10-Q

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549 

____________________________________________________________________________

FORM 10-Q 

____________________________________________________________________________

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

For the Quarterly Period Ended September 30, 2019

OR

☐ 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 1-34907

____________________________________________________________________________

STAG Industrial, Inc.

(Exact name of registrant as specified in its charter) 

____________________________________________________________________________

Maryland		27-3099608
(State or other jurisdiction of		(IRS Employer Identification No.)
incorporation or organization)
One Federal Street
23rd Floor
Boston,	Massachusetts	02110
(Address of principal executive offices)		(Zip code)

(617) 574-4777

(Registrant’s telephone number, including area code)

Securities registered pursuant to Section 12(b) of the Act:

Title of each class	Trading symbol(s)	Name of each exchange on which registered
Common stock, $0.01 par value per share	STAG	New York Stock Exchange
6.875% Series C Cumulative Redeemable Preferred Stock ($0.01 par value)	STAG-PC	New York Stock Exchange

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 ☒  No ☐

Indicate by check mark whether the registrant has submitted electronically every Interactive Data File required to be submitted 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 such files).  Yes ☒  No ☐

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

Large accelerated filer ☒  Accelerated filer  ☐  Non-accelerated filer ☐  Smaller reporting company ☐  Emerging growth company ☐

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

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

The number of shares of common stock outstanding at October 29, 2019 was 132,957,164.

STAG Industrial, Inc.

Table of Contents 

PART I.	Financial Information	3
Item 1.	Financial Statements (unaudited)	3
	Consolidated Balance Sheets as of September 30, 2019 and December 31, 2018	3
	Consolidated Statements of Operations for the Three and Nine Months Ended September 30, 2019 and 2018	4
	Consolidated Statements of Comprehensive Income for the Three and Nine Months Ended September 30, 2019 and 2018	5
	Consolidated Statements of Equity for the Three and Nine Months Ended September 30, 2019 and 2018	6
	Consolidated Statements of Cash Flows for the Nine Months Ended September 30, 2019 and 2018	7
	Notes to Consolidated Financial Statements	8
Item 2.	Management’s Discussion and Analysis of Financial Condition and Results of Operations	27
Item 3.	Quantitative and Qualitative Disclosures about Market Risk	49
Item 4.	Controls and Procedures	49
PART II.	Other Information	50
Item 1.	Legal Proceedings	50
Item 1A.	Risk Factors	50
Item 2.	Unregistered Sales of Equity Securities and Use of Proceeds	50
Item 3.	Defaults Upon Senior Securities	50
Item 4.	Mine Safety Disclosures	50
Item 5.	Other Information	50
Item 6.	Exhibits	51
	SIGNATURES	52

2

Part I. Financial Information

Item 1.  Financial Statements

STAG Industrial, Inc.

Consolidated Balance Sheets

(unaudited, in thousands, except share data)

	September 30, 2019		December 31, 2018
Assets
Rental Property:
Land	$	420,215	$	364,023
Buildings and improvements, net of accumulated depreciation of $367,088 and $316,930, respectively	2,788,766		2,285,663
Deferred leasing intangibles, net of accumulated amortization of $241,323 and $246,502, respectively	413,955		342,015
Total rental property, net	3,622,936		2,991,701
Cash and cash equivalents	6,540		7,968
Restricted cash	2,733		14,574
Tenant accounts receivable	50,460		42,236
Prepaid expenses and other assets	46,707		36,902
Interest rate swaps	488		9,151
Operating lease right-of-use assets	15,425		—
Total assets	$	3,745,289	$	3,102,532
Liabilities and Equity
Liabilities:
Unsecured credit facility	$	78,000	$	100,500
Unsecured term loans, net	771,037		596,360
Unsecured notes, net	572,783		572,488
Mortgage notes, net	55,210		56,560
Accounts payable, accrued expenses and other liabilities	63,572		45,507
Interest rate swaps	24,812		4,011
Tenant prepaid rent and security deposits	21,131		22,153
Dividends and distributions payable	16,293		13,754
Deferred leasing intangibles, net of accumulated amortization of $11,259 and $12,764, respectively	20,237		21,567
Operating lease liabilities	17,259		—
Total liabilities	1,640,334		1,432,900
Commitments and contingencies (Note 11)
Equity:
Preferred stock, par value $0.01 per share, 20,000,000 and 15,000,000 shares authorized at September 30, 2019 and December 31, 2018, respectively,
Series C, 3,000,000 shares (liquidation preference of $25.00 per share) issued and outstanding at September 30, 2019 and December 31, 2018	75,000		75,000
Common stock, par value $0.01 per share, 300,000,000 and 150,000,000 shares authorized at September 30, 2019 and December 31, 2018, respectively, 132,958,388 and 112,165,786 shares issued and outstanding at September 30, 2019 and December 31, 2018, respectively	1,330		1,122
Additional paid-in capital	2,687,118		2,118,179
Cumulative dividends in excess of earnings	(690,324)		(584,979)
Accumulated other comprehensive income (loss)	(24,030)		4,481
Total stockholders’ equity	2,049,094		1,613,803
Noncontrolling interest	55,861		55,829
Total equity	2,104,955		1,669,632
Total liabilities and equity	$	3,745,289	$	3,102,532

The accompanying notes are an integral part of these consolidated financial statements.

3

STAG Industrial, Inc.

Consolidated Statements of Operations

(unaudited, in thousands, except per share data)

	Three months ended September 30,				Nine months ended September 30,
	2019		2018		2019		2018
Revenue
Rental income	$	102,294	$	88,677	$	294,271	$	256,670
Other income	127		269		498		1,033
Total revenue	102,421		88,946		294,769		257,703
Expenses
Property	18,157		17,112		54,623		50,735
General and administrative	8,924		8,911		26,723		25,637
Depreciation and amortization	46,908		44,355		133,844		125,221
Loss on impairments	4,413		—		9,757		2,934
Other expenses	458		223		1,284		864
Total expenses	78,860		70,601		226,231		205,391
Other income (expense)
Interest and other income	12		3		30		16
Interest expense	(14,053)		(12,698)		(39,080)		(35,602)
Loss on extinguishment of debt	—		(13)		—		(13)
Gain on the sales of rental property, net	1,670		3,239		3,261		32,276
Total other income (expense)	(12,371)		(9,469)		(35,789)		(3,323)
Net income	$	11,190	$	8,876	$	32,749	$	48,989
Less: income attributable to noncontrolling interest after preferred stock dividends	290		281		912		1,589
Net income attributable to STAG Industrial, Inc.	$	10,900	$	8,595	$	31,837	$	47,400
Less: preferred stock dividends	1,289		1,289		3,867		6,315
Less: redemption of preferred stock	—		—		—		2,661
Less: amount allocated to participating securities	78		69		236		209
Net income attributable to common stockholders	$	9,533	$	7,237	$	27,734	$	38,215
Weighted average common shares outstanding — basic	127,272		105,783		122,460		101,095
Weighted average common shares outstanding — diluted	127,469		106,333		122,720		101,495
Net income per share — basic and diluted
Net income per share attributable to common stockholders — basic	$	0.07	$	0.07	$	0.23	$	0.38
Net income per share attributable to common stockholders — diluted	$	0.07	$	0.07	$	0.23	$	0.38

The accompanying notes are an integral part of these consolidated financial statements.

4

STAG Industrial, Inc.

Consolidated Statements of Comprehensive Income

(unaudited, in thousands)

	Three months ended September 30,				Nine months ended September 30,
	2019		2018		2019		2018
Net income	$	11,190	$	8,876	$	32,749	$	48,989
Other comprehensive income (loss):
Income (loss) on interest rate swaps	(6,435)		2,060		(29,441)		12,811
Other comprehensive income (loss)	(6,435)		2,060		(29,441)		12,811
Comprehensive income	4,755		10,936		3,308		61,800
Income attributable to noncontrolling interest after preferred stock dividends	(290)		(281)		(912)		(1,589)
Other comprehensive (income) loss attributable to noncontrolling interest	176		(76)		930		(509)
Comprehensive income attributable to STAG Industrial, Inc.	$	4,641	$	10,579	$	3,326	$	59,702

The accompanying notes are an integral part of these consolidated financial statements.

5

STAG Industrial, Inc.

Consolidated Statements of Equity

(unaudited, in thousands, except share data)

	Preferred Stock		Common Stock			Additional Paid-in Capital		Cumulative Dividends in Excess of Earnings		Accumulated Other Comprehensive Income (Loss)		Total Stockholders’ Equity		Noncontrolling Interest - Unit Holders in Operating Partnership		Total Equity
			Shares	Amount
Three months ended September 30, 2019
Balance, June 30, 2019	$	75,000	126,372,945	$	1,264	$	2,501,013	$	(653,759)	$	(17,771)	$	1,905,747	$	57,505	$	1,963,252
Proceeds from sales of common stock, net	—		6,375,129	64		183,148		—		—		183,212		—		183,212
Dividends and distributions, net	—		—	—		—		(47,465)		—		(47,465)		(1,375)		(48,840)
Non-cash compensation activity, net	—		3,162	—		1,675		—		—		1,675		901		2,576
Redemption of common units to common stock	—		207,152	2		3,001		—		—		3,003		(3,003)		—
Rebalancing of noncontrolling interest	—		—	—		(1,719)		—		—		(1,719)		1,719		—
Other comprehensive loss	—		—	—		—		—		(6,259)		(6,259)		(176)		(6,435)
Net income	—		—	—		—		10,900		—		10,900		290		11,190
Balance, September 30, 2019	$	75,000	132,958,388	$	1,330	$	2,687,118	$	(690,324)	$	(24,030)	$	2,049,094	$	55,861	$	2,104,955
Three months ended September 30, 2018
Balance, June 30, 2018	$	75,000	104,238,166	$	1,042	$	1,905,002	$	(559,312)	$	14,492	$	1,436,224	$	53,403	$	1,489,627
Proceeds from sales of common stock, net	—		3,568,382	36		98,481		—		—		98,517		—		98,517
Dividends and distributions, net	—		—	—		—		(39,094)		—		(39,094)		(1,443)		(40,537)
Non-cash compensation activity, net	—		(757)	—		1,361		—		—		1,361		893		2,254
Redemption of common units to common stock	—		20,000	—		261		—		—		261		(261)		—
Rebalancing of noncontrolling interest	—		—	—		(1,122)		—		—		(1,122)		1,122		—
Other comprehensive income	—		—	—		—		—		1,993		1,993		67		2,060
Net income	—		—	—		—		8,621		—		8,621		255		8,876
Balance, September 30, 2018	$	75,000	107,825,791	$	1,078	$	2,003,983	$	(589,785)	$	16,485	$	1,506,761	$	54,036	$	1,560,797
Nine months ended September 30, 2019
Balance, December 31, 2018	$	75,000	112,165,786	$	1,122	$	2,118,179	$	(584,979)	$	4,481	$	1,613,803	$	55,829	$	1,669,632
Leases cumulative effect adjustment (Note 2)	—		—	—		—		(214)		—		(214)		—		(214)
Proceeds from sales of common stock, net	—		19,997,332	201		567,876		—		—		568,077		—		568,077
Dividends and distributions, net	—		—	—		—		(136,595)		—		(136,595)		(5,247)		(141,842)
Non-cash compensation activity, net	—		134,188	1		2,198		(373)		—		1,826		4,168		5,994
Redemption of common units to common stock	—		661,082	6		9,232		—		—		9,238		(9,238)		—
Rebalancing of noncontrolling interest	—		—	—		(10,367)		—		—		(10,367)		10,367		—
Other comprehensive loss	—		—	—		—		—		(28,511)		(28,511)		(930)		(29,441)
Net income	—		—	—		—		31,837		—		31,837		912		32,749
Balance, September 30, 2019	$	75,000	132,958,388	$	1,330	$	2,687,118	$	(690,324)	$	(24,030)	$	2,049,094	$	55,861	$	2,104,955
Nine months ended September 30, 2018
Balance, December 31, 2017	$	145,000	97,012,543	$	970	$	1,725,825	$	(516,691)	$	3,936	$	1,359,040	$	51,267	$	1,410,307
Cash flow hedging instruments cumulative effect adjustment	—		—	—		—		(258)		247		(11)		11		—
Proceeds from sales of common stock, net	—		10,387,962	104		273,224		—		—		273,328		—		273,328
Redemption of preferred stock	(70,000)		—	—		5,141		(5,158)		—		(70,017)		—		(70,017)
Dividends and distributions, net	—		—	—		—		(114,541)		—		(114,541)		(5,253)		(119,794)
Non-cash compensation activity, net	—		73,231	1		1,829		(537)		—		1,293		3,880		5,173
Redemption of common units to common stock	—		352,055	3		4,398		—		—		4,401		(4,401)		—
Rebalancing of noncontrolling interest	—		—	—		(6,434)		—		—		(6,434)		6,434		—
Other comprehensive income	—		—	—		—		—		12,302		12,302		509		12,811
Net income	—		—	—		—		47,400		—		47,400		1,589		48,989
Balance, September 30, 2018	$	75,000	107,825,791	$	1,078	$	2,003,983	$	(589,785)	$	16,485	$	1,506,761	$	54,036	$	1,560,797

The accompanying notes are an integral part of these consolidated financial statements.

6

STAG Industrial, Inc.

Consolidated Statements of Cash Flows

(unaudited, in thousands)

	Nine months ended September 30,
	2019		2018
Cash flows from operating activities:
Net income	$	32,749	$	48,989
Adjustment to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	133,844		125,221
Loss on impairments	9,757		2,934
Non-cash portion of interest expense	1,909		1,698
Amortization of above and below market leases, net	3,344		3,206
Straight-line rent adjustments, net	(8,586)		(8,297)
Dividends on forfeited equity compensation	7		15
Loss on extinguishment of debt	—		13
Gain on the sales of rental property, net	(3,261)		(32,276)
Non-cash compensation expense	7,371		6,671
Change in assets and liabilities:
Tenant accounts receivable	509		501
Prepaid expenses and other assets	(10,525)		(9,597)
Accounts payable, accrued expenses and other liabilities	8,834		9,249
Tenant prepaid rent and security deposits	(1,022)		283
Total adjustments	142,181		99,621
Net cash provided by operating activities	174,930		148,610
Cash flows from investing activities:
Acquisitions of land and buildings and improvements	(616,647)		(382,981)
Additions of land and building and improvements	(40,193)		(23,578)
Acquisitions of other assets	(2,513)		(794)
Acquisitions of other liabilities	—		242
Proceeds from sales of rental property, net	23,700		89,407
Acquisition deposits, net	(1,190)		(695)
Acquisitions of deferred leasing intangibles	(128,832)		(74,851)
Net cash used in investing activities	(765,675)		(393,250)
Cash flows from financing activities:
Proceeds from unsecured credit facility	768,000		643,000
Repayment of unsecured credit facility	(790,500)		(819,000)
Proceeds from unsecured term loans	175,000		150,000
Proceeds from unsecured notes	—		175,000
Repayment of mortgage notes	(1,441)		(1,379)
Payment of loan fees and costs	(1,226)		(4,451)
Proceeds from sales of common stock, net	568,390		273,266
Redemption of preferred stock	—		(70,000)
Dividends and distributions	(139,303)		(117,146)
Repurchase and retirement of share-based compensation	(1,444)		(1,524)
Net cash provided by financing activities	577,476		227,766
Decrease in cash and cash equivalents and restricted cash	(13,269)		(16,874)
Cash and cash equivalents and restricted cash—beginning of period	22,542		28,129
Cash and cash equivalents and restricted cash—end of period	$	9,273	$	11,255
Supplemental disclosure:
Cash paid for interest, net of capitalized interest	$	35,372	$	31,875
Supplemental schedule of non-cash investing and financing activities
Acquisitions of land and buildings and improvements	$	(72)	$	(232)
Acquisitions of deferred leasing intangibles	$	(24)	$	(48)
Change in additions of land, building, and improvements included in accounts payable, accrued expenses, and other liabilities	$	(10,824)	$	(1,475)
Additions to building and other capital improvements from non-cash compensation	$	(59)	$	(20)
Change in loan fees, costs, and offering costs included in accounts payable, accrued expenses, and other liabilities	$	(314)	$	48
Reclassification of preferred stock called for redemption to liability	$	—	$	70,000
Leases cumulative effect adjustment (Note 2)	$	(214)	$	—
Dividends and distributions accrued	$	16,293	$	14,530

The accompanying notes are an integral part of these consolidated financial statements.

