	38	23,924	23,815	2,363,571	2,363,819	94.1	%	91.6	%
Michigan	4	2,401	2,388	324,276	323,976	94.8	%	94.4	%
Minnesota	1	740	740	74,550	74,550	94.0	%	76.7	%
Mississippi	3	1,510	1,511	217,442	218,282	92.5	%	89.7	%
Missouri	6	3,332	3,290	389,411	385,951	94.2	%	92.4	%
Nevada	15	9,191	9,111	1,313,933	1,313,545	95.3	%	92.6	%
New Hampshire	2	1,046	1,043	125,987	126,053	89.8	%	94.5	%
New Jersey	58	45,967	45,458	4,507,390	4,498,001	95.3	%	93.1	%
New Mexico	12	6,656	6,579	751,518	749,053	94.7	%	93.4	%
New York	21	19,310	19,241	1,553,309	1,549,618	93.5	%	92.9	%
North Carolina	12	7,937	7,845	848,649	847,269	92.5	%	90.8	%
Ohio	17	9,545	9,536	1,250,475	1,248,121	92.8	%	92.5	%
Oregon	4	2,792	2,738	327,487	326,977	93.7	%	91.6	%
Pennsylvania	14	9,832	9,625	1,053,644	1,046,635	91.8	%	91.2	%
Rhode Island	2	1,301	1,274	131,021	131,521	95.7	%	95.0	%
South Carolina	21	12,082	11,898	1,572,859	1,569,374	92.6	%	89.5	%
Tennessee	23	13,041	12,864	1,755,104	1,767,356	92.9	%	92.3	%
Texas	90	59,106	58,661	7,582,540	7,526,015	92.6	%	90.0	%
Utah	7	3,861	3,870	476,999	477,034	93.7	%	94.2	%

30

		Company	Pro forma	Company	Pro forma	Company		Pro forma
Location	Number of Stores	Number of Units as of September 30, 2017 (1)	Number of Units as of September 30, 2016	Net Rentable Square Feet as of September 30, 2017 (2)	Net Rentable Square Feet as of September 30, 2016	Square Foot Occupancy % September 30, 2017		Square Foot Occupancy % September 30, 2016
Virginia	41	31,025	30,804	3,288,449	3,283,976	93.0	%	91.2	%
Washington	7	4,330	4,301	509,638	509,358	96.5	%	94.8	%
Washington, DC	1	1,219	1,220	99,689	99,739	92.4	%	92.3	%
Total Wholly-Owned Stabilized	812	564,230	557,061	61,992,085	61,719,226	93.8	%	92.3	%
Joint-Venture Stores
Alabama	1	619	602	75,296	74,856	96.1	%	93.5	%
Arizona	6	3,747	3,725	429,273	428,883	93.6	%	92.2	%
California	47	34,171	33,887	3,279,318	3,283,061	94.5	%	94.5	%
Colorado	2	1,333	1,315	160,654	157,986	91.6	%	93.0	%
Connecticut	5	3,770	3,759	405,190	403,910	91.6	%	92.1	%
Delaware	1	561	603	76,765	71,910	88.5	%	82.7	%
Florida	12	10,047	9,988	1,006,891	1,002,212	96.0	%	93.2	%
Georgia	1	614	608	81,770	81,820	92.5	%	88.9	%
Illinois	4	2,685	2,692	288,399	288,115	90.7	%	92.0	%
Indiana	1	454	445	57,010	56,954	92.8	%	97.1	%
Kansas	2	848	845	109,170	109,375	96.7	%	92.2	%
Kentucky	3	1,399	1,374	158,980	153,825	90.5	%	94.9	%
Maryland	7	5,901	5,881	531,126	529,070	92.6	%	92.2	%
Massachusetts	9	5,132	5,114	534,378	534,877	91.6	%	92.5	%
Michigan	5	3,228	3,207	396,749	397,059	94.6	%	92.9	%
Missouri	1	544	542	61,375	61,075	93.0	%	92.1	%
Nevada	2	1,212	1,205	123,610	123,565	98.3	%	93.9	%
New Hampshire	2	805	794	85,061	83,845	91.4	%	91.9	%
New Jersey	13	10,403	10,328	1,029,694	1,029,588	94.3	%	92.4	%
New Mexico	2	1,051	1,047	134,403	134,371	93.3	%	91.5	%
New York	8	7,750	7,677	653,499	649,362	94.0	%	93.3	%
Ohio	5	2,896	2,877	382,178	381,432	93.6	%	92.7	%
Oregon	1	654	652	64,970	64,970	94.6	%	95.5	%
Pennsylvania	4	2,728	2,699	314,845	312,995	93.5	%	90.9	%
Tennessee	6	3,864	3,799	475,155	474,990	93.2	%	93.4	%
Texas	10	5,784	5,789	672,110	672,696	92.2	%	92.0	%
Virginia	7	5,093	5,090	514,117	514,172	80.2	%	90.9	%
Washington, DC	1	1,691	1,694	104,382	104,454	87.9	%	91.5	%
Total Joint-Venture Stabilized	168	118,984	118,238	12,206,368	12,181,428	93.1	%	93.0	%
Managed Stores
Alabama	9	4,202	4,232	595,551	602,341	92.0	%	90.7	%
Arizona	5	2,619	2,633	312,159	312,407	90.8	%	84.8	%
California	75	52,308	50,511	6,229,279	6,054,110	94.2	%	93.5	%
Colorado	16	8,853	8,596	1,039,790	1,044,988	89.7	%	88.3	%
Connecticut	2	1,423	1,414	182,380	182,149	94.8	%	90.9	%

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		Company	Pro forma	Company	Pro forma	Company		Pro forma
Location	Number of Stores	Number of Units as of September 30, 2017 (1)	Number of Units as of September 30, 2016	Net Rentable Square Feet as of September 30, 2017 (2)	Net Rentable Square Feet as of September 30, 2016	Square Foot Occupancy % September 30, 2017		Square Foot Occupancy % September 30, 2016
Florida	49	33,975	33,489	4,026,357	4,015,636	94.6	%	92.8	%
Georgia	8	4,098	3,962	578,397	573,080	94.4	%	93.7	%
Hawaii	6	4,801	4,685	353,629	352,278	93.7	%	91.3	%
Illinois	12	7,144	7,159	743,634	744,437	91.0	%	90.7	%
Indiana	4	2,034	2,020	238,358	238,028	90.1	%	91.8	%
Kansas	1	570	572	70,480	70,480	97.2	%	94.4	%
Kentucky	2	1,328	1,332	218,334	218,887	93.9	%	92.2	%
Louisiana	1	987	987	133,360	133,325	97.6	%	92.2	%
Maryland	21	15,214	15,214	1,477,429	1,475,581	93.5	%	91.2	%
Massachusetts	3	1,543	1,540	182,945	182,945	90.2	%	92.1	%
Michigan	6	3,364	3,352	417,754	416,650	96.2	%	92.7	%
Mississippi	1	371	371	50,325	50,325	89.9	%	66.3	%
Missouri	3	1,663	1,582	186,319	182,910	93.2	%	92.8	%
Nevada	11	9,451	9,398	1,142,141	1,142,571	96.1	%	90.6	%
New Jersey	6	4,528	4,514	388,799	391,541	93.8	%	87.9	%
New Mexico	2	1,267	1,261	164,525	163,245	89.9	%	84.0	%
New York	13	11,028	11,012	676,752	676,510	89.4	%	80.6	%
North Carolina	20	8,599	8,440	1,176,243	1,181,578	91.5	%	85.4	%
Ohio	5	2,291	2,249	274,670	274,870	91.4	%	94.3	%
Oklahoma	11	5,864	5,823	970,694	953,385	88.8	%	80.6	%
Oregon	1	445	447	39,300	39,430	92.4	%	93.7	%
Pennsylvania	18	10,859	10,715	1,253,565	1,244,635	91.8	%	92.4	%
South Carolina	5	3,629	3,624	448,567	450,659	94.2	%	92.2	%
Tennessee	4	2,282	2,151	287,694	282,263	92.4	%	94.1	%
Texas	26	15,576	15,592	2,224,973	2,217,402	89.6	%	90.6	%
Utah	5	2,767	2,781	400,207	408,122	93.1	%	90.4	%
Virginia	7	4,209	4,209	425,899	426,299	90.6	%	90.7	%
Washington	3	1,557	1,564	194,327	181,897	93.2	%	94.3	%
Wisconsin	1	680	680	90,926	90,926	90.1	%	74.3	%
Puerto Rico	4	2,728	2,725	288,258	289,620	91.1	%	86.6	%
Total Managed Stabilized	366	234,257	230,836	27,484,020	27,265,510	92.8	%	90.8	%
Total Stabilized Stores	1,346	917,471	906,135	101,682,473	101,166,164	93.5	%	92.0	%

(1) Represents unit count as of September 30, 2017, which may differ from unit count as of September 30, 2016 due to unit conversions or expansions.

(2) Represents net rentable square feet as of September 30, 2017, which may differ from rentable square feet as of September 30, 2016 due to unit conversions or expansions.

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Lease-up Store Data Based on Location

The following table presents additional information regarding the occupancy of our lease-up stores by state as of September 30, 2017 and 2016. The information as of September 30, 2016 is on a pro forma basis as though all the stores owned and/or managed at September 30, 2017 were under our control as of September 30, 2016.

		Company	Pro forma	Company	Pro forma	Company		Pro forma
Location	Number of Stores	Number of Units as of September 30, 2017 (1)	Number of Units as of September 30, 2016	Net Rentable Square Feet as of September 30, 2017 (2)	Net Rentable Square Feet as of September 30, 2016	Square Foot Occupancy % September 30, 2017		Square Foot Occupancy % September 30, 2016
Wholly-Owned Stores
Arizona	1	606	609	63,395	63,395	98.5	%	88.1	%
California	4	2,662	2,606	258,633	253,638	87.9	%	60.0	%
Florida	4	2,889	1,056	287,310	113,163	62.2	%	92.3	%
Georgia	6	3,695	3,667	442,453	442,273	84.9	%	53.6	%
Illinois	3	2,724	2,659	252,854	238,754	69.9	%	19.4	%
Massachusetts	2	2,013	1,971	139,918	138,931	80.9	%	54.6	%
New York	1	822	820	100,470	100,480	58.3	%	58.3	%
North Carolina	3	2,277	1,797	204,254	163,919	79.3	%	73.0	%
South Carolina	1	695	695	78,680	78,680	86.2	%	77.9	%
Texas	5	2,989	2,981	411,226	411,396	90.0	%	81.8	%
Utah	2	1,211	998	143,244	110,875	84.7	%	39.1	%
Total Wholly-Owned in Lease-up	32	22,583	19,859	2,382,437	2,115,504	80.3	%	61.0	%
Joint-Venture Stores
Arizona	1	606	602	62,200	62,200	94.5	%	87.4	%
Colorado	1	816	815	84,855	84,640	82.2	%	32.5	%
Florida	3	1,951	—	202,718	—	55.4	%	—	%
Massachusetts	1	487	—	50,330	—	37.8	%	—	%
New Jersey	1	868	872	74,131	74,152	95.0	%	90.9	%
New York	3	3,856	3,855	209,157	209,387	75.0	%	40.6	%
Pennsylvania	1	780	—	76,666	—	32.4	%	—	%
Oregon	2	792	796	71,465	71,670	78.3	%	31.5	%
Texas	1	527	533	55,325	55,275	88.7	%	43.1	%
South Carolina	1	686	669	83,826	78,085	91.5	%	68.1	%
Washington	1	623	637	82,301	82,345	86.0	%	46.5	%
Total Joint-Venture in Lease-up	16	11,992	8,779	1,052,974	717,754	72.6	%	51.9	%
Managed Stores
Arizona	2	1,848	1,842	211,839	212,789	67.1	%	47.8	%
California	4	3,692	2,887	460,356	350,486	71.8	%	44.1	%
Colorado	5	3,375	1,232	418,254	147,604	45.6	%	81.1	%
Connecticut	2	861	—	112,282	—	35.0	%	—	%
Florida	13	8,667	595	842,555	70,870	36.3	%	85.1	%
Georgia	4	2,893	639	301,880	78,305	41.8	%	—	%
Hawaii	1	641	—	51,552	—	3.8	%	—	%

33

		Company	Pro forma	Company	Pro forma	Company		Pro forma
Location	Number of Stores	Number of Units as of September 30, 2017 (1)	Number of Units as of September 30, 2016	Net Rentable Square Feet as of September 30, 2017 (2)	Net Rentable Square Feet as of September 30, 2016	Square Foot Occupancy % September 30, 2017		Square Foot Occupancy % September 30, 2016
Illinois	10	6,717	3,159	676,862	335,645	45.5	%	30.6	%
Indiana	5	3,025	1,995	361,154	237,586	74.2	%	51.1	%
Kentucky	2	955	522	94,410	43,235	24.9	%	0.1	%
Maryland	3	1,604	399	180,444	28,280	56.3	%	83.8	%
Massachusetts	2	1,921	1,922	153,592	153,603	72.2	%	44.0	%
Minnesota	5	3,135	644	324,652	62,389	74.0	%	80.3	%
Missouri	1	704	—	68,042	—	17.4	%	—	%
Nevada	1	764	764	153,571	153,571	85.0	%	61.6	%
New Hampshire	3	1,098	372	109,948	35,196	48.7	%	45.0	%
New Jersey	3	2,208	754	239,725	109,877	67.9	%	44.5	%
New Mexico	2	797	393	162,369	79,019	40.9	%	45.0	%
North Carolina	9	6,044	2,499	648,738	297,221	62.0	%	64.1	%
Ohio	2	996	538	111,254	67,860	77.7	%	82.3	%
Oklahoma	4	1,896	293	271,336	67,750	30.3	%	1.4	%
Pennsylvania	2	1,474	—	133,766	—	34.3	%	—	%
Rhode Island	1	692	692	83,865	83,865	64.7	%	56.0	%
South Carolina	5	3,246	627	381,081	67,375	62.8	%	84.9	%
Texas	19	14,241	6,055	1,582,841	702,663	43.0	%	26.4	%
Utah	1	386	405	44,199	44,149	90.2	%	48.2	%
Virginia	3	2,630	—	274,796	—	44.3	%	—	%
Washington, DC	1	882	—	73,237	—	44.6	%	—	%
Wisconsin	4	3,386	1,154	391,641	153,775	34.6	%	31.7	%
Total Managed in Lease-up	119	80,778	30,382	8,920,241	3,583,113	50.8	%	50.8	%
Total Lease-up Stores	167	115,353	59,020	12,355,652	6,416,371	50.9	%	58.4	%

(1) Represents unit count as of September 30, 2017, which may differ from unit count as of September 30, 2016 due to unit conversions or expansions.

(2) Represents net rentable square feet as of September 30, 2017, which may differ from rentable square feet as of September 30, 2016 due to unit conversions or expansions.

RESULTS OF OPERATIONS

Comparison of the three and nine months ended September 30, 2017 and 2016

Overview

Results for the three and nine months ended September 30, 2017 included the operations of 1,028 stores (844 wholly-owned, two in consolidated joint ventures, and 182 in joint ventures accounted for using the equity method) compared to the results for the three and nine months ended September 30, 2016, which included the operations of 999 stores (810 wholly-owned, one in a consolidated joint venture, and 188 in joint ventures accounted for using the equity method).

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Revenues

The following table presents information on revenues earned for the periods indicated: 

	For the Three Months Ended September 30,									For the Nine Months Ended September 30,
	2017		2016		$ Change			% Change		2017		2016		$ Change			% Change
Revenues:
Property rental	$	248,589	$	224,451	$	24,138		10.8	%	$	720,878	$	635,730	$	85,148		13.4	%
Tenant reinsurance	25,882		22,727		3,155			13.9	%	73,050		64,936		8,114			12.5	%
Management fees and other income	9,685		10,005		(320		)	(3.2	)%	29,239		30,193		(954		)	(3.2	)%
Total revenues	$	284,156	$	257,183	$	26,973		10.5	%	$	823,167	$	730,859	$	92,308		12.6	%

Property Rental—The increase in property rental revenues for the three and nine months ended September 30, 2017 was primarily the result of an increase of $14,506 and $52,487, respectively, associated with acquisitions completed in 2017 and 2016. We acquired nine stores during the nine months ended September 30, 2017 and 99 stores during the year ended December 31, 2016. Property rental revenue also increased by $9,990 and $31,727, respectively, during the three and nine months ended September 30, 2017, as a result of increases in occupancy and rental rates to new and existing customers at our stabilized stores. Occupancy at our wholly-owned stabilized stores increased to 93.8% at September 30, 2017, as compared to 92.3% at September 30, 2016. The rental rate to new tenants on wholly-owned stores for the three months ended September 30, 2017 increased an average of approximately 4.8% over the same period in the prior year.

Tenant Reinsurance—The increase in our tenant reinsurance revenues was due primarily to the increase in the number of stores operated. We operated 1,513 stores at September 30, 2017 compared to 1,421 stores at September 30, 2016. Additionally, the average dollar per policy was higher during the three and nine months ended September 30, 2017 when compared to the same period in the prior year.

Management Fees and Other Income—Our taxable REIT subsidiary (“TRS”), Extra Space Management, Inc., manages stores owned by our joint ventures and third parties. Management fees generally represent approximately 6.0% of cash collected from these stores.

Expenses

The following table presents information on expenses for the periods indicated:

	For the Three Months Ended September 30,									For the Nine Months Ended September 30,
	2017		2016		$ Change			% Change		2017		2016		$ Change			% Change
Expenses:
Property operations	$	70,430	$	62,341	$	8,089		13.0	%	$	204,370	$	185,883	$	18,487		9.9	%
Tenant reinsurance	6,272		4,093		2,179			53.2	%	13,996		12,345		1,651			13.4	%
Acquisition related costs and other	—		1,933		(1,933		)	(100.0	)%	—		9,124		(9,124		)	(100.0	)%
General and administrative	19,498		19,537		(39		)	(0.2	)%	60,171		63,451		(3,280		)	(5.2	)%
Depreciation and amortization	48,075		46,555		1,520			3.3	%	144,139		133,402		10,737			8.0	%
Total expenses	$	144,275	$	134,459	$	9,816		7.3	%	$	422,676	$	404,205	$	18,471		4.6	%

Property Operations—The increase in property operations expense during the three and nine months ended September 30, 2017 was due primarily to an increase of $4,460 and $16,943, respectively, related to store acquisitions completed in 2017 and 2016. We acquired nine operating stores during the nine months ended September 30, 2017, and 99 operating stores during the year ended December 31, 2016. In addition, a loss of $2,110,000, net of reinsurance proceeds, was recorded for the three and nine months ended September 30, 2017 related to the recent hurricanes.

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Tenant Reinsurance—Tenant reinsurance expense represents the costs that are incurred to provide tenant reinsurance. The increase in tenant reinsurance expense is primarily due to the additional claims from recent hurricanes Harvey, Irma and Maria as well as an increase in the total number of properties covered when compared to the prior year.

Acquisition Related Costs and Other—For the three and nine months ended September 30, 2016, these costs represented closing and other transaction costs incurred in connection with our acquisition of operating stores, which were accounted for as business combinations. On January 1, 2017, we adopted the guidance in ASU 2017-01, "Business Combinations (Topic 805) - Clarifying the Definition of a Business," which provides that when substantially all of the fair value of the gross assets acquired is concentrated in a single identifiable asset or a group of similar identifiable assets, the set of assets is not a business. As a result of the adoption of this guidance, acquisitions of operating stores are now considered asset acquisitions, under which transaction costs are capitalized as a component of the cost of the assets acquired, rather than being expensed as incurred as required with business combinations.

General and Administrative—General and administrative expenses primarily include all expenses not directly related to our stores, including corporate payroll, travel and professional fees. These expenses are recognized as incurred. General and administrative expenses for the nine months ended September 30, 2017 decreased when compared to the same period in the prior year primarily as a result of an expense of $4,000 that was recorded during the nine months ended September 30, 2016 related to the accrual of a legal settlement. There were no such expenses during the three and nine months ended September 30, 2017. During the three months ended June 30, 2017, this legal proceeding was settled and a payment was made against the related accrued liability. We did not observe any other material trends in specific payroll, travel or other expenses that contributed to the decrease in general and administrative expenses.

Depreciation and Amortization—Depreciation and amortization expense increased as a result of the acquisition of new stores. We acquired nine operating stores during the nine months ended September 30, 2017 and 99 operating stores during the year ended December 31, 2016.

Other Revenues and Expenses

The following table presents information about other revenues and expenses for the periods indicated:

	For the Three Months Ended September 30,											For the Nine Months Ended September 30,
	2017			2016			$ Change			% Change		2017			2016			$ Change			% Change
Other income and expenses:
Gain (loss) on real estate transactions, earnout from prior acquisition and impairment of real estate	$	—		$	—		$	—		—	%	$	(6,019	)	$	9,814		$	(15,833	)	(161.3	)%
Interest expense	(39,766		)	(33,494		)	(6,272		)	18.7	%	(113,192		)	(97,655		)	(15,537		)	15.9	%
Non-cash interest expense related to amortization of discount on equity component of exchangeable senior notes	(1,268		)	(1,243		)	(25		)	2.0	%	(3,827		)	(3,716		)	(111		)	3.0	%
Interest income	869			1,358			(489		)	(36.0	)%	2,797			4,697			(1,900		)	(40.5	)%
Interest income on note receivable from Preferred Operating Partnership unit holder	532			1,213			(681		)	(56.1	)%	2,404			3,638			(1,234		)	(33.9	)%
Equity in earnings of unconsolidated real estate ventures	3,990			3,625			365			10.1	%	11,407			9,813			1,594			16.2	%
Equity in earnings of unconsolidated real estate ventures - gain on sale of real estate assets and purchase of joint venture partners' interests	—			37,509			(37,509		)	0.0	%	—			64,432			(64,432		)	(100.0	)%
Income tax expense	(3,163		)	(4,466		)	1,303			(29.2	)%	(9,154		)	(11,004		)	1,850			(16.8	)%
Total other expense, net	$	(38,806	)	$	4,502		$	(43,308	)	(962.0	)%	$	(115,584	)	$	(19,981	)	$	(95,603	)	478.5	%

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Gain (Loss) on Real Estate Transactions, Earnout from Prior Acquisition and Impairment of Real Estate — During the nine months ended September 30, 2017, we recorded an impairment loss of $6,019 relating to one parcel of land held for sale and an additional two parcels of undeveloped land where the carrying value was greater than the fair value. During the nine months ended September 30, 2016, we recorded a gain of $9,814. This amount was comprised of a gain of $11,358 on the disposition of seven stores in April 2016, and a loss of $1,544, related to an earnout provision from the acquisition of a small portfolio of stores that were acquired in 2014.

Interest Expense—The increase in interest expense during the three and nine months ended September 30, 2017 was primarily the result of an overall increase in debt this period when compared to the same period in the prior year. The total face value of our debt, including our lines of credit, was $4,362,400 at September 30, 2017 compared to $4,047,217 at September 30, 2016. Additionally, the average interest rate on the total of our fixed- and variable-rate debt at September 30, 2017 was 3.3%, compared to 3.1% as of September 30, 2016.

Non-cash Interest Expense Related to Amortization of Discount on Equity Component of Exchangeable Senior Notes—Represents the amortization of the discounts related to the equity components of the exchangeable senior notes issued by our Operating Partnership. The 2013 Notes and 2015 Notes both have an effective interest rate of 4.0% relative to the carrying amount of the liability. 

Interest Income—Interest income represents amounts earned on cash and cash equivalents deposited with financial institutions and interest earned on notes receivable. The decrease for the three and nine months ended September 30, 2017 related primarily to the decrease in notes receivable when compared to the same period in the prior year. We had $28,005 of notes receivable included in assets on the condensed consolidated balance sheets as of September 30, 2017, compared to $67,098 as of September 30, 2016. 

Interest Income on Note Receivable from Preferred Operating Partnership Unit Holders—Represents interest on a $100,000 loan to the holders of the Series A Participating Redeemable Preferred Units of our Operating Partnership (“Series A Units”). The decreases for the three and nine months ended September 30, 2017 are a result of an amendment signed in April 2017 that decreased the interest rate of the note receivable from 4.9% to 2.1%.

Equity in Earnings of Unconsolidated Real Estate Ventures—Equity in earnings of unconsolidated real estate ventures represents the income earned through our ownership interests in unconsolidated joint ventures. In these joint ventures, we and our joint venture partners generally receive a preferred return on our invested capital. To the extent that cash/profits in excess of these preferred returns are generated, we receive a higher percentage of the excess cash/profits. The increase for the three and nine months ended September 30, 2017 compared to the same period in the prior year was primarily the result of three of our joint ventures generating cash in excess of the preferred returns, resulting in increased distributions and equity in earnings. This increase was slightly offset by a decrease in the number of stores owned by our joint ventures as a result of transactions, including the acquisition of 40 stores from joint ventures during the year ended December 31, 2016.

Equity in Earnings of Unconsolidated Real Estate Ventures—Gain on Sale of Real Estate Assets and Purchase of Joint Venture Partners' Interests—On February 2, 2016, we acquired six stores from our VRS Self Storage LLC joint venture (“VRS”) in a step acquisition. We recorded a gain of $26,923 as a result of re-measuring to fair value our existing equity interest.

On September 16, 2016, we acquired 23 stores from our ESS PRISA II LLC joint venture ("PRISA II") in a step acquisition. We recorded a gain of $6,662 as a result of re-measuring to fair value our existing equity interest. We then sold our remaining interest in PRISA II to Prudential for $34,758 in cash. As a result of this sale, we recognized a gain of $30,846.

There were no such gains during the three and nine months ended September 30, 2017.

Income Tax Expense—For the three and nine months ended September 30, 2017, the decrease in income tax expense was primarily the result of solar tax credits received during the quarter when compared to the same period in the prior year.

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Net Income Allocated to Noncontrolling Interests

The following table presents information on net income allocated to noncontrolling interests for the periods indicated:

	For the Three Months Ended September 30,										For the Nine Months Ended September 30,
	2017			2016			$ Change		% Change		2017			2016			$ Change			% Change
Net income allocated to noncontrolling interests:
Net income allocated to Preferred Operating Partnership noncontrolling interests	$	(3,394	)	$	(4,144	)	$	750	(18.1	)%	$	(10,775	)	$	(10,758	)	$	(17	)	0.2	%
Net income allocated to Operating Partnership and other noncontrolling interests	(3,917		)	(4,994		)	1,077		(21.6	)%	(11,080		)	(12,191		)	1,111			(9.1	)%
Total income allocated to noncontrolling interests:	$	(7,311	)	$	(9,138	)	$	1,827	(20.0	)%	$	(21,855	)	$	(22,949	)	$	1,094		(4.8	)%

Net Income Allocated to Preferred Operating Partnership Noncontrolling Interests—Income allocated to the Preferred Operating Partnership noncontrolling interests for the three and nine months ended September 30, 2017 and 2016 represents the fixed distributions paid to holders of the Series A Units, Series B Units, Series C Units and Series D Units, plus approximately 0.6% of the remaining net income allocated to holders of the Series A Units.

Net Income Allocated to Operating Partnership and Other Noncontrolling Interests—Income allocated to the Operating Partnership represents approximately 4.0% of net income after the allocation of the fixed distribution paid to the Preferred Operating Partnership unit holders for each of the three and nine months ended September 30, 2017 and 2016.

FUNDS FROM OPERATIONS

Funds from Operations (“FFO”) provides relevant and meaningful information about our operating performance that is necessary, along with net income and cash flows, for an understanding of our operating results. We believe FFO is a meaningful disclosure as a supplement to net earnings. Net earnings assume that the values of real estate assets diminish predictably over time as reflected through depreciation and amortization expenses. The values of real estate assets fluctuate due to market conditions and we believe FFO more accurately reflects the value of our real estate assets. FFO is defined by the National Association of Real Estate Investment Trusts, Inc. (“NAREIT”) as net income computed in accordance with GAAP, excluding gains or losses on sales of operating stores and impairment write downs of depreciable real estate assets, plus depreciation and amortization and after adjustments to record unconsolidated partnerships and joint ventures on the same basis. We believe that to further understand our performance, FFO should be considered along with the reported net income and cash flows in accordance with GAAP, as presented in our condensed consolidated financial statements. FFO should not be considered a replacement of net income computed in accordance with GAAP.

The computation of FFO may not be comparable to FFO reported by other REITs or real estate companies that do not define the term in accordance with the current NAREIT definition or that interpret the current NAREIT definition differently. FFO does not represent cash generated from operating activities determined in accordance with GAAP, and should not be considered as an alternative to net income as an indication of our performance, as an alternative to net cash flow from operating activities, as a measure of liquidity, or an indicator of our ability to make cash distributions.

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The following table presents the calculation of FFO for the periods indicated:

	For the Three Months Ended September 30,						For the Nine Months Ended September 30,
	2017			2016			2017			2016
Net income attributable to common stockholders	$	93,764		$	118,088		$	263,052		$	283,724
Adjustments:
Real estate depreciation	43,303			39,971			127,729			113,795
Amortization of intangibles	2,316			4,853			11,164			14,425
Loss (gain) on real estate transactions, earnout from prior acquisition and impairment of real estate	—			—			6,019			(9,814		)
Unconsolidated joint venture real estate depreciation and amortization	1,429			1,227			4,267			3,481
Unconsolidated joint venture gain on sale of real estate and purchase of partner's interest	—			(37,509		)	—			(64,432		)
Distributions paid on Series A Preferred Operating Partnership units	(572		)	(1,272		)	(2,547		)	(3,814		)
Income allocated to Operating Partnership noncontrolling interests	7,363			9,137			21,928			22,949
Funds from operations attributable to common stockholders and unit holders	$	147,603		$	134,495		$	431,612		$	360,314

SAME-STORE RESULTS

Our same-store pool for the periods presented consists of 732 stores that are wholly-owned and operated and that were stabilized by the first day of the earliest calendar year presented. We consider a store to be stabilized once it has been open for three years or has sustained average square foot occupancy of 80% or more for one calendar year. We believe that by providing same-store results from a stabilized pool of stores, with accompanying operating metrics including, but not limited to: occupancy, rental revenue growth, operating expense growth, net operating income growth, etc., stockholders and potential investors are able to evaluate operating performance without the effects of non-stabilized occupancy levels, rent levels, expense levels, acquisitions or completed developments.  Same-store results should not be used as a basis for future same-store performance or for the performance of our stores as a whole. The following table presents operating data for our same-store portfolio.

	For the Three Months Ended September 30,						Percent		For the Nine Months Ended September 30,						Percent
	2017			2016			Change		2017			2016			Change
Same-store rental revenues	$	220,123		$	210,075		4.8	%	$	640,322		$	608,462		5.2	%
Same-store operating expenses	59,183			57,507			2.9	%	174,661			174,820			(0.1	)%
Same-store net operating income	$	160,940		$	152,568		5.5	%	$	465,661		$	433,642		7.4	%
Same-store square foot occupancy as of quarter end	93.9		%	92.5		%			93.9		%	92.5		%
Properties included in same-store	732			732					732			732

Same-store revenues for the three and nine months ended September 30, 2017 increased due to gains in occupancy and higher rental rates for both new and existing customers. Expenses were higher for the three months ended September 30, 2017 due to increases in property taxes, and payroll and benefits which were partially offset by decreases in repairs and maintenance and insurance. Expenses for the nine months ended September 30, 2017 were generally flat with increases in property taxes and marketing expense offset by decreases in repairs and maintenance and insurance.

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The following table presents a reconciliation of same-store net operating income to net income as presented on our condensed consolidated statements of operations for the periods indicated:

	For the Three Months Ended September 30,						For the Nine Months Ended September 30,
	2017			2016			2017			2016
Net income	$	101,075		$	127,226		$	284,907		$	306,673
Adjusted to exclude:
Loss (gain) on real estate transactions, earnout from prior acquisition and impairment of real estate	—			—			6,019			(9,814		)
Equity in earnings of unconsolidated real estate joint ventures	(3,990		)	(3,625		)	(11,407		)	(9,813		)
Equity in earnings of unconsolidated real estate ventures - gain on sale of real estate assets and purchase of joint venture partners interests	—			(37,509		)	—			(64,432		)
Acquisition related costs and other1	—			1,933			—			9,124
Interest expense	41,034			34,737			117,019			101,371
Depreciation and amortization	48,075			46,555			144,139			133,402
Income tax expense	3,163			4,466			9,154			11,004
General and administrative (includes stock compensation)	19,498			19,537			60,171			63,451
Management fees, other income and interest income	(11,086		)	(12,576		)	(34,440		)	(38,528		)
Net tenant reinsurance	(19,610		)	(18,634		)	(59,054		)	(52,591		)
Non same-store revenue	(28,466		)	(14,376		)	(80,556		)	(27,268		)
Non same-store expenses	11,247			4,834			29,709			11,063
Total same-store NOI	$	160,940		$	152,568		$	465,661		$	433,642
Same-store rental revenues	$	220,123		$	210,075		$	640,322		$	608,462
Same-store operating expenses	59,183			57,507			174,661			174,820
Total same-store NOI	$	160,940		$	152,568		$	465,661		$	433,642

(1) Beginning January 1, 2017, acquisition related costs have been capitalized due to a change in accounting literature.

CASH FLOWS

Cash flows provided by operating activities were $449,629 and $386,159, respectively, for the nine months ended September 30, 2017 and 2016. The increase was due to a non-cash gain on the purchase of joint venture partners’ interests of $64,432 recorded during the nine months ended September 30, 2016. This gain was related to the two step acquisitions of stores that were previously owned by our VRS and PRISA II joint ventures and the sale of our remaining interest in PRISA II. Additionally, there was a non-cash loss taken related to real estate and land impairments of $6,019 during the nine months ended September 30, 2017. There was also an increase in depreciation and amortization expense of $10,737 when compared with the same period in the prior year.

Cash used in investing activities was $87,744 and $704,310, respectively, for the nine months ended September 30, 2017 and 2016. The decrease was primarily due to a decrease in cash paid for the acquisition of real estate assets of $644,206. We purchased nine stores during the nine months ended September 30, 2017, compared to 72 stores purchased during the nine months ended September 30, 2016.

Cash used in financing activities was $342,011 for the nine months ended September 30, 2017, compared to cash provided by financing activities of $261,044 for the nine months ended September 30, 2016. The change related primarily to an increase in principal payments on notes payable and revolving lines of credit of $454,603 as well as in increase in the dividend paid of $25,124 for the nine months ended September 30, 2017 when compared to the same period in the prior year. For the nine months ended September 30, 2016 we received net proceeds from the sale of common stock of $123,423 and no similar proceeds were received during the nine months ended September 30, 2017.

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LIQUIDITY AND CAPITAL RESOURCES

As of September 30, 2017, we had $63,732 available in cash and cash equivalents. We are required to distribute at least 90% of our net taxable income, excluding net capital gains, to our stockholders on an annual basis to maintain our qualification as a REIT.

Our cash and cash equivalents are held in accounts managed by third party financial institutions and consist of invested cash and cash in our operating accounts. During 2016 and the first nine months of 2017, we experienced no loss or lack of access to our cash or cash equivalents; however, there can be no assurance that access to our cash and cash equivalents will not be impacted by adverse conditions in the financial markets.

The following table presents information on our lines of credit for the period presented. All of our lines of credit are guaranteed by us.

	As of September 30, 2017
Revolving Lines of Credit	Amount Drawn		Capacity		Interest Rate		Origination Date	Maturity	Basis Rate (1)
Credit Line 1 (2)	$	25,000	$	100,000	2.9	%	6/4/2010	6/30/2018	LIBOR plus 1.7%
Credit Line 2 (3)(4)	—		500,000		2.6	%	10/14/2016	10/14/2020	LIBOR plus 1.4%
	$	25,000	$	600,000

⁽¹⁾  30-day USD LIBOR

⁽²⁾  Secured by mortgages on certain real estate assets. One two-year extension available.

⁽³⁾  Unsecured. Two six-month extensions available.

⁽⁴⁾  Basis rate as of September 30, 2017. Rate is subject to change based on a quarterly assessment of our consolidated leverage ratio.

As of September 30, 2017, we had $4,362,400 face value of debt, resulting in a debt to total enterprise value ratio of 28.9%. As of September 30, 2017, the ratio of total fixed-rate debt and other instruments to total debt was 80.8% (including $2,382,873 on which we have interest rate swaps that have been included as fixed-rate debt). The weighted average interest rate of the total of fixed- and variable-rate debt at September 30, 2017 was 3.3%. Certain of our real estate assets are pledged as collateral for our debt. We are subject to certain restrictive covenants relating to our outstanding debt. We were in compliance with all financial covenants at September 30, 2017.

We expect to fund our short-term liquidity requirements, including operating expenses, recurring capital expenditures, dividends to stockholders, distributions to holders of Operating Partnership units and interest on our outstanding indebtedness, out of our operating cash flow, cash on hand and borrowings under our revolving lines of credit, including undrawn portions of our unsecured facility. In addition, we are pursuing additional sources of financing based on anticipated funding needs.

On June 29, 2017 the Company's Operating Partnership entered an agreement for the private placement of $300 million of

10-year 3.95% senior notes. The notes were issued on August 24, 2017. The net proceeds have been used to refinance existing indebtedness and for general corporate purposes.

Our liquidity needs consist primarily of cash distributions to stockholders, store acquisitions, principal payments under our borrowings and non-recurring capital expenditures. We may from time to time seek to repurchase our outstanding debt, shares of common stock or other securities in open market purchases, privately negotiated transactions or otherwise. Such repurchases, if any, will depend on prevailing market conditions, our liquidity requirements, contractual restrictions and other factors. In addition, we evaluate, on an ongoing basis, the merits of strategic acquisitions and other relationships, which may require us to raise additional funds. We do not expect that our operating cash flow or cash balances will be sufficient to fund our liquidity needs and instead expect to fund such needs out of additional borrowings of secured or unsecured indebtedness, joint ventures with third parties, and from the proceeds of public and private offerings of equity and debt. Additional capital may not be available on terms favorable to us or at all. Any additional issuance of equity or equity-linked securities may result in dilution to our stockholders. In addition, any new securities we issue could have rights, preferences and privileges senior to holders of our

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common stock. We may also use Operating Partnership units as currency to fund acquisitions from self-storage owners who desire tax-deferral in their exiting transactions.

OFF-BALANCE SHEET ARRANGEMENTS

Except as disclosed in the notes to our consolidated financial statements of our most recently filed Annual Report on

Form 10-K, we do not currently have any relationships with unconsolidated entities or financial partnerships, such as entities often referred to as structured finance or special purposes entities, which typically are established for the purpose of facilitating off-balance sheet arrangements or other contractually narrow or limited purposes. Further, except as disclosed in the notes to our condensed consolidated financial statements, we have not guaranteed any obligations of unconsolidated entities, nor do we have any commitments or intent to provide funding to any such entities. Accordingly, we are not materially exposed to any financing, liquidity, market or credit risk that could arise if we had engaged in these relationships.

FINANCING STRATEGY

We will continue to employ leverage in our capital structure in amounts reviewed from time to time by our board of directors. Although our board of directors has not adopted a policy that limits the total amount of indebtedness that we may incur, we will consider a number of factors in evaluating our level of indebtedness from time to time, as well as the amount of such indebtedness that will be either fixed- or variable-rate. In making financing decisions, we will consider factors including but not limited to:

• the interest rate of the proposed financing;

• the extent to which the financing impacts flexibility in managing our stores;

• prepayment penalties and restrictions on refinancing;

• the purchase price of stores acquired with debt financing;

• long-term objectives with respect to the financing;

• target investment returns;

• the ability of particular stores, and our company as a whole, to generate cash flow sufficient to cover expected debt service payments;

• overall level of consolidated indebtedness;

• timing of debt and lease maturities;

• provisions that require recourse and cross-collateralization;

• corporate credit ratios including debt service coverage, debt to total capitalization and debt to undepreciated assets; and

• the overall ratio of fixed- and variable-rate debt.

Our indebtedness may be recourse, non-recourse or cross-collateralized. If the indebtedness is non-recourse, the collateral will be limited to the particular stores to which the indebtedness relates. In addition, we may invest in stores subject to existing loans collateralized by mortgages or similar liens on our stores, or we may refinance stores acquired on a leveraged basis. We may use the proceeds from any borrowings to refinance existing indebtedness, to refinance investments, including the redevelopment of existing stores, for general working capital or to purchase additional interests in partnerships or joint ventures or for other purposes when we believe it is advisable.

Typically, we invest in or form consolidated special purpose entities to assist us in obtaining secured permanent financing at attractive terms. Permanent financing may be structured as a mortgage loan on a single property, or on a group of properties, and generally requires us to provide a mortgage lien on the store or stores in favor of an institutional third party, as a joint venture with a third party, or as a securitized financing. For securitized financings, we create special purpose entities to own the stores. These special purpose entities, which are common in the real estate industry, are structured so that they would not be consolidated in a bankruptcy proceeding involving a parent company. We decide upon the structure of the financing based upon the best terms then available to us and whether the proposed financing is consistent with our other business objectives. For accounting purposes, we include the outstanding securitized debt of special purpose entities owning consolidated stores as part of our consolidated indebtedness.

42

We may from time to time seek to retire or repurchase our outstanding debt, as well as shares of common stock or other securities in open market purchases, privately negotiated transactions or otherwise. Such repurchases, if any, will depend on prevailing market conditions, our liquidity requirements, contractual restrictions and other factors. The amounts involved may be material.

SEASONALITY

The self-storage business is subject to seasonal fluctuations. A greater portion of revenues and profits are realized from May through September. Historically, our highest level of occupancy has been at the end of July, while our lowest level of occupancy has been in late February and early March. Results for any quarter may not be indicative of the results that may be achieved for the full fiscal year.

ITEM 3. QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK

Amounts in thousands, except store and share data, unless otherwise stated

Market Risk

Market risk refers to the risk of loss from adverse changes in market prices and interest rates. Our future income, cash flows and fair values of financial instruments are dependent upon prevailing market interest rates.

Interest Rate Risk

Interest rate risk is highly sensitive to many factors, including governmental monetary and tax policies, domestic and international economic and political considerations and other factors beyond our control.

As of September 30, 2017, we had $4,362,400 in total face value of debt, of which $837,194 was subject to variable interest rates (excluding debt with interest rate swaps). If LIBOR were to increase or decrease by 100 basis points, the increase or decrease in interest expense on the variable-rate debt would increase or decrease future earnings and cash flows by $8,372 annually.

Interest rate risk amounts were determined by considering the impact of hypothetical interest rates on our financial instruments. These analyses do not consider the effect of any change in overall economic activity that could occur. Further, in the event of a change of that magnitude, we may take actions to further mitigate our exposure to the change. However, due to the uncertainty of the specific actions that would be taken and their possible effects, these analyses assume no changes in our financial structure.

The fair values of our fixed-rate assets and liabilities were as follows for the periods indicated:

	September 30, 2017				December 31, 2016
	Fair Value		Carrying Value		Fair Value		Carrying Value
Notes receivable from Preferred Operating Partnership unit holders	$	114,506	$	120,230	$	125,642	$	120,230
Fixed rate notes receivable	$	21,285	$	20,608	$	53,450	$	52,201
Fixed rate notes payable and notes payable to trusts	$	2,882,709	$	2,900,822	$	2,404,996	$	2,417,558
Exchangeable senior notes	$	702,118	$	624,384	$	706,827	$	638,170

The fair value of our note receivable from Preferred Operating Partnership unit holders and other notes receivable was based on the discounted estimated future cash flows of the note (categorized within Level 3 of the fair value hierarchy); the discount rate used approximated the current market rate for loans with similar maturities and credit quality. The fair values of our fixed-rate notes payable and notes payable to trusts were estimated using the discounted estimated future cash payments to be made on such debt (categorized within Level 3 of the fair value hierarchy); the discount rates used approximated current market rates for loans, or groups of loans, with similar maturities and credit quality. The fair value of our exchangeable senior notes was estimated using an average market price for similar securities obtained from a third party.

43

ITEM 4. CONTROLS AND PROCEDURES

(1) Disclosure Controls and Procedures

We maintain disclosure controls and procedures to ensure that information required to be disclosed in the reports we file pursuant to the Securities Exchange Act of 1934, as amended, or the Exchange Act, are recorded, processed, summarized and reported within the time periods specified in the rules and forms of the Securities and Exchange Commission, and that such information is accumulated and communicated to our management, including our Chief Executive Officer and Chief Financial Officer, as appropriate, to allow timely decisions regarding required disclosure based on the definition of “disclosure controls and procedures” in Rule 13a-15(e) of the Exchange Act. In designing and evaluating the disclosure controls and procedures, management recognized that any controls and procedures, no matter how well designed and operated, can only provide a reasonable assurance of achieving the desired control objectives, and in reaching a reasonable level of assurance, management necessarily was required to apply its judgment in evaluating the cost-benefit relationship of possible controls and procedures.

We have a disclosure committee that is responsible for considering the materiality of information and determining our disclosure obligations a timely basis. The disclosure committee meets quarterly and reports directly to our Chief Executive Officer and Chief Financial Officer.

We carried out an evaluation, under the supervision and with the participation of management, including our Chief Executive Officer and the Chief Financial Officer, of the effectiveness of the design and operation of our disclosure controls and procedures as of the end of the period covered by this report. Based upon that evaluation, our Chief Executive Officer and Chief Financial Officer concluded that our disclosure controls and procedures were effective at the reasonable assurance level as of the end of the period covered by this report.

(2) Changes in internal control over financial reporting

There were no changes in our internal control over financial reporting (as such term is defined in Exchange Act Rule 13a-15(f)) that occurred during our most recent quarter that have materially affected, or are reasonably likely to materially affect, our internal control over financial reporting.

44

PART II. OTHER INFORMATION

ITEM 1. LEGAL PROCEEDINGS

We are involved in various legal proceedings and are subject to various claims and complaints arising in the ordinary course of business. Because litigation is inherently unpredictable, the outcome of these matters cannot presently be determined with any degree of certainty. In accordance with applicable accounting guidance, management establishes an accrued liability for litigation when those matters present loss contingencies that are both probable and reasonably estimable. In such cases, there may be an exposure to loss in excess of any amounts accrued. The estimated loss, if any, is based upon currently available information and is subject to significant judgment, a variety of assumptions, and known and unknown uncertainties. We could in the future incur judgments or enter into settlements of claims that could have a material adverse effect on our results of operations in any particular period, notwithstanding the fact that we are currently vigorously defending any legal proceedings against us.

ITEM 1A. RISK FACTORS

In addition to the other information set forth in this report, you should carefully consider the factors discussed in “Part I. Item 1A. Risk Factors” in our Annual Report on Form 10-K for the year ended December 31, 2016, which could materially affect our business, financial condition and results of operations. There have been no material changes to the risk factors described in the “Risk Factors” section in our Annual Report on Form 10-K for the year ended December 31, 2016. The risks described in our Annual Report on Form 10-K are not the only risks facing our company. Additional risks and uncertainties not currently known to us or that we currently deem to be immaterial may also materially adversely affect our business, financial condition and results of operations.

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

On August 4, 2017, our Operating Partnership issued 25,520 common OP Units in connection with the acquisition of one store in Florida. The store was acquired in exchange for the OP Units, valued at $2.0 million and approximately $7.1 million of cash.

The terms of the common OP Units are governed by the Operating Partnership's Fourth Amended and Restated Agreement of Limited Partnership. The common OP Units will be redeemable at the option of the holders on the first anniversary of the date of issuance, which redemption obligation may be satisfied, at our option, in cash or shares of our common stock.

The common OP Units were issued to accredited investors in private placements in reliance on Section 4(a)(2) of the Securities Act of 1933, as amended, and the rules and regulations promulgated thereunder.

ITEM 3. DEFAULTS UPON SENIOR SECURITIES

None.

ITEM 4. MINE SAFETY DISCLOSURES

Not Applicable.

ITEM 5. OTHER INFORMATION

None.

45

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 Certifications of the Chief Executive Officer and Chief Financial Officer pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002.

101 The following materials from Extra Space Storage Inc.’s Quarterly Report on Form 10-Q for the quarter ended September 30, 2017, are formatted in XBRL (eXtensible Business Reporting Language): (1) the Condensed Consolidated Balance Sheets, (2) the Condensed Consolidated Statements of Operations, (3) the Condensed Consolidated Statements of Comprehensive Income (4) the Condensed Consolidated Statement of Noncontrolling Interests and Equity, (5) the Condensed Consolidated Statements of Cash Flows and (6) notes to these financial statements.

46

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, as amended, the registrant has duly caused this report to be signed on its behalf by the undersigned thereunto duly authorized.