7

STAG Industrial, Inc.

Notes to Consolidated Financial Statements

(unaudited)

1. Organization and Description of Business

STAG Industrial, Inc. (the “Company”) is an industrial real estate operating company focused on the acquisition and operation of single-tenant, industrial properties throughout the United States. The Company was formed as a Maryland corporation and has elected to be treated and intends to continue to qualify as a real estate investment trust (“REIT”) under Sections 856 through 860 of the Internal Revenue Code of 1986, as amended. The Company is structured as an umbrella partnership REIT, commonly called an UPREIT, and owns substantially all of its assets and conducts substantially all of its business through its operating partnership, STAG Industrial Operating Partnership, L.P., a Delaware limited partnership (the “Operating Partnership”). As of September 30, 2019 and December 31, 2018, the Company owned a 97.2% and 96.5%, respectively, common equity interest in the Operating Partnership. The Company, through its wholly owned subsidiary, is the sole general partner of the Operating Partnership. As used herein, the “Company” refers to STAG Industrial, Inc. and its consolidated subsidiaries and partnerships, including the Operating Partnership, except where context otherwise requires.

As of September 30, 2019, the Company owned 430 buildings in 37 states with approximately 86.0 million rentable square feet, consisting of 356 warehouse/distribution buildings, 66 light manufacturing buildings, and eight flex/office buildings.

2. Summary of Significant Accounting Policies

Interim Financial Information

The accompanying interim financial statements have been presented in conformity with accounting principles generally accepted in the United States of America (“GAAP”) and with the instructions to Form 10-Q and Regulation S-X for interim financial information. Accordingly, these statements do not include all of the information and notes required by GAAP for complete financial statements. In the opinion of management, the accompanying interim financial statements include all adjustments, consisting of normal recurring items, necessary for their fair statement in conformity with GAAP. Interim results are not necessarily indicative of results for a full year. The year-end consolidated balance sheet data was derived from audited financial statements, but does not include all disclosures required by GAAP. The information included in this Quarterly Report on Form 10-Q should be read in conjunction with the Company’s consolidated financial statements and notes thereto contained in the Company’s Annual Report on Form 10-K for the fiscal year ended December 31, 2018.

Basis of Presentation

The Company’s consolidated financial statements include the accounts of the Company, the Operating Partnership, and their subsidiaries. Interests in the Operating Partnership not owned by the Company are referred to as “Noncontrolling Common Units.” These Noncontrolling Common Units are held by other limited partners in the form of common units (“Other Common Units”) and long term incentive plan units (“LTIP units”) issued pursuant to the STAG Industrial, Inc. 2011 Equity Incentive Plan, as amended and restated (the “2011 Plan”). All significant intercompany balances and transactions have been eliminated in the consolidation of entities. The financial statements of the Company are presented on a consolidated basis for all periods presented.

New Accounting Standards and Reclassifications

New Accounting Standards Adopted

In July 2018, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) 2018-11 which amends Topic 842, Leases, and provides lessors with a practical expedient, by class of underlying asset, to not separate non-lease components from the associated lease component and, instead, to account for those components as a single component if the non-lease components otherwise would be accounted for under the new revenue guidance and both of the following are met: i) the timing and pattern of transfer of the non-lease component(s) and associated lease component are the same; and ii) the lease component, if accounted for separately, would be classified as an operating lease. Under this new expedient, if the non-lease components associated with the lease component are the predominant component of the combined component, a company should account for the combined component in accordance with Topic 606, Revenue from Contracts with Customers. Otherwise, the company should account for the combined component as an operating lease in accordance with Topic 842. In December 2018, the FASB issued ASU 2018-20 which amends Topic 842, Leases, and allows lessors to continue to exclude from revenue the lessor costs that are paid by lessees directly to third parties. The Company adopted Topic 842 on

8

January 1, 2019, using the practical expedient, and it did not have a material impact on the Company’s consolidated financial statements. The Company determined that for all leases where the Company is the lessor, that the timing and pattern of transfer of the non-lease components and associated lease components are the same, and that the lease components, if accounted for separately, would be classified as an operating lease. Accordingly, the Company has made an accounting policy election to recognize the combined component in accordance with Topic 842 as rental income on the accompanying Consolidated Statements of Operations.

In February 2016, the FASB issued ASU 2016-02, Leases (Topic 842), and various subsequent ASU’s, which set out the principles for the recognition, measurement, presentation and disclosure of leases for both parties to a contract (i.e. lessees and lessors). Topic 842 superseded the previous leases standard, Topic 840, Leases. The new standard requires lessees to apply a dual approach, classifying leases as either finance or operating leases based on the principle of whether or not the lease is effectively a financed purchase by the lessee. This classification determines whether lease expense is recognized based on an effective interest method or on a straight line basis over the term of the lease, respectively. A lessee is also required to record a right-of-use asset and a lease liability for all leases with a term of greater than 12 months regardless of their classification. Leases with a term of 12 months or less are accounted for similar to the previous guidance for operating leases. The new standard requires lessors to account for leases using an approach that is substantially equivalent to the previous guidance for sales-type leases, direct financing leases and operating leases. ASU 2016-02 impacted the Company’s consolidated financial statements as the Company has ground leases and its corporate office lease for which it is the lessee, which resulted in the recording of a right-of-use asset and the related lease liability.

The Company adopted ASU 2016-02 on January 1, 2019, using the modified retrospective transition method. The adoption of this standard resulted in a cumulative effect adjustment of approximately $0.2 million recorded as an increase to cumulative dividends in excess of earnings as of January 1, 2019 in the accompanying Consolidated Statements of Equity. The cumulative effect adjustment related to initial direct costs of leases where the Company is the lessor and that, as of January 1, 2019, had not begun to amortize and are no longer allowed to be capitalized under the new standard. On January 1, 2019, the Company recognized operating lease right-of-use assets of approximately $16.3 million and related operating lease liabilities of approximately $18.0 million on the accompanying Consolidated Balance Sheets, related to the leases where the Company is the lessee. The Company adopted the new standard using the practical expedient package which allowed the Company to (i) not reassess whether any expired or existing contracts are or contain leases; (ii) not reassess the lease classification for any expired or existing leases; and (iii) not reassess initial direct costs for any existing leases. This practical expedient allows the Company to continue to account for its ground leases as operating leases. Prospectively, any new or modified ground leases may be classified as a financing lease. The adoption of this standard by the Company has been applied as of January 1, 2019, and the comparative periods have not been restated.

For leases in which the Company is the lessee, the Company recognizes a right-of-use asset and corresponding lease liability on the accompanying Consolidated Balance Sheets equal to the present value of the fixed lease payments. In determining operating right-of-use asset and lease liability for the Company’s existing operating leases upon the adoption of the new lease guidance, the Company was required to estimate an appropriate incremental borrowing rate on a fully-collateralized basis for the terms of the leases. The Company utilized a market-based approach to estimate the incremental borrowing rate for each individual lease. Since the terms under the ground leases are significantly longer than the terms of borrowings available to the Company on a fully-collateralized basis, the estimate of this rate required significant judgment, and considered factors such as yields on outstanding public debt and other market based pricing on longer duration financing instruments.

The new leases standard requires the Company to evaluate cash basis versus accrual basis of rental income recognition based on the collectability of future lease payments.

Reclassifications

Prior period amounts have been reclassified to conform to the current year presentation due to the adoption of ASU 2016-02. Amounts previously classified as rental income and tenant recoveries in the prior period are now classified as rental income on the accompanying Consolidated Statements of Operations, as the Company has made an accounting policy election to combine these amounts that are accounted for under the new leases standard.

Certain other prior period amounts have been reclassified to conform to the current year presentation.

9

Restricted Cash

The following table presents a reconciliation of cash and cash equivalents and restricted cash reported on the accompanying Consolidated Balance Sheets to amounts reported on the accompanying Consolidated Statements of Cash Flows.

Reconciliation of cash and cash equivalents and restricted cash (in thousands)	September 30, 2019		December 31, 2018
Cash and cash equivalents	$	6,540	$	7,968
Restricted cash	2,733		14,574
Total cash and cash equivalents and restricted cash	$	9,273	$	22,542

Taxes

Federal Income Taxes

The Company’s taxable REIT subsidiaries recognized net income (loss) of approximately $0, $0.3 million, $(22,000) and $(0.1) million for the three and nine months ended September 30, 2019 and 2018, respectively, which has been included on the accompanying Consolidated Statements of Operations.

State and Local Income, Excise, and Franchise Tax

State and local income, excise, and franchise taxes in the amount of $0.3 million, $0.9 million, $0.1 million and $0.6 million have been recorded in other expenses on the accompanying Consolidated Statements of Operations for the three and nine months ended September 30, 2019 and 2018, respectively.

Uncertain Tax Positions

As of September 30, 2019 and December 31, 2018, there were no liabilities for uncertain tax positions.

Concentrations of Credit Risk

Management believes the current credit risk of the Company’s portfolio is reasonably well diversified and does not contain any unusual concentration of credit risk.

3. Rental Property

The following table summarizes the components of rental property as of September 30, 2019 and December 31, 2018.

Rental Property (in thousands)	September 30, 2019		December 31, 2018
Land	$	420,215	$	364,023
Buildings, net of accumulated depreciation of $240,968 and $199,497, respectively	2,520,684		2,082,781
Tenant improvements, net of accumulated depreciation of $20,979 and $36,450, respectively	33,829		30,704
Building and land improvements, net of accumulated depreciation of $105,141 and $80,983, respectively	210,558		168,229
Construction in progress	23,695		3,949
Deferred leasing intangibles, net of accumulated amortization of $241,323 and $246,502, respectively	413,955		342,015
Total rental property, net	$	3,622,936	$	2,991,701

10

Acquisitions

The following table summarizes the acquisitions of the Company during the three and nine months ended September 30, 2019.

Market (1)	Date Acquired	Square Feet	Buildings	Purchase Price (in thousands)
Cincinnati/Dayton, OH	January 24, 2019	176,000	1	$	9,965
Pittsburgh, PA	February 21, 2019	455,000	1	28,676
Boston, MA	February 21, 2019	349,870	1	26,483
Minneapolis/St Paul, MN	February 28, 2019	248,816	1	21,955
Greenville/Spartanburg, SC	March 7, 2019	331,845	1	24,536
Philadelphia, PA	March 7, 2019	148,300	1	10,546
Omaha/Council Bluffs, NE-IA	March 11, 2019	237,632	1	20,005
Houston, TX	March 28, 2019	132,000	1	17,307
Baltimore, MD	March 28, 2019	167,410	1	13,648
Houston, TX	March 28, 2019	116,750	1	12,242
Three months ended March 31, 2019		2,363,623	10	185,363
Minneapolis/St Paul, MN	April 2, 2019	100,600	1	9,045
West Michigan, MI	April 8, 2019	230,200	1	15,786
Greensboro/Winston-Salem, NC	April 12, 2019	129,600	1	7,771
Greenville/Spartanburg, SC	April 25, 2019	319,660	2	15,432
Charleston/N Charleston, SC	April 29, 2019	500,355	1	40,522
Houston, TX	April 29, 2019	128,136	1	13,649
Richmond, VA	May 16, 2019	109,520	1	9,467
Laredo, TX	June 6, 2019	213,982	1	18,972
Baton Rouge, LA	June 18, 2019	252,800	2	20,041
Philadelphia, PA	June 19, 2019	187,569	2	13,645
Columbus, OH	June 28, 2019	857,390	1	95,828
Three months ended June 30, 2019		3,029,812	14	260,158
Kansas City, MO	July 10, 2019	304,840	1	13,450
Houston, TX	July 22, 2019	199,903	1	11,287
Charleston/N Charleston, SC	July 22, 2019	88,583	1	7,166
Tampa, FL	August 5, 2019	78,560	1	8,168
Philadelphia, PA	August 6, 2019	120,000	1	10,880
Milwaukee/Madison, WI	August 16, 2019	224,940	3	13,981
Houston, TX	August 19, 2019	45,000	1	6,190
West Michigan, MI	August 19, 2019	210,120	1	10,407
Pittsburgh, PA	August 21, 2019	410,389	1	31,219
Boston, MA	August 22, 2019	80,100	1	14,253
Las Vegas, NV	August 27, 2019	80,422	2	12,602
Nashville, TN	August 29, 2019	348,880	1	20,267
Columbia, SC	August 30, 2019	200,000	1	13,670
Pittsburgh, PA	September 6, 2019	138,270	1	9,323
Omaha/Council Bluffs, NE-IA	September 11, 2019	128,200	2	8,509
Pittsburgh, PA	September 16, 2019	315,634	1	28,712
Memphis, TN	September 19, 2019	1,135,453	1	50,941
Memphis, TN	September 26, 2019	629,086	1	31,542
Three months ended September 30, 2019		4,738,380	22	302,567
Nine months ended September 30, 2019		10,131,815	46	$	748,088

(1) As defined by CoStar Realty Information Inc (“CoStar”). If the building is located outside of a CoStar defined market, the city and state is reflected.

11

The following table summarizes the allocation of the consideration paid at the date of acquisition during the nine months ended September 30, 2019 for the acquired assets and liabilities in connection with the acquisitions identified in the table above.

Acquired Assets and Liabilities	Purchase Price (in thousands)		Weighted Average Amortization Period (years) of Intangibles at Acquisition
Land	$	63,317	N/A
Buildings	499,255		N/A
Tenant improvements	6,246		N/A
Building and land improvements	45,869		N/A
Construction in progress	2,032		N/A
Other assets	2,513		N/A
Deferred leasing intangibles - In-place leases	76,628		8.9
Deferred leasing intangibles - Tenant relationships	36,008		11.7
Deferred leasing intangibles - Above market leases	19,449		12.8
Deferred leasing intangibles - Below market leases	(3,229)		6.9
Total purchase price	$	748,088

The following table summarizes the results of operations for the three and nine months ended September 30, 2019 for the buildings acquired during the nine months ended September 30, 2019 included in the Company’s Consolidated Statements of Operations from the date of acquisition.