	EXTRA SPACE STORAGE INC.
	Registrant
Date: November 3, 2017	/s/ Joseph D. Margolis
	Joseph D. Margolis
	Chief Executive Officer (Principal Executive Officer)
Date: November 3, 2017	/s/ P. Scott Stubbs
	P. Scott Stubbs
	Executive Vice President and Chief Financial Officer
	(Principal Financial Officer)

47

EX-31.1

Exhibit 31.1

CERTIFICATION

I, Joseph D. Margolis, certify that:

1. I have reviewed this quarterly report on Form 10-Q of Extra Space Storage Inc.;

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.

Date: November 3, 2017	By:	/s/ Joseph D. Margolis
	Name:	Joseph D. Margolis
	Title:	Chief Executive Officer

EX-31.2

Exhibit 31.2

CERTIFICATION

I, P. Scott Stubbs, certify that:

1. I have reviewed this quarterly report on Form 10-Q of Extra Space Storage Inc.;

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.

Date: November 3, 2017	By:	/s/ P. Scott Stubbs
	Name:	P. Scott Stubbs
	Title:	Executive Vice President and Chief Financial Officer

EX-32.1

Exhibit 32.1

Certification of Chief Executive Officer and Chief Financial Officer

Pursuant to

18 U.S.C. Section 1350,

as adopted pursuant to

Section 906 of the Sarbanes-Oxley Act of 2002

The undersigned, the Chief Executive Officer of Extra Space Storage Inc. (the “Company”), hereby certifies to his knowledge on the date hereof, pursuant to 18 U.S.C. 1350(a), as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that the Quarterly Report on Form 10-Q for the quarter ended September 30, 2017 (the “Form 10-Q”), filed concurrently herewith by the Company, fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934, as amended, and that the information contained in the Form 10-Q fairly presents, in all material respects, the financial condition and results of operations of the Company.

By:	/s/ Joseph D. Margolis
Name:	Joseph D. Margolis
Title:	Chief Executive Officer
Date:	November 3, 2017

The undersigned, the Chief Financial Officer of Extra Space Storage Inc. (the “Company”), hereby certifies to his knowledge on the date hereof, pursuant to 18 U.S.C. 1350(a), as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that the Quarterly Report on Form 10-Q for the quarter ended September 30, 2017 (the “Form 10-Q”), filed concurrently herewith by the Company, fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934, as amended, and that the information contained in the Form 10-Q fairly presents, in all material respects, the financial condition and results of operations of the Company.

By:	/s/ P. Scott Stubbs
Name:	P. Scott Stubbs
Title:	Executive Vice President and Chief Financial Officer
Date:	November 3, 2017

XML

Document and Entity Information - shares	9 Months Ended
	Sep. 30, 2017	Oct. 31, 2017
Document And Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Sep. 30, 2017
Document Fiscal Year Focus	2017
Document Fiscal Period Focus	Q3
Trading Symbol	EXR
Entity Registrant Name	Extra Space Storage Inc.
Entity Central Index Key	0001289490
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		126,007,803

XML

Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Assets:
Real estate assets, net	$ 6,770,086	$ 6,770,447
Investments in unconsolidated real estate ventures	78,512	79,570
Cash and cash equivalents	63,732	43,858
Restricted cash	17,277	13,884
Receivables from related parties and affiliated real estate joint ventures	4,618	16,611
Other assets, net	152,730	167,076
Total assets	7,086,955	7,091,446
Liabilities, Noncontrolling Interests and Equity:
Notes payable, net	3,568,113	3,213,588
Exchangeable senior notes, net	602,485	610,314
Notes payable to trusts, net	117,414	117,321
Revolving lines of credit	25,000	365,000
Accounts payable and accrued expenses	114,247	101,388
Other liabilities	85,971	87,669
Total liabilities	4,513,230	4,495,280
Commitments and contingencies
Extra Space Storage Inc. stockholders' equity:
Preferred stock, $0.01 par value, 50,000,000 shares authorized, no shares issued or outstanding	0	0
Common stock, $0.01 par value, 500,000,000 shares authorized, 126,007,207 and 125,881,460 shares issued and outstanding at September 30, 2017 and December 31, 2016, respectively	1,260	1,259
Additional paid-in capital	2,567,234	2,566,120
Accumulated other comprehensive income	17,731	16,770
Accumulated deficit	(370,959)	(339,257)
Total Extra Space Storage Inc. stockholders' equity	2,215,266	2,244,892
Noncontrolling interest represented by Preferred Operating Partnership units, net of $120,230 notes receivable	154,432	147,920
Noncontrolling interests in Operating Partnership	202,232	203,354
Other noncontrolling interests	1,795	0
Total noncontrolling interests and equity	2,573,725	2,596,166
Total liabilities, noncontrolling interests and equity	$ 7,086,955	$ 7,091,446

XML

Condensed Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Statement of Financial Position [Abstract]
Preferred stock, par value (in dollars per share)	$ 0.01	$ 0.01
Preferred stock, shares authorized	50,000,000	50,000,000
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized	500,000,000	500,000,000
Common stock, shares issued	126,007,207	125,881,460
Common stock, shares outstanding	126,007,207	125,881,460
Note receivable from noncontrolling interest represented by Preferred Operating Partnership units	$ 120,230	$ 120,230

XML

Condensed Consolidated Statements of Operations - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Revenues:
Property rental	$ 248,589	$ 224,451	$ 720,878	$ 635,730
Tenant reinsurance	25,882	22,727	73,050	64,936
Management fees and other income	9,685	10,005	29,239	30,193
Total revenues	284,156	257,183	823,167	730,859
Expenses:
Property operations	70,430	62,341	204,370	185,883
Tenant reinsurance	6,272	4,093	13,996	12,345
Acquisition related costs and other	0	1,933	0	9,124
General and administrative	19,498	19,537	60,171	63,451
Depreciation and amortization	48,075	46,555	144,139	133,402
Total expenses	144,275	134,459	422,676	404,205
Income from operations	139,881	122,724	400,491	326,654
Gain (loss) on real estate transactions, earnout from prior acquisition and impairment of real estate	0	0	(6,019)	9,814
Interest expense	(39,766)	(33,494)	(113,192)	(97,655)
Non-cash interest expense related to amortization of discount on equity component of exchangeable senior notes	(1,268)	(1,243)	(3,827)	(3,716)
Interest income	869	1,358	2,797	4,697
Interest income on note receivable from Preferred Operating Partnership unit holder	532	1,213	2,404	3,638
Income before equity in earnings of unconsolidated real estate ventures and income tax expense	100,248	90,558	282,654	243,432
Equity in earnings of unconsolidated real estate ventures	3,990	3,625	11,407	9,813
Equity in earnings of unconsolidated real estate ventures - gain on sale of real estate assets and purchase of joint venture partners' interests	0	37,509	0	64,432
Income tax expense	(3,163)	(4,466)	(9,154)	(11,004)
Net income	101,075	127,226	284,907	306,673
Net income allocated to Preferred Operating Partnership noncontrolling interests	(3,394)	(4,144)	(10,775)	(10,758)
Net income allocated to Operating Partnership and other noncontrolling interests	(3,917)	(4,994)	(11,080)	(12,191)
Net income attributable to common stockholders	$ 93,764	$ 118,088	$ 263,052	$ 283,724
Earnings per common share
Basic (in dollars per share)	$ 0.74	$ 0.94	$ 2.09	$ 2.26
Diluted (in dollars per share)	$ 0.74	$ 0.93	$ 2.07	$ 2.24
Weighted average number of shares
Basic (in shares)	125,717,517	125,752,291	125,665,787	125,244,761
Diluted (in shares)	133,044,473	133,763,472	133,008,622	132,476,691
Cash dividends paid per common share (in dollars per share)	$ 0.78	$ 0.78	$ 2.34	$ 2.15

XML

Condensed Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Statement of Comprehensive Income [Abstract]
Net income	$ 101,075	$ 127,226	$ 284,907	$ 306,673
Other comprehensive income (loss):
Change in fair value of interest rate swaps	759	13,374	992	(36,571)
Total comprehensive income	101,834	140,600	285,899	270,102
Less: comprehensive income attributable to noncontrolling interests	7,342	9,761	21,886	21,120
Comprehensive income attributable to common stockholders	$ 94,492	$ 130,839	$ 264,013	$ 248,982

XML

Condensed Consolidated Statement of Noncontrolling Interests and Equity - 9 months ended Sep. 30, 2017 - USD ($) $ in Thousands	Total	Series A Preferred Operating Partnership [Member]	Series B Preferred Operating Partnership [Member]	Series C Preferred Operating Partnership [Member]	Series D Preferred Operating Partnership [Member]	Common Operating Partnership [Member]	Other [Member]	Par Value [Member]	Additional Paid-in Capital [Member]	Accumulated Other Comprehensive Loss [Member]	Accumulated Deficit [Member]	Preferred Partner [Member] Series D Preferred Stock [Member] Series D Preferred Operating Partnership [Member]
Balance, beginning of period at Dec. 31, 2016	$ 2,596,166	$ 14,385	$ 41,902	$ 10,730	$ 80,903	$ 203,354	$ 0	$ 1,259	$ 2,566,120	$ 16,770	$ (339,257)
Balance, beginning of period (in shares) at Dec. 31, 2016	125,881,460							125,881,460
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock upon the exercise of options (in shares)								38,418
Issuance of common stock upon the exercise of options	$ 1,266								1,266
Restricted stock grants issued (in shares)								93,796
Restricted stock grants issued	$ 0							$ 1	(1)
Restricted stock grants canceled (in shares)	0							(6,467)
Compensation expense related to stock-based awards	$ 7,244								7,244
Redemption of Operating Partnership units for cash	(2,510)					(1,238)			(1,272)
Issuance of Preferred D Units in the Operating Partnership in conjunction with acquisitions						2,000						$ 6,810
Noncontrolling Interest in consolidated joint venture	1,868						1,868
Repurchase of equity portion of 2013 exchangeable senior notes	(6,123)								(6,123)
Net income (loss)	284,907	4,294	1,886	2,028	2,567	11,153	(73)				263,052
Other comprehensive income	992	4				27				961
Distributions to Operating Partnership units held by noncontrolling interests	(24,141)	(4,596)	(1,886)	(2,028)	(2,567)	(13,064)
Dividends paid on common stock at $2.34 per share	(294,754)										(294,754)
Balance, end of period at Sep. 30, 2017	$ 2,573,725	$ 14,087	$ 41,902	$ 10,730	$ 87,713	$ 202,232	$ 1,795	$ 1,260	$ 2,567,234	$ 17,731	$ (370,959)
Balance, end of period (in shares) at Sep. 30, 2017	126,007,207							126,007,207,000

XML

Condensed Consolidated Statement of Noncontrolling Interests and Equity (Parenthetical) - $ / shares	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Statement of Stockholders' Equity [Abstract]
Dividends paid on common stock, per share (in dollars per share)	$ 0.78	$ 0.78	$ 2.34	$ 2.15

XML

Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
Cash flows from operating activities:
Net income	$ 284,907	$ 306,673
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	144,139	133,402
Amortization of deferred financing costs	9,246	9,388
Non-cash interest expense related to amortization of discount on equity component of exchangeable senior notes	3,827	3,716
Non-cash interest expense related to amortization of premium on notes payable	0	(828)
Compensation expense related to stock-based awards	7,244	6,008
Gain on sale of real estate assets and purchase of joint venture partner's interest	0	(64,432)
(Gain) loss on real estate transactions, earnout from prior acquisition and impairment of real estate	6,019	(9,814)
Distributions from unconsolidated real estate ventures in excess of earnings	3,498	3,071
Changes in operating assets and liabilities:
Receivables from related parties and affiliated real estate joint ventures	195	923
Other assets	(15,498)	(16,059)
Accounts payable and accrued expenses	6,425	10,938
Other liabilities	(373)	3,173
Net cash provided by operating activities	449,629	386,159
Cash flows from investing activities:
Acquisition of real estate assets	(119,040)	(763,246)
Development and redevelopment of real estate assets	(20,670)	(18,492)
Proceeds from sale of real estate assets, investments in real estate ventures and other assets	18,565	56,786
Change in restricted cash	(3,393)	14,296
Investment in unconsolidated real estate ventures	(3,021)	(25,690)
Return of investment in unconsolidated real estate ventures	581	11,991
Purchase/issuance of notes receivable	0	(18,530)
Principal payments received from notes receivable	44,869	41,393
Purchase of equipment and fixtures	(5,635)	(2,818)
Net cash used in investing activities	(87,744)	(704,310)
Cash flows from financing activities:
Proceeds from the sale of common stock, net of offering costs	0	123,423
Repurchase of exchangeable senior notes	(19,726)	(22,192)
Proceeds from notes payable and revolving lines of credit	1,023,170	1,026,975
Principal payments on notes payable and revolving lines of credit	(1,020,144)	(565,541)
Deferred financing costs	(5,172)	(6,700)
Net proceeds from exercise of stock options	1,266	312
Proceeds from termination of interest rate cap	0	1,650
Payment of earnout from prior acquisition	0	(4,600)
Redemption of Operating Partnership units held by noncontrolling interests	(2,510)	0
Dividends paid on common stock	(294,754)	(269,630)
Distributions to noncontrolling interests	(24,141)	(22,653)
Net cash provided by (used in) financing activities	(342,011)	261,044
Net increase in cash and cash equivalents	19,874	(57,107)
Cash and cash equivalents, beginning of the period	43,858	75,799
Cash and cash equivalents, end of the period	63,732	18,692
Supplemental schedule of cash flow information
Interest paid	107,144	94,585
Income taxes paid	8,086	10,813
Redemption of Operating Partnership units held by noncontrolling interests for common stock:
Noncontrolling interests in Operating Partnership	0	(839)
Common stock and paid-in capital	0	839
Tax effect from vesting of restricted stock grants and option exercises
Other assets	0	1,322
Additional paid-in capital	0	(1,322)
Accrued construction costs and capital expenditures
Acquisition of real estate assets	4,874	8,839
Development and redevelopment of real estate assets	1,558	0
Other liabilities	(6,432)	(8,839)
Distribution of real estate from investments in unconsolidated real estate ventures
Real estate assets, net	0	21,587
Investments in unconsolidated real estate ventures	0	(21,587)
Disposition of real estate assets
Real estate assets, net	0	(7,689)
Acquisitions Of Real Estate [Member]
Acquisitions of real estate assets
Real estate assets, net	20,100	65,960
Value of Operating Partnership units issued	(8,810)	(56,237)
Notes payable assumed	(9,463)	(9,723)
Other noncontrolling interests	(1,827)	0
Redemption Of Operating Partnership Units [Member]
Disposition of real estate assets
Operating Partnership units redeemed	0	7,689
Acquisition Of Other Noncontrolling Interests [Member]
Acquisition of noncontrolling interests
Operating Partnership units issued	0	(800)
Other noncontrolling interests	0	162
Additional paid-in capital	$ 0	$ 638

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Organization

9 Months Ended

Sep. 30, 2017

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Organization

ORGANIZATION

Extra Space Storage Inc. (the “Company”) is a fully-integrated, self-administered and self-managed real estate investment trust (“REIT”), formed as a Maryland corporation on April 30, 2004, to own, operate, manage, acquire, develop and redevelop professionally managed self-storage properties (“stores”) located throughout the United States. The Company continues the business of Extra Space Storage LLC and its subsidiaries, which had engaged in the self-storage business since 1977. The Company’s interests in its stores is held through its operating partnership, Extra Space Storage LP (the “Operating Partnership”), which was formed on May 5, 2004. The Company’s primary assets are general partner and limited partner interests in the Operating Partnership. This structure is commonly referred to as an umbrella partnership REIT, or UPREIT. The Company has elected to be taxed as a REIT under the Internal Revenue Code of 1986, as amended. To the extent the Company continues to qualify as a REIT, it will not be subject to tax, with certain limited exceptions, on the taxable income that is distributed to its stockholders.

The Company invests in stores by acquiring wholly-owned stores or by acquiring an equity interest in real estate entities. At September 30, 2017, the Company had direct and indirect equity interests in 1,028 stores. In addition, the Company managed 485 stores for third parties, bringing the total number of stores which it owns and/or manages to 1,513. These stores are located in 38 states, Washington, D.C. and Puerto Rico.

The Company operates in three distinct segments: (1) rental operations; (2) tenant reinsurance; and (3) property management, acquisition and development. The rental operations activities include rental operations of stores in which we have an ownership interest. No single tenant accounts for more than 5.0% of rental income. Tenant reinsurance activities include the reinsurance of risks relating to the loss of goods stored by tenants in the Company’s stores. The Company’s property management, acquisition and development activities include managing, acquiring and developing stores.

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Basis of Presentation

9 Months Ended

Sep. 30, 2017

Accounting Policies [Abstract]

Basis of Presentation

BASIS OF PRESENTATION

The accompanying unaudited condensed consolidated financial statements of the Company are presented on the accrual basis of accounting in accordance with U.S. generally accepted accounting principles (“GAAP”) for interim financial information, and in accordance with the instructions to Form 10-Q and Article 10 of Regulation S-X. Accordingly, they may not include all of the information and footnotes required by GAAP for complete financial statements. In the opinion of management, all adjustments (including normal recurring accruals) considered necessary for a fair presentation have been included. Operating results for the three and nine months ended September 30, 2017 are not necessarily indicative of results that may be expected for the year ending December 31, 2017. The condensed consolidated balance sheet as of December 31, 2016 has been derived from the Company’s audited financial statements as of that date, but does not include all of the information and footnotes required by GAAP for complete financial statements. For further information refer to the consolidated financial statements and footnotes thereto included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2016, as filed with the Securities and Exchange Commission.

Recently Issued Accounting Standards

In May 2014, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) 2014-09, “Revenue from Contracts with Customers,” which amends the guidance for revenue recognition to replace numerous, industry-specific requirements and converges areas under this topic with those of the International Financial Reporting Standards. ASU 2014-09 outlines a five-step process for customer contract revenue recognition that focuses on transfer of control, as opposed to transfer of risk and rewards. The amendment also requires enhanced disclosures regarding the nature, amount, timing and uncertainty of revenues and cash flows from contracts with customers. The new standard will become effective for annual and interim periods beginning after December 15, 2017 with early adoption permitted. The Company has determined that its property rental revenue and tenant reinsurance revenue will not be subject to the guidance in ASU 2014-09, as they qualify as lease contracts and insurance contracts, which are excluded from its scope. The Company's management fee revenue will be included in the scope of the standard. However, based on the Company's initial assessment, it appears that revenue recognized under the standard will not differ materially from revenue recognized under existing guidance. The Company continues to assess the potential impacts of ASU 2014-09. The Company anticipates adopting the standard using the modified retrospective transition method as of January 1, 2018.

In February 2016, the FASB issued ASU 2016-02, “Leases (Topic 842),” which modifies the accounting for leases, intending to increase transparency and comparability of organizations by requiring balance sheet presentation of leased assets and increased financial statement disclosure of leasing arrangements. ASU 2016-02 will require entities to recognize a liability for their lease obligations and a corresponding asset representing the right to use the underlying asset over the lease term. Lease obligations are to be measured at their present value and accounted for using the effective interest method. The accounting for the leased asset will differ slightly depending on whether the agreement is deemed to be a financing or operating lease. For financing leases, the leased asset is depreciated on a straight-line basis and depreciation expense is recorded separately from the interest expense in the statements of operations, resulting in higher expense in the earlier part of the lease term. For operating leases, the depreciation and interest expense components are combined, recognized evenly over the term of the lease, and presented as a reduction to operating income. ASU 2016-02 requires that assets and liabilities be presented or disclosed separately, and requires additional disclosure of certain qualitative and quantitative information related to these lease agreements. ASU 2016-02 is effective for annual and interim periods beginning after December 15, 2018. The Company is currently assessing the impact of the adoption of ASU 2016-02 on the Company’s consolidated financial statements.

In March 2016, the FASB issued ASU 2016-05, "Derivatives and Hedging (Topic 815): Effect of Derivative Contract Novations on Existing Hedge Accounting Relationships." ASU 2016-05 clarifies that a change in the counterparty to a derivative instrument that has been designated as a hedging instrument does not, in and of itself, require re-designation of that hedging relationship provided that all other hedge accounting criteria continue to be met. The Company adopted this guidance on January 1, 2017. The adoption of ASU 2016-05 did not have a material impact on the Company's consolidated financial statements.

In March 2016, the FASB issued ASU 2016-09, “Stock Compensation (Topic 718): Improvements to Employee Share-Based Payment Accounting.” ASU 2016-09 simplifies several aspects of the accounting for employee share-based payment transactions, including the income tax consequences, classification of awards as either equity or liabilities, and classification on the statement of cash flows. This ASU is effective for fiscal years beginning after December 15, 2016, including interim periods within those fiscal years. The Company adopted this guidance prospectively on January 1, 2017, and prior periods have not

been adjusted. As a result of the adoption of this guidance, the Company no longer presents the tax effects from vesting of restricted stock grants and stock option exercises on its condensed consolidated statement of noncontrolling interests and equity.

In August 2016, the FASB issued ASU 2016-15, "Statement of Cash Flows (Topic 230): Classification of Certain Cash Receipts and Cash Payments." ASU 2016-15 provides guidance on several specific cash flow issues, including the classification of debt prepayment or debt extinguishment costs, contingent consideration payments, and distributions received from equity method investees. This guidance is effective for fiscal years beginning after December 15, 2017. The Company is currently evaluating the new guidance to determine the impact it may have on its consolidated financial statements.

In October 2016, the FASB issued ASU 2016-18, "Statement of Cash Flows (Topic 230): Restricted Cash," which requires that a statement of cash flows explains the change during the period in the total of cash, cash equivalents, and amounts generally described as restricted cash or restricted cash equivalents. Therefore, amounts generally described as restricted cash and restricted cash equivalents should be included with cash and cash equivalents when reconciling the beginning-of-period and end-of-period total amounts shown on the statement of cash flows. This guidance is effective for fiscal years beginning after December 15, 2017, and interim periods within those fiscal years. Early adoption is permitted. The Company is currently evaluating the new guidance to determine the impact it may have on its consolidated financial statements.

In January 2017, the FASB issued ASU 2017-01, "Business Combinations (Topic 805): Clarifying the Definition of a Business," which provides guidance on whether transactions should be accounted for as acquisitions or disposals of assets or businesses. Specifically, when substantially all of the fair value of the gross assets acquired (or disposed of) is concentrated in a single identifiable asset or group of similar identifiable assets, the set of assets is not a business. Additionally, ASU 2017-01 also provides other guidance providing a more robust framework to use in determining whether a set of assets and activities is a

business. This guidance is effective for annual periods beginning after December 15, 2017. Early adoption is permitted for transactions for which the acquisition or disposition date occurs before the issuance date or effective date of the amendments, only when the transaction has not been reported in financial statements that have been issued. The Company adopted ASU 2017-01 for new acquisitions beginning on January 1, 2017. The costs related to the acquisitions of stores that qualify as asset acquisitions will be capitalized as part of the purchase.

In August 2017, the FASB issued ASU 2017-12, "Derivatives and Hedging (Topic 815): Targeted Improvements for Accounting for Hedging Activities," which amends and simplifies existing guidance for the financial reporting of hedging relationships to allow companies to better portray the economic effects of risk management activities in their financial statements. ASU 2017-12 is effective for annual periods beginning after December 15, 2018, with early adoption permitted. The Company is currently evaluating the new guidance to determine the impact it may have on its consolidated financial statements.

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Fair Value Disclosures

9 Months Ended

Sep. 30, 2017

Fair Value Disclosures [Abstract]

Fair Value Disclosures

FAIR VALUE DISCLOSURES

Derivative Financial Instruments

Currently, the Company uses interest rate swaps to manage its interest rate risk. The valuation of these instruments is determined using widely accepted valuation techniques, including discounted cash flow analysis on the expected cash flows of each derivative. This analysis reflects the contractual terms of the derivatives, including the period to maturity, and uses observable market-based inputs, including interest rate curves. The fair values of interest rate swaps are determined using the market standard methodology of netting the discounted future fixed cash payments and the discounted expected variable cash receipts. The variable cash receipts are based on an expectation of future interest rates (forward curves) derived from observable market interest rate forward curves.

The Company incorporates credit valuation adjustments to appropriately reflect both its own nonperformance risk and the respective counterparty’s nonperformance risk in the fair value measurements. In adjusting the fair value of its derivative contracts for the effect of nonperformance risk, the Company has considered the impact of netting and any applicable credit enhancements, such as collateral postings, thresholds, mutual puts and guarantees. In conjunction with the FASB’s fair value measurement guidance, the Company made an accounting policy election to measure the credit risk of its derivative financial instruments that are subject to master netting agreements on a net basis by counterparty portfolio.

Although the Company has determined that the majority of the inputs used to value its derivatives fall within Level 2 of the fair value hierarchy, the credit valuation adjustments associated with its derivatives utilize Level 3 inputs, such as estimates of current credit spreads to evaluate the likelihood of default by the Company and its counterparties. However, as of September 30, 2017, the Company had assessed the significance of the impact of the credit valuation adjustments on the overall valuation of its derivative positions and determined that the credit valuation adjustments were not significant to the overall valuation of its derivatives. As a result, the Company determined that its derivative valuations in their entirety were classified in Level 2 of the fair value hierarchy.

The table below presents the Company’s assets and liabilities measured at fair value on a recurring basis as of September 30, 2017, aggregated by the level in the fair value hierarchy within which those measurements fall. 

				Fair Value Measurements at Reporting Date Using
Description	September 30, 2017			Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)			Significant Unobservable Inputs (Level 3)
Other assets - Cash Flow Hedge Swap Agreements	$	23,584		$	—	$	23,584		$	—
Other liabilities - Cash Flow Hedge Swap Agreements	$	(1,430	)	$	—	$	(1,430	)	$	—

The Company did not have any significant assets or liabilities that are re-measured on a recurring basis using significant unobservable inputs as of September 30, 2017 or December 31, 2016.

Assets and Liabilities Measured at Fair Value on a Nonrecurring Basis

Long-lived assets held for use are evaluated for impairment when events or circumstances indicate there may be impairment. The Company reviews each store at least annually to determine if any such events or circumstances have occurred or exist. The Company focuses on stores where occupancy and/or rental income have decreased by a significant amount. For these stores, the Company determines whether the decrease is temporary or permanent, and whether the store will likely recover the lost occupancy and/or revenue in the short term. In addition, the Company carefully reviews stores in the lease-up stage and compares actual operating results to original projections.

When the Company determines that an event that may indicate impairment has occurred, the Company compares the carrying value of the related long-lived assets to the undiscounted future net operating cash flows attributable to the assets. An impairment loss is recorded if the net carrying value of the assets exceeds the undiscounted future net operating cash flows attributable to the assets. The impairment loss recognized equals the excess of net carrying value over the related fair value of the assets.

When real estate assets are identified by management as held for sale, the Company discontinues depreciating the assets and estimates the fair value of the assets, net of selling costs. If the estimated fair value, net of selling costs, of the assets that have been identified as held for sale is less than the net carrying value of the assets, the Company would recognize an impairment loss on the assets held for sale. The operations of assets held for sale or sold during the period are presented as part of normal operations for all periods presented. As of September 30, 2017, the Company had one parcel of undeveloped land and 36 operating stores classified as held for sale. The estimated fair value less selling costs of each of these operating stores is greater than the carrying value of the assets, and therefore no loss has been recorded related to the operating stores held for sale. For the nine months ended September 30, 2017, the Company recorded an impairment loss of $6,100 relating to one parcel of land held for sale and an additional two parcels of undeveloped land where the carrying value was greater than the fair value.

The Company assesses whether there are any indicators that the value of the Company’s investments in unconsolidated real estate ventures may be impaired annually and when events or circumstances indicate that there may be impairment. An investment is impaired if management’s estimate of the fair value of the investment is less than its carrying value. To the extent impairment has occurred, and is considered to be other than temporary, the loss is measured as the excess of the carrying amount of the investment over the fair value of the investment.

In connection with the Company’s acquisition of stores, the purchase price is allocated to the tangible and intangible assets and liabilities acquired based on their relative fair values, which are estimated using significant unobservable inputs. The value of the tangible assets, consisting of land and buildings, is determined as if vacant. Intangible assets, which represent the value of existing tenant relationships, are recorded at their fair values based on the avoided cost to replace the current leases. The Company measures the value of tenant relationships based on the rent lost due to the amount of time required to replace existing customers, which is based on the Company’s historical experience with turnover in its stores. Debt assumed as part of an acquisition is recorded at fair value based on current interest rates compared to contractual rates. Acquisition-related transaction costs, for those qualifying as asset acquisitions, are capitalized as a component of the cost of the assets acquired.

Fair Value of Financial Instruments

The carrying values of cash and cash equivalents, restricted cash, receivables, other financial instruments included in other assets, accounts payable and accrued expenses, variable-rate notes payable, lines of credit and other liabilities reflected in the condensed consolidated balance sheets at September 30, 2017 and December 31, 2016 approximate fair value.

The fair values of the Company’s notes receivable from Preferred Operating Partnership unit holders and other fixed rate notes receivable were based on the discounted estimated future cash flows of the notes (categorized within Level 3 of the fair value hierarchy); the discount rate used approximated the current market rate for loans with similar maturities and credit quality. The fair values of the Company’s fixed-rate notes payable and notes payable to trusts were estimated using the discounted estimated future cash payments to be made on such debt (categorized within Level 3 of the fair value hierarchy); the discount rates used approximated current market rates for loans, or groups of loans, with similar maturities and credit quality. The fair value of the Company’s exchangeable senior notes was estimated using an average market price for similar securities obtained from a third party.

The fair values of the Company’s fixed-rate assets and liabilities were as follows for the periods indicated:

	September 30, 2017				December 31, 2016
	Fair Value		Carrying Value		Fair Value		Carrying Value
Notes receivable from Preferred Operating Partnership unit holders	$	114,506	$	120,230	$	125,642	$	120,230
Fixed rate notes receivable	$	21,285	$	20,608	$	53,450	$	52,201
Fixed rate notes payable and notes payable to trusts	$	2,882,709	$	2,900,822	$	2,404,996	$	2,417,558
Exchangeable senior notes	$	702,118	$	624,384	$	706,827	$	638,170

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Earnings Per Common Share

9 Months Ended

Sep. 30, 2017

Earnings Per Share [Abstract]

Earnings Per Common Share

EARNINGS PER COMMON SHARE

Basic earnings per common share is computed using the two-class method by dividing net income attributable to common stockholders by the weighted average number of common shares outstanding during the period. All outstanding unvested restricted stock awards contain rights to non-forfeitable dividends and participate in undistributed earnings with common stockholders; accordingly, they are considered participating securities that are included in the two-class method. Diluted earnings per common share measures the performance of the Company over the reporting period while giving effect to all potential common shares that were dilutive and outstanding during the period. The denominator includes the weighted average number of basic shares and the number of additional common shares that would have been outstanding if the potential common shares that were dilutive had been issued, and is calculated using either the two-class, treasury stock or as if-converted method, whichever is most dilutive. Potential common shares are securities (such as options, convertible debt, Series A Participating Redeemable Preferred Units (“Series A Units”), Series B Redeemable Preferred Units (“Series B Units”), Series C Convertible Redeemable Preferred Units (“Series C Units”), Series D Redeemable Preferred Units (“Series D Units”) and common Operating Partnership units (“OP Units”)) that do not have a current right to participate in earnings of the Company but could do so in the future by virtue of their option, redemption or conversion right.

In computing the dilutive effect of convertible securities, net income is adjusted to add back any changes in earnings in the period associated with the convertible security. The numerator also is adjusted for the effects of any other non-discretionary changes in income or loss that would result from the assumed conversion of those potential common shares. In computing diluted earnings per common share, only potential common shares that are dilutive (those that reduce earnings per common share) are included. For the three months ended September 30, 2017 and 2016, options to purchase approximately 45,438 and 95,031 shares of common stock, respectively, and for the nine months ended September 30, 2017 and 2016, options to purchase approximately 97,697 and 84,919 shares of common stock, respectively, were excluded from the computation of earnings per share as their effect would have been anti-dilutive.

For the purposes of computing the diluted impact of the potential exchange of the Preferred Operating Partnership units for common shares upon redemption, where the Company has the option to redeem in cash or shares and where the Company has stated the intent and ability to settle the redemption in shares, the Company divided the total value of the Preferred Operating Partnership units by the average share price for the period presented. The average share price for the three months ended September 30, 2017 and 2016 was $77.84 and $84.41, respectively, and for the nine months ended September 30, 2017 and 2016, the average share price was $76.67 and $87.22, respectively. The following table presents the number of Preferred Operating Partnership units, and the potential common shares, that were excluded from the computation of earnings per share as their effect would have been anti-dilutive.

	For the Three Months Ended September 30,		For the Nine Months Ended September 30,
	2017	2016	2017	2016
	Equivalent Shares (if converted)	Equivalent Shares (if converted)	Equivalent Shares (if converted)	Equivalent Shares (if converted)
Series B Units	538,312	496,412	546,526	480,419
Series C Units	380,769	351,132	386,580	339,820
Series D Units	1,126,831	—	1,091,319	417,420
	2,045,912	847,544	2,024,425	1,237,659

The Operating Partnership had $49,384 of its 2.375% Exchangeable Senior Notes due 2033 (the “2013 Notes”) issued and outstanding as of September 30, 2017. The 2013 Notes could potentially have a dilutive impact on the Company’s earnings per share calculations. The 2013 Notes are exchangeable by holders into shares of the Company’s common stock under certain circumstances per the terms of the indenture governing the 2013 Notes. The exchange price of the 2013 Notes was $53.28 per share as of September 30, 2017, and could change over time as described in the indenture. The Company has irrevocably agreed to pay only cash for the accreted principal amount of the 2013 Notes relative to its exchange obligations, but retained the right to satisfy the exchange obligation in excess of the accreted principal amount in cash and/or common stock.

The Operating Partnership had $575,000 of its 3.125% Exchangeable Senior Notes due 2035 (the “2015 Notes”) issued and outstanding as of September 30, 2017. The 2015 Notes could potentially have a dilutive impact on the Company’s earnings per share calculations. The 2015 Notes are exchangeable by holders into shares of the Company’s common stock under certain circumstances per the terms of the indenture governing the 2015 Notes. The exchange price of the 2015 Notes was $94.01 per share as of September 30, 2017, and could change over time as described in the indenture. The Company has irrevocably agreed to pay only cash for the accreted principal amount of the 2015 Notes relative to its exchange obligations, but retained the right to satisfy the exchange obligation in excess of the accreted principal amount in cash and/or common stock.

Although the Company has retained the right to satisfy the exchange obligation in excess of the accreted principal amount of the 2013 Notes and 2015 Notes in cash and/or common stock, Accounting Standards Codification (“ASC”) 260, “Earnings per Share,” requires an assumption that shares would be used to pay such exchange obligation, and requires that those shares be included in the Company’s calculation of weighted average common shares outstanding for the diluted earnings per share computation. For the three and nine months ended September 30, 2017 and 2016, 292,439 and 413,498 shares, respectively, related to the 2013 Notes were included in the computation for diluted earnings per share. For the three and nine months ended September 30, 2017 and 2016, no shares related to the 2015 Notes were included in the computation for diluted earnings per share as the exchange price exceeded the per share price of the Company’s common stock during these periods.

For the purposes of computing the diluted impact on earnings per share of the potential exchange of Series A Units for common shares upon redemption, where the Company has the option to redeem in cash or shares and where the Company has stated the positive intent and ability to settle at least $115,000 of the instrument in cash (or net settle a portion of the Series A Units against the related outstanding note receivable), only the amount of the instrument in excess of $115,000 is considered in the calculation of shares contingently issuable for the purposes of computing diluted earnings per share as allowed by ASC 260-10-45-46. Accordingly, the number of shares included in the computation for diluted earnings per share related to the Series A Units is equal to the number of Series A Units outstanding, with no additional shares included related to the fixed $115,000 amount.

The computation of earnings per common share was as follows for the periods presented:

	For the Three Months Ended September 30,						For the Nine Months Ended September 30,
	2017			2016			2017			2016
Net income attributable to common stockholders	$	93,764		$	118,088		$	263,052		$	283,724
Earnings and dividends allocated to participating securities	(191		)	(248		)	(595		)	(616		)
Earnings for basic computations	93,573			117,840			262,457			283,108
Earnings and dividends allocated to participating securities	191			—			595			—
Income allocated to noncontrolling interest - Preferred Operating Partnership (Series A Units) and Operating Partnership	5,163			7,776			15,448			17,926
Fixed component of income allocated to noncontrolling interest - Preferred Operating Partnership (Series A Units)	(572		)	(1,271		)	(2,547		)	(3,814		)
Net income for diluted computations	$	98,355		$	124,345		$	275,953		$	297,220
Weighted average common shares outstanding:
Average number of common shares outstanding - basic	125,717,517			125,752,291			125,665,787			125,244,761
OP Units	5,590,231			5,534,350			5,586,908			5,557,723
Series A Units	875,480			875,480			875,480			875,480
Series D Units	—			814,435			—			—
Unvested restricted stock awards included for treasury stock method	280,484			—			288,831			—
Shares related to exchangeable senior notes and dilutive stock options	580,761			786,916			591,616			798,727
Average number of common shares outstanding - diluted	133,044,473			133,763,472			133,008,622			132,476,691
Earnings per common share
Basic	$	0.74		$	0.94		$	2.09		$	2.26
Diluted	$	0.74		$	0.93		$	2.07		$	2.24

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Store Acquisitions and Dispositions

9 Months Ended

Sep. 30, 2017

Business Combinations [Abstract]

Store Acquisitions and Dispositions

STORE ACQUISITIONS AND DISPOSITIONS

The following table shows the Company’s acquisitions of operating stores for the nine months ended September 30, 2017. The table excludes purchases of raw land or improvements made to existing assets.

					Consideration Paid												Total
Property Location	Number of Stores	Date of Acquisition	Total		Cash Paid		Loan Assumed		Non- controlling interests		Net Liabilities/(Assets) Assumed			Value of OP Units Issued		Number of OP Units Issued	Real estate assets
Georgia	1	9/1/2017	$	4,246	$	4,220	$	—	$	—	$	26		$	—	—	$	4,246
Florida	1	8/4/2017	9,047		7,058		—		—		(11		)	2,000		25,520	9,047
North Carolina	1	7/13/2017	8,422		8,426		—		—		(4		)	—		—	8,422
Virginia	1	7/13/2017	10,251		10,215		—		—		36			—		—	10,251
Florida	1	6/12/2017	11,100		4,270		—		—		20			6,810		272,400	11,100
Florida	1	4/25/2017	7,377		7,400		—		—		(23		)	—		—	7,377
Pennsylvania	1	4/11/2017	16,164		4,938		9,463		1,827		(64		)	—		—	16,164
Illinois	1	2/1/2017	9,028		9,020		—		—		8			—		—	9,028
Georgia	1	1/6/2017	16,528		16,521		—		—		7			—		—	16,528
2017 Totals	9		$	92,163	$	72,068	$	9,463	$	1,827	$	(5	)	$	8,810	297,920	$	92,163

Store Dispositions

On September 13, 2017, the Company closed on the sale of a parcel of land located in New York that had been classified as held for sale for $19,000 in cash. This parcel of land had been written down to its fair value less selling costs during the six months ended June 30, 2017, and therefore no additional gain or loss was recorded related to this sale at the time of closing.

On July 26, 2016, the Company closed on the sale of one operating store located in Indiana that had been classified as held for sale for $4,447 in cash. The Company recognized no gain or loss related to this disposition.

On April 20, 2016, the Company closed on the sale of seven operating stores located in Ohio and Indiana that had been classified as held for sale for $17,555 in cash. The Company recognized a gain of $11,265 related to this disposition.

On April 1, 2016, the Company disposed of a single store in Texas in exchange for 85,452 of our OP Units valued at $7,689. The Operating Partnership has canceled the OP Units received in this disposition. The Company recognized a gain of $93 related to this disposition.

Losses on Earnout from Prior Acquisition

In December 2014, the Company acquired a portfolio of five stores located in New Jersey and Virginia. As part of this acquisition, the Company agreed to make an additional cash payment to the sellers if the acquired stores exceeded a specified amount of net operating income for the years ending December 31, 2015 and 2016. At the acquisition date, the Company recorded an estimated liability related to this earnout provision. The operating income of these stores during the earnout period was higher than expected, resulting in an increase in the estimate of the amount due to the sellers of $1,544, which was recorded as a loss and included in gain (loss) on real estate transactions, earnout from prior acquisition and impairment of real estate in the Company’s condensed consolidated statements of operations for the nine months ended September 30, 2016.

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Variable Interests

9 Months Ended

Sep. 30, 2017

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Variable Interests

VARIABLE INTERESTS

The Operating Partnership has three wholly-owned unconsolidated subsidiaries (“Trust,” “Trust II” and “Trust III,” together, the “Trusts”) that have issued trust preferred securities to third parties and common securities to the Operating Partnership. The proceeds from the sale of the preferred and common securities were loaned in the form of notes to the Operating Partnership. The Trusts are VIEs because the holders of the equity investment at risk (the trust preferred securities) do not have the power to direct the activities of the entities that most significantly affect the entities’ economic performance because of their lack of voting or similar rights. Because the Operating Partnership’s investment in the Trusts’ common securities was financed directly by the Trusts as a result of its loan of the proceeds to the Operating Partnership, that investment is not considered an equity investment at risk. The Operating Partnership’s investment in the Trusts is not a variable interest because equity interests are variable interests only to the extent that the investment is considered to be at risk, and therefore the Operating Partnership cannot be the primary beneficiary of the Trusts. Since the Company is not the primary beneficiary of the Trusts, they have not been consolidated. A debt obligation has been recorded in the form of notes for the proceeds as discussed above, which are owed to the Trusts. The Company has also included its investment in the Trusts’ common securities in other assets on the condensed consolidated balance sheets.

The Company has not provided financing or other support during the periods presented to the Trusts that it was not previously contractually obligated to provide. The Company’s maximum exposure to loss as a result of its involvement with the Trusts is equal to the total amount of the notes discussed above less the amounts of the Company’s investments in the Trusts’ common securities. The net amount is equal to the notes payable that the Trusts owe to third parties for their investments in the Trusts’ preferred securities.

Following is a tabular comparison of the assets and liabilities the Company has recorded as a result of its involvement with the Trusts to the maximum exposure to loss the Company is subject to as a result of such involvement as of September 30, 2017:

	Notes payable to Trusts			Investment Balance		Maximum exposure to loss		Difference
Trust	$	36,083		$	1,083	$	35,000	$	—
Trust II	42,269			1,269		41,000		—
Trust III	41,238			1,238		40,000		—
	119,590			$	3,590	$	116,000	—
Unamortized debt issuance costs	(2,176		)
	$	117,414

The Company had no consolidated VIEs during the nine months ended September 30, 2017.

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Derivatives

9 Months Ended

Sep. 30, 2017

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Derivatives

DERIVATIVES

The Company is exposed to certain risks arising from both its business operations and economic conditions. The Company principally manages its exposures to a wide variety of business and operational risks through management of its core business activities. The Company manages economic risks, including interest rate, liquidity and credit risk, primarily by managing the amount, sources and duration of its debt funding and by using derivative financial instruments. Specifically, the Company enters into derivative financial instruments to manage exposure that arises from business activities that result in the receipt or payment of future known and uncertain cash amounts, the value of which are determined by interest rates. The Company’s derivative financial instruments are used to manage differences in the amount, timing and duration of the Company’s known or expected cash receipts and its known or expected cash payments principally related to the Company’s investments and borrowings.

Cash Flow Hedges of Interest Rate Risk

The Company’s objectives in using interest rate derivatives are to add stability to interest expense and to manage its exposure to interest rate movements. To accomplish these objectives, the Company primarily uses interest rate swaps as part of its interest rate risk management strategy. Interest rate swaps designated as cash flow hedges involve the receipt of variable amounts from a counterparty in exchange for the Company making fixed-rate payments over the life of the agreements without exchange of the underlying notional amount.

The effective portion of changes in the fair value of derivatives designated and that qualify as cash flow hedges is recorded in accumulated other comprehensive income (“OCI”) and is subsequently reclassified into earnings in the period that the hedged forecasted transaction affects earnings. A portion of these changes is excluded from accumulated other comprehensive income as it is allocated to noncontrolling interests. During the three and nine months ended September 30, 2017 and 2016, such derivatives were used to hedge the variable cash flows associated with existing variable-rate debt. In the coming 12 months, the Company estimates that an additional $1,513 will be reclassified as an increase to interest expense.

The Company held 30 derivative financial instruments which had a total combined notional amount of $2,255,018 as of September 30, 2017.

Fair Values of Derivative Instruments

The table below presents the fair value of the Company’s derivative financial instruments as well as their classification on the condensed consolidated balance sheets:

	Asset (Liability) Derivatives
	September 30, 2017			December 31, 2016
Derivatives designated as hedging instruments:	Fair Value
Other assets	$	23,584		$	23,844
Other liabilities	$	(1,430	)	$	(2,447	)

Effect of Derivative Instruments

The tables below present the effect of the Company’s derivative financial instruments on the condensed consolidated statements of operations for the periods presented. No tax effect has been presented as the derivative instruments are held by the Company:

	Gain (loss) recognized in OCI For the Three Months Ended September 30,					Location of amounts reclassified from OCI into income	Gain (loss) reclassified from OCI For the Three Months Ended September 30,
Type	2017			2016			2017			2016
Swap Agreements	$	(787	)	$	8,451	Interest expense	$	(1,572	)	$	(4,926	)

	Gain (loss) recognized in OCI For the Nine Months Ended September 30,						Location of amounts reclassified from OCI into income	Gain (loss) reclassified from OCI For the Nine Months Ended September 30,
Type	2017			2016				2017			2016
Swap Agreements	$	(6,474	)	$	(50,165	)	Interest expense	$	(7,497	)	$	(14,240	)

Credit-risk-related Contingent Features

The Company has agreements with some of its derivative counterparties that contain provisions pursuant to which the Company could be declared in default of its derivative obligations if the Company defaults on any of its indebtedness, including default where repayment of the indebtedness has not been accelerated by the lender.

The Company also has an agreement with some of its derivative counterparties that incorporates the loan covenant provisions of the Company’s indebtedness with a lender affiliate of the derivative counterparty. Failure to comply with the loan covenant provisions would result in the Company being in default on any derivative instrument obligations covered by the agreement.

As of September 30, 2017, the fair value of derivatives in a net liability position, which includes accrued interest but excludes any adjustment for nonperformance risk, related to these agreements was $1,257. As of September 30, 2017, the Company had not posted any collateral related to these agreements. If the Company had breached any of these provisions as of September 30, 2017, it could have been required to settle its obligations under the agreements at their termination value of $1,620, including accrued interest.

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Exchangeable Senior Notes

9 Months Ended

Sep. 30, 2017

Debt Disclosure [Abstract]

Exchangeable Senior Notes

EXCHANGEABLE SENIOR NOTES

In September 2015, the Operating Partnership issued $575,000 of its 3.125% Exchangeable Senior Notes due 2035. Costs incurred to issue the 2015 Notes were approximately $11,992, consisting primarily of a 2.0% underwriting fee. These costs are being amortized as an adjustment to interest expense over five years, which represents the estimated term based on the first available redemption date, and are included in exchangeable senior notes, net, in the condensed consolidated balance sheets. The 2015 Notes are general unsecured senior obligations of the Operating Partnership and are fully guaranteed by the Company. Interest is payable on April 1 and October 1 of each year beginning April 1, 2016, until the maturity date of October 1, 2035. The 2015 Notes bear interest at 3.125% per annum and contain an exchange settlement feature, which provides that the 2015 Notes may, under certain circumstances, be exchangeable for cash (for the principal amount of the 2015 Notes) and, with respect to any excess exchange value, for cash, shares of the Company’s common stock, or a combination of cash and shares of the Company’s common stock, at the Company’s option. The exchange rate of the 2015 Notes as of September 30, 2017 was approximately 10.64 shares of the Company’s common stock per $1,000 principal amount of the 2015 Notes.

The Operating Partnership may redeem the 2015 Notes at any time to preserve the Company’s status as a REIT. In addition, on or after October 5, 2020, the Operating Partnership may redeem the 2015 Notes for cash, in whole or in part, at 100% of the principal amount plus accrued and unpaid interest, upon at least 30 days but not more than 60 days prior written notice to the holders of the 2015 Notes. The holders of the 2015 Notes have the right to require the Operating Partnership to repurchase the 2015 Notes for cash, in whole or in part, on October 1 of the years 2020, 2025 and 2030 (unless the Operating Partnership has called the 2015 Notes for redemption), and upon the occurrence of certain designated events, in each case for a repurchase price equal to 100% of the principal amount of the 2015 Notes plus accrued and unpaid interest. Certain events are considered “Events of Default,” as defined in the indenture governing the 2015 Notes, which may result in the accelerated maturity of the 2015 Notes.