Results of Operations (in thousands)	Three months ended September 30, 2019		Nine months ended September 30, 2019
Total revenue	$	10,616	$	17,307
Net income	$	2,173	$	2,985

Dispositions

During the nine months ended September 30, 2019, the Company sold six buildings and two land parcels comprised of approximately 1.1 million rentable square feet with a net book value of approximately $20.4 million to third parties. These buildings and land parcels contributed approximately $20,000, $0.8 million, $1.5 million, and $5.3 million to revenue for the three and nine months ended September 30, 2019 and 2018, respectively. These buildings and land parcels contributed approximately $(0.1) million, $(0.2) million, $0.5 million, and $0.9 million to net income (loss) (exclusive of loss on impairments and gain on the sales of rental property, net) for the three and nine months ended September 30, 2019 and 2018, respectively. Net proceeds from the sales of rental property were approximately $23.7 million and the Company recognized the full gain on the sales of rental property, net, of approximately $3.3 million for the nine months ended September 30, 2019.

Loss on Impairments

The following table summarizes the Company’s loss on impairments for assets held and used during the nine months ended September 30, 2019.

Market(1)	Buildings	Event or Change in Circumstance Leading to Impairment Evaluation(2)		Valuation technique utilized to estimate fair value		Fair Value(3)		Loss on Impairments
						(in thousands)
Rapid City, SD(4)	1	Change in estimated hold period	(5)	Discounted cash flows	(6)
Three months ended March 31, 2019						$	4,373	$	5,344
Belfast, ME(4)	5	Market leasing conditions		Discounted cash flows	(7)
Three months ended September 30, 2019						$	5,950	$	4,413
Nine months ended September 30, 2019						$	10,323	$	9,757

(1)As defined by CoStar. If the building is located outside of a CoStar defined market, the city and state is reflected.

(2)The Company tested the asset group for impairment utilizing a probability weighted recovery analysis of certain scenarios, and it was determined that the carrying value of the property and intangibles were not recoverable from the estimated future undiscounted cash flows.

(3)The estimated fair value of the property is based on Level 3 inputs and is a non-recurring fair value measurement. Level 3 is defined as unobservable inputs in which little or no market data exists, therefore requiring an entity to develop its own assumptions.

(4)Flex/office buildings.

(5)This property was sold during the three months ended September 30, 2019.

(6)Level 3 inputs used to determine fair value for the property impaired for the three months ended March 31, 2019: discount rate of 12.0% and exit capitalization rate of 12.0%.

(7)Level 3 inputs used to determine fair value for the property impaired for the three months ended September 30, 2019: discount rate of 13.0% and exit capitalization rate of 12.0%.

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Deferred Leasing Intangibles

The following table summarizes the deferred leasing intangibles on the accompanying Consolidated Balance Sheets as of September 30, 2019 and December 31, 2018.

	September 30, 2019						December 31, 2018
Deferred Leasing Intangibles (in thousands)	Gross		Accumulated Amortization		Net		Gross		Accumulated Amortization		Net
Above market leases	$	88,388	$	(33,439)	$	54,949	$	73,122	$	(31,059)	$	42,063
Other intangible lease assets	566,890		(207,884)		359,006		515,395		(215,443)		299,952
Total deferred leasing intangible assets	$	655,278	$	(241,323)	$	413,955	$	588,517	$	(246,502)	$	342,015
Below market leases	$	31,496	$	(11,259)	$	20,237	$	34,331	$	(12,764)	$	21,567
Total deferred leasing intangible liabilities	$	31,496	$	(11,259)	$	20,237	$	34,331	$	(12,764)	$	21,567

The following table summarizes the amortization expense and the net decrease to rental income for the amortization of deferred leasing intangibles during the three and nine months ended September 30, 2019 and 2018.

	Three months ended September 30,				Nine months ended September 30,
Deferred Leasing Intangibles Amortization (in thousands)	2019		2018		2019		2018
Net decrease to rental income related to above and below market lease amortization	$	1,248	$	1,150	$	3,361	$	3,206
Amortization expense related to other intangible lease assets	$	18,472	$	20,361	$	53,185	$	56,698

The following table summarizes the amortization of deferred leasing intangibles over the next five calendar years beginning with 2019 as of September 30, 2019.

Year	Amortization Expense Related to Other Intangible Lease Assets (in thousands)		Net Decrease to Rental Income Related to Above and Below Market Lease Amortization (in thousands)
Remainder of 2019	$	18,698	$	1,283
2020	$	66,090	$	4,870
2021	$	54,264	$	3,559
2022	$	45,234	$	2,657
2023	$	37,492	$	2,608

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4. Debt

The following table summarizes the Company’s outstanding indebtedness, including borrowings under the Company’s unsecured credit facility, unsecured term loans, unsecured notes, and mortgage notes as of September 30, 2019 and December 31, 2018.

Loan	Principal Outstanding as of September 30, 2019 (in thousands)		Principal Outstanding as of December 31, 2018 (in thousands)		Interest  Rate (1)(2)		Maturity Date	Prepayment Terms (3)
Unsecured credit facility:
Unsecured Credit Facility (4)	$	78,000	$	100,500	L + 0.90%		January 15, 2023	i
Total unsecured credit facility	78,000		100,500
Unsecured term loans:
Unsecured Term Loan C	150,000		150,000		2.39	%	September 29, 2020	i
Unsecured Term Loan B	150,000		150,000		3.05	%	March 21, 2021	i
Unsecured Term Loan A	150,000		150,000		2.70	%	March 31, 2022	i
Unsecured Term Loan D	150,000		150,000		2.85	%	January 4, 2023	i
Unsecured Term Loan E	175,000		—		3.92	%	January 15, 2024	i
Unsecured Term Loan F (5)	—		—		3.11	%	January 12, 2025	i
Total unsecured term loans	775,000		600,000
Less: Total unamortized deferred financing fees and debt issuance costs	(3,963)		(3,640)
Total carrying value unsecured term loans, net	771,037		596,360
Unsecured notes:
Series F Unsecured Notes	100,000		100,000		3.98	%	January 5, 2023	ii
Series A Unsecured Notes	50,000		50,000		4.98	%	October 1, 2024	ii
Series D Unsecured Notes	100,000		100,000		4.32	%	February 20, 2025	ii
Series G Unsecured Notes	75,000		75,000		4.10	%	June 13, 2025	ii
Series B Unsecured Notes	50,000		50,000		4.98	%	July 1, 2026	ii
Series C Unsecured Notes	80,000		80,000		4.42	%	December 30, 2026	ii
Series E Unsecured Notes	20,000		20,000		4.42	%	February 20, 2027	ii
Series H Unsecured Notes	100,000		100,000		4.27	%	June 13, 2028	ii
Total unsecured notes	575,000		575,000
Less: Total unamortized deferred financing fees and debt issuance costs	(2,217)		(2,512)
Total carrying value unsecured notes, net	572,783		572,488
Mortgage notes (secured debt):
Wells Fargo Bank, National Association CMBS Loan	51,861		53,216		4.31	%	December 1, 2022	iii
Thrivent Financial for Lutherans	3,709		3,795		4.78	%	December 15, 2023	iv
Total mortgage notes	55,570		57,011
Add: Total unamortized fair market value premiums	42		50
Less: Total unamortized deferred financing fees and debt issuance costs	(402)		(501)
Total carrying value mortgage notes, net	55,210		56,560
Total / weighted average interest rate (6)	$	1,477,030	$	1,325,908	3.58	%

(1)Interest rate as of September 30, 2019. At September 30, 2019, the one-month LIBOR (“L”) was 2.01563%. The current interest rate is not adjusted to include the amortization of deferred financing fees or debt issuance costs incurred in obtaining debt or any unamortized fair market value premiums. The spread over the applicable rate for the Company’s unsecured credit facility and unsecured term loans is based on the Company’s debt rating, as defined in the respective loan agreements.

(2)As of September 30, 2019, one-month LIBOR for the Unsecured Term Loans A, B, C, D, E, and F was swapped to a fixed rate of 1.70%, 2.05%, 1.39%, 1.85%, 2.92%, and 2.11%, respectively.

(3)Prepayment terms consist of (i) pre-payable with no penalty; (ii) pre-payable with penalty; (iii) pre-payable without penalty three months prior to the maturity date, however can be defeased; and (iv) pre-payable without penalty three months prior to the maturity date.

(4)The capacity of the unsecured credit facility is $500.0 million. Deferred financing fees and debt issuance costs, net of accumulated amortization related to the unsecured credit facility of approximately $2.6 million and $3.2 million is included in prepaid expenses and other assets on the accompanying Consolidated Balance Sheets as of September 30, 2019 and December 31, 2018, respectively.

(5)Capacity of $200.0 million, which the Company has until July 12, 2020 to draw.

(6)The weighted average interest rate was calculated using the fixed interest rate swapped on the notional amount of $775.0 million of debt, and is not adjusted to include the amortization of deferred financing fees or debt issuance costs incurred in obtaining debt or any unamortized fair market value premiums.

14

The aggregate undrawn nominal commitment on the unsecured credit facility and unsecured term loans as of September 30, 2019 was approximately $616.0 million, including issued letters of credit. The Company’s actual borrowing capacity at any given point in time may be less and is restricted to a maximum amount based on the Company’s debt covenant compliance. Total accrued interest for the Company’s indebtedness was approximately $7.6 million and $5.9 million as of September 30, 2019 and December 31, 2018, respectively, and is included in accounts payable, accrued expenses and other liabilities on the accompanying Consolidated Balance Sheets.

The following table summarizes the costs included in interest expense related to the Company’s debt arrangements on the accompanying Consolidated Statement of Operations for the three and nine months ended September 30, 2019 and 2018.

	Three months ended September 30,				Nine months ended September 30,
Costs Included in Interest Expense (in thousands)	2019		2018		2019		2018
Amortization of deferred financing fees and debt issuance costs and fair market value premiums	$	673	$	617	$	1,909	$	1,698
Facility, unused, and other fees	$	348	$	275	$	1,118	$	928

On July 25, 2019, the Company drew $175.0 million of the $175.0 million Unsecured Term Loan E that was entered into on July 26, 2018.

On July 12, 2019, the Company entered into the $200.0 million unsecured Unsecured Term Loan F. As of September 30, 2019, the interest rate on the Unsecured Term Loan F was LIBOR plus a spread of 1.00% based on the Company’s debt rating, as defined in the loan agreement. Unless otherwise terminated pursuant to the loan agreement, the Unsecured Term Loan F will mature on January 12, 2025. The Unsecured Term Loan F has a feature that allows the Company to request an increase in the aggregate size of the unsecured term loan of up to $400.0 million, subject to the satisfaction of certain conditions and lender consents. The agreement includes a delayed draw feature that allows the Company to draw up to six advances of at least $25.0 million each until July 12, 2020. To the extent that the Company does not request advances of the $200.0 million of aggregate commitments by July 12, 2020, the unadvanced commitments terminate. The Unsecured Term Loan F has an unused commitment fee equal to 0.15% of its unused commitments, which began to accrue on October 10, 2019 and is due and payable monthly until the earlier of (i) the date that aggregate commitments of $200.0 million have been fully advanced, (ii) July 12, 2020, and (iii) the date that aggregate commitments have been reduced to zero pursuant to the terms of the agreement. The Company is required to pay an annual administrative agent fee of $35,000. The Company and certain wholly owned subsidiaries of the Operating Partnership are guarantors of the Unsecured Term Loan F. The agreement also contains financial and other covenants substantially similar to the covenants in the Company's unsecured credit facility. As of September 30, 2019, no amounts were outstanding under the Unsecured Term Loan F.

Financial Covenant Considerations

The Company was in compliance with all financial and other covenants as of September 30, 2019 and December 31, 2018 related to its unsecured credit facility, unsecured term loans, unsecured notes, and mortgage notes. The real estate net book value of the properties that are collateral for the Company’s debt arrangements was approximately $86.0 million and $88.2 million at September 30, 2019 and December 31, 2018, respectively, and is limited to senior, property-level secured debt financing arrangements.

15

Fair Value of Debt

The following table summarizes the aggregate principal outstanding under the Company’s debt arrangements and the corresponding estimate of fair value as of September 30, 2019 and December 31, 2018.

	September 30, 2019				December 31, 2018
Indebtedness (in thousands)	Principal Outstanding		Fair Value		Principal Outstanding		Fair Value
Unsecured credit facility	$	78,000	$	78,000	$	100,500	$	100,500
Unsecured term loans	775,000		775,000		600,000		600,000
Unsecured notes	575,000		618,594		575,000		585,292
Mortgage notes	55,570		56,627		57,011		57,289
Total principal amount	1,483,570		$	1,528,221	1,332,511		$	1,343,081
Add: Total unamortized fair market value premiums	42				50
Less: Total unamortized deferred financing fees and debt issuance costs	(6,582)				(6,653)
Total carrying value	$	1,477,030			$	1,325,908

The applicable fair value guidance establishes a three tier value hierarchy, which prioritizes the inputs used in measuring fair value. These tiers include: Level 1, defined as observable inputs such as quoted prices in active markets; Level 2, defined as inputs other than quoted prices in active markets that are either directly or indirectly observable; and Level 3, defined as unobservable inputs in which little or no market data exists, therefore requiring an entity to develop its own assumptions. The fair value of the Company’s debt is based on Level 3 inputs.

5. Derivative Financial Instruments

Risk Management Objective of Using Derivatives

The Company’s use of derivative instruments is limited to the utilization of interest rate swaps to manage interest rate risk exposure on existing and future liabilities and not for speculative purposes. The principal objective of such arrangements is to minimize the risks and related costs associated with the Company’s operating and financial structure.

16

The following table summarizes the Company’s outstanding interest rate swaps as of September 30, 2019. All of the Company’s interest rate swaps are designated as qualifying cash flow hedges.