On June 21, 2013, the Operating Partnership issued $250,000 of its 2.375% Exchangeable Senior Notes due 2033 at a 1.5% discount, or $3,750. Costs incurred to issue the 2013 Notes were approximately $1,672. These costs are being amortized as an adjustment to interest expense over five years, which represents the estimated term based on the first available redemption date, and are included in exchangeable senior notes, net, in the condensed consolidated balance sheets. The 2013 Notes are general unsecured senior obligations of the Operating Partnership and are fully guaranteed by the Company. Interest is payable on January 1 and July 1 of each year beginning January 1, 2014, until the maturity date of July 1, 2033. The 2013 Notes bear interest at 2.375% per annum and contain an exchange settlement feature, which provides that the 2013 Notes may, under certain circumstances, be exchangeable for cash (for the principal amount of the 2013 Notes) and, with respect to any excess exchange value, for cash, shares of the Company’s common stock, or a combination of cash and shares of the Company’s common stock, at the Company’s option. The exchange rate of the 2013 Notes as of September 30, 2017 was approximately 18.77 shares of the Company’s common stock per $1,000 principal amount of the 2013 Notes.

The Operating Partnership may redeem the 2013 Notes at any time to preserve the Company’s status as a REIT. In addition, on or after July 5, 2018, the Operating Partnership may redeem the 2013 Notes for cash, in whole or in part, at 100% of the principal amount plus accrued and unpaid interest, upon at least 30 days but not more than 60 days prior written notice to the holders of the 2013 Notes. The holders of the 2013 Notes have the right to require the Operating Partnership to repurchase the 2013 Notes for cash, in whole or in part, on July 1 of the years 2018, 2023 and 2028, and upon the occurrence of certain designated events, in each case for a repurchase price equal to 100% of the principal amount of the 2013 Notes plus accrued and unpaid interest. Certain events are considered “Events of Default,” as defined in the indenture governing the 2013 Notes, which may result in the accelerated maturity of the 2013 Notes.

Additionally, the 2013 Notes and the 2015 Notes can be exchanged during any calendar quarter, if the last reported sale price of the common stock of the Company is greater than or equal to 130% of the exchange price for at least 20 trading days during a period of 30 consecutive trading days ending on the last trading day of the immediately preceding calendar quarter. The price of the Company’s common stock exceeded 130% of the exchange price for the required time period for the 2013 Notes during the quarter ended September 30, 2017. Therefore, holders of the 2013 Notes may elect to exchange such notes during the quarter ending December 31, 2017. The price of the Company’s common stock did not exceed 130% of the exchange price for the required time period for the 2015 Notes during the quarter ended September 30, 2017.

GAAP requires entities with convertible debt instruments that may be settled entirely or partially in cash upon conversion to separately account for the liability and equity components of the instrument in a manner that reflects the issuer’s economic interest cost. The Company therefore accounts for the liability and equity components of the 2013 Notes and 2015 Notes separately. The equity components are included in paid-in capital in stockholders’ equity in the condensed consolidated balance sheets, and the value of the equity components are treated as original issue discount for purposes of accounting for the debt components. The discounts are being amortized as interest expense over the remaining period of the debt through its first redemption date: July 1, 2018 for the 2013 Notes, and October 1, 2020 for the 2015 Notes. The effective interest rate on the liability components of both the 2013 Notes and the 2015 Notes is 4.0%, which approximated the market rate of interest of similar debt without exchange features (i.e. nonconvertible debt) at the time of issuance.

Information about the Company’s 2013 Notes and 2015 Notes, including the total carrying amounts of the equity components, the principal amounts of the liability components, the unamortized discounts and the net carrying amounts was as follows for the periods indicated:

	September 30, 2017			December 31, 2016
Carrying amount of equity component - 2013 Notes	$	—		$	—
Carrying amount of equity component - 2015 Notes	22,597			22,597
Carrying amount of equity components	$	22,597		$	22,597
Principal amount of liability component - 2013 Notes	$	49,384		$	63,170
Principal amount of liability component - 2015 Notes	575,000			575,000
Unamortized discount - equity component - 2013 Notes	(475		)	(1,187		)
Unamortized discount - equity component - 2015 Notes	(14,091		)	(17,355		)
Unamortized cash discount - 2013 Notes	(110		)	(281		)
Unamortized debt issuance costs	(7,223		)	(9,033		)
Net carrying amount of liability components	$	602,485		$	610,314

The amount of interest cost recognized relating to the contractual interest rates and the amortization of the discounts on the liability components of the Notes were as follows for the periods indicated:

	For the Three Months Ended September 30,				For the Nine Months Ended September 30,
	2017		2016		2017		2016
Contractual interest	$	4,785	$	4,867	$	14,519	$	14,616
Amortization of discount	1,268		1,243		3,827		3,716
Total interest expense recognized	$	6,053	$	6,110	$	18,346	$	18,332

Repurchases of 2013 Notes

During July and August 2017, the Company repurchased a total principal amount of $13,786 of the 2013 Notes. The Company paid cash of $19,853 for the total of the principal amount and the exchange value in excess of the principal amount.

The Company allocated the value of the consideration paid to repurchase the 2013 Notes (1) to the extinguishment of the liability component and (2) to the reacquisition of the equity component. The amount allocated to the extinguishment of the liability component is equal to the fair value of that component immediately prior to extinguishment. The difference between the consideration attributed to the extinguishment of the liability component and the sum of (a) the net carrying amount of the repurchased liability component, and (b) the related unamortized debt issuance costs, is recognized as a gain on debt extinguishment. The remaining settlement consideration is allocated to the reacquisition of the equity component of the repurchased 2013 Notes and recognized as a reduction of stockholders’ equity.

Information about the repurchases is as follows:

	July/August 2017
Principal amount repurchased	$	13,786
Amount allocated to:
Extinguishment of liability component	$	13,568
Reacquisition of equity component	6,285
Total consideration paid for repurchase	$	19,853
Exchangeable senior notes repurchased	$	13,786
Extinguishment of liability component	(13,568		)
Discount on exchangeable senior notes	(183		)
Related debt issuance costs	(35		)
Gain/(loss) on repurchase	$	—

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Stockholders' Equity

9 Months Ended

Sep. 30, 2017

Stockholders' Equity Note [Abstract]

Stockholders' Equity

STOCKHOLDERS’ EQUITY

On May 6, 2016, the Company filed its current $400,000 "at the market" equity program with the Securities and Exchange Commission using a new shelf registration statement on Form S-3, and entered into separate equity distribution agreements with five sales agents. Under the terms of the current equity distribution agreements, the Company may from time to time offer and sell shares of common stock, up to the aggregate offering price of $400,000, through its sales agents.

During the three and nine months ended September 30, 2017, the Company did not issue any shares and had $349,375 available for issuance under the existing equity distribution agreements.

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Noncontrolling Interest Represented by Preferred Operating Partnership Units

9 Months Ended

Sep. 30, 2017

Preferred Operating Partnership Units [Member]

Noncontrolling Interest [Line Items]

Noncontrolling Interest Represented by Preferred Operating Partnership Units

NONCONTROLLING INTEREST REPRESENTED BY PREFERRED OPERATING PARTNERSHIP UNITS

Classification of Noncontrolling Interests

GAAP requires a company to present ownership interests in subsidiaries held by parties other than the company in the consolidated financial statements within the equity section, but separate from the company’s equity. It also requires the amount of consolidated net income attributable to the parent and to the noncontrolling interest to be clearly identified and presented on the face of the consolidated statement of operations and requires changes in ownership interest to be accounted for similarly as equity transactions. If noncontrolling interests are determined to be redeemable, they are to be carried at their redemption value as of the balance sheet date and reported as temporary equity.

The Company has evaluated the terms of the Operating Partnership’s preferred units and classifies the noncontrolling interest represented by such preferred units as stockholders’ equity in the accompanying condensed consolidated balance sheets. The Company will periodically evaluate individual noncontrolling interests for the ability to continue to recognize the noncontrolling interest as permanent equity in the condensed consolidated balance sheets. Any noncontrolling interests that fail to qualify as permanent equity will be reclassified as temporary equity and adjusted to the greater of (1) the carrying amount and (2) the redemption value as of the end of the period in which the determination is made.

Series A Participating Redeemable Preferred Units

On June 15, 2007, the Operating Partnership entered into a Contribution Agreement with various limited partnerships affiliated with AAAAA Rent-A-Space to acquire ten stores in exchange for 989,980 Series A Units of the Operating Partnership. The stores are located in California and Hawaii.

The partnership agreement of the Operating Partnership (as amended, the “Partnership Agreement”) provides for the designation and issuance of the Series A Units. The Series A Units will have priority over all other partnership interests of the Operating Partnership with respect to distributions and liquidation.

Under the Partnership Agreement, Series A Units in the amount of $115,000 bear a fixed priority return of 2.3% and have a fixed liquidation value of $115,000. The remaining balance participates in distributions with, and has a liquidation value equal to, that of the OP Units. The Series A Units are redeemable at the option of the holder, which redemption obligation may be satisfied, at the Company’s option, in cash or shares of its common stock. On April 18, 2017, the holders of the Series A Units and the Operating Partnership agreed to reduce the fixed priority return on the Series A Units from 5.0% to 2.3% in exchange for a reduction in the interest rate of the related loan, as more fully described below.

On June 25, 2007, the Operating Partnership loaned the holders of the Series A Units $100,000. The note receivable bears interest at 2.1%. On April 18, 2017, a loan amendment was signed modifying the maturity date of the loan to the later of the death of the Series A Unit holder or his spouse. The loan amendment also lowered the interest rate of the loan from 4.9% to 2.1%. The loan amendment was determined to be a loan modification under GAAP, and therefore no change in value was recognized. The loan is secured by the borrower’s Series A Units. The holders of the Series A Units could redeem up to 114,500 Series A Units prior to the maturity date of the loan. If any redemption in excess of 114,500 Series A Units occurs prior to the maturity date, the holder of the Series A Units is required to repay the loan as of the date of that redemption. On October 3, 2014, the holders of the Series A Units redeemed 114,500 Series A Units for $4,794 in cash and 280,331 shares of common stock. No additional redemption of Series A Units can be made without repayment of the loan. The Series A Units are shown on the balance sheet net of the $100,000 loan because the borrower under the loan receivable is also the holder of the Series A Units.

Series B Redeemable Preferred Units

On April 3, 2014, the Operating Partnership completed the purchase of a store located in Georgia. This store was acquired in exchange for $15,158 of cash and 333,360 Series B Units valued at $8,334.

On August 29, 2013, the Operating Partnership completed the purchase of 19 out of 20 stores affiliated with All Aboard Mini Storage, all of which are located in California. On September 26, 2013, the Operating Partnership completed the purchase of the remaining store. These stores were acquired in exchange for $100,876 of cash (including $98,960 of debt assumed and immediately defeased at closing), 1,342,727 Series B Units valued at $33,568, and 1,448,108 OP Units valued at $62,341.

The Partnership Agreement provides for the designation and issuance of the Series B Units. The Series B Units rank junior to the Series A Units, on parity with the Series C Units and Series D Units, and senior to all other partnership interests of the Operating Partnership with respect to distributions and liquidation.

The outstanding Series B Units have a liquidation value of $25.00 per unit for a fixed liquidation value of $41,902. Holders of the Series B Units receive distributions at an annual rate of 6.0%. These distributions are cumulative. The Series B Units became redeemable at the option of the holder on the first anniversary of the date of issuance, which redemption obligation may be satisfied at the Company’s option in cash or shares of its common stock.

Series C Convertible Redeemable Preferred Units

The Company completed the purchase of twelve stores in California between December 2013 and May 2014. The Company previously held 35% interests in five of these stores and a 40% interest in one store through six separate joint ventures. These stores were acquired in exchange for a total of approximately $45,722 of cash, the assumption of $37,532 in existing debt, and the issuance of 704,016 Series C Units valued at $30,960.

The Partnership Agreement provides for the designation and issuance of the Series C Units. The Series C Units rank junior to the Series A Units, on parity with the Series B Units and Series D Units, and senior to all other partnership interests of the Operating Partnership with respect to distributions and liquidation.

The outstanding Series C Units have a liquidation value of $42.10 per unit for a fixed liquidation value of $29,639. From issuance to the fifth anniversary of issuance, each Series C Unit holder will receive quarterly distributions equal to the quarterly distribution per OP Unit plus $0.18. Beginning on the fifth anniversary of issuance, each Series C Unit holder will receive a fixed quarterly distribution equal to the aggregate quarterly distribution payable in respect of such Series C Unit during the four quarters immediately preceding the fifth anniversary of issuance, divided by four. These distributions are cumulative. The Series C Units became redeemable at the option of the holder one year from the date of issuance, which redemption obligation may be satisfied at the Company’s option in cash or shares of its common stock. The Series C Units are convertible into OP Units at the option of the holder at a rate of 0.9145 OP Units per Series C Unit converted. This conversion option expires upon the fifth anniversary of the date of issuance.

In December 2014, the Operating Partnership loaned certain holders of the Series C Units $20,230. The notes receivable, which are collateralized by the Series C Units, bear interest at 5.0% per annum and mature on December 15, 2024. The Series C Units are shown on the balance sheet net of the $20,230 loan because the borrower under the loan receivable is also the holder of the Series C Units.

Series D Redeemable Preferred Units

On June 12, 2017, the Operating Partnership completed the acquisition of a store located in Florida. This store was acquired in exchange for $4,270 in cash and 272,400 Series D-5 Preferred Units ("D-5 Units") valued at $6,810.

On November 8, 2016, the Operating Partnership completed the acquisition of a store located in Illinois. This store was acquired in exchange for 486,244 Series D-4 Preferred Units ("D-4 Units") valued at $12,156.

On June 10, 2016, the Operating Partnership completed the acquisition of four stores located in Illinois. These stores were acquired in exchange for 2,201,467 Series D-3 Preferred Units ("D-3 Units") valued at $55,037.

In December 2014, the Operating Partnership completed the acquisition of a store located in Florida. This store was acquired in exchange for $5,621 in cash and 548,390 Series D-1 Preferred Units ("D-1 Units," and together with the D-3 Units, D-4 Units and D-5 Units, "Series D Units") valued at $13,710.

The Partnership Agreement provides for the designation and issuance of the Series D Units. The Series D Units rank junior to the Series A Units, on parity with the Series B Units and Series C Units, and senior to all other partnership interests of the Operating Partnership with respect to distributions and liquidation.

The Series D Units have a liquidation value of $25.00 per unit, for a fixed liquidation value of $87,713. Holders of the Series D Units receive distributions at an annual rate between 3.5% to 5.0%. These distributions are cumulative. The Series D Units become redeemable at the option of the holder on the first anniversary of the date of issuance, which redemption obligation may be satisfied at the Company’s option in cash or shares of its common stock. In addition, the D-3 Units are convertible into OP Units at the option of the holder until the tenth anniversary of the date of issuance, with the number of OP Units to be issued equal to $25.00 per D-3 Unit, divided by the value of a share of common stock as of the exchange date.

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Noncontrolling Interest in Operating Partnership

9 Months Ended

Sep. 30, 2017

Common Operating Partnership [Member]

Noncontrolling Interest [Line Items]

Noncontrolling Interest in Operating Partnership

NONCONTROLLING INTEREST IN OPERATING PARTNERSHIP

The Company’s interest in its stores is held through the Operating Partnership. ESS Holding Business Trust I, a wholly-owned subsidiary of the Company, is the sole general partner of the Operating Partnership. ESS Holding Business Trust II, also a wholly-owned subsidiary of the Company, is a limited partner of the Operating Partnership. Between its general partner and limited partner interests, the Company held a 91.1% ownership interest in the Operating Partnership as of September 30, 2017. The remaining ownership interests in the Operating Partnership (including Preferred Operating Partnership units) of 8.9% are held by certain former owners of assets acquired by the Operating Partnership.

The noncontrolling interest in the Operating Partnership represents OP Units that are not owned by the Company. In conjunction with the formation of the Company, and as a result of subsequent acquisitions, certain persons and entities contributing interests in stores to the Operating Partnership received limited partnership interests in the form of OP Units. Limited partners who received OP Units in the formation transactions or in exchange for contributions for interests in stores have the right to require the Operating Partnership to redeem part or all of their OP Units for cash based upon the fair market value of an equivalent number of shares of the Company’s common stock (based on the ten-day average trading price) at the time of the redemption. Alternatively, the Company may, in its sole discretion, elect to acquire those OP Units in exchange for shares of its common stock on a one-for-one basis, subject to anti-dilution adjustments provided in the Partnership Agreement. The ten-day average closing stock price at September 30, 2017 was $79.26 and there were 5,599,662 OP Units outstanding. Assuming that all of the OP Unit holders exercised their right to redeem all of their OP Units on September 30, 2017 and the Company elected to pay the OP Unit holders cash, the Company would have paid $443,829 in cash consideration to redeem the units.

On August 4, 2017, the Company purchased one store located in Florida. As part of the consideration for this acquisition, 25,520 OP Units were issues with a total value of $2,000.

During the three months ended September 30, 2017, no OP Units were redeemed. During the nine months ended September 30, 2017, 33,896 OP Units were redeemed for $2,510 in cash.

GAAP requires a company to present ownership interests in subsidiaries held by parties other than the company in the consolidated financial statements within the equity section, but separate from the company’s equity. It also requires the amount of consolidated net income attributable to the parent and to the noncontrolling interest to be clearly identified and presented on the face of the consolidated statement of operations, and requires changes in ownership interest to be accounted for similarly as equity transactions. If noncontrolling interests are determined to be redeemable, they are to be carried at their redemption value as of the balance sheet date and reported as temporary equity.

The Company has evaluated the terms of the OP Units and classifies the noncontrolling interest represented by the OP Units as stockholders’ equity in the accompanying condensed consolidated balance sheets. The Company will periodically evaluate individual noncontrolling interests for the ability to continue to recognize the noncontrolling amount as permanent equity in the condensed consolidated balance sheets. Any noncontrolling interests that fail to qualify as permanent equity will be reclassified as temporary equity and adjusted to the greater of (1) the carrying amount and (2) the redemption value as of the end of the period in which the determination is made.

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Other Noncontrolling Interests

9 Months Ended

Sep. 30, 2017

Other Noncontrolling Interests [Member]

Noncontrolling Interest [Line Items]

Other Noncontrolling Interests

OTHER NONCONTROLLING INTERESTS

Other noncontrolling interests represent the ownership interests of a third party in two consolidated joint ventures as of September 30, 2017. One joint venture owns an operating store in Texas, and the other owns a store in Pennsylvania. The voting interests of the third-party owners are between 20.0% and 27.0%.

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Equity in Earnings of Unconsolidated Real Estate Ventures - Gain on Sale of Real Estate and Purchase of Joint Venture Partner's Interest

9 Months Ended

Sep. 30, 2017

Equity Method Investments and Joint Ventures [Abstract]

Equity in Earnings of Unconsolidated Real Estate Ventures - Gain on Sale of Real Estate and Purchase of Joint Venture Partner's Interest

EQUITY IN EARNINGS OF UNCONSOLIDATED REAL ESTATE VENTURES—GAIN ON PURCHASE OF JOINT VENTURE PARTNER'S INTEREST

On September 16, 2016, the Company acquired 23 stores from its ESS PRISA II LLC joint venture ("PRISA II") in a step acquisition. These stores are located in Arizona, California, Connecticut, Florida, Indiana, Kentucky, Massachusetts, Maryland, Michigan, New Jersey, New Mexico, Ohio, Tennessee and Virginia. The Company owned 4.42% of PRISA II, with the other 95.58% owned by affiliates of Prudential Global Investment Management ("Prudential"). PRISA II created a new subsidiary, Extra Space Properties 131 LLC ("ESP 131"), and transferred 23 stores into ESP 131. PRISA II then distributed ESP 131 to the Company and Prudential on a pro rata basis. This distribution was accounted for as a spinoff, and was therefore recorded at the net carrying amount of the properties of $4,326. Immediately after the distribution, the Company acquired Prudential's 95.58% interest in ESP 131 for $238,679, resulting in 100% ownership of ESP 131 and the related 23 stores. Based on the purchase price of Prudential's share of ESP 131, the Company determined that the fair value of its investment in ESP 131 immediately prior to the acquisition of Prudential's share was $10,988, and the Company recorded a gain of $6,662 as a result of re-measuring to fair value its existing equity interest in ESP 131. This gain is included in equity in earnings of unconsolidated real estate ventures - gain on sale of real estate assets and purchase of joint venture partners' interests on the Company's condensed consolidated statements of operations. The Company recorded fixed assets related to this acquisition of $248,530, which includes total cash paid, the investment in ESP 131, and the step acquisition gain, less net assets acquired. Subsequent to these transactions, PRISA II owned 42 stores. The Company sold its 4.42% interest in PRISA II to Prudential immediately following these transactions for $34,758 in cash. The carrying value of the Company's investment prior to the acquisition was $3,912, and the Company recorded a gain on the sale of $30,846. This gain is included in equity in earnings of unconsolidated real estate ventures - gain on sale of real estate assets and purchase of joint venture partners' interests on the Company's condensed consolidated statements of operations.

On February 2, 2016, the Company acquired six stores from its VRS Self Storage LLC joint venture (“VRS”) in a step acquisition. These stores are located in Florida, Maryland, Nevada, New York, and Tennessee. The Company owns 45.0% of VRS, with the other 55.0% owned by affiliates of Prudential. VRS created a new subsidiary, Extra Space Properties 122 LLC (“ESP 122”) and transferred six stores into ESP 122. VRS then distributed ESP 122 to the Company and Prudential on a pro rata basis. This distribution was accounted for as a spinoff, and was therefore recorded at the net carrying amount of the stores of $17,261. Immediately after the distribution, the Company acquired Prudential’s 55.0% interest in ESP 122 for $53,940, resulting in 100% ownership of ESP 122 and the related six stores. Based on the purchase price of Prudential’s share of ESP 122, the Company determined that the fair value of its investment in ESP 122 immediately prior to the acquisition of Prudential’s share was $44,184, and the Company recorded a gain of $26,923 during the nine months ended September 30, 2016 as a result of remeasuring to fair value its existing equity interest in ESP 122. This gain is included in equity in earnings of unconsolidated real estate ventures - gain on sale of real estate assets and purchase of joint venture partners' interests on the Company’s condensed consolidated statements of operations. The Company recorded fixed assets related to this acquisition of $98,082, which includes total cash paid, the investment in ESP 122, and the step acquisition gain, less net assets acquired.