Interest Rate Derivative Counterparty	Trade Date	Effective Date	Notional Amount (in thousands)		Fair Value (in thousands)		Pay Fixed Interest Rate		Receive Variable Interest Rate	Maturity Date
Regions Bank	Mar-01-2013	Mar-01-2013	$	25,000	$	51	1.3300	%	One-month L	Feb-14-2020
Capital One, N.A.	Jun-13-2013	Jul-01-2013	$	50,000	$	35	1.6810	%	One-month L	Feb-14-2020
Capital One, N.A.	Jun-13-2013	Aug-01-2013	$	25,000	$	16	1.7030	%	One-month L	Feb-14-2020
Regions Bank	Sep-30-2013	Feb-03-2014	$	25,000	$	(12)	1.9925	%	One-month L	Feb-14-2020
The Toronto-Dominion Bank	Oct-14-2015	Sep-29-2016	$	25,000	$	66	1.3830	%	One-month L	Sep-29-2020
PNC Bank, N.A.	Oct-14-2015	Sep-29-2016	$	50,000	$	128	1.3906	%	One-month L	Sep-29-2020
Regions Bank	Oct-14-2015	Sep-29-2016	$	35,000	$	91	1.3858	%	One-month L	Sep-29-2020
U.S. Bank, N.A.	Oct-14-2015	Sep-29-2016	$	25,000	$	63	1.3950	%	One-month L	Sep-29-2020
Capital One, N.A.	Oct-14-2015	Sep-29-2016	$	15,000	$	38	1.3950	%	One-month L	Sep-29-2020
Royal Bank of Canada	Jan-08-2015	Mar-20-2015	$	25,000	$	(56)	1.7090	%	One-month L	Mar-21-2021
The Toronto-Dominion Bank	Jan-08-2015	Mar-20-2015	$	25,000	$	(57)	1.7105	%	One-month L	Mar-21-2021
The Toronto-Dominion Bank	Jan-08-2015	Sep-10-2017	$	100,000	$	(982)	2.2255	%	One-month L	Mar-21-2021
Wells Fargo, N.A.	Jan-08-2015	Mar-20-2015	$	25,000	$	(246)	1.8280	%	One-month L	Mar-31-2022
The Toronto-Dominion Bank	Jan-08-2015	Feb-14-2020	$	25,000	$	(579)	2.4535	%	One-month L	Mar-31-2022
Regions Bank	Jan-08-2015	Feb-14-2020	$	50,000	$	(1,181)	2.4750	%	One-month L	Mar-31-2022
Capital One, N.A.	Jan-08-2015	Feb-14-2020	$	50,000	$	(1,238)	2.5300	%	One-month L	Mar-31-2022
The Toronto-Dominion Bank	Jul-20-2017	Oct-30-2017	$	25,000	$	(362)	1.8485	%	One-month L	Jan-04-2023
Royal Bank of Canada	Jul-20-2017	Oct-30-2017	$	25,000	$	(364)	1.8505	%	One-month L	Jan-04-2023
Wells Fargo, N.A.	Jul-20-2017	Oct-30-2017	$	25,000	$	(364)	1.8505	%	One-month L	Jan-04-2023
PNC Bank, N.A.	Jul-20-2017	Oct-30-2017	$	25,000	$	(362)	1.8485	%	One-month L	Jan-04-2023
PNC Bank, N.A.	Jul-20-2017	Oct-30-2017	$	50,000	$	(723)	1.8475	%	One-month L	Jan-04-2023
The Toronto-Dominion Bank	Jul-24-2018	Jul-26-2019	$	50,000	$	(3,229)	2.9180	%	One-month L	Jan-12-2024
PNC Bank, N.A.	Jul-24-2018	Jul-26-2019	$	50,000	$	(3,232)	2.9190	%	One-month L	Jan-12-2024
Bank of Montreal	Jul-24-2018	Jul-26-2019	$	50,000	$	(3,232)	2.9190	%	One-month L	Jan-12-2024
U.S. Bank, N.A.	Jul-24-2018	Jul-26-2019	$	25,000	$	(1,616)	2.9190	%	One-month L	Jan-12-2024
Wells Fargo, N.A.	May-02-2019	Jul-15-2020	$	50,000	$	(2,030)	2.2460	%	One-month L	Jan-15-2025
U.S. Bank, N.A.	May-02-2019	Jul-15-2020	$	50,000	$	(2,029)	2.2459	%	One-month L	Jan-15-2025
Regions Bank	May-02-2019	Jul-15-2020	$	50,000	$	(2,032)	2.2459	%	One-month L	Jan-15-2025
Bank of Montreal	Jul-16-2019	Jul-15-2020	$	50,000	$	(886)	1.7165	%	One-month L	Jan-15-2025

The following table summarizes the fair value of the interest rate swaps outstanding as of September 30, 2019 and December 31, 2018.

Balance Sheet Line Item (in thousands)	Notional Amount September 30, 2019		Fair Value September 30, 2019		Notional Amount December 31, 2018		Fair Value December 31, 2018
Interest rate swaps-Asset	$	250,000	$	488	$	600,000	$	9,151
Interest rate swaps-Liability	$	850,000	$	(24,812)	$	300,000	$	(4,011)

Cash Flow Hedges of Interest Rate Risk

The Company’s objectives in using interest rate swaps are to add stability to interest expense and to manage its exposure to interest rate movements. 

For derivatives designated and that qualify as cash flow hedges of interest rate risk, the gain or loss on the derivative is recorded in accumulated other comprehensive income (loss) and subsequently reclassified into interest expense in the same periods during which the hedged transaction affects earnings.

Amounts reported in accumulated other comprehensive income (loss) related to derivatives designated as qualifying cash flow hedges will be reclassified to interest expense as interest payments are made on the Company’s variable rate debt. The Company estimates that approximately $3.8 million will be reclassified from accumulated other comprehensive income (loss) as an increase to interest expense over the next 12 months.

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The following table summarizes the effect of cash flow hedge accounting and the location in the consolidated financial statements for the three and nine months ended September 30, 2019 and 2018.

	Three months ended September 30,				Nine months ended September 30,
Effect of Cash Flow Hedge Accounting (in thousands)	2019		2018		2019		2018
Income (loss) recognized in accumulated other comprehensive income (loss) on interest rate swaps	$	(5,913)	$	2,572	$	(26,715)	$	13,349
Income reclassified from accumulated other comprehensive income (loss) into income as interest expense	$	522	$	512	$	2,726	$	538
Total interest expense presented in the Consolidated Statements of Operations in which the effects of cash flow hedges are recorded	$	14,053	$	12,698	$	39,080	$	35,602

Credit-risk-related Contingent Features

The Company has agreements with each of its derivative counterparties that contain a provision where the Company could be declared in default on its derivative obligations if repayment of the underlying indebtedness is accelerated by the lender due to the Company’s default on the indebtedness.

As of September 30, 2019, the Company had not breached the provisions of these agreements and had not posted any collateral related to these agreements. If the Company had breached any of these provisions at September 30, 2019, it could have been required to settle its obligations under the agreement of the interest rate swaps in a net liability position by counterparty plus accrued interest for approximately $24.6 million.

Fair Value of Interest Rate Swaps

The Company’s valuation of the interest rate swaps 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 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.

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 itself and its counterparties. However, as of September 30, 2019 and December 31, 2018, the Company has assessed the significance of the impact of the credit valuation adjustments on the overall valuation of its derivative positions and has determined that the credit valuation adjustments are not significant to the overall valuation of its derivatives. As a result, the Company has determined that its derivative valuations in their entirety are classified in Level 2 of the fair value hierarchy.

The following table summarizes the Company’s financial instruments that are accounted for at fair value on a recurring basis as of September 30, 2019 and December 31, 2018. 

			Fair Value Measurements as of September 30, 2019 Using
Balance Sheet Line Item (in thousands)	Fair Value September 30, 2019		Level 1		Level 2		Level 3
Interest rate swaps-Asset	$	488	$	—	$	488	$	—
Interest rate swaps-Liability	$	(24,812)	$	—	$	(24,812)	$	—

			Fair Value Measurements as ofDecember 31, 2018 Using
Balance Sheet Line Item (in thousands)	Fair Value December 31, 2018		Level 1		Level 2		Level 3
Interest rate swaps-Asset	$	9,151	$	—	$	9,151	$	—
Interest rate swaps-Liability	$	(4,011)	$	—	$	(4,011)	$	—

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6. Equity

Preferred Stock

On April 30, 2019, the Company filed Articles of Amendment to its Articles of Amendment and Restatement to increase the number of authorized shares of preferred stock from 15,000,000 to 20,000,000.

The following table summarizes the Company’s outstanding preferred stock issuances as of September 30, 2019.

Preferred Stock Issuances	Issuance Date	Number of Shares	Liquidation Value Per Share		Interest Rate
6.875% Series C Cumulative Redeemable Preferred Stock ("Series C Preferred Stock")	March 17, 2016	3,000,000	$	25.00	6.875	%

The following tables summarize the dividends attributable to the Company’s outstanding preferred stock issuances during the nine months ended September 30, 2019 and the year ended December 31, 2018.

Quarter Ended 2019	Declaration Date	Series C Preferred Stock Per Share		Payment Date
September 30	July 15, 2019	$	0.4296875	September 30, 2019
June 30	April 9, 2019	0.4296875		July 1, 2019
March 31	January 10, 2019	0.4296875		April 1, 2019
Total		$	1.2890625

Quarter Ended 2018	Declaration Date	Series B Preferred Stock Per Share			Series C Preferred Stock Per Share		Payment Date
December 31	October 10, 2018	$	—		$	0.4296875	December 31, 2018
September 30	July 11, 2018	0.0460069		(1)	0.4296875		October 1, 2018
June 30	April 10, 2018	0.4140625			0.4296875		July 2, 2018
March 31	February 14, 2018	0.4140625			0.4296875		April 2, 2018
Total		$	0.8741319		$	1.7187500

(1)On June 11, 2018, the Company gave notice to redeem all 2,800,000 issued and outstanding shares of the 6.625% Series B Cumulative Redeemable Preferred Stock (“Series B Preferred Stock”). On July 11, 2018, the Company redeemed all of the Series B Preferred Stock at a cash redemption price of $25.00 per share, plus accrued and unpaid dividends to but excluding the redemption date, without interest.

On October 15, 2019, the Company’s board of directors declared the Series C Preferred Stock dividends for the quarter ending December 31, 2019 at a quarterly rate of $0.4296875 per share.

Common Stock

On April 30, 2019, the Company filed Articles of Amendment to its Articles of Amendment and Restatement to increase the number of authorized shares of the Company’s common stock from 150,000,000 to 300,000,000.

The following table summarizes the terms of the Company’s at-the market (“ATM”) common stock offering program as of September 30, 2019.

ATM Common Stock Offering Program	Date	Maximum Aggregate Offering Price (in thousands)		Aggregate Common Stock Available as of September 30, 2019 (in thousands)
2019 $600 million ATM	February 14, 2019	$	600,000	$	401,137

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The following tables summarize the activity under the ATM common stock offering programs during the nine months ended September 30, 2019 and year ended December 31, 2018 (in thousands, except share data).

	Nine months ended September 30, 2019
ATM Common Stock Offering Program	Shares Sold	Weighted Average Price Per Share		Net Proceeds
2019 $600 million ATM	7,022,332	$	28.32	$	197,074
Total/weighted average	7,022,332	$	28.32	$	197,074

	Year ended December 31, 2018
ATM Common Stock Offering Program	Shares Sold	Weighted Average Price Per Share		Net Proceeds
2017 $500 million ATM (1)	14,724,614	$	26.52	$	386,407
Total/weighted average	14,724,614	$	26.52	$	386,407

(1) This program ended in February 2019.

On September 24, 2019, the Company completed an underwritten public offering of an aggregate 12,650,000 shares of common stock at a price to the underwriters of $28.60 per share, consisting of (i) 5,500,000 shares offered directly by the Company and (ii) 7,150,000 shares offered by the forward dealer in connection with certain forward sale agreements (including 1,650,000 shares offered pursuant to the underwriters’ option to purchase additional shares, which option was exercised in full). The offering closed on September 27, 2019 and the Company received net proceeds from the sale of shares offered directly by the Company of $157.3 million. Subject to the Company's right to elect cash or net share settlement, the Company has the ability to settle the forward sales agreements at any time through scheduled maturity date of the forward sale agreements of September 24, 2020.

On April 1, 2019, the Company completed an underwritten public offering of 7,475,000 shares of common stock (including 975,000 shares issued pursuant to the underwriters’ option to purchase additional shares, which option was exercised in full) at a price to the underwriters of $28.72 per share. The offering closed on April 4, 2019 and the Company received net proceeds of approximately $214.7 million.

The following tables summarize the dividends attributable to the Company’s outstanding shares of common stock that were declared during the nine months ended September 30, 2019 and the year ended December 31, 2018.

Month Ended 2019	Declaration Date	Record Date	Per Share		Payment Date
September 30	July 15, 2019	September 30, 2019	$	0.119167	October 15, 2019
August 31	July 15, 2019	August 30, 2019	0.119167		September 16, 2019
July 31	July 15, 2019	July 31, 2019	0.119167		August 15, 2019
June 30	April 9, 2019	June 28, 2019	0.119167		July 15, 2019
May 31	April 9, 2019	May 31, 2019	0.119167		June 17, 2019
April 30	April 9, 2019	April 30, 2019	0.119167		May 15, 2019
March 31	January 10, 2019	March 29, 2019	0.119167		April 15, 2019
February 28	January 10, 2019	February 28, 2019	0.119167		March 15, 2019
January 31	January 10, 2019	January 31, 2019	0.119167		February 15, 2019
Total			$	1.072503

Month Ended 2018	Declaration Date	Record Date	Per Share		Payment Date
December 31	October 10, 2018	December 31, 2018	$	0.118333	January 15, 2019
November 30	October 10, 2018	November 30, 2018	0.118333		December 17, 2018
October 31	October 10, 2018	October 31, 2018	0.118333		November 15, 2018
September 30	July 11, 2018	September 28, 2018	0.118333		October 15, 2018
August 31	July 11, 2018	August 31, 2018	0.118333		September 17, 2018
July 31	July 11, 2018	July 31, 2018	0.118333		August 15, 2018
June 30	April 10, 2018	June 29, 2018	0.118333		July 16, 2018
May 31	April 10, 2018	May 31, 2018	0.118333		June 15, 2018
April 30	April 10, 2018	April 30, 2018	0.118333		May 15, 2018
March 31	November 2, 2017	March 29, 2018	0.118333		April 16, 2018
February 28	November 2, 2017	February 28, 2018	0.118333		March 15, 2018
January 31	November 2, 2017	January 31, 2018	0.118333		February 15, 2018
Total			$	1.419996

20

On October 15, 2019, the Company’s board of directors declared the common stock dividends for the months ending October 31, 2019, November 30, 2019, and December 31, 2019 at a monthly rate of $0.119167 per share of common stock.

Restricted Shares of Common Stock

Restricted shares of common stock granted on January 7, 2019 to certain employees of the Company, subject to the recipient’s continued employment, will vest in four equal installments on January 1 of each year beginning in 2020. Refer to Note 8 for a discussion of the restricted shares of common stock granted on January 7, 2019 pursuant to the March 8, 2016 performance units. The following table summarizes activity related to the Company’s unvested restricted shares of common stock for the nine months ended September 30, 2019 and the year ended December 31, 2018.

Unvested Restricted Shares of Common Stock	Shares
Balance at December 31, 2017	237,207
Granted	76,659	(1)
Vested	(112,405)	(2)
Forfeited	(10,999)
Balance at December 31, 2018	190,462
Granted	110,830	(1)
Vested	(78,431)	(2)
Forfeited	(2,589)
Balance at September 30, 2019	220,272

(1)The fair value per share on the grant date of January 7, 2019 and January 5, 2018 was $24.85 and $26.40, respectively.

(2)The Company repurchased and retired 58,697 and 41,975 restricted shares of common stock that vested during the nine months ended September 30, 2019 and the year ended December 31, 2018, respectively.

The unrecognized compensation expense associated with the Company’s restricted shares of common stock at September 30, 2019 was approximately $3.4 million and is expected to be recognized over a weighted average period of approximately 2.5 years.

The following table summarizes the fair value at vesting for the restricted shares of common stock that vested during the three and nine months ended September 30, 2019 and 2018.

	Three months ended September 30,				Nine months ended September 30,
Vested Restricted Shares of Common Stock	2019		2018		2019		2018
Vested restricted shares of common stock	—		—		78,431		112,405
Fair value of vested restricted shares of common stock (in thousands)	$	—	$	—	$	1,951	$	3,002

7. Noncontrolling Interest

The following table summarizes the activity for noncontrolling interest in the Company for the nine months ended September 30, 2019 and the year ended December 31, 2018.

Noncontrolling Interest	LTIP Units	Other Common Units	Total Noncontrolling Common Units	Noncontrolling Interest
Balance at December 31, 2017	1,457,070	2,639,617	4,096,687	4.1	%
Granted/Issued	324,802	—	324,802	N/A
Forfeited	—	—	—	N/A
Conversions from LTIP units to Other Common Units	(165,672)	165,672	—	N/A
Redemptions from Other Common Units to common stock	—	(352,055)	(352,055)	N/A
Balance at December 31, 2018	1,616,200	2,453,234	4,069,434	3.5	%
Granted/Issued	364,173	—	364,173	N/A
Forfeited	(10,208)	—	(10,208)	N/A
Conversions from LTIP units to Other Common Units	(262,847)	262,847	—	N/A
Redemptions from Other Common Units to common stock	—	(661,082)	(661,082)	N/A
Balance at September 30, 2019	1,707,318	2,054,999	3,762,317	2.8	%

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LTIP Units

LTIP units granted on January 7, 2019 to non-employee, independent directors, subject to the recipient’s continued service, will vest on January 1, 2020. LTIP units granted on January 7, 2019 to certain senior executive officers and senior employees, subject to the recipient’s continued employment, will vest quarterly over four years, with the first vesting date having been March 31, 2019. Refer to Note 8 for a discussion of the LTIP units granted on January 7, 2019 pursuant to the March 8, 2016 performance units.

The fair value of the LTIP units at the date of grant was determined by a lattice-binomial option-pricing model based on a Monte Carlo simulation. The fair value of the LTIP units are based on Level 3 inputs and are non-recurring fair value measurements. The following table summarizes the assumptions used in valuing such LTIP units granted during the nine months ended September 30, 2019 (excluding those LTIP units granted pursuant to the March 8, 2016 performance units; refer to Note 8 for details).

LTIP Units	Assumptions
Grant date	January 7, 2019
Expected term (years)	10
Expected volatility	19.0		%
Expected dividend yield	6.0		%
Risk-free interest rate	2.57		%
Fair value of LTIP units at issuance (in thousands)	$	3,636
LTIP units at issuance	154,649
Fair value unit price per LTIP unit at issuance	$	23.51

The following table summarizes activity related to the Company’s unvested LTIP units for the nine months ended September 30, 2019 and the year ended December 31, 2018.

Unvested LTIP Units	LTIP Units
Balance at December 31, 2017	300,307
Granted	324,802
Vested	(373,893)
Forfeited	—
Balance at December 31, 2018	251,216
Granted	364,173
Vested	(234,330)
Forfeited	(10,208)
Balance at September 30, 2019	370,851

The unrecognized compensation expense associated with the Company’s LTIP units at September 30, 2019 was approximately $5.5 million and is expected to be recognized over a weighted average period of approximately 2.3 years.

The following table summarizes the fair value at vesting for the LTIP units that vested during the three and nine months ended September 30, 2019 and 2018.

	Three months ended September 30,				Nine months ended September 30,
Vested LTIP units	2019		2018		2019		2018
Vested LTIP units	29,989		30,949		234,330		342,940
Fair value of vested LTIP units (in thousands)	$	884	$	851	$	6,348	$	9,002

8. Equity Incentive Plan

On January 7, 2019, the Company granted performance units approved by the compensation committee of the board of directors under the 2011 Plan to certain key employees of the Company. The terms of the performance units granted on January 7, 2019 are substantially the same as the terms of the performance units granted on January 5, 2018 and January 6, 2017, except that the measuring period commences on January 1, 2019 and ends on December 31, 2021, and the award shares are immediately vested at the end of the measuring period.

22

The fair value of the performance units at the date of grant was determined by a lattice-binomial option-pricing model based on a Monte Carlo simulation. The fair value of the performance units are based on Level 3 inputs and are non-recurring fair value measurements. The performance unit equity compensation expense is recognized ratably from the grant date into earnings over the vesting period. The following table summarizes the assumptions used in valuing the performance units granted during the nine months ended September 30, 2019.

Performance Units	Assumptions
Grant date	January 7, 2019
Expected volatility	20.7		%
Expected dividend yield	6.0		%
Risk-free interest rate	2.56		%
Fair value of performance units grant (in thousands)	$	5,620

On December 31, 2018, the Company’s three year measurement period pursuant to the March 8, 2016 performance units concluded. It was determined that the Company’s total stockholder return exceeded the threshold percentage and return hurdle. The compensation committee of the board of directors approved the issuance of 102,216 vested LTIP units and 74,032 vested shares of common stock (of which 30,193 shares of common stock were repurchased and retired) to the participants, which were issued on January 7, 2019. The compensation committee of the board of directors also approved the issuance of 107,308 LTIP units and 22,678 restricted shares of common stock that will vest on December 31, 2019, which were issued on January 7, 2019.

The unrecognized compensation expense associated with the Company’s performance units at September 30, 2019 was approximately $7.0 million and is expected to be recognized over a weighted average period of approximately 2.0 years.

Non-cash Compensation Expense

The following table summarizes the amount recorded in general and administrative expenses in the accompanying Consolidated Statements of Operations for the amortization of restricted shares of common stock, LTIP units, performance units, and the Company’s director compensation for the three and nine months ended September 30, 2019 and 2018.

	Three months ended September 30,				Nine months ended September 30,
Non-Cash Compensation Expense (in thousands)	2019		2018		2019		2018
Restricted shares of common stock	$	447	$	406	$	1,318	$	1,269
LTIP units	901		893		2,687		2,654
Performance units	1,107		838		3,062		2,463
Director compensation (1)	101		99		304		285
Total non-cash compensation expense	$	2,556	$	2,236	$	7,371	$	6,671

(1)All of the Company’s independent directors elected to receive shares of common stock in lieu of cash for their service during the three and nine months ended September 30, 2019 and 2018. The number of shares of common stock granted is calculated based on the trailing 10 days average common stock price ending on the third business day preceding the grant date.

9. Leases

Lessor Leases

The Company has operating leases in which it is the lessor for its rental property. Certain leases contain variable lease payments based upon changes in the Consumer Price Index (“CPI”). Certain leases contain options to renew or terminate the lease, and options for the lessee to purchase the rental property, all of which are predominately at the sole discretion of the lessee.

23

The following table summarizes the components of rental income recognized during the three and nine months ended September 30, 2019 included in the accompanying Consolidated Statements of Operations.

	Three months ended September 30,		Nine months ended September 30,
Rental Income (in thousands)	2019		2019
Fixed lease payments	$	80,262	$	227,337
Variable lease payments	20,189		61,628
Straight-line rental income	3,091		8,667
Net decrease to rental income related to above and below market lease amortization	(1,248)		(3,361)
Total rental income	$	102,294	$	294,271

As of September 30, 2019, the Company had accrued rental income of approximately $40.2 million included in tenant accounts receivable on the accompanying Consolidated Balance Sheets. As of December 31, 2018, the Company had accrued rental income of approximately $32.4 million, net of allowance for doubtful accounts of approximately $0.8 million, included in tenant accounts receivable on the accompanying Consolidated Balance Sheets.

As of September 30, 2019 and December 31, 2018, the Company had approximately $20.5 million and $18.3 million, respectively, of total lease security deposits available in the form of existing letters of credit, which are not reflected on the accompanying Consolidated Balance Sheets. As of September 30, 2019 and December 31, 2018, the Company had approximately $0.7 million and $0.7 million, respectively, of lease security deposits available in cash, which are included in restricted cash on the accompanying Consolidated Balance Sheets. The Company’s remaining lease security deposits are commingled in cash and cash equivalents. These funds may be used to settle tenant accounts receivables in the event of a default under the related lease. As of September 30, 2019 and December 31, 2018, the Company’s total liability associated with these lease security deposits was approximately $9.2 million and $8.4 million, respectively, and is included in tenant prepaid rent and security deposits on the accompanying Consolidated Balance Sheets.

The Company estimates that billings for real estate taxes, which are the responsibility of certain tenants under the terms of their leases and are not reflected on the Company’s consolidated financial statements, was approximately $5.1 million, $13.1 million, $3.8 million and $10.9 million for the three and nine months ended September 30, 2019 and 2018, respectively. These amounts would have been the maximum real estate tax expense of the Company, excluding any penalties or interest, had the tenants not met their contractual obligations for these periods.

The following table summarizes the maturity of fixed lease payments under the Company’s leases as of September 30, 2019.

Year (as of September 30, 2019)	Maturity of Fixed Lease Payments (in thousands)
Remainder of 2019	$	82,584
2020	$	325,907
2021	$	285,414
2022	$	249,287
2023	$	208,011
Thereafter	$	761,469

The following table summarizes the minimum contractual lease payments under the superseded leases standard, Topic 840, as of December 31, 2018.

Year (as of December 31, 2018)	Future Minimum Rents (in thousands)
2019	$	299,978
2020	$	271,936
2021	$	226,970
2022	$	188,707
2023	$	152,814
Thereafter	$	535,192

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Lessee Leases

The Company has operating leases in which it is the lessee for ground leases and its corporate office lease. These leases have remaining lease terms of approximately 1.5 years to 47.3 years. Certain ground leases contain options to extend the leases for ten years to 20 years, all of which are reasonably certain to be exercised, and are included in the computation of the Company’s right-of-use assets and operating lease liabilities.

The following table summarizes supplemental information related to operating lease right-of-use assets and operating lease liabilities recognized in the Company’s Consolidated Balance Sheets as of September 30, 2019.

Operating Lease Term and Discount Rate	September 30, 2019
Weighted average remaining lease term (years)	35.7
Weighted average discount rate	7.1	%

The following table summarizes the operating lease cost recognized during the three and nine months ended September 30, 2019 included in the Company’s Consolidated Statements of Operations.

	Three months ended September 30,		Nine months ended September 30,
Operating Lease Cost (in thousands)	2019		2019
Operating lease cost included in property expense attributable to ground leases	$	331	$	993
Operating lease cost included in general and administrative expense attributable to corporate office lease	266		799
Total operating lease cost	$	597	$	1,792

The following table summarizes supplemental cash flow information related to operating leases recognized during the nine months ended September 30, 2019 in the Company’s Consolidated Statements of Cash Flows.

	Nine months ended September 30,
Operating Leases (in thousands)	2019
Cash paid for amounts included in the measurement of lease liabilities (operating cash flows)	$	1,711

The following table summarizes the maturity of operating lease liabilities under the Company’s ground leases and corporate office lease as of September 30, 2019.

Year (as of September 30, 2019)	Maturity of Operating Lease Liabilities(1) (in thousands)
Remainder of 2019	$	571
2020	2,294
2021	1,400
2022	1,107
2023	1,116
Thereafter	48,155
Total lease payments	54,643
Less: Imputed interest	(37,384)
Present value of operating lease liabilities	$	17,259

(1)Operating lease liabilities do not include estimates of CPI rent changes required by certain ground lease agreements. Therefore, actual payments may differ than those presented.

25

The following table summarizes the minimum contractual lease payments under the superseded leases standard, Topic 840, as of December 31, 2018.

Year (as of December 31, 2018)	Future Minimum Rental Payments (1) (in thousands)
2019	$	2,110
2020	$	2,122
2021	$	1,227
2022	$	935
2023	$	944
Thereafter	$	45,580

(1)Future minimum rental payments do not include estimates of CPI rent changes required by certain lease agreements. Therefore, actual minimum rental payments may differ than those presented.

10. Earnings Per Share

During the three and nine months ended September 30, 2019 and 2018, there were 220,284, 218,231, 193,117 and 196,871, respectively, of unvested restricted shares of common stock on a weighted average basis that were considered participating securities.

The following table reconciles the numerators and denominators in the computation of basic and diluted earnings per common share for the three and nine months ended September 30, 2019 and 2018.

	Three months ended September 30,				Nine months ended September 30,
Earnings Per Share (in thousands, except per share data)	2019		2018		2019		2018
Numerator
Net income attributable to common stockholders	$	9,533	$	7,237	$	27,734	$	38,215
Denominator
Weighted average common shares outstanding — basic	127,272		105,783		122,460		101,095
Effect of dilutive securities(1)
Share-based compensation	178		550		254		400
Shares issuable under forward sales agreements	19		—		6		—
Weighted average common shares outstanding — diluted	127,469		106,333		122,720		101,495
Net income per share — basic and diluted
Net income per share attributable to common stockholders — basic	$	0.07	$	0.07	$	0.23	$	0.38
Net income per share attributable to common stockholders — diluted	$	0.07	$	0.07	$	0.23	$	0.38

(1)During the three and nine months ended September 30, 2019 and 2018, there were 220, 218, 193 and 197, unvested shares of restricted common stock, respectively, on a weighted average basis that were not included in the computation of diluted earnings per share because the allocation of income under the two-class method was more dilutive.

11. Commitments and Contingencies

The Company is subject to various legal proceedings and claims that arise in the ordinary course of business. These matters are generally covered by insurance subject to deductible requirements. Management believes that the ultimate settlement of these actions will not have a material adverse effect on the Company’s financial position, results of operations, or cash flows.

The Company has letters of credit of approximately $6.0 million as of September 30, 2019 related to construction projects and certain other agreements. As of September 30, 2019, the Company has a development commitment related to a building expansion under a tenant lease of approximately $3.1 million.

12. Subsequent Events

There were no recognized or non-recognized subsequent events.

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Item 2. Management’s Discussion and Analysis of Financial Condition and Results of Operations

You should read the following discussion with the financial statements and related notes included elsewhere in Item 1 of this report and the audited financial statements and related notes thereto included in our most recent Annual Report on Form 10-K.

As used herein, except where the context otherwise requires, “Company,” “we,” “our” and “us,” refer to STAG Industrial, Inc. and our consolidated subsidiaries and partnerships, including our operating partnership, STAG Industrial Operating Partnership, L.P. (the “Operating Partnership”). 

Forward-Looking Statements

This report contains “forward-looking statements” within the meaning of the safe harbor from civil liability provided for such statements by the Private Securities Litigation Reform Act of 1995 (set forth in Section 27A of the Securities Act of 1933, as amended (the “Securities Act”), and Section 21E of the Securities Exchange Act of 1934, as amended (the “Exchange Act”)). You can identify forward-looking statements by the use of words such as “anticipates,” “believes,” “estimates,” “expects,” “intends,” “may,” “plans,” “projects,” “seeks,” “should,” “will,” and variations of such words or similar expressions. Forward-looking statements in this report include, among others, statements about our future financial condition, results of operations, capitalization rates on future acquisitions, our business strategy and objectives, including our acquisition strategy, occupancy and leasing rates and trends, and expected liquidity needs and sources (including capital expenditures and the ability to obtain financing or raise capital). Our forward-looking statements reflect our current views about our plans, intentions, expectations, strategies and prospects, which are based on the information currently available to us and on assumptions we have made. Although we believe that our plans, intentions, expectations, strategies and prospects as reflected in or suggested by our forward-looking statements are reasonable, we can give no assurance that our plans, intentions, expectations, strategies or prospects will be attained or achieved and you should not place undue reliance on these forward-looking statements. Furthermore, actual results may differ materially from those described in the forward-looking statements and may be affected by a variety of risks and factors including, without limitation:

•the factors included in our Annual Report on Form 10-K for the year ended December 31, 2018, as updated elsewhere in this report, including those set forth under the headings “Business,” “Risk Factors,” and “Management’s Discussion and Analysis of Financial Condition and Results of Operations;”

•our ability to raise equity capital on attractive terms;

•the competitive environment in which we operate;

•real estate risks, including fluctuations in real estate values and the general economic climate in local markets and competition for tenants in such markets;

•decreased rental rates or increased vacancy rates;

•potential defaults (including bankruptcies or insolvency) on or non-renewal of leases by tenants;

•acquisition risks, including our ability to identify and complete accretive acquisitions and/or failure of such acquisitions to perform in accordance with projections;

•the timing of acquisitions and dispositions;

•technological developments, particularly those affecting supply chains and logistics;

•potential natural disasters and other potentially catastrophic events such as acts of war and/or terrorism;

•international, national, regional and local economic conditions;

•the general level of interest rates and currencies;

•potential changes in the law or governmental regulations and interpretations of those laws and regulations, including changes in real estate and zoning laws or real estate investment trust (“REIT”) or corporate income tax laws, and potential increases in real property tax rates; 

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•financing risks, including the risks that our cash flows from operations may be insufficient to meet required payments of principal and interest and we may be unable to refinance our existing debt upon maturity or obtain new financing on attractive terms or at all; 

•credit risk in the event of non-performance by the counterparties to the interest rate swaps and revolving and unfunded debt;

•how and when pending forward equity sales may settle;

•lack of or insufficient amounts of insurance;

•our ability to maintain our qualification as a REIT;

•our ability to retain key personnel; 

•litigation, including costs associated with prosecuting or defending claims and any adverse outcomes; and

•possible environmental liabilities, including costs, fines or penalties that may be incurred due to necessary remediation of contamination of properties presently owned or previously owned by us.