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Segment Information

9 Months Ended

Sep. 30, 2017

Segment Reporting [Abstract]

Segment Information

SEGMENT INFORMATION

The Company operates in three distinct segments: (1) rental operations; (2) tenant reinsurance; and (3) property management, acquisition and development. Management fees collected for consolidated joint venture stores are eliminated in consolidation. Financial information for the Company’s business segments is presented below:

	September 30, 2017		December 31, 2016
Balance Sheet
Investment in unconsolidated real estate ventures
Rental operations	$	78,512	$	79,570
Total assets
Rental operations	$	6,728,499	$	6,731,292
Tenant reinsurance	42,786		44,524
Property management, acquisition and development	315,670		315,630
	$	7,086,955	$	7,091,446

	For the Three Months Ended September 30,						For the Nine Months Ended September 30,
	2017			2016			2017			2016
Statement of Operations
Total revenues
Rental operations	$	248,589		$	224,451		$	720,878		$	635,730
Tenant reinsurance	25,882			22,727			73,050			64,936
Property management, acquisition and development	9,685			10,005			29,239			30,193
	284,156			257,183			823,167			730,859
Operating expenses, including depreciation and amortization
Rental operations	115,162			106,530			341,191			312,389
Tenant reinsurance	6,272			4,093			13,996			12,345
Property management, acquisition and development	22,841			23,836			67,489			79,471
	144,275			134,459			422,676			404,205
Income (loss) from operations
Rental operations	133,427			117,921			379,687			323,341
Tenant reinsurance	19,610			18,634			59,054			52,591
Property management, acquisition and development	(13,156		)	(13,831		)	(38,250		)	(49,278		)
	139,881			122,724			400,491			326,654
Gain (loss) on real estate transactions, earnout from prior acquisition and impairment of real estate
Property management, acquisition and development	—			—			(6,019		)	9,814
Interest expense
Rental operations	(38,379		)	(32,619		)	(109,414		)	(95,125		)
Property management, acquisition and development	(1,387		)	(875		)	(3,778		)	(2,530		)
	(39,766		)	(33,494		)	(113,192		)	(97,655		)
Non-cash interest expense related to the amortization of discount on equity component of exchangeable senior notes
Property management, acquisition and development	(1,268		)	(1,243		)	(3,827		)	(3,716		)
Interest income
Property management, acquisition and development	869			1,358			2,797			4,697
Interest income on note receivable from Preferred Operating Partnership unit holder
Property management, acquisition and development	532			1,213			2,404			3,638
Equity in earnings of unconsolidated real estate ventures
Rental operations	3,990			3,625			11,407			9,813
Equity in earnings of unconsolidated real estate ventures - gain on sale of real estate assets and purchase of joint venture partners' interests
Property management, acquisition and development	—			37,509			—			64,432
Income tax (expense) benefit
Rental operations	(834		)	(550		)	(1,759		)	(1,840		)
Tenant reinsurance	(3,572		)	(3,504		)	(10,701		)	(9,352		)
Property management, acquisition and development	1,243			(412		)	3,306			188
	(3,163		)	(4,466		)	(9,154		)	(11,004		)
Net income (loss)
Rental operations	98,204			88,377			279,921			236,189
Tenant reinsurance	16,038			15,130			48,353			43,239
Property management, acquisition and development	(13,167		)	23,719			(43,367		)	27,245
	$	101,075		$	127,226		$	284,907		$	306,673

	For the Three Months Ended September 30,				For the Nine Months Ended September 30,
	2017		2016		2017			2016
Depreciation and amortization expense
Rental operations	$	44,732	$	44,189	$	136,821		$	126,506
Property management, acquisition and development	3,343		2,366		7,318			6,896
	$	48,075	$	46,555	$	144,139		$	133,402
Statement of Cash Flows
Acquisition of real estate assets
Property management, acquisition and development					$	(119,040	)	$	(763,246	)
Development and redevelopment of real estate assets
Property management, acquisition and development					$	(20,670	)	$	(18,492	)

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Commitments and Contingencies

9 Months Ended

Sep. 30, 2017

Commitments and Contingencies Disclosure [Abstract]

Commitments and Contingencies

COMMITMENTS AND CONTINGENCIES

As of September 30, 2017, the Company is involved in various legal proceedings and is subject to various claims and complaints arising in the ordinary course of business. Because litigation is inherently unpredictable, the outcome of these matters cannot presently be determined with any degree of certainty. In accordance with applicable accounting guidance, management establishes an accrued liability for litigation when those matters present loss contingencies that are both probable and reasonably estimable. In such cases, there may be an exposure to loss in excess of any amounts accrued. The estimated loss, if any, is based upon currently available information and is subject to significant judgment, a variety of assumptions, and known and unknown uncertainties. The Company could in the future incur judgments or enter into settlements of claims that could have a material adverse effect on its results of operations in any particular period, notwithstanding the fact that the Company is currently vigorously defending any legal proceedings against it.

As of September 30, 2017, the Company was under agreement to acquire 35 stores at a total purchase price of $462,116. Of these stores, 23 are scheduled to close in 2017 at a purchase price of $308,225, nine are scheduled to close in 2018 at a purchase price of $118,463, and three are scheduled to close thereafter at a purchase price of $35,428. Additionally, the Company is under agreement to acquire 19 stores with joint venture partners, for a total investment of $96,750. Six of these stores are scheduled to close in 2017, while the remaining 13 stores are expected to close in 2018.

The Company owns and/or operates stores located in Texas, Florida, and Puerto Rico that were impacted by Hurricanes Harvey, Irma, and Maria during the three months ended September 30, 2017. Losses incurred to date by these hurricanes include property damage, net of insurance recoveries, of $2,110, and tenant reinsurance claims of $2,250, which are included in property operations and tenant reinsurance on the Company's condensed consolidated statements of operations.

Although there can be no assurance, the Company is not aware of any material environmental liability, for which it believes it will be ultimately responsible, that could have a material adverse effect on its financial condition or results of operations. However, changes in applicable environmental laws and regulations, the uses and conditions of properties in the vicinity of the Company’s stores, the activities of its tenants and other environmental conditions of which the Company is unaware with respect to its stores could result in future material environmental liabilities.

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Subsequent Events (Notes)

9 Months Ended

Sep. 30, 2017

Subsequent Events [Abstract]

Subsequent Events

SUBSEQUENT EVENTS

Subsequent to September 30, 2017, the Company purchased seven stores located in Georgia, Maryland, Oregon, Virginia and Washington for a total purchase price of $83,125.

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Basis of Presentation (Policies)

9 Months Ended

Sep. 30, 2017

Accounting Policies [Abstract]

Recently Issued Accounting Standards

Recently Issued Accounting Standards

In May 2014, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) 2014-09, “Revenue from Contracts with Customers,” which amends the guidance for revenue recognition to replace numerous, industry-specific requirements and converges areas under this topic with those of the International Financial Reporting Standards. ASU 2014-09 outlines a five-step process for customer contract revenue recognition that focuses on transfer of control, as opposed to transfer of risk and rewards. The amendment also requires enhanced disclosures regarding the nature, amount, timing and uncertainty of revenues and cash flows from contracts with customers. The new standard will become effective for annual and interim periods beginning after December 15, 2017 with early adoption permitted. The Company has determined that its property rental revenue and tenant reinsurance revenue will not be subject to the guidance in ASU 2014-09, as they qualify as lease contracts and insurance contracts, which are excluded from its scope. The Company's management fee revenue will be included in the scope of the standard. However, based on the Company's initial assessment, it appears that revenue recognized under the standard will not differ materially from revenue recognized under existing guidance. The Company continues to assess the potential impacts of ASU 2014-09. The Company anticipates adopting the standard using the modified retrospective transition method as of January 1, 2018.

In February 2016, the FASB issued ASU 2016-02, “Leases (Topic 842),” which modifies the accounting for leases, intending to increase transparency and comparability of organizations by requiring balance sheet presentation of leased assets and increased financial statement disclosure of leasing arrangements. ASU 2016-02 will require entities to recognize a liability for their lease obligations and a corresponding asset representing the right to use the underlying asset over the lease term. Lease obligations are to be measured at their present value and accounted for using the effective interest method. The accounting for the leased asset will differ slightly depending on whether the agreement is deemed to be a financing or operating lease. For financing leases, the leased asset is depreciated on a straight-line basis and depreciation expense is recorded separately from the interest expense in the statements of operations, resulting in higher expense in the earlier part of the lease term. For operating leases, the depreciation and interest expense components are combined, recognized evenly over the term of the lease, and presented as a reduction to operating income. ASU 2016-02 requires that assets and liabilities be presented or disclosed separately, and requires additional disclosure of certain qualitative and quantitative information related to these lease agreements. ASU 2016-02 is effective for annual and interim periods beginning after December 15, 2018. The Company is currently assessing the impact of the adoption of ASU 2016-02 on the Company’s consolidated financial statements.

In March 2016, the FASB issued ASU 2016-05, "Derivatives and Hedging (Topic 815): Effect of Derivative Contract Novations on Existing Hedge Accounting Relationships." ASU 2016-05 clarifies that a change in the counterparty to a derivative instrument that has been designated as a hedging instrument does not, in and of itself, require re-designation of that hedging relationship provided that all other hedge accounting criteria continue to be met. The Company adopted this guidance on January 1, 2017. The adoption of ASU 2016-05 did not have a material impact on the Company's consolidated financial statements.

In March 2016, the FASB issued ASU 2016-09, “Stock Compensation (Topic 718): Improvements to Employee Share-Based Payment Accounting.” ASU 2016-09 simplifies several aspects of the accounting for employee share-based payment transactions, including the income tax consequences, classification of awards as either equity or liabilities, and classification on the statement of cash flows. This ASU is effective for fiscal years beginning after December 15, 2016, including interim periods within those fiscal years. The Company adopted this guidance prospectively on January 1, 2017, and prior periods have not

been adjusted. As a result of the adoption of this guidance, the Company no longer presents the tax effects from vesting of restricted stock grants and stock option exercises on its condensed consolidated statement of noncontrolling interests and equity.

In August 2016, the FASB issued ASU 2016-15, "Statement of Cash Flows (Topic 230): Classification of Certain Cash Receipts and Cash Payments." ASU 2016-15 provides guidance on several specific cash flow issues, including the classification of debt prepayment or debt extinguishment costs, contingent consideration payments, and distributions received from equity method investees. This guidance is effective for fiscal years beginning after December 15, 2017. The Company is currently evaluating the new guidance to determine the impact it may have on its consolidated financial statements.

In October 2016, the FASB issued ASU 2016-18, "Statement of Cash Flows (Topic 230): Restricted Cash," which requires that a statement of cash flows explains the change during the period in the total of cash, cash equivalents, and amounts generally described as restricted cash or restricted cash equivalents. Therefore, amounts generally described as restricted cash and restricted cash equivalents should be included with cash and cash equivalents when reconciling the beginning-of-period and end-of-period total amounts shown on the statement of cash flows. This guidance is effective for fiscal years beginning after December 15, 2017, and interim periods within those fiscal years. Early adoption is permitted. The Company is currently evaluating the new guidance to determine the impact it may have on its consolidated financial statements.

In January 2017, the FASB issued ASU 2017-01, "Business Combinations (Topic 805): Clarifying the Definition of a Business," which provides guidance on whether transactions should be accounted for as acquisitions or disposals of assets or businesses. Specifically, when substantially all of the fair value of the gross assets acquired (or disposed of) is concentrated in a single identifiable asset or group of similar identifiable assets, the set of assets is not a business. Additionally, ASU 2017-01 also provides other guidance providing a more robust framework to use in determining whether a set of assets and activities is a

business. This guidance is effective for annual periods beginning after December 15, 2017. Early adoption is permitted for transactions for which the acquisition or disposition date occurs before the issuance date or effective date of the amendments, only when the transaction has not been reported in financial statements that have been issued. The Company adopted ASU 2017-01 for new acquisitions beginning on January 1, 2017. The costs related to the acquisitions of stores that qualify as asset acquisitions will be capitalized as part of the purchase.

In August 2017, the FASB issued ASU 2017-12, "Derivatives and Hedging (Topic 815): Targeted Improvements for Accounting for Hedging Activities," which amends and simplifies existing guidance for the financial reporting of hedging relationships to allow companies to better portray the economic effects of risk management activities in their financial statements. ASU 2017-12 is effective for annual periods beginning after December 15, 2018, with early adoption permitted. The Company is currently evaluating the new guidance to determine the impact it may have on its consolidated financial statements.

Fair Value Disclosures

Derivative Financial Instruments

Currently, the Company uses interest rate swaps to manage its interest rate risk. The valuation of these instruments is determined using widely accepted valuation techniques, including discounted cash flow analysis on the expected cash flows of each derivative. This analysis reflects the contractual terms of the derivatives, including the period to maturity, and uses observable market-based inputs, including interest rate curves. The fair values of interest rate swaps are determined using the market standard methodology of netting the discounted future fixed cash payments and the discounted expected variable cash receipts. The variable cash receipts are based on an expectation of future interest rates (forward curves) derived from observable market interest rate forward curves.

The Company incorporates credit valuation adjustments to appropriately reflect both its own nonperformance risk and the respective counterparty’s nonperformance risk in the fair value measurements. In adjusting the fair value of its derivative contracts for the effect of nonperformance risk, the Company has considered the impact of netting and any applicable credit enhancements, such as collateral postings, thresholds, mutual puts and guarantees. In conjunction with the FASB’s fair value measurement guidance, the Company made an accounting policy election to measure the credit risk of its derivative financial instruments that are subject to master netting agreements on a net basis by counterparty portfolio.

Although the Company has determined that the majority of the inputs used to value its derivatives fall within Level 2 of the fair value hierarchy, the credit valuation adjustments associated with its derivatives utilize Level 3 inputs, such as estimates of current credit spreads to evaluate the likelihood of default by the Company and its counterparties. However, as of September 30, 2017, the Company had assessed the significance of the impact of the credit valuation adjustments on the overall valuation of its derivative positions and determined that the credit valuation adjustments were not significant to the overall valuation of its derivatives. As a result, the Company determined that its derivative valuations in their entirety were classified in Level 2 of the fair value hierarchy.

Assets and Liabilities Measured at Fair Value on a Nonrecurring Basis

Long-lived assets held for use are evaluated for impairment when events or circumstances indicate there may be impairment. The Company reviews each store at least annually to determine if any such events or circumstances have occurred or exist. The Company focuses on stores where occupancy and/or rental income have decreased by a significant amount. For these stores, the Company determines whether the decrease is temporary or permanent, and whether the store will likely recover the lost occupancy and/or revenue in the short term. In addition, the Company carefully reviews stores in the lease-up stage and compares actual operating results to original projections.

When the Company determines that an event that may indicate impairment has occurred, the Company compares the carrying value of the related long-lived assets to the undiscounted future net operating cash flows attributable to the assets. An impairment loss is recorded if the net carrying value of the assets exceeds the undiscounted future net operating cash flows attributable to the assets. The impairment loss recognized equals the excess of net carrying value over the related fair value of the assets.

When real estate assets are identified by management as held for sale, the Company discontinues depreciating the assets and estimates the fair value of the assets, net of selling costs. If the estimated fair value, net of selling costs, of the assets that have been identified as held for sale is less than the net carrying value of the assets, the Company would recognize an impairment loss on the assets held for sale. The operations of assets held for sale or sold during the period are presented as part of normal operations for all periods presented. As of September 30, 2017, the Company had one parcel of undeveloped land and 36 operating stores classified as held for sale. The estimated fair value less selling costs of each of these operating stores is greater than the carrying value of the assets, and therefore no loss has been recorded related to the operating stores held for sale. For the nine months ended September 30, 2017, the Company recorded an impairment loss of $6,100 relating to one parcel of land held for sale and an additional two parcels of undeveloped land where the carrying value was greater than the fair value.

The Company assesses whether there are any indicators that the value of the Company’s investments in unconsolidated real estate ventures may be impaired annually and when events or circumstances indicate that there may be impairment. An investment is impaired if management’s estimate of the fair value of the investment is less than its carrying value. To the extent impairment has occurred, and is considered to be other than temporary, the loss is measured as the excess of the carrying amount of the investment over the fair value of the investment.

In connection with the Company’s acquisition of stores, the purchase price is allocated to the tangible and intangible assets and liabilities acquired based on their relative fair values, which are estimated using significant unobservable inputs. The value of the tangible assets, consisting of land and buildings, is determined as if vacant. Intangible assets, which represent the value of existing tenant relationships, are recorded at their fair values based on the avoided cost to replace the current leases. The Company measures the value of tenant relationships based on the rent lost due to the amount of time required to replace existing customers, which is based on the Company’s historical experience with turnover in its stores. Debt assumed as part of an acquisition is recorded at fair value based on current interest rates compared to contractual rates. Acquisition-related transaction costs, for those qualifying as asset acquisitions, are capitalized as a component of the cost of the assets acquired.

Fair Value of Financial Instruments

The carrying values of cash and cash equivalents, restricted cash, receivables, other financial instruments included in other assets, accounts payable and accrued expenses, variable-rate notes payable, lines of credit and other liabilities reflected in the condensed consolidated balance sheets at September 30, 2017 and December 31, 2016 approximate fair value.

The fair values of the Company’s notes receivable from Preferred Operating Partnership unit holders and other fixed rate notes receivable were based on the discounted estimated future cash flows of the notes (categorized within Level 3 of the fair value hierarchy); the discount rate used approximated the current market rate for loans with similar maturities and credit quality. The fair values of the Company’s fixed-rate notes payable and notes payable to trusts were estimated using the discounted estimated future cash payments to be made on such debt (categorized within Level 3 of the fair value hierarchy); the discount rates used approximated current market rates for loans, or groups of loans, with similar maturities and credit quality. The fair value of the Company’s exchangeable senior notes was estimated using an average market price for similar securities obtained from a third party.

Earnings Per Common Share

EARNINGS PER COMMON SHARE

Basic earnings per common share is computed using the two-class method by dividing net income attributable to common stockholders by the weighted average number of common shares outstanding during the period. All outstanding unvested restricted stock awards contain rights to non-forfeitable dividends and participate in undistributed earnings with common stockholders; accordingly, they are considered participating securities that are included in the two-class method. Diluted earnings per common share measures the performance of the Company over the reporting period while giving effect to all potential common shares that were dilutive and outstanding during the period. The denominator includes the weighted average number of basic shares and the number of additional common shares that would have been outstanding if the potential common shares that were dilutive had been issued, and is calculated using either the two-class, treasury stock or as if-converted method, whichever is most dilutive. Potential common shares are securities (such as options, convertible debt, Series A Participating Redeemable Preferred Units (“Series A Units”), Series B Redeemable Preferred Units (“Series B Units”), Series C Convertible Redeemable Preferred Units (“Series C Units”), Series D Redeemable Preferred Units (“Series D Units”) and common Operating Partnership units (“OP Units”)) that do not have a current right to participate in earnings of the Company but could do so in the future by virtue of their option, redemption or conversion right.

In computing the dilutive effect of convertible securities, net income is adjusted to add back any changes in earnings in the period associated with the convertible security. The numerator also is adjusted for the effects of any other non-discretionary changes in income or loss that would result from the assumed conversion of those potential common shares. In computing diluted earnings per common share, only potential common shares that are dilutive (those that reduce earnings per common share) are included.

Derivatives

The Company is exposed to certain risks arising from both its business operations and economic conditions. The Company principally manages its exposures to a wide variety of business and operational risks through management of its core business activities. The Company manages economic risks, including interest rate, liquidity and credit risk, primarily by managing the amount, sources and duration of its debt funding and by using derivative financial instruments. Specifically, the Company enters into derivative financial instruments to manage exposure that arises from business activities that result in the receipt or payment of future known and uncertain cash amounts, the value of which are determined by interest rates. The Company’s derivative financial instruments are used to manage differences in the amount, timing and duration of the Company’s known or expected cash receipts and its known or expected cash payments principally related to the Company’s investments and borrowings.

Convertible Debt

GAAP requires entities with convertible debt instruments that may be settled entirely or partially in cash upon conversion to separately account for the liability and equity components of the instrument in a manner that reflects the issuer’s economic interest cost. The Company therefore accounts for the liability and equity components of the 2013 Notes and 2015 Notes separately. The equity components are included in paid-in capital in stockholders’ equity in the condensed consolidated balance sheets, and the value of the equity components are treated as original issue discount for purposes of accounting for the debt components. The discounts are being amortized as interest expense over the remaining period of the debt through its first redemption date: July 1, 2018 for the 2013 Notes, and October 1, 2020 for the 2015 Notes. The effective interest rate on the liability components of both the 2013 Notes and the 2015 Notes is 4.0%, which approximated the market rate of interest of similar debt without exchange features (i.e. nonconvertible debt) at the time of issuance.

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Fair Value Disclosures (Tables)

9 Months Ended

Sep. 30, 2017

Fair Value Disclosures [Abstract]

Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis

The table below presents the Company’s assets and liabilities measured at fair value on a recurring basis as of September 30, 2017, aggregated by the level in the fair value hierarchy within which those measurements fall. 

				Fair Value Measurements at Reporting Date Using
Description	September 30, 2017			Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)			Significant Unobservable Inputs (Level 3)
Other assets - Cash Flow Hedge Swap Agreements	$	23,584		$	—	$	23,584		$	—
Other liabilities - Cash Flow Hedge Swap Agreements	$	(1,430	)	$	—	$	(1,430	)	$	—

Schedule of Fair Value of Financial Instruments

The fair values of the Company’s fixed-rate assets and liabilities were as follows for the periods indicated:

	September 30, 2017				December 31, 2016
	Fair Value		Carrying Value		Fair Value		Carrying Value
Notes receivable from Preferred Operating Partnership unit holders	$	114,506	$	120,230	$	125,642	$	120,230
Fixed rate notes receivable	$	21,285	$	20,608	$	53,450	$	52,201
Fixed rate notes payable and notes payable to trusts	$	2,882,709	$	2,900,822	$	2,404,996	$	2,417,558
Exchangeable senior notes	$	702,118	$	624,384	$	706,827	$	638,170

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Earnings Per Common Share (Tables)

9 Months Ended

Sep. 30, 2017

Earnings Per Share [Abstract]

Schedule of Antidilutive Shares Excluded from Computation of Earnings Per Share

The following table presents the number of Preferred Operating Partnership units, and the potential common shares, that were excluded from the computation of earnings per share as their effect would have been anti-dilutive.

	For the Three Months Ended September 30,		For the Nine Months Ended September 30,
	2017	2016	2017	2016
	Equivalent Shares (if converted)	Equivalent Shares (if converted)	Equivalent Shares (if converted)	Equivalent Shares (if converted)
Series B Units	538,312	496,412	546,526	480,419
Series C Units	380,769	351,132	386,580	339,820
Series D Units	1,126,831	—	1,091,319	417,420
	2,045,912	847,544	2,024,425	1,237,659

Schedule of Computation of Earnings Per Common Share

The computation of earnings per common share was as follows for the periods presented:

	For the Three Months Ended September 30,						For the Nine Months Ended September 30,
	2017			2016			2017			2016
Net income attributable to common stockholders	$	93,764		$	118,088		$	263,052		$	283,724
Earnings and dividends allocated to participating securities	(191		)	(248		)	(595		)	(616		)
Earnings for basic computations	93,573			117,840			262,457			283,108
Earnings and dividends allocated to participating securities	191			—			595			—
Income allocated to noncontrolling interest - Preferred Operating Partnership (Series A Units) and Operating Partnership	5,163			7,776			15,448			17,926
Fixed component of income allocated to noncontrolling interest - Preferred Operating Partnership (Series A Units)	(572		)	(1,271		)	(2,547		)	(3,814		)
Net income for diluted computations	$	98,355		$	124,345		$	275,953		$	297,220
Weighted average common shares outstanding:
Average number of common shares outstanding - basic	125,717,517			125,752,291			125,665,787			125,244,761
OP Units	5,590,231			5,534,350			5,586,908			5,557,723
Series A Units	875,480			875,480			875,480			875,480
Series D Units	—			814,435			—			—
Unvested restricted stock awards included for treasury stock method	280,484			—			288,831			—
Shares related to exchangeable senior notes and dilutive stock options	580,761			786,916			591,616			798,727
Average number of common shares outstanding - diluted	133,044,473			133,763,472			133,008,622			132,476,691
Earnings per common share
Basic	$	0.74		$	0.94		$	2.09		$	2.26
Diluted	$	0.74		$	0.93		$	2.07		$	2.24

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Store Acquisitions and Dispositions (Tables)

9 Months Ended

Sep. 30, 2017

Business Combinations [Abstract]

Schedule of Operating Properties Acquired

The following table shows the Company’s acquisitions of operating stores for the nine months ended September 30, 2017. The table excludes purchases of raw land or improvements made to existing assets.