Any forward-looking statement speaks only as of the date on which it is made. New risks and uncertainties arise over time, and it is not possible for us to predict those events or how they may affect us. Except as required by law, we are not obligated to, and do not intend to, update or revise any forward-looking statements, whether as a result of new information, future events or otherwise.

Certain Definitions

In this report:

We define “GAAP” as generally accepted accounting principles in the United States.

We define “total annualized base rental revenue” as the contractual monthly base rent as of September 30, 2019 (which differs from rent calculated in accordance with GAAP) multiplied by 12. If a tenant is in a free rent period as of September 30, 2019, the total annualized base rental revenue is calculated based on the first contractual monthly base rent amount multiplied by 12.

We define “occupancy rate” as the percentage of total leasable square footage for which either revenue recognition has commenced in accordance with GAAP or the lease term has commenced as of the close of the reporting period, whichever occurs earlier.

We define the “Value Add Portfolio” as properties that meet any of the following criteria: (i) less than 75% occupied as of the acquisition date; (ii) will be less than 75% occupied due to known move-outs within two years of the acquisition date; (iii) out of service with significant physical renovation of the asset; or (iv) development.

We define “Stabilization” for properties under development or being redeveloped as the earlier of achieving 90% occupancy or 12 months after completion. With respect to properties acquired and immediately added to the Value Add Portfolio, (i) if acquired with less than 75% occupancy as of the acquisition date, Stabilization will occur upon the earlier of achieving 90% occupancy or 12 months from the acquisition date; or (ii) if acquired and will be less than 75% occupied due to known move-outs within two years of the acquisition date, Stabilization will occur upon the earlier of achieving 90% occupancy after the known move-outs have occurred or 12 months after the known move-outs have occurred.

We define the “Operating Portfolio” as all warehouse and light manufacturing assets that were acquired stabilized or have achieved Stabilization. The Operating Portfolio excludes non-core flex/office assets and assets contained in the Value Add Portfolio.

We define a “Comparable Lease” as a lease in the same space with a similar lease structure as compared to the previous in-place lease, excluding new leases for space that was not occupied under our ownership.

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We define “SL Rent Change” as the percentage change in the average monthly base rent over the term of the lease that commenced during the period compared to the Comparable Lease for assets included in the Operating Portfolio. Rent under gross or similar type leases are converted to a net rent based on an estimate of the applicable recoverable expenses, and this calculation excludes the impact of any holdover rent.

We define “Cash Rent Change” as the percentage change in the base rent of the lease commenced during the period compared to the base rent of the Comparable Lease for assets included in the Operating Portfolio. The calculation compares the first base rent payment due after the lease commencement date compared to the base rent of the last monthly payment due prior to the termination of the lease, excluding holdover rent. Rent under gross or similar type leases are converted to a net rent based on an estimate of the applicable recoverable expenses.

We define a “New Lease” as any lease that is signed for an initial term equal to or greater than 12 months for any vacant space, including a lease signed by a new tenant or an existing tenant that is expanding into new (additional) space.

We define “Renewal” Lease as a lease signed by an existing tenant to extend the term for 12 months or more, including (i) a renewal of the same space as the current lease at lease expiration, (ii) a renewal of only a portion of the current space at lease expiration and (iii) an early renewal or workout, which ultimately does extend the original term for 12 months or more.

Overview

We are a REIT focused on the acquisition, ownership, and operation of single-tenant, industrial properties throughout the United States. We are a Maryland corporation and our common stock is publicly traded on the New York Stock Exchange under the symbol “STAG.”

We are organized and conduct our operations to qualify as a REIT under Sections 856 through 860 of the Internal Revenue Code of 1986, as amended, and generally are not subject to federal income tax to the extent we currently distribute our income to our stockholders and maintain our qualification as a REIT. We remain subject to state and local taxes on our income and property and to U.S. federal income and excise taxes on our undistributed income.

Factors That May Influence Future Results of Operations

Our ability to increase revenues or cash flow will depend in part on our (i) external growth, specifically acquisition activity, and (ii) internal growth, specifically occupancy and rental rates on our portfolio. A variety of other factors, including those noted below, also affect our future results of operations.

Outlook

The outlook for our business remains positive, albeit on a moderated basis in light of over ten years of economic growth, uncertainty regarding the current U.S. presidential administration and its policy initiatives, and continued asset appreciation. In the third quarter of 2019, the federal funds target rate was lowered twice, each by 25 basis points, to a target range of 1.75% to 2.0%. The Federal Reserve has signaled that it will support economic growth as needed. The current economic growth combined with the favorable industrial supply demand balance should translate to a net positive result for our business. Specifically, our existing portfolio should benefit from rising rental rates and strong occupancy. Furthermore, we believe certain characteristics of our business should position us well in an uncertain interest rate environment, including the fact that we have minimal floating rate debt exposure (taking into account our hedging activities) and that many of our competitors for the assets we purchase tend to be smaller local and regional investors who are likely to be more heavily impacted by interest rates.

Several industrial specific trends contribute to the expected strong demand, including:

•the rise of e-commerce (as compared to the traditional retail store distribution model) and the concomitant demand by e-commerce industry participants for well-located, functional distribution space;

•the increasing attractiveness of the U.S. as a manufacturing and distribution location because of the size of the U.S. consumer market, an increase in overseas labor costs and the overall cost of supplying and shipping goods (i.e. the shortening and fattening of the supply chain); and

•the overall quality of the transportation infrastructure in the U.S.

Our portfolio continues to benefit from historically low availability throughout the national industrial market. As of the most recent data, demand for space continues to support new supply and an accommodative environment for owners. Development

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activity has steadily increased over the past several years and is now reaching material levels in a growing number of primary industrial markets. Though availability remains historically low, this is a trend we will monitor closely. In addition, currently, the supply remains fairly concentrated in the larger primary industrial markets and we have limited exposure to many of these markets. On the demand side, we note that the quality and availability of labor remains a key focus of tenants making occupancy decisions. We will continue to monitor the supply and demand fundamentals for industrial real estate and assess its impact on our business.

Conditions in Our Markets

The buildings in our portfolio are located in markets throughout the United States. Positive or negative changes in economic or other conditions, new supply, adverse weather conditions and natural disasters, and other factors in these markets may affect our overall performance.

Rental Income

We receive income primarily in the form of rental income from the tenants who occupy our buildings. The amount of rental income generated by the buildings in our portfolio depends principally on occupancy and rental rates. As of September 30, 2019, our Operating Portfolio was approximately 95.6% leased and our SL Rent Change on new and renewal leases together grew approximately 16.5% and 20.1% during the three and nine months ended September 30, 2019, respectively.

Future economic downturns or regional downturns affecting our submarkets that impair our ability to renew or re-lease space and the ability of our tenants to fulfill their lease commitments, as in the case of tenant bankruptcies, could adversely affect our ability to maintain or increase rental rates at our buildings. Our ability to lease our properties and the attendant rental rate is dependent upon, among other things, (i) the overall economy, (ii) the supply/demand dynamic in our markets, (iii) the quality of our properties, including age, clear height, and configuration, and (iv) our tenants’ ability to meet their contractual obligations to us.

The following table summarizes our Operating Portfolio leases that commenced during the three and nine months ended September 30, 2019. Certain leases contain rental concessions; any such rental concessions are accounted for on a straight-line basis over the term of the lease.

Operating Portfolio	Square Feet	Cash Basis Rent Per Square Foot		SL Rent Per Square Foot		Total Costs Per Square Foot(1)		Cash Rent Change		SL Rent Change		Weighted Average Lease Term(2) (years)	Rental Concessions per Square Foot(3)
Three months ended September 30, 2019
New Leases	490,935	$	4.43	$	4.58	$	1.39	19.7	%	24.7	%	5.2	$	0.69
Renewal Leases	1,583,107	$	3.87	$	4.03	$	0.51	8.6	%	14.8	%	3.8	$	0.05
Total/weighted average	2,074,042	$	4.01	$	4.16	$	0.72	10.5	%	16.5	%	4.2	$	0.20
Nine months ended September 30, 2019
New Leases	1,168,842	$	3.99	$	4.14	$	1.55	18.8	%	28.2	%	5.7	$	0.77
Renewal Leases	6,005,521	$	4.00	$	4.16	$	0.67	10.3	%	18.9	%	4.0	$	0.01
Total/weighted average	7,174,363	$	3.99	$	4.16	$	0.82	11.4	%	20.1	%	4.3	$	0.14

(1)We define Total Costs as the costs for improvements of vacant and renewal spaces, as well as the contingent-based legal fees and commissions for leasing transactions. Total Costs per square foot represent the total costs expected to be incurred on the leases that commenced during the period and do not reflect actual expenditures for the period.

(2)We define weighted average lease term as the contractual lease term in years, assuming that tenants exercise no renewal options, purchase options, or early termination rights, weighted by square footage.

(3)Represents the total rental concessions for the entire lease term.

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Property Operating Expenses

Our property operating expenses generally consist of utilities, real estate taxes, management fees, insurance, and site repair and maintenance costs. For the majority of our tenants, our property operating expenses are controlled, in part, by the triple net provisions in tenant leases. In our triple net leases, the tenant is responsible for all aspects of and costs related to the building and its operation during the lease term, including utilities, taxes, insurance and maintenance costs, but typically excluding roof and building structure. However, we also have modified gross leases and gross leases in our building portfolio. The terms of those leases vary and on some occasions we may absorb certain building related expenses of our tenants. In our modified gross leases, we are responsible for some building related expenses during the lease term, but the cost of most of the expenses is passed through to the tenant for reimbursement to us. In our gross leases, we are responsible for all costs related to the building and its operation during the lease term. Our overall performance will be affected by the extent to which we are able to pass-through property operating expenses to our tenants.

Scheduled Lease Expirations

Our ability to re-lease space subject to expiring leases will impact our results of operations and is affected by economic and competitive conditions in our markets and by the desirability of our individual buildings. Leases that comprise approximately 6.6% of our annualized base rental revenue will expire during the period from October 1, 2019 to September 30, 2020, excluding month-to-month leases. We assume, based upon internal renewal probability estimates that some of our tenants will renew and others will vacate and the associated space will be re-let subject to downtime assumptions. Using the aforementioned assumptions, we expect that the rental rates on the respective new leases will generally be the same as the rates under existing leases expiring during the period October 1, 2019 to September 30, 2020, thereby resulting in approximately the same revenue from the same space.

The following table summarizes lease expirations for leases in place as of September 30, 2019, plus available space, for each of the ten calendar years beginning with 2019 and thereafter in our portfolio. The information in the table assumes that tenants exercise no renewal options and no early termination rights.

Lease Expiration Year	Number of Leases Expiring	Total Rentable Square Feet	% of Total Occupied Square Feet		Total Annualized Base Rental  Revenue (in thousands)		% of Total Annualized Base Rental Revenue
Available	—	4,461,560	—		—		—
Month-to-month leases	3	149,663	0.2	%	$	735	0.2	%
Remainder of 2019	5	663,727	0.8	%	2,651		0.7	%
2020	44	7,300,692	8.9	%	33,663		9.6	%
2021	74	11,654,228	14.3	%	50,740		14.3	%
2022	71	8,954,925	11.0	%	38,675		10.9	%
2023	73	11,265,564	13.8	%	43,763		12.4	%
2024	55	10,507,744	12.9	%	44,142		12.5	%
2025	33	6,486,218	8.0	%	27,023		7.6	%
2026	34	5,988,185	7.3	%	27,283		7.7	%
2027	18	2,619,630	3.2	%	12,847		3.6	%
2028	24	4,619,199	5.7	%	19,552		5.5	%
Thereafter	47	11,322,032	13.9	%	53,187		15.0	%
Total	481	85,993,367	100.0	%	$	354,261	100.0	%

Portfolio Summary

The following table summarizes information relating to diversification by building type in our portfolio as of September 30, 2019.

		Square Footage					Annualized Base Rental Revenue
Building Type	Number of Buildings	Amount	%		Occupancy Rate		Amount (in thousands)		%
Warehouse/Distribution	352	77,360,328	90.0	%	95.4	%	$	314,988	89.0	%
Light Manufacturing	66	7,117,929	8.3	%	97.9	%	33,429		9.4	%
Total Operating Portfolio/weighted average	418	84,478,257	98.3	%	95.6	%	$	348,417	98.4	%
Value Add	4	1,082,795	1.2	%	44.5	%	2,637		0.7	%
Flex/Office	8	432,315	0.5	%	58.1	%	3,207		0.9	%
Total portfolio/weighted average	430	85,993,367	100.0	%	94.8	%	$	354,261	100.0	%

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Portfolio Acquisitions

The following table summarizes our acquisitions during the three and nine months ended September 30, 2019.

Market (1)	Date Acquired	Square Feet	Buildings	Purchase Price (in thousands)
Cincinnati/Dayton, OH	January 24, 2019	176,000	1	$	9,965
Pittsburgh, PA	February 21, 2019	455,000	1	28,676
Boston, MA	February 21, 2019	349,870	1	26,483
Minneapolis/St Paul, MN	February 28, 2019	248,816	1	21,955
Greenville/Spartanburg, SC	March 7, 2019	331,845	1	24,536
Philadelphia, PA	March 7, 2019	148,300	1	10,546
Omaha/Council Bluffs, NE-IA	March 11, 2019	237,632	1	20,005
Houston, TX	March 28, 2019	132,000	1	17,307
Baltimore, MD	March 28, 2019	167,410	1	13,648
Houston, TX	March 28, 2019	116,750	1	12,242
Three months ended March 31, 2019		2,363,623	10	185,363
Minneapolis/St Paul, MN	April 2, 2019	100,600	1	9,045
West Michigan, MI	April 8, 2019	230,200	1	15,786
Greensboro/Winston-Salem, NC	April 12, 2019	129,600	1	7,771
Greenville/Spartanburg, SC	April 25, 2019	319,660	2	15,432
Charleston/N Charleston, SC	April 29, 2019	500,355	1	40,522
Houston, TX	April 29, 2019	128,136	1	13,649
Richmond, VA	May 16, 2019	109,520	1	9,467
Laredo, TX	June 6, 2019	213,982	1	18,972
Baton Rouge, LA	June 18, 2019	252,800	2	20,041
Philadelphia, PA	June 19, 2019	187,569	2	13,645
Columbus, OH	June 28, 2019	857,390	1	95,828
Three months ended June 30, 2019		3,029,812	14	260,158
Kansas City, MO	July 10, 2019	304,840	1	13,450
Houston, TX	July 22, 2019	199,903	1	11,287
Charleston/N Charleston, SC	July 22, 2019	88,583	1	7,166
Tampa, FL	August 5, 2019	78,560	1	8,168
Philadelphia, PA	August 6, 2019	120,000	1	10,880
Milwaukee/Madison, WI	August 16, 2019	224,940	3	13,981
Houston, TX	August 19, 2019	45,000	1	6,190
West Michigan, MI	August 19, 2019	210,120	1	10,407
Pittsburgh, PA	August 21, 2019	410,389	1	31,219
Boston, MA	August 22, 2019	80,100	1	14,253
Las Vegas, NV	August 27, 2019	80,422	2	12,602
Nashville, TN	August 29, 2019	348,880	1	20,267
Columbia, SC	August 30, 2019	200,000	1	13,670
Pittsburgh, PA	September 6, 2019	138,270	1	9,323
Omaha/Council Bluffs, NE-IA	September 11, 2019	128,200	2	8,509
Pittsburgh, PA	September 16, 2019	315,634	1	28,712
Memphis, TN	September 19, 2019	1,135,453	1	50,941
Memphis, TN	September 26, 2019	629,086	1	31,542
Three months ended September 30, 2019		4,738,380	22	302,567
Nine months ended September 30, 2019		10,131,815	46	$	748,088

(1) As defined by CoStar Realty Information Inc (“CoStar”). If the building is located outside of a CoStar defined market, the city and state is reflected.