					Consideration Paid												Total
Property Location	Number of Stores	Date of Acquisition	Total		Cash Paid		Loan Assumed		Non- controlling interests		Net Liabilities/(Assets) Assumed			Value of OP Units Issued		Number of OP Units Issued	Real estate assets
Georgia	1	9/1/2017	$	4,246	$	4,220	$	—	$	—	$	26		$	—	—	$	4,246
Florida	1	8/4/2017	9,047		7,058		—		—		(11		)	2,000		25,520	9,047
North Carolina	1	7/13/2017	8,422		8,426		—		—		(4		)	—		—	8,422
Virginia	1	7/13/2017	10,251		10,215		—		—		36			—		—	10,251
Florida	1	6/12/2017	11,100		4,270		—		—		20			6,810		272,400	11,100
Florida	1	4/25/2017	7,377		7,400		—		—		(23		)	—		—	7,377
Pennsylvania	1	4/11/2017	16,164		4,938		9,463		1,827		(64		)	—		—	16,164
Illinois	1	2/1/2017	9,028		9,020		—		—		8			—		—	9,028
Georgia	1	1/6/2017	16,528		16,521		—		—		7			—		—	16,528
2017 Totals	9		$	92,163	$	72,068	$	9,463	$	1,827	$	(5	)	$	8,810	297,920	$	92,163

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Variable Interests (Tables)

9 Months Ended

Sep. 30, 2017

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Schedule of Assets and Liabilities and Maximum Exposure to Loss Related to Trusts

Following is a tabular comparison of the assets and liabilities the Company has recorded as a result of its involvement with the Trusts to the maximum exposure to loss the Company is subject to as a result of such involvement as of September 30, 2017:

	Notes payable to Trusts			Investment Balance		Maximum exposure to loss		Difference
Trust	$	36,083		$	1,083	$	35,000	$	—
Trust II	42,269			1,269		41,000		—
Trust III	41,238			1,238		40,000		—
	119,590			$	3,590	$	116,000	—
Unamortized debt issuance costs	(2,176		)
	$	117,414

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Derivatives (Tables)

9 Months Ended

Sep. 30, 2017

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Schedule of Balance Sheet Classification and Fair Value of Entity's Derivative Financial Instruments

The table below presents the fair value of the Company’s derivative financial instruments as well as their classification on the condensed consolidated balance sheets:

	Asset (Liability) Derivatives
	September 30, 2017			December 31, 2016
Derivatives designated as hedging instruments:	Fair Value
Other assets	$	23,584		$	23,844
Other liabilities	$	(1,430	)	$	(2,447	)

Schedule of Information Relating to Gain (Loss) Recognized on Swap Agreements

The tables below present the effect of the Company’s derivative financial instruments on the condensed consolidated statements of operations for the periods presented. No tax effect has been presented as the derivative instruments are held by the Company:

	Gain (loss) recognized in OCI For the Three Months Ended September 30,					Location of amounts reclassified from OCI into income	Gain (loss) reclassified from OCI For the Three Months Ended September 30,
Type	2017			2016			2017			2016
Swap Agreements	$	(787	)	$	8,451	Interest expense	$	(1,572	)	$	(4,926	)

	Gain (loss) recognized in OCI For the Nine Months Ended September 30,						Location of amounts reclassified from OCI into income	Gain (loss) reclassified from OCI For the Nine Months Ended September 30,
Type	2017			2016				2017			2016
Swap Agreements	$	(6,474	)	$	(50,165	)	Interest expense	$	(7,497	)	$	(14,240	)

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Exchangeable Senior Notes (Tables)

9 Months Ended

Sep. 30, 2017

Debt Disclosure [Abstract]

Schedule of Information about Total Carrying Amounts of Equity Components, Principal Amounts of Liability Components, Unamortized Discounts and Net Carrying Amounts for Notes

Information about the Company’s 2013 Notes and 2015 Notes, including the total carrying amounts of the equity components, the principal amounts of the liability components, the unamortized discounts and the net carrying amounts was as follows for the periods indicated:

	September 30, 2017			December 31, 2016
Carrying amount of equity component - 2013 Notes	$	—		$	—
Carrying amount of equity component - 2015 Notes	22,597			22,597
Carrying amount of equity components	$	22,597		$	22,597
Principal amount of liability component - 2013 Notes	$	49,384		$	63,170
Principal amount of liability component - 2015 Notes	575,000			575,000
Unamortized discount - equity component - 2013 Notes	(475		)	(1,187		)
Unamortized discount - equity component - 2015 Notes	(14,091		)	(17,355		)
Unamortized cash discount - 2013 Notes	(110		)	(281		)
Unamortized debt issuance costs	(7,223		)	(9,033		)
Net carrying amount of liability components	$	602,485		$	610,314

Summary of Amount of Interest Cost Recognized Relating to Contractual Interest Rates and Amortization of Discounts on Liability Components of Notes

The amount of interest cost recognized relating to the contractual interest rates and the amortization of the discounts on the liability components of the Notes were as follows for the periods indicated:

	For the Three Months Ended September 30,				For the Nine Months Ended September 30,
	2017		2016		2017		2016
Contractual interest	$	4,785	$	4,867	$	14,519	$	14,616
Amortization of discount	1,268		1,243		3,827		3,716
Total interest expense recognized	$	6,053	$	6,110	$	18,346	$	18,332

Summary of Repurchase of Debt

Information about the repurchases is as follows:

	July/August 2017
Principal amount repurchased	$	13,786
Amount allocated to:
Extinguishment of liability component	$	13,568
Reacquisition of equity component	6,285
Total consideration paid for repurchase	$	19,853
Exchangeable senior notes repurchased	$	13,786
Extinguishment of liability component	(13,568		)
Discount on exchangeable senior notes	(183		)
Related debt issuance costs	(35		)
Gain/(loss) on repurchase	$	—

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Segment Information (Tables)

9 Months Ended

Sep. 30, 2017

Segment Reporting [Abstract]

Schedule of Financial Information of Business Segments

Financial information for the Company’s business segments is presented below:

	September 30, 2017		December 31, 2016
Balance Sheet
Investment in unconsolidated real estate ventures
Rental operations	$	78,512	$	79,570
Total assets
Rental operations	$	6,728,499	$	6,731,292
Tenant reinsurance	42,786		44,524
Property management, acquisition and development	315,670		315,630
	$	7,086,955	$	7,091,446

	For the Three Months Ended September 30,						For the Nine Months Ended September 30,
	2017			2016			2017			2016
Statement of Operations
Total revenues
Rental operations	$	248,589		$	224,451		$	720,878		$	635,730
Tenant reinsurance	25,882			22,727			73,050			64,936
Property management, acquisition and development	9,685			10,005			29,239			30,193
	284,156			257,183			823,167			730,859
Operating expenses, including depreciation and amortization
Rental operations	115,162			106,530			341,191			312,389
Tenant reinsurance	6,272			4,093			13,996			12,345
Property management, acquisition and development	22,841			23,836			67,489			79,471
	144,275			134,459			422,676			404,205
Income (loss) from operations
Rental operations	133,427			117,921			379,687			323,341
Tenant reinsurance	19,610			18,634			59,054			52,591
Property management, acquisition and development	(13,156		)	(13,831		)	(38,250		)	(49,278		)
	139,881			122,724			400,491			326,654
Gain (loss) on real estate transactions, earnout from prior acquisition and impairment of real estate
Property management, acquisition and development	—			—			(6,019		)	9,814
Interest expense
Rental operations	(38,379		)	(32,619		)	(109,414		)	(95,125		)
Property management, acquisition and development	(1,387		)	(875		)	(3,778		)	(2,530		)
	(39,766		)	(33,494		)	(113,192		)	(97,655		)
Non-cash interest expense related to the amortization of discount on equity component of exchangeable senior notes
Property management, acquisition and development	(1,268		)	(1,243		)	(3,827		)	(3,716		)
Interest income
Property management, acquisition and development	869			1,358			2,797			4,697
Interest income on note receivable from Preferred Operating Partnership unit holder
Property management, acquisition and development	532			1,213			2,404			3,638
Equity in earnings of unconsolidated real estate ventures
Rental operations	3,990			3,625			11,407			9,813
Equity in earnings of unconsolidated real estate ventures - gain on sale of real estate assets and purchase of joint venture partners' interests
Property management, acquisition and development	—			37,509			—			64,432
Income tax (expense) benefit
Rental operations	(834		)	(550		)	(1,759		)	(1,840		)
Tenant reinsurance	(3,572		)	(3,504		)	(10,701		)	(9,352		)
Property management, acquisition and development	1,243			(412		)	3,306			188
	(3,163		)	(4,466		)	(9,154		)	(11,004		)
Net income (loss)
Rental operations	98,204			88,377			279,921			236,189
Tenant reinsurance	16,038			15,130			48,353			43,239
Property management, acquisition and development	(13,167		)	23,719			(43,367		)	27,245
	$	101,075		$	127,226		$	284,907		$	306,673

	For the Three Months Ended September 30,				For the Nine Months Ended September 30,
	2017		2016		2017			2016
Depreciation and amortization expense
Rental operations	$	44,732	$	44,189	$	136,821		$	126,506
Property management, acquisition and development	3,343		2,366		7,318			6,896
	$	48,075	$	46,555	$	144,139		$	133,402
Statement of Cash Flows
Acquisition of real estate assets
Property management, acquisition and development					$	(119,040	)	$	(763,246	)
Development and redevelopment of real estate assets
Property management, acquisition and development					$	(20,670	)	$	(18,492	)

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Organization - Additional Information (Detail)	9 Months Ended
	Sep. 30, 2017 segment store state
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Number of operating storage facilities in which the entity has equity interests (in stores)	1,028
Number of stores owned by franchisees and third parties	485
Number of operating stores owned and/or managed	1,513
Number of states in which operating storage facilities are located | state	38
Number of reportable segments | segment	3
Rental Revenue [Member] | Customer Concentration Risk [Member]
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Percentage of rental income accounted for by any single tenant (no more than)	5.00%

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Fair Value Disclosures - Schedule of Assets and Liabilities Measured at Fair Value on a Recurring Basis (Detail) - Recurring Basis [Member] $ in Thousands	Sep. 30, 2017 USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other assets - Cash Flow Hedge Swap Agreements	$ 23,584
Other liabilities - Cash Flow Hedge Swap Agreements	(1,430)
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other assets - Cash Flow Hedge Swap Agreements	0
Other liabilities - Cash Flow Hedge Swap Agreements	0
Significant Other Observable Inputs (Level 2) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other assets - Cash Flow Hedge Swap Agreements	23,584
Other liabilities - Cash Flow Hedge Swap Agreements	(1,430)
Significant Unobservable Inputs (Level 3) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other assets - Cash Flow Hedge Swap Agreements	0
Other liabilities - Cash Flow Hedge Swap Agreements	$ 0

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Fair Value Disclosures - Schedule of Fair Value of Financial Instruments (Detail) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Fair Value of Financial Instruments [Line Items]
Notes receivable from Preferred Operating Partnership unit holders	$ 120,230	$ 120,230
Fixed rate notes payable and notes payable to trusts	3,568,113	3,213,588
Exchangeable senior notes	602,485	610,314
Fair Value [Member]
Fair Value of Financial Instruments [Line Items]
Notes receivable from Preferred Operating Partnership unit holders	114,506	125,642
Fixed rate notes receivable	21,285	53,450
Fixed rate notes payable and notes payable to trusts	2,882,709	2,404,996
Exchangeable senior notes	702,118	706,827
Carrying Value [Member]
Fair Value of Financial Instruments [Line Items]
Notes receivable from Preferred Operating Partnership unit holders	120,230	120,230
Fixed rate notes receivable	20,608	52,201
Fixed rate notes payable and notes payable to trusts	2,900,822	2,417,558
Exchangeable senior notes	$ 624,384	$ 638,170

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Fair Value Disclosures - Additional Information (Detail) $ in Thousands	9 Months Ended
	Sep. 30, 2017 USD ($) land_parcel store parcel
Fair Value Disclosures [Abstract]
Number of parcels of undeveloped land classified as held for sale | land_parcel	1
Number of operating stores held for sale | store	36
Impairment loss on parcels of land held for sale | $	$ 6,100
Number of parcels of undeveloped land impaired	2
Number of parcels of land impaired	1

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Earnings Per Common Share - Schedule of Antidilutive Shares Excluded from Computation of Earnings Per Share (Detail) - shares	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Equivalent shares (if converted) (in shares)	2,045,912	847,544	2,024,425	1,237,659
Series B Units [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Equivalent shares (if converted) (in shares)	538,312	496,412	546,526	480,419
Series C Units [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Equivalent shares (if converted) (in shares)	380,769	351,132	386,580	339,820
Series D Units [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Equivalent shares (if converted) (in shares)	1,126,831	0	1,091,319	417,420

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Earnings Per Common Share - Schedule of Computation of Earnings Per Common Share (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Class of Stock [Line Items]
Net income attributable to common stockholders	$ 93,764	$ 118,088	$ 263,052	$ 283,724
Earnings and dividends allocated to participating securities	(191)	(248)	(595)	(616)
Earnings for basic computations	93,573	117,840	262,457	283,108
Earnings and dividends allocated to participating securities	191	0	595	0
Income allocated to noncontrolling interest - Preferred Operating Partnership (Series A Units) and Operating Partnership	5,163	7,776	15,448	17,926
Fixed component of income allocated to noncontrolling interest - Preferred Operating Partnership (Series A Units)	(572)	(1,271)	(2,547)	(3,814)
Net income for diluted computations	$ 98,355	$ 124,345	$ 275,953	$ 297,220
Weighted average common shares outstanding:
Average number of common shares outstanding - basic (in shares)	125,717,517	125,752,291	125,665,787	125,244,761
OP Units (in shares)	5,590,231	5,534,350	5,586,908	5,557,723
Unvested restricted stock awards included for treasure stock method	280,484	0	288,831	0
Shares related to exchangeable senior notes and dilutive stock options (in shares)	580,761	786,916	591,616	798,727
Average number of common shares outstanding - diluted (in shares)	133,044,473	133,763,472	133,008,622	132,476,691
Earnings per common share
Basic (in dollars per share)	$ 0.74	$ 0.94	$ 2.09	$ 2.26
Diluted (in dollars per share)	$ 0.74	$ 0.93	$ 2.07	$ 2.24
Series A Units [Member]
Weighted average common shares outstanding:
Preferred series units (in shares)	875,480	875,480	875,480	875,480
Series D Units [Member]
Weighted average common shares outstanding:
Preferred series units (in shares)	0	814,435	0	0

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Earnings Per Common Share - Additional Information (Detail) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Aug. 31, 2017	Dec. 31, 2016	Sep. 30, 2015	Jun. 21, 2013
Earnings Per Share [Line Items]
Average share price (in dollars per share)	$ 77.84	$ 84.41	$ 76.67	$ 87.22
Principal amount of notes outstanding	$ 602,485,000		$ 602,485,000			$ 610,314,000
Operating Partnership [Member] | Exchangeable Senior Notes 2.375% due 2033 (the 2013 Notes) [Member]
Earnings Per Share [Line Items]
Principal amount of notes outstanding	$ 49,384,000		$ 49,384,000		$ 13,786,000	63,170,000
Debt stated interest rate	2.375%		2.375%					2.375%
Exchange price (in dollars per share)	$ 53.28		$ 53.28
Shares related to the Notes included in the computation for diluted earnings per share (in shares)	292,439	413,498	292,439	413,498
Operating Partnership [Member] | Exchangeable Senior Notes 3.125% due 2035 (the 2015 Notes) [Member]
Earnings Per Share [Line Items]
Principal amount of notes outstanding	$ 575,000,000		$ 575,000,000			$ 575,000,000
Debt stated interest rate	3.125%		3.125%				3.125%
Exchange price (in dollars per share)	$ 94.01		$ 94.01
Shares related to the Notes included in the computation for diluted earnings per share (in shares)	0	0	0	0
Stock Options [Member]
Earnings Per Share [Line Items]
Anti-dilutive securities excluded from computation of earnings per common share (in shares)	45,438	95,031	97,697	84,919
Series A Units [Member]
Earnings Per Share [Line Items]
Exchangeable preferred operating partnership units settled in cash, minimum	$ 115,000,000		$ 115,000,000

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Store Acquisitions and Dispositions - Schedule of Operating Properties Acquired (Detail)						9 Months Ended
	Sep. 13, 2017 USD ($)	Jun. 12, 2017 USD ($) shares	Jul. 26, 2016 USD ($) store	Apr. 20, 2016 USD ($) store	Apr. 01, 2016 USD ($) shares	Sep. 30, 2017 USD ($) store shares	Sep. 30, 2016 USD ($)	Dec. 31, 2014 store
Property Acquisitions [Line Items]
Cash paid						$ 119,040,000	$ 763,246,000
Proceeds from sale of real estate assets, investments in real estate ventures and other assets						$ 18,565,000	56,786,000
Georgia Property 9/1/2017 [Member]
Property Acquisitions [Line Items]
Number of Stores | store						1
Total						$ 4,246,000
Cash paid						4,220,000
Loan Assumed						0
Non- controlling interests						0.00
Net Liabilities/(Assets) Assumed						26,000
Value of OP Units Issued						$ 0
Number of OP Units Issued (in shares) | shares						0
Real estate assets						$ 4,246,000
Florida Property 8/4/2017 [Member]
Property Acquisitions [Line Items]
Number of Stores | store						1
Total						$ 9,047,000
Cash paid						7,058,000
Loan Assumed						0
Non- controlling interests						0.00
Net Liabilities/(Assets) Assumed						(11,000)
Value of OP Units Issued						$ 2,000,000
Number of OP Units Issued (in shares) | shares						25,520
Real estate assets						$ 9,047,000
North Carolina Property 7/13/2017 [Member]
Property Acquisitions [Line Items]
Number of Stores | store						1
Total						$ 8,422,000
Cash paid						8,426,000
Loan Assumed						0
Non- controlling interests						0.00
Net Liabilities/(Assets) Assumed						(4,000)
Value of OP Units Issued						$ 0
Number of OP Units Issued (in shares) | shares						0
Real estate assets						$ 8,422,000
Virginia Property 7/13/2017 [Member]
Property Acquisitions [Line Items]
Number of Stores | store						1
Total						$ 10,251,000
Cash paid						10,215,000
Loan Assumed						0
Non- controlling interests						0.00
Net Liabilities/(Assets) Assumed						36,000
Value of OP Units Issued						$ 0
Number of OP Units Issued (in shares) | shares						0
Real estate assets						$ 10,251,000
Florida Property 6/12/2017 [Member]
Property Acquisitions [Line Items]
Number of Stores | store						1
Total						$ 11,100,000
Cash paid		$ 4,270,000
Loan Assumed						0
Non- controlling interests						0
Net Liabilities/(Assets) Assumed						20,000
Value of OP Units Issued		$ 6,810,000
Number of OP Units Issued (in shares) | shares		272,400
Real estate assets						$ 11,100,000
Florida Property 4/25/2017 [Member]
Property Acquisitions [Line Items]
Number of Stores | store						1
Total						$ 7,377,000
Cash paid						7,400,000
Loan Assumed						0
Non- controlling interests						0.00
Net Liabilities/(Assets) Assumed						(23,000)
Value of OP Units Issued						$ 0
Number of OP Units Issued (in shares) | shares						0
Real estate assets						$ 7,377,000
Pennsylvania Property 3/11/2017 [Member]
Property Acquisitions [Line Items]
Number of Stores | store						1
Total						$ 16,164,000
Cash paid						4,938,000
Loan Assumed						9,463,000
Non- controlling interests						1,827,000
Net Liabilities/(Assets) Assumed						(64,000)
Value of OP Units Issued						$ 0
Number of OP Units Issued (in shares) | shares						0
Real estate assets						$ 16,164,000
Illinois Property 2/1/2017 [Member]
Property Acquisitions [Line Items]
Number of Stores | store						1
Total						$ 9,028,000
Cash paid						9,020,000
Loan Assumed						0
Non- controlling interests						0
Net Liabilities/(Assets) Assumed						8,000
Value of OP Units Issued						$ 0
Number of OP Units Issued (in shares) | shares						0
Real estate assets						$ 9,028,000
Georgia Property 1/6/2017 [Member]
Property Acquisitions [Line Items]
Number of Stores | store						1
Total						$ 16,528,000
Cash paid						16,521,000
Loan Assumed						0
Non- controlling interests						0
Net Liabilities/(Assets) Assumed						7,000
Value of OP Units Issued						$ 0
Number of OP Units Issued (in shares) | shares						0
Real estate assets						$ 16,528,000
Property Acquired In 2017 [Member]
Property Acquisitions [Line Items]
Number of Stores | store						9
Total						$ 92,163,000
Cash paid						72,068,000
Loan Assumed						9,463,000
Non- controlling interests						1,827,000
Net Liabilities/(Assets) Assumed						(5,000)
Value of OP Units Issued						$ 8,810,000
Number of OP Units Issued (in shares) | shares						297,920
Real estate assets						$ 92,163,000
New Jersey And Virginia Five Stores Acquired In Two Thousand And Fourteen [Member]
Property Acquisitions [Line Items]
Number of stores acquired | store								5
Increase in payments due to sellers							$ 1,544,000
Disposal of New York Land, September 13, 2017 [Member] | Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member]
Property Acquisitions [Line Items]
Proceeds from sale of real estate assets, investments in real estate ventures and other assets	$ 19,000,000
Gain (loss) on disposition of assets	$ 0
Disposal Of Indiana Store, July 26,2016 [Member] | Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member]
Property Acquisitions [Line Items]
Proceeds from sale of real estate assets, investments in real estate ventures and other assets			$ 4,447,000
Number of stores sold | store			1
Gain (loss) on disposition of assets			$ 0
Disposal Of Ohio And Indiana Stores, April 20, 2016 [Member] | Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member]
Property Acquisitions [Line Items]
Proceeds from sale of real estate assets, investments in real estate ventures and other assets				$ 17,555,000
Number of stores sold | store				7
Gain (loss) on disposition of assets				$ 11,265,000
Disposal Of Texas Store, April 1, 2016 [Member] | Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member]
Property Acquisitions [Line Items]
Partner capital units (in units) | shares					85,452
Operating Partnership unit value					$ 7,689,000
Gain (loss) on disposition of assets					$ 93,000

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Variable Interests - Schedule of Assets and Liabilities and Maximum Exposure to Loss Related to Trusts (Detail) - Operating Partnership [Member] - USD ($)	Sep. 30, 2017	Dec. 31, 2016
Variable Interest Entity [Line Items]
Unamortized debt issuance costs	$ (7,223,000)	$ (9,033,000)
Net carrying amount of liability components	602,485,000	$ 610,314,000
Variable Interest Entity, Not Primary Beneficiary [Member]
Variable Interest Entity [Line Items]
Investment Balance	3,590,000
Maximum exposure to loss	116,000,000
Difference	0
Variable Interest Entity, Not Primary Beneficiary [Member] | Notes Payable to Trusts [Member]
Variable Interest Entity [Line Items]
Notes payable to Trusts	119,590,000
Unamortized debt issuance costs	(2,176,000)
Net carrying amount of liability components	117,414,000
Variable Interest Entity, Not Primary Beneficiary [Member] | Trust I [Member]
Variable Interest Entity [Line Items]
Investment Balance	1,083,000
Maximum exposure to loss	35,000,000
Difference	0
Variable Interest Entity, Not Primary Beneficiary [Member] | Trust I [Member] | Notes Payable to Trusts [Member]
Variable Interest Entity [Line Items]
Notes payable to Trusts	36,083,000
Variable Interest Entity, Not Primary Beneficiary [Member] | Trust II [Member]
Variable Interest Entity [Line Items]
Investment Balance	1,269,000
Maximum exposure to loss	41,000,000
Difference	0
Variable Interest Entity, Not Primary Beneficiary [Member] | Trust II [Member] | Notes Payable to Trusts [Member]
Variable Interest Entity [Line Items]
Notes payable to Trusts	42,269,000
Variable Interest Entity, Not Primary Beneficiary [Member] | Trust III [Member]
Variable Interest Entity [Line Items]
Investment Balance	1,238,000
Maximum exposure to loss	40,000,000
Difference	0
Variable Interest Entity, Not Primary Beneficiary [Member] | Trust III [Member] | Notes Payable to Trusts [Member]
Variable Interest Entity [Line Items]
Notes payable to Trusts	$ 41,238,000

XML

Variable Interests - Additional Information (Detail)	Sep. 30, 2017 joint_venture subsidiary
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Number of wholly-owned unconsolidated subsidiaries | subsidiary	3
Number of interests in consolidated VIE joint ventures | joint_venture	0

XML

Derivatives - Schedule of Balance Sheet Classification and Fair Value of Entity's Derivative Financial Instruments (Detail) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Other Assets [Member]
Derivative [Line Items]
Other assets	$ 23,584	$ 23,844
Other Liabilities [Member]
Derivative [Line Items]
Other liabilities	$ (1,430)	$ (2,447)

XML

Derivatives - Schedule of Information Relating to Gain (Loss) Recognized on Swap Agreements (Detail) - Cash Flow Hedging [Member] - Interest Rate Swap [Member] - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Derivative [Line Items]
Swap agreements gain (loss) recognized in OCI	$ (787)	$ 8,451	$ (6,474)	$ (50,165)
Swap agreements gain (loss) reclassified from OCI - Interest expense	$ (1,572)	$ (4,926)	$ (7,497)	$ (14,240)

XML

Derivatives - Additional Information (Detail) $ in Thousands	Sep. 30, 2017 USD ($) derivative
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Estimated amount of unrealized gains or losses expected to be reclassified as interest expense in next fiscal year	$ 1,513
Number of derivative financial instruments | derivative	30
Combined notional amount	$ 2,255,018
Credit risk derivative, fair value of derivatives in a net liability position	1,257
Estimated termination value on settlement	$ 1,620