Portfolio Dispositions

During the nine months ended September 30, 2019, we sold six buildings and two land parcels comprised of approximately 1.1 million rentable square feet with a net book value of approximately $20.4 million to third parties. Net proceeds from the sales of rental property were approximately $23.7 million and we recognized the full gain on the sales of rental property, net, of approximately $3.3 million for the nine months ended September 30, 2019.

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Geographic Diversification

The following table summarizes information about the 20 largest markets in our portfolio based on total annualized base rental revenue as of September 30, 2019.

Top 20 Markets (1)	% of Total Annualized Base Rental Revenue
Philadelphia, PA	9.0	%
Chicago, IL	7.3	%
Greenville/Spartanburg, SC	5.7	%
Pittsburgh, PA	4.8	%
Milwaukee/Madison, WI	4.1	%
Detroit, MI	3.9	%
Minneapolis/St Paul, MN	3.3	%
Houston, TX	3.2	%
Charlotte, NC	2.9	%
Cincinnati/Dayton, OH	2.7	%
Boston, MA	2.7	%
West Michigan, MI	2.6	%
Columbus, OH	2.5	%
El Paso, TX	2.4	%
Westchester/So Connecticut, CT/NY	1.9	%
Raleigh/Durham, NC	1.7	%
Cleveland, OH	1.7	%
Memphis, TN	1.6	%
Baltimore, MD	1.5	%
Dallas/Ft Worth, TX	1.4	%
Total	66.9	%

(1) As defined by CoStar.

Industry Diversification

The following table summarizes information about the 20 largest tenant industries in our portfolio based on total annualized base rental revenue as of September 30, 2019.

Top 20 Tenant Industries (1)	% of Total Annualized Base Rental Revenue
Auto Components	11.9	%
Air Freight & Logistics	8.6	%
Commercial Services & Supplies	7.5	%
Containers & Packaging	6.2	%
Machinery	5.1	%
Household Durables	5.0	%
Building Products	4.8	%
Food Products	4.5	%
Food & Staples Retailing	3.6	%
Electrical Equipment	3.5	%
Household Products	3.4	%
Beverages	3.1	%
Internet & Direct Mkt Retail	3.0	%
Textiles, Apparel, Luxury Good	2.0	%
Media	1.9	%
Metals & Mining	1.9	%
Electronic Equip, Instruments	1.8	%
Specialty Retail	1.8	%
Chemicals	1.7	%
Pharmaceuticals	1.7	%
Total	83.0	%

(1) Industry classification based on Global Industry Classification Standard methodology.

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Tenant Diversification

The following table summarizes information about the 20 largest tenants in our portfolio based on total annualized base rental revenue as of September 30, 2019.

Top 20 Tenants (1)	Number of Leases	% of Total Annualized Base Rental Revenue
General Service Administration	1	2.0	%
Amazon	2	1.6	%
XPO Logistics, Inc.	4	1.3	%
DHL Supply Chain	5	1.1	%
Yanfeng US Automotive Interior	3	1.1	%
Solo Cup	1	1.1	%
TriMas Corporation	4	1.1	%
Ford Motor Company	1	0.9	%
FedEx Corporation	3	0.9	%
WestRock Company	6	0.8	%
Kenco Logistic Services, LLC	2	0.8	%
Generation Brands	1	0.8	%
Carolina Beverage Group	2	0.8	%
Perrigo Company	2	0.8	%
Emerson Electric	2	0.7	%
Quoizel, Inc.	1	0.7	%
Schneider Electric USA, Inc.	3	0.7	%
American Tire Distributors Inc	4	0.7	%
Coca-Cola Refreshments USA Inc	2	0.6	%
Medline Industries, Inc.	1	0.6	%
Total	50	19.1	%

(1) Includes tenants, guarantors, and/or non-guarantor parents.

Critical Accounting Policies

See “Critical Accounting Policies” in “Management’s Discussion and Analysis of Financial Condition and Results of Operations” in our Annual Report on Form 10-K for the year ended December 31, 2018, for a discussion of our critical accounting policies and estimates.

On January 1, 2019, we adopted Accounting Standards Update 2016-02, Leases (Topic 842); see Note 2 in the accompanying Notes to Consolidated Financial Statements under “New Accounting Standards and Reclassifications.”

Results of Operations

The following discussion of our results of our same store (as defined below) net operating income (“NOI”) should be read in conjunction with our Consolidated Financial Statements. For a detailed discussion of NOI, including the reasons management believes NOI is useful to investors, see “Non-GAAP Financial Measures” below. Same store results are considered to be useful to investors in evaluating our performance because they provide information relating to changes in building-level operating performance without taking into account the effects of acquisitions or dispositions. We encourage the reader to not only look at our same store results, but also our total portfolio results, due to historic and future growth.

We define same store properties as properties that were in the Operating Portfolio for the entirety of the comparative periods presented. Same store properties exclude Operating Portfolio properties with expansions placed into service after December 31, 2017. On September 30, 2019, we owned 317 industrial buildings consisting of approximately 63.2 million square feet, which represents approximately 73.5% of our total portfolio, that are considered our same store portfolio in the analysis below. Same store occupancy decreased approximately 1.9% to 94.6% as of September 30, 2019 compared to 96.5% as of September 30, 2018.

Comparison of the three months ended September 30, 2019 to the three months ended September 30, 2018

The following table summarizes selected operating information for our same store portfolio and our total portfolio for the three months ended September 30, 2019 and 2018 (dollars in thousands). This table includes a reconciliation from our same store portfolio to our total portfolio by also providing information for the three months ended September 30, 2019 and 2018 with

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respect to the buildings acquired and disposed of and Operating Portfolio buildings with expansions placed into service or transferred from the Value Add Portfolio to the Operating Portfolio after December 31, 2017 and our flex/office buildings and Value Add Portfolio.

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	Same Store Portfolio								Acquisitions/Dispositions				Other				Total Portfolio
	Three months ended September 30,				Change				Three months ended September 30,				Three months ended September 30,				Three months ended September 30,				Change
	2019		2018		$		%		2019		2018		2019		2018		2019		2018		$		%
Revenue
Operating revenue
Rental income	$	75,376	$	75,002	$	374	0.5	%	$	23,611	$	10,922	$	3,307	$	2,753	$	102,294	$	88,677	$	13,617	15.4	%
Other income	55		255		(200)		(78.4)	%	72		14		—		—		127		269		(142)		(52.8)	%
Total operating revenue	75,431		75,257		174		0.2	%	23,683		10,936		3,307		2,753		102,421		88,946		13,475		15.1	%
Expenses
Property	13,796		13,713		83		0.6	%	3,078		2,235		1,283		1,164		18,157		17,112		1,045		6.1	%
Net operating income (1)	$	61,635	$	61,544	$	91	0.1	%	$	20,605	$	8,701	$	2,024	$	1,589	84,264		71,834		12,430		17.3	%
Other expenses
General and administrative																	8,924		8,911		13		0.1	%
Depreciation and amortization																	46,908		44,355		2,553		5.8	%
Loss on impairments																	4,413		—		4,413		100.0	%
Other expenses																	458		223		235		105.4	%
Total other expenses																	60,703		53,489		7,214		13.5	%
Total expenses																	78,860		70,601		8,259		11.7	%
Other income (expense)
Interest and other income																	12		3		9		300.0	%
Interest expense																	(14,053)		(12,698)		(1,355)		10.7	%
Loss on extinguishment of debt																	—		(13)		13		(100.0)	%
Gain on the sales of rental property, net																	1,670		3,239		(1,569)		(48.4)	%
Total other income (expense)																	(12,371)		(9,469)		(2,902)		30.6	%
Net income																	$	11,190	$	8,876	$	2,314	26.1	%

(1)For a detailed discussion of NOI, including the reasons management believes NOI is useful to investors, see “Non-GAAP Financial Measures” below.

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Net Income

Net income for our total portfolio increased by $2.3 million or 26.1% to $11.2 million for the three months ended September 30, 2019, compared to $8.9 million for the three months ended September 30, 2018.

Same Store Total Operating Revenue

Same store total operating revenue consists primarily of rental income consisting of (i) fixed lease payments, variable lease payments, straight-line rental income, and above and below market lease amortization from our properties (“lease income”), and (ii) other tenant billings for insurance, real estate taxes and certain other expenses (“other billings”).

For a detailed reconciliation of our same store total operating revenue to net income, see the table above.

Same store rental income, which is comprised of lease income and other billings as discussed below, increased by $0.4 million or 0.5% to $75.4 million for the three months ended September 30, 2019 compared to $75.0 million for the three months ended September 30, 2018.

Same store lease income increased by $0.2 million or 0.4% to $64.0 million for the three months ended September 30, 2019 compared to $63.8 million for the three months ended September 30, 2018. Approximately $1.7 million of the increase was attributable to rental increases due to new leases and renewals of existing tenants. This increase was partially offset by an approximately $1.5 million decrease due to a reduction of base rent due to tenants downsizing their spaces and vacancies.

Same store other billings increased by $0.2 million or 1.1% to $11.4 million for the three months ended September 30, 2019 compared to $11.2 million for the three months ended September 30, 2018. The increase was primarily attributable to an increase in real estate taxes levied by the taxing authority and changes to lease terms where we began paying the real estate taxes and operating expenses on behalf of tenants that had previously paid its taxes and operating expenses directly to respective vendors of approximately $0.4 million. This increase was partially offset by a decrease of approximately $0.2 million related to tenant specific billings that occurred during the three months ended September 30, 2019 that did not recur during the three months ended September 30, 2018.

Same store other income decreased by $0.2 million or 78.4% to $0.1 million for the three months ended September 30, 2019 compared to $0.3 million for the three months ended September 30, 2018. This decrease is primarily the result of income received in 2018 for settlements or other sums received from former tenants which did not recur in 2019.

Same Store Operating Expenses

Same store operating expenses consist primarily of property operating expenses and real estate taxes and insurance.

For a detailed reconciliation of our same store operating expenses to net income, see the table above.

Total same store property operating expenses increased by $0.1 million or 0.6% to $13.8 million for the three months ended September 30, 2019 compared to $13.7 million for the three months ended September 30, 2018. This increase was primarily related to increases in real estate taxes levied by the related taxing authority and changes to lease terms where we began paying the real estate taxes on behalf of tenants that had previously paid its taxes directly to the taxing authority of approximately $0.2 million and an increase in repairs and maintenance expense of approximately $0.3 million. These increases were partially offset by decreases in insurance expense of approximately $0.3 million and utility expense of approximately $0.1 million.

Acquisitions and Dispositions Net Operating Income

For a detailed reconciliation of our acquisitions and dispositions NOI to net income, see the table above.

Subsequent to December 31, 2017, we acquired 95 buildings consisting of approximately 19.6 million square feet (excluding four buildings that were included in the Value Add Portfolio at September 30, 2019 or transferred from the Value Add Portfolio to the Operating Portfolio after December 31, 2017), and sold 25 buildings and two land parcels consisting of approximately 5.0 million square feet. For the three months ended September 30, 2019 and 2018, the buildings acquired after December 31, 2017 contributed approximately $20.7 million and $5.9 million to NOI, respectively. For the three months ended September 30, 2019 and 2018, the buildings sold after December 31, 2017 contributed approximately $(0.1) and $2.8 million to NOI, respectively.

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Refer to Note 3 in the accompanying Notes to Consolidated Financial Statements for additional discussion regarding buildings acquired or sold.

Other Net Operating Income

Our other assets include our flex/office buildings, Value Add Portfolio, and Operating Portfolio buildings with expansions placed in service or transferred from the Value Add Portfolio to the Operating Portfolio after December 31, 2017. Other NOI also includes termination adjustments from buildings in our same store portfolio.

For a detailed reconciliation of our other NOI to net income, see the table above.

At September 30, 2019, we owned eight flex/office buildings consisting of approximately 0.4 million square feet, four buildings in our Value Add Portfolio consisting of approximately 1.1 million square feet, and six buildings consisting of approximately 1.7 million square feet that were Operating Portfolio buildings with expansions placed in service or transferred from the Value Add Portfolio to the Operating Portfolio after December 31, 2017. These buildings contributed approximately $2.0 million and $1.9 million to NOI for the three months ended September 30, 2019 and 2018, respectively. Additionally, there was approximately $(16,000) and $(0.3) million of termination adjustments from certain buildings in our same store portfolio for the three months ended September 30, 2019 and 2018, respectively.

Total Other Expenses

Total other expenses consist of general and administrative expenses, depreciation and amortization, loss on impairments, and other expenses.

Total other expenses increased $7.2 million or 13.5% for the three months ended September 30, 2019 to $60.7 million compared to $53.5 million for the three months ended September 30, 2018. This is primarily a result of an increase in loss on impairments of approximately $4.4 million related to the property in Belfast, ME that is in our flex/office building portfolio, as well as an increase in depreciation and amortization of approximately $2.6 million due to an increase in the depreciable asset base as a result of net acquisitions.

Total Other Income (Expense)

Total other income (expense) consists of interest and other income, interest expense, loss on extinguishment of debt, and gain on the sales of rental property, net. Interest expense includes interest incurred during the period as well as adjustments related to amortization of financing fees and debt issuance costs, and amortization of fair market value adjustments associated with the assumption of debt.

Total other expense increased $2.9 million or 30.6% for the three months ended September 30, 2019 to $12.4 million compared $9.5 million for the three months ended September 30, 2018. This increase is primarily the result of a decrease in the gain on the sales of rental property, net of approximately $1.6 million. This increase is also attributable to an increase in interest expense of approximately $1.4 million which was primarily attributable to the funding of an unsecured term loans on July 27, 2018 and July 25, 2019 and a higher average unsecured credit facility balance during the three months ended September 30, 2019 as compared the three months ended September 30, 2018.