XML

Exchangeable Senior Notes - Schedule of Information about Total Carrying Amounts of Equity Components, Principal Amounts of Liability Components, Unamortized Discounts and Net Carrying Amounts for Notes (Detail) - USD ($) $ in Thousands	Sep. 30, 2017	Aug. 31, 2017	Dec. 31, 2016	Sep. 30, 2015	Jun. 21, 2013
Debt Instrument [Line Items]
Principal amount of liability components	$ 602,485		$ 610,314
Operating Partnership [Member]
Debt Instrument [Line Items]
Carrying amount of equity components	22,597		22,597
Unamortized debt issuance costs	(7,223)		(9,033)
Net carrying amount of liability components	602,485		610,314
Operating Partnership [Member] | Exchangeable Senior Notes 2.375% due 2033 (the 2013 Notes) [Member]
Debt Instrument [Line Items]
Carrying amount of equity components	0		0
Principal amount of liability components	49,384	$ 13,786	63,170
Unamortized discount - equity components	(475)		(1,187)
Unamortized cash discount - 2013 Notes	(110)	(183)	(281)		$ (3,750)
Unamortized debt issuance costs		$ (35)			$ (1,672)
Operating Partnership [Member] | Exchangeable Senior Notes 3.125% due 2035 (the 2015 Notes) [Member]
Debt Instrument [Line Items]
Carrying amount of equity components	22,597		22,597
Principal amount of liability components	575,000		575,000
Unamortized discount - equity components	$ (14,091)		$ (17,355)
Unamortized debt issuance costs				$ (11,992)

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Exchangeable Senior Notes - Summary of Amount of Interest Cost Recognized Relating to Contractual Interest Rates and Amortization of Discounts on Liability Components of Notes (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Debt Disclosure [Abstract]
Contractual interest	$ 4,785	$ 4,867	$ 14,519	$ 14,616
Amortization of discount	1,268	1,243	3,827	3,716
Total interest expense recognized	$ 6,053	$ 6,110	$ 18,346	$ 18,332

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Exchangeable Senior Notes - Summary of Repurchase of Debt (Detail) - USD ($) $ in Thousands	2 Months Ended	9 Months Ended
	Aug. 31, 2017	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016	Jun. 21, 2013
Debt Instrument [Line Items]
Repayments of debt		$ 1,020,144	$ 565,541
Exchangeable senior notes repurchased		602,485		$ 610,314
Operating Partnership [Member]
Debt Instrument [Line Items]
Unamortized debt issuance costs		(7,223)		(9,033)
Operating Partnership [Member] | Exchangeable Senior Notes 2.375% due 2033 (the 2013 Notes) [Member]
Debt Instrument [Line Items]
Principal amount repurchased	$ 13,786
Extinguishment of liability component	(13,568)
Reacquisition of equity component	6,285
Repayments of debt	19,853
Exchangeable senior notes repurchased	13,786	49,384		63,170
Extinguishment of liability component	(13,568)
Discount on exchangeable senior notes	(183)	$ (110)		$ (281)	$ (3,750)
Unamortized debt issuance costs	(35)				$ (1,672)
Gain/(loss) on repurchase	$ 0

XML

Exchangeable Senior Notes - Additional Information (Detail)		1 Months Ended	2 Months Ended	9 Months Ended
	Jun. 21, 2013 USD ($)	Sep. 30, 2015 USD ($)	Aug. 31, 2017 USD ($)	Sep. 30, 2017 USD ($) d	Sep. 30, 2016 USD ($)	Dec. 31, 2016 USD ($)
Debt Instrument [Line Items]
Repayments of Debt				$ 1,020,144,000	$ 565,541,000
Exchangeable Senior Notes 3.125% due 2035 (the 2015 Notes) [Member]
Debt Instrument [Line Items]
Effective interest rate on the liability component				4.00%
Exchangeable Senior Notes 2.375% due 2033 (the 2013 Notes) [Member]
Debt Instrument [Line Items]
Notes exchange, threshold percentage				130.00%
Notes exchange, threshold trading days | d				20
Notes exchange, threshold consecutive trading days | d				30
Effective interest rate on the liability component				4.00%
Operating Partnership [Member]
Debt Instrument [Line Items]
Related debt issuance costs				$ 7,223,000		$ 9,033,000
Operating Partnership [Member] | Exchangeable Senior Notes 3.125% due 2035 (the 2015 Notes) [Member]
Debt Instrument [Line Items]
Principal amount of notes issued		$ 575,000,000
Debt stated interest rate		3.125%		3.125%
Underwriting fee percentage		2.00%
Amortization period		5 years
Conversion ratio				0.01064
Redemption price as percentage of principal amount of notes plus accrued and unpaid interest		100.00%
Redemption price as percentage of principal amount of notes at request of debt holders and upon occurrence of designated event		100.00%
Related debt issuance costs		$ 11,992,000
Operating Partnership [Member] | Exchangeable Senior Notes 3.125% due 2035 (the 2015 Notes) [Member] | Minimum [Member]
Debt Instrument [Line Items]
Number of days of written notice to holders of notes required for redemption		30 days
Operating Partnership [Member] | Exchangeable Senior Notes 3.125% due 2035 (the 2015 Notes) [Member] | Maximum [Member]
Debt Instrument [Line Items]
Number of days of written notice to holders of notes required for redemption		60 days
Operating Partnership [Member] | Exchangeable Senior Notes 2.375% due 2033 (the 2013 Notes) [Member]
Debt Instrument [Line Items]
Principal amount of notes issued	$ 250,000,000
Debt stated interest rate	2.375%			2.375%
Conversion ratio				0.01877
Redemption price as percentage of principal amount of notes plus accrued and unpaid interest	100.00%
Redemption price as percentage of principal amount of notes at request of debt holders and upon occurrence of designated event	100.00%
Discount rate	1.50%
Unamortized cash discount	$ 3,750,000		$ 183,000	$ 110,000		$ 281,000
Related debt issuance costs	$ 1,672,000		35,000
Amortization period	5 years
Principal amount repurchased			13,786,000
Repayments of Debt			$ 19,853,000
Operating Partnership [Member] | Exchangeable Senior Notes 2.375% due 2033 (the 2013 Notes) [Member] | Minimum [Member]
Debt Instrument [Line Items]
Number of days of written notice to holders of notes required for redemption	30 days
Operating Partnership [Member] | Exchangeable Senior Notes 2.375% due 2033 (the 2013 Notes) [Member] | Maximum [Member]
Debt Instrument [Line Items]
Number of days of written notice to holders of notes required for redemption	60 days

XML

Stockholders' Equity - Additional Information (Detail) - At the Market Equity Distribution Agreement [Member]		3 Months Ended	9 Months Ended
	May 06, 2016 USD ($) sales_agent	Sep. 30, 2017 USD ($) shares	Sep. 30, 2017 USD ($) shares
Changes In Equity And Comprehensive Income Line Items [Line Items]
Aggregate offering price of common share	$ 400,000,000
Number of sales agents | sales_agent	5
Shares, issued | shares		0	0
Value of stock available for issuance under ATM		$ 349,375,000	$ 349,375,000

XML

Noncontrolling Interest Represented by Preferred Operating Partnership Units - Additional Information (Details) $ / shares in Units, $ in Thousands											1 Months Ended	6 Months Ended	9 Months Ended
	Nov. 08, 2016 USD ($) shares	Jun. 15, 2016 USD ($)	Jun. 10, 2016 USD ($) store shares	Oct. 03, 2014 USD ($) shares	Apr. 03, 2014 USD ($) store shares	Nov. 19, 2013 store	Sep. 26, 2013 USD ($) store shares	Aug. 29, 2013 store	Jun. 25, 2007 USD ($) shares	Jun. 15, 2007 store shares	Dec. 31, 2014 USD ($) store shares	May 31, 2014 USD ($) store shares	Sep. 30, 2017 USD ($) shares $ / shares	Sep. 30, 2016 USD ($)	Dec. 31, 2016 USD ($)
Noncontrolling Interest [Line Items]
Note receivable from noncontrolling interest represented by Preferred Operating Partnership units													$ 120,230		$ 120,230
Payments to Acquire Real Estate													119,040	$ 763,246
Redemption of Operating Partnership units held by noncontrolling interests													$ 2,510	$ 0
Series B Redeemable Preferred Units [Member] | Series B Units [Member]
Noncontrolling Interest [Line Items]
Liquidation value (in dollars per share) | $ / shares													$ 25
Fixed liquidation value													$ 41,902
Annual rate of return (as a percent)													6.00%
Series B Redeemable Preferred Units [Member] | Series B Units [Member] | Georgia, 1 Property Acquired 4/3/2014 [Member]
Noncontrolling Interest [Line Items]
Preferred units issued as part of acquisition (in units) | shares					333,360
Preferred units issued as part of acquisition					$ 8,334
Series C Convertible Redeemable Preferred Units [Member] | California, Properties Acquired December 2013 [Member]
Noncontrolling Interest [Line Items]
Number of stores acquired | store						12
Ownership interests in five stores through joint ventures prior to the acquisition												35.00%
Number of stores in which ownership interest was held prior to acquisition of remaining properties | store												5
Ownership interest in one store through joint ventures prior to the acquisition												40.00%
Number of stores in which ownership interest was held prior to acquisition | store												1
Series C Convertible Redeemable Preferred Units [Member] | Series C Units [Member]
Noncontrolling Interest [Line Items]
Note receivable from noncontrolling interest represented by Preferred Operating Partnership units											$ 20,230
Note receivable interest rate											5.00%
Liquidation value (in dollars per share) | $ / shares													$ 42.1
Fixed liquidation value													$ 29,639
Quarterly distribution per preferred OP unit payable above quarterly distribution for common OP Unit (in dollars per share) | $ / shares													$ 0.18
Number of months immediately preceding the fifth anniversary of issuance for which distribution is payable													12 months
Period from date of issuance after which preferred OP units will become redeemable at the option of the holder													1 year
Preferred OP units conversion ratio | shares													0.9145
Note receivable maturity date											Dec. 15, 2024
Series D Redeemable Preferred Units [Member] | Series D Units [Member]
Noncontrolling Interest [Line Items]
Liquidation value (in dollars per share) | $ / shares													$ 25
Fixed liquidation value													$ 87,713
Series D Redeemable Preferred Units [Member] | D-1 Units[Member] | Minimum [Member]
Noncontrolling Interest [Line Items]
Annual rate of return (as a percent)													3.50%
Series D Redeemable Preferred Units [Member] | D-1 Units[Member] | Maximum [Member]
Noncontrolling Interest [Line Items]
Annual rate of return (as a percent)													5.00%
Operating Partnership [Member] | Illinois Property Acquired 5/21/2016 [Member]
Noncontrolling Interest [Line Items]
Number of stores acquired | store			4
Operating Partnership [Member] | Series A Participating Redeemable Preferred Units [Member]
Noncontrolling Interest [Line Items]
Number of stores acquired | store										10
Operating Partnership [Member] | Series A Participating Redeemable Preferred Units [Member] | Series A Units [Member]
Noncontrolling Interest [Line Items]
Preferred units issued as part of acquisition (in units) | shares										989,980
Fixed priority return on preferred OP units, amount		$ 115,000
Fixed priority return on preferred OP units, stated return rate		5.00%											2.25%
Fixed priority return on preferred OP units, liquidation value													$ 115,000
Operating Partnership [Member] | Series B Redeemable Preferred Units [Member] | Georgia, 1 Property Acquired 4/3/2014 [Member]
Noncontrolling Interest [Line Items]
Number of stores acquired | store					1
Cash portion of payment for acquisition					$ 15,158
Operating Partnership [Member] | Series B Redeemable Preferred Units [Member] | California, 20 Properties Acquired 2013-September [Member]
Noncontrolling Interest [Line Items]
Number of stores acquired | store							1	19
Cash portion of payment for acquisition							$ 100,876
Number of stores acquired as part of portfolio acquisition | store								20
Loan Assumed							$ 98,960
Number of common units issued as part of acquisition (in units) | shares							1,448,108
OP units issued as part of the acquisition							$ 62,341
Operating Partnership [Member] | Series B Redeemable Preferred Units [Member] | Series B Units [Member] | California, 20 Properties Acquired 2013-September [Member]
Noncontrolling Interest [Line Items]
Preferred units issued as part of acquisition (in units) | shares							1,342,727
Preferred units issued as part of acquisition							$ 33,568
Operating Partnership [Member] | Series C Convertible Redeemable Preferred Units [Member] | California, Properties Acquired December 2013 [Member]
Noncontrolling Interest [Line Items]
Cash portion of payment for acquisition												$ 45,722
Loan Assumed												$ 37,532
Number of stores acquired | store												6
Operating Partnership [Member] | Series C Convertible Redeemable Preferred Units [Member] | Series C Units [Member] | California, Properties Acquired December 2013 [Member]
Noncontrolling Interest [Line Items]
Preferred units issued as part of acquisition (in units) | shares												704,016
Preferred units issued as part of acquisition												$ 30,960
Operating Partnership [Member] | Series D Redeemable Preferred Units [Member] | Self Storage Facility in Florida [Member]
Noncontrolling Interest [Line Items]
Number of stores acquired | store											1
Cash portion of payment for acquisition											$ 5,621
Operating Partnership [Member] | Series D Redeemable Preferred Units [Member] | D-4 Preferred Units [Member] | Illinois Property Acquired 5/21/2016 [Member]
Noncontrolling Interest [Line Items]
Number of OP units issued for store acquisition (in units) | shares	486,244
Value of OP Units Issued	$ 12,156
Operating Partnership [Member] | Series D Redeemable Preferred Units [Member] | D-3 Units [Member] | Illinois Property Acquired 5/21/2016 [Member]
Noncontrolling Interest [Line Items]
Number of OP units issued for store acquisition (in units) | shares			2,201,467
Value of OP Units Issued			$ 55,037
Operating Partnership [Member] | Series D Redeemable Preferred Units [Member] | Series D Units [Member] | Self Storage Facility in Florida [Member]
Noncontrolling Interest [Line Items]
Preferred units issued as part of acquisition (in units) | shares											548,390
Preferred units issued as part of acquisition											$ 13,710
Operating Partnership Holders of A Units [Member] | Series A Participating Redeemable Preferred Units [Member]
Noncontrolling Interest [Line Items]
Note receivable from noncontrolling interest represented by Preferred Operating Partnership units									$ 100,000
Note receivable interest rate									4.85%				2.13%
Maximum number of preferred OP units converted prior to the maturity date of the loan (in units) | shares									114,500
A units redeemed | shares				114,500
Redemption of Operating Partnership units held by noncontrolling interests				$ 4,794
Common shares issued in Preferred Unit redemption (in shares) | shares				280,331
Additional units redeemed (in units) | shares				0

XML

Noncontrolling Interest in Operating Partnership - Additional Information (Details) $ / shares in Units, $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2017 USD ($) $ / shares shares	Sep. 30, 2017 USD ($) $ / shares shares
Noncontrolling Interest [Line Items]
Period used as a denomination to determine the average closing price of common stock		10 days
OP units conversion basis		one-for-one basis
OP units conversion ratio		1
Ten day average closing stock price (in dollars per share) | $ / shares	$ 79.26	$ 79.26
Consideration to be paid on redemption of common OP units | $	$ 2,510	$ 2,510
Operating Partnership [Member]
Noncontrolling Interest [Line Items]
Ownership interest held by entity	91.10%	91.10%
Ownership percentage in joint venture	8.90%	8.90%
OP units outstanding (in units) | shares	5,599,662	5,599,662
Consideration to be paid on redemption of common OP units | $	$ 443,829	$ 443,829
Number of OP units issued for remaining interest in joint venture (in units) | shares	0	33,896

XML

Other Noncontrolling Interests - Additional Information (Detail) - Other [Member]	Sep. 30, 2017 joint_venture
Noncontrolling Interest [Line Items]
Number of consolidated joint ventures	2
Minimum [Member]
Noncontrolling Interest [Line Items]
Voting interests of third-party owners	20.00%
Maximum [Member]
Noncontrolling Interest [Line Items]
Voting interests of third-party owners	27.00%

XML

Equity in Earnings of Unconsolidated Real Estate Ventures - Gain on Sale of Real Estate and Purchase of Joint Venture Partner's Interest - Additional Information (Detail) $ in Thousands			3 Months Ended	9 Months Ended
	Sep. 16, 2016 USD ($) store	Feb. 02, 2016 USD ($) store	Sep. 30, 2016 store	Sep. 30, 2016 USD ($)
ESS PRISA II LLC Joint Venture [Member]
Schedule Of Results Related To Equity Accounted Investees [Line Items]
Number of stores acquired | store	23
Ownership interest percentage	4.42%
Number of stores owned | store			42
Equity method ownership percentage sold	4.42%
Equity method investment sold	$ 3,912
Equity method investment gain (loss) on disposal	$ 30,846
Extra Space Properties One Three One LLC [Member]
Schedule Of Results Related To Equity Accounted Investees [Line Items]
Number of transferred stores | store	23
Net carrying amount of properties distributed	$ 4,326
Business combination, step acquisition, equity interest in acquiree, including subsequent acquisition, percentage	100.00%
Business combination, step acquisition, equity interest in acquiree, fair value	$ 10,988
Equity interest fair value remeasurement non-cash gain	$ 6,662
Extra Space Properties One Two Two LLC [Member]
Schedule Of Results Related To Equity Accounted Investees [Line Items]
Number of stores acquired | store		6
Number of transferred stores | store		6
Net carrying amount of properties distributed		$ 17,261
Business combination, step acquisition, equity interest in acquiree, including subsequent acquisition, percentage		100.00%
Business combination, step acquisition, equity interest in acquiree, fair value		$ 44,184
Equity interest fair value remeasurement non-cash gain				$ 26,923
VRS [Member]
Schedule Of Results Related To Equity Accounted Investees [Line Items]
Number of stores acquired | store		6
Ownership interest percentage		45.00%
Prudential Real Estate and Affiliates [Member] | ESS PRISA II LLC Joint Venture [Member]
Schedule Of Results Related To Equity Accounted Investees [Line Items]
Business acquisition, percentage of voting interests acquired	95.58%
Proceeds from the sale of equity method investment	$ 34,758
Prudential Real Estate and Affiliates [Member] | Extra Space Properties One Three One LLC [Member]
Schedule Of Results Related To Equity Accounted Investees [Line Items]
Business acquisition, percentage of voting interests acquired	95.58%
Business combination amount paid to acquire joint venture partner's interest	$ 238,679
Prudential Real Estate and Affiliates [Member] | Extra Space Properties One Two Two LLC [Member]
Schedule Of Results Related To Equity Accounted Investees [Line Items]
Business acquisition, percentage of voting interests acquired		55.00%
Business combination amount paid to acquire joint venture partner's interest		$ 53,940
Prudential Real Estate and Affiliates [Member] | VRS [Member]
Schedule Of Results Related To Equity Accounted Investees [Line Items]
Business acquisition, percentage of voting interests acquired		55.00%
Various States Properties Sept16,2016 [Member]
Schedule Of Results Related To Equity Accounted Investees [Line Items]
Real estate assets	$ 248,530
Various States Properties Feb 2, 2016 [Member]
Schedule Of Results Related To Equity Accounted Investees [Line Items]
Real estate assets		$ 98,082

XML

Segment Information - Schedule of Financial Information of Business Segments (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016
Segment Reporting Information [Line Items]
Investment in unconsolidated real estate ventures	$ 78,512		$ 78,512		$ 79,570
Total assets	7,086,955		7,086,955		7,091,446
Total revenues	284,156	$ 257,183	823,167	$ 730,859
Operating expenses, including depreciation and amortization	144,275	134,459	422,676	404,205
Income from operations	139,881	122,724	400,491	326,654
Gain (loss) on real estate transactions, earnout from prior acquisition and impairment of real estate	0	0	(6,019)	9,814
Interest expense	(39,766)	(33,494)	(113,192)	(97,655)
Non-cash interest expense related to amortization of discount on equity component of exchangeable senior notes	(1,268)	(1,243)	(3,827)	(3,716)
Interest income	869	1,358	2,797	4,697
Interest income on note receivable from Preferred Operating Partnership unit holder	532	1,213	2,404	3,638
Equity in earnings of unconsolidated real estate ventures	3,990	3,625	11,407	9,813
Equity in earnings of unconsolidated real estate ventures - gain on sale of real estate assets and purchase of joint venture partners' interests	0	37,509	0	64,432
Income tax (expense) benefit	(3,163)	(4,466)	(9,154)	(11,004)
Net income	101,075	127,226	284,907	306,673
Depreciation and amortization expense	48,075	46,555	144,139	133,402
Acquisition of real estate assets			(119,040)	(763,246)
Development and redevelopment of real estate assets			(20,670)	(18,492)
Rental Operations [Member]
Segment Reporting Information [Line Items]
Investment in unconsolidated real estate ventures	78,512		78,512		79,570
Total assets	6,728,499		6,728,499		6,731,292
Total revenues	248,589	224,451	720,878	635,730
Operating expenses, including depreciation and amortization	115,162	106,530	341,191	312,389
Income from operations	133,427	117,921	379,687	323,341
Interest expense	(38,379)	(32,619)	(109,414)	(95,125)
Equity in earnings of unconsolidated real estate ventures	3,990	3,625	11,407	9,813
Income tax (expense) benefit	(834)	(550)	(1,759)	(1,840)
Net income	98,204	88,377	279,921	236,189
Depreciation and amortization expense	44,732	44,189	136,821	126,506
Tenant Reinsurance [Member]
Segment Reporting Information [Line Items]
Total assets	42,786		42,786		44,524
Total revenues	25,882	22,727	73,050	64,936
Operating expenses, including depreciation and amortization	6,272	4,093	13,996	12,345
Income from operations	19,610	18,634	59,054	52,591
Income tax (expense) benefit	(3,572)	(3,504)	(10,701)	(9,352)
Net income	16,038	15,130	48,353	43,239
Property Management, Acquisition and Development [Member]
Segment Reporting Information [Line Items]
Total assets	315,670		315,670		$ 315,630
Total revenues	9,685	10,005	29,239	30,193
Operating expenses, including depreciation and amortization	22,841	23,836	67,489	79,471
Income from operations	(13,156)	(13,831)	(38,250)	(49,278)
Gain (loss) on real estate transactions, earnout from prior acquisition and impairment of real estate	0	0	(6,019)	9,814
Interest expense	(1,387)	(875)	(3,778)	(2,530)
Non-cash interest expense related to amortization of discount on equity component of exchangeable senior notes	(1,268)	(1,243)	(3,827)	(3,716)
Interest income	869	1,358	2,797	4,697
Interest income on note receivable from Preferred Operating Partnership unit holder	532	1,213	2,404	3,638
Equity in earnings of unconsolidated real estate ventures - gain on sale of real estate assets and purchase of joint venture partners' interests	0	37,509	0	64,432
Income tax (expense) benefit	1,243	(412)	3,306	188
Net income	(13,167)	23,719	(43,367)	27,245
Depreciation and amortization expense	3,343	2,366	7,318	6,896
Acquisition of real estate assets			(119,040)	(763,246)
Development and redevelopment of real estate assets			$ (20,670)	$ (18,492)

XML

Segment Information - Additional Information (Detail)	9 Months Ended
	Sep. 30, 2017 segment
Segment Reporting [Abstract]
Number of reportable segments	3

XML

Commitments and Contingencies - Additional Information (Detail) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2017 USD ($) store	Sep. 30, 2017 USD ($) store
Commitments And Contingencies [Line Items]
Insurance recoveries | $	$ 2,110
Reinsurance recoverables, case basis | $	2,250	$ 2,250
Commitment To Acquire Retail Space [Member]
Commitments And Contingencies [Line Items]
Number of real estate properties to be acquired | store		35
Purchase price | $	462,116	$ 462,116
Commitment To Acquire Retail Space, Closing In 2017 [Member]
Commitments And Contingencies [Line Items]
Purchase price | $	$ 308,225	$ 308,225
Number of stores scheduled to be closed | store	23	23
Commitment To Acquire Retail Space, Closing In 2018 [Member]
Commitments And Contingencies [Line Items]
Purchase price | $	$ 35,428	$ 35,428
Number of stores scheduled to be closed | store	3	3
Commitment To Acquire Retail Space, Closing After 2018 [Member]
Commitments And Contingencies [Line Items]
Purchase price | $	$ 118,463	$ 118,463
Number of stores scheduled to be closed | store	9	9
Commitment To Acquire Retail Space With Joint Venture Partners [Member]
Commitments And Contingencies [Line Items]
Number of real estate properties to be acquired | store		19
Purchase price | $	$ 96,750	$ 96,750
Commitment To Acquire Retail Space With Joint Venture Partners, Closing in 2017 [Member] [Member]
Commitments And Contingencies [Line Items]
Number of stores scheduled to be closed | store	6	6
Commitment To Acquire Retail Space With Joint Venture Partners, Closing in 2018 [Member]
Commitments And Contingencies [Line Items]
Number of stores scheduled to be closed | store	13	13

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Subsequent Events (Details) - Subsequent Event [Member] $ in Thousands	1 Months Ended
	Nov. 03, 2017 USD ($) store
Subsequent Event [Line Items]
Number of stores acquired | store	7
Purchase price to acquire real estate | $	$ 83,125