Comparison of the nine months ended September 30, 2019 to the nine months ended September 30, 2018

The following table summarizes selected operating information for our same store portfolio and our total portfolio for the nine months ended September 30, 2019 and 2018 (dollars in thousands). This table includes a reconciliation from our same store portfolio to our total portfolio by also providing information for the nine months ended September 30, 2019 and 2018 with respect to the buildings acquired and disposed of and Operating Portfolio buildings with expansions placed into service or transferred from the Value Add Portfolio to the Operating Portfolio after December 31, 2017 and our flex/office buildings and Value Add Portfolio.

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	Same Store Portfolio								Acquisitions/Dispositions				Other				Total Portfolio
	Nine months ended September 30,				Change				Nine months ended September 30,				Nine months ended September 30,				Nine months ended September 30,				Change
	2019		2018		$		%		2019		2018		2019		2018		2019		2018		$		%
Revenue
Operating revenue
Rental income	$	226,878	$	222,636	$	4,242	1.9	%	$	57,960	$	25,327	$	9,433	$	8,707	$	294,271	$	256,670	$	37,601	14.6	%
Other income	394		787		(393)		(49.9)	%	104		243		—		3		498		1,033		(535)		(51.8)	%
Total operating revenue	227,272		223,423		3,849		1.7	%	58,064		25,570		9,433		8,710		294,769		257,703		37,066		14.4	%
Expenses
Property	42,585		40,326		2,259		5.6	%	8,080		6,752		3,958		3,657		54,623		50,735		3,888		7.7	%
Net operating income (1)	$	184,687	$	183,097	$	1,590	0.9	%	$	49,984	$	18,818	$	5,475	$	5,053	240,146		206,968		33,178		16.0	%
Other expenses
General and administrative																	26,723		25,637		1,086		4.2	%
Depreciation and amortization																	133,844		125,221		8,623		6.9	%
Loss on impairments																	9,757		2,934		6,823		232.5	%
Other expenses																	1,284		864		420		48.6	%
Total other expenses																	171,608		154,656		16,952		11.0	%
Total expenses																	226,231		205,391		20,840		10.1	%
Other income (expense)
Interest and other income																	30		16		14		87.5	%
Interest expense																	(39,080)		(35,602)		(3,478)		9.8	%
Loss on extinguishment of debt																	—		(13)		13		(100.0)	%
Gain on the sales of rental property, net																	3,261		32,276		(29,015)		(89.9)	%
Total other income (expense)																	(35,789)		(3,323)		(32,466)		977.0	%
Net income																	$	32,749	$	48,989	$	(16,240)	(33.2)	%

(1)For a detailed discussion of NOI, including the reasons management believes NOI is useful to investors, see “Non-GAAP Financial Measures” below.

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Net Income

Net income for our total portfolio decreased by $16.2 million or 33.2% to $32.7 million for the nine months ended September 30, 2019 compared to $49.0 million for the nine months ended September 30, 2018.

Same Store Total Operating Revenue

Same store total operating revenue consists primarily of rental income consisting of (i) fixed lease payments, variable lease payments, straight-line rental income, and above and below market lease amortization from our properties (“lease income”), and (ii) other tenant billings for insurance, real estate taxes and certain other expenses (“other billings”).

For a detailed reconciliation of our same store total operating revenue to net income, see the table above.

Same store rental income, which is comprised of lease income and other billings as discussed below, increased by $4.2 million or 1.9% to $226.9 million for the nine months ended September 30, 2019 compared to $222.6 million for the nine months ended September 30, 2018.

Same store lease income increased by $2.0 million or 1.1% to $191.3 million for the nine months ended September 30, 2019 compared to $189.3 million for the nine months ended September 30, 2018. Approximately $5.8 million of the increase was attributable to rental increases due to new leases and renewals of existing tenants and approximately $0.3 million due to a net decrease in the amortization of net above market leases. This increase was partially offset by an approximately $4.1 million decrease due to a reduction of base rent due to tenants downsizing their spaces and vacancies.

Same store other billings increased by $2.2 million or 6.6% to $35.5 million for the nine months ended September 30, 2019 compared to $33.3 million for the nine months ended September 30, 2018. The increase was primarily attributable to an increase in real estate taxes levied by the taxing authority and changes to lease terms where we began paying the real estate taxes and operating expenses on behalf of tenants that had previously paid its taxes and operating expenses directly to respective vendors of approximately $2.4 million. This increase was partially offset by a decrease of approximately $0.2 million related to tenant specific billings that occurred during the nine months ended September 30, 2019 that did not recur during the nine months ended September 30, 2018.

Same store other income decreased by $0.4 million or 49.9% to $0.4 million for the nine months ended September 30, 2019 compared to $0.8 million for the nine months ended September 30, 2018. This decrease is primarily the result of income received in 2018 for settlements or other sums received from former tenants which did not recur in 2019.

Same Store Operating Expenses

Same store operating expenses consist primarily of property operating expenses and real estate taxes and insurance.

For a detailed reconciliation of our same store operating expenses to net income, see the table above.

Total same store operating expenses increased by $2.3 million or 5.6% to $42.6 million for the nine months ended September 30, 2019 compared to $40.3 million for the nine months ended September 30, 2018. This increase was primarily related to increases in real estate taxes levied by the related taxing authority and changes to lease terms where we began paying the real estate taxes on behalf of tenants that had previously paid its taxes directly to the taxing authority of approximately $2.8 million, an increase in snow removal and other expenses of approximately $0.5 million, and an increase in repairs and maintenance expense of approximately $0.4 million. These increases were partially offset by a decrease in insurance and utility expenses of approximately $1.4 million.

Acquisitions and Dispositions Net Operating Income

For a detailed reconciliation of our acquisitions and dispositions NOI to net income, see the table above.

Subsequent to December 31, 2017, we acquired 95 buildings consisting of approximately 19.6 million square feet (excluding four buildings that were included in the Value Add Portfolio at September 30, 2019 or transferred from the Value Add Portfolio to the Operating Portfolio after December 31, 2017), and sold 25 buildings and two land parcels consisting of approximately 5.0 million square feet. For the nine months ended September 30, 2019 and September 30, 2018, the buildings acquired after December 31, 2017 contributed approximately $49.9 million and $9.0 million to NOI, respectively. For the nine months ended

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September 30, 2019 and September 30, 2018, the buildings sold after December 31, 2017 contributed approximately $0.1 million and $9.8 million to NOI, respectively. Refer to Note 3 in the accompanying Notes to Consolidated Financial Statements for additional discussion regarding buildings acquired or sold.

Other Net Operating Income

Our other assets include our flex/office buildings, Value Add Portfolio, and Operating Portfolio buildings with expansions placed in service or transferred from the Value Add Portfolio to the Operating Portfolio after December 31, 2017. Other NOI also includes termination adjustments from buildings in our same store portfolio.

For a detailed reconciliation of our other NOI to net income, see the table above.

At September 30, 2019, we owned eight flex/office buildings consisting of approximately 0.4 million square feet, four buildings in our Value Add Portfolio consisting of approximately 1.1 million square feet, and six buildings consisting of approximately 1.7 million square feet that were Operating Portfolio buildings with expansions placed in service or transferred from the Value Add Portfolio to the Operating Portfolio after December 31, 2017. These buildings contributed approximately $5.7 million and $5.4 million to NOI for the nine months ended September 30, 2019 and September 30, 2018, respectively. Additionally, there was $(0.2) million and $(0.3) million of termination adjustments from certain buildings in our same store portfolio for the nine months ended September 30, 2019 and September 30, 2018, respectively.

Total Other Expenses

Total other expenses consist of general and administrative expenses, depreciation and amortization, loss on impairments, and other expenses.

Total other expenses increased $17.0 million or 11.0% to $171.6 million for the nine months ended September 30, 2019 compared to $154.7 million for the nine months ended September 30, 2018. This is primarily a result of an increase in depreciation and amortization of approximately $8.6 million as a result of net acquisitions that increased the depreciable asset base, as well as an increase of approximately $6.8 million in loss on impairments. General and administrative expenses increased by approximately $1.1 million primarily due to increases in compensation and other payroll costs.

Total Other Income (Expense)

Total other income (expense) consists of interest and other income, interest expense, loss on extinguishment of debt, and gain on the sales of rental property, net. Interest expense includes interest incurred during the period as well as adjustments related to amortization of financing fees and debt issuance costs, and amortization of fair market value adjustments associated with the assumption of debt.

Total other expense increased $32.5 million or 977.0% to $35.8 million for the nine months ended September 30, 2019 compared to $3.3 million for the nine months ended September 30, 2018. This increase is primarily the result of a decrease in the gain on the sales of rental property, net of approximately $29.0 million. This increase is also attributable to an increase in interest expense of approximately $3.5 million which was primarily attributable to the funding of unsecured term loans on March 28, 2018, July 27, 2018, and July 25, 2019, and the funding of unsecured notes on June 13, 2018 during the nine months ended September 30, 2019 as compared the nine months ended September 30, 2018.

Non-GAAP Financial Measures

In this report, we disclose funds from operations (“FFO”) and NOI, which meet the definition of “non-GAAP financial measures” as set forth in Item 10(e) of Regulation S-K promulgated by the Securities and Exchange Commission (“SEC”). As a result, we are required to include in this report a statement of why management believes that presentation of these measures provides useful information to investors.

Funds From Operations

FFO should not be considered as an alternative to net income (determined in accordance with GAAP) as an indication of our performance, and we believe that to understand our performance further, FFO should be compared with our reported net income (loss) in accordance with GAAP, as presented in our consolidated financial statements included in this report.

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We calculate FFO in accordance with the standards established by the National Association of Real Estate Investment Trusts (“NAREIT”). FFO represents GAAP net income (loss), excluding gains (or losses) from sales of depreciable operating buildings, land sales, impairment write-downs of depreciable real estate, real estate related depreciation and amortization (excluding amortization of deferred financing costs and fair market value of debt adjustment) and after adjustments for unconsolidated partnerships and joint ventures.

Management uses FFO as a supplemental performance measure because it is a widely recognized measure of the performance of REITs. FFO may be used by investors as a basis to compare our operating performance with that of other REITs.

However, because FFO excludes depreciation and amortization and captures neither the changes in the value of our buildings that result from use or market conditions nor the level of capital expenditures and leasing commissions necessary to maintain the operating performance of our buildings, all of which have real economic effects and could materially impact our results from operations, the utility of FFO as a measure of our performance is limited. In addition, other REITs may not calculate FFO in accordance with the NAREIT definition, and, accordingly, our FFO may not be comparable to such other REITs’ FFO. FFO should not be used as a measure of our liquidity, and is not indicative of funds available for our cash needs, including our ability to pay dividends.

The following table sets forth a reconciliation of our FFO attributable to common stockholders and unit holders for the periods presented to net income, the nearest GAAP equivalent.

	Three months ended September 30,				Nine months ended September 30,
Reconciliation of Net Income to FFO (in thousands)	2019		2018		2019		2018
Net income	$	11,190	$	8,876	$	32,749	$	48,989
Rental property depreciation and amortization	46,834		44,281		133,622		124,999
Loss on impairments	4,413		—		9,757		2,934
Gain on the sales of rental property, net	(1,670)		(3,239)		(3,261)		(32,276)
FFO	60,767		49,918		172,867		144,646
Preferred stock dividends	(1,289)		(1,289)		(3,867)		(6,315)
Redemption of preferred stock	—		—		—		(2,661)
Amount allocated to restricted shares of common stock and unvested units	(218)		(172)		(697)		(587)
FFO attributable to common stockholders and unit holders	$	59,260	$	48,457	$	168,303	$	135,083

Net Operating Income

We consider NOI to be an appropriate supplemental performance measure to net income (loss) because we believe it helps investors and management understand the core operations of our buildings. NOI is defined as rental income, which includes billings for common area maintenance, real estate taxes and insurance, less property expenses and real estate taxes and insurance. NOI should not be viewed as an alternative measure of our financial performance since it excludes expenses which could materially impact our results of operations. Further, our NOI may not be comparable to that of other real estate companies, as they may use different methodologies for calculating NOI.

The following table sets forth a reconciliation of our NOI for the periods presented to net income, the nearest GAAP equivalent.

	Three months ended September 30,				Nine months ended September 30,
Reconciliation of Net Income to NOI (in thousands)	2019		2018		2019		2018
Net income	$	11,190	$	8,876	$	32,749	$	48,989
General and administrative	8,924		8,911		26,723		25,637
Transaction costs	94		94		247		170
Depreciation and amortization	46,908		44,355		133,844		125,221
Interest and other income	(12)		(3)		(30)		(16)
Interest expense	14,053		12,698		39,080		35,602
Loss on impairments	4,413		—		9,757		2,934
Loss on extinguishment of debt	—		13		—		13
Other expenses	364		129		1,037		694
Gain on the sales of rental property, net	(1,670)		(3,239)		(3,261)		(32,276)
Net operating income	$	84,264	$	71,834	$	240,146	$	206,968

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Cash Flows

Comparison of the nine months ended September 30, 2019 to the nine months ended September 30, 2018

The following table summarizes our cash flows for the nine months ended September 30, 2019 compared to the nine months ended September 30, 2018.

	Nine months ended September 30,				Change
Cash Flows (dollars in thousands)	2019		2018		$		%
Net cash provided by operating activities	$	174,930	$	148,610	$	26,320	17.7	%
Net cash used in investing activities	$	765,675	$	393,250	$	372,425	94.7	%
Net cash provided by financing activities	$	577,476	$	227,766	$	349,710	153.5	%

Net cash provided by operating activities increased $26.3 million to $174.9 million for the nine months ended September 30, 2019 compared to $148.6 million for the nine months ended September 30, 2018. The increase was primarily attributable to incremental operating cash flows from property acquisitions completed after September 30, 2018, and operating performance at existing properties. These increases were partially offset by the loss of cash flows from property dispositions completed after September 30, 2018 and fluctuations in working capital due to timing of payments and rental receipts.

Net cash used in investing activities increased $372.4 million to $765.7 million for the nine months ended September 30, 2019 compared to $393.3 million for the nine months ended September 30, 2018. The increased cash outflow was primarily due to the acquisition of 46 buildings for a total cash consideration of approximately $748.0 million for the nine months ended September 30, 2019 compared to the acquisition of 36 buildings for a total cash consideration of approximately $458.4 million for the nine months ended September 30, 2018. The increase is also attributable to a decrease in net proceeds from the sales of rental property, net related to the disposition of six buildings and two land parcels during the nine months ended September 30, 2019 for net proceeds of approximately $23.7 million, compared to the nine months ended September 30, 2018 where we sold 11 buildings for net proceeds of approximately $89.4 million.

Net cash provided by financing activities increased $349.7 million to $577.5 million for the nine months ended September 30, 2019 compared to $227.8 million for the nine months ended September 30, 2018. The increase is primarily attributable to an increase of net proceeds from the sales of common stock of approximately $295.1 million and a decrease of net cash outflow on our unsecured credit facility of approximately $153.5 million during the nine months ended September 30, 2019 compared to the nine months ended September 30, 2018. Additionally, the increase is also attributable to a decrease in cash used for the redemption of preferred stock of $70.0 million during the nine months ended September 30, 2018 which did not recur during the nine months ended September 30, 2019, and an increase of proceeds from unsecured term loans of approximately $25.0 million during the nine months ended September 30, 2019 compared to the nine months ended September 30, 2018. These increases were partially offset by a decrease in proceeds from unsecured term notes of $175.0 million and an approximately $22.2 million increase in dividends paid during the nine months ended September 30, 2019 compared to the nine months ended September 30, 2018.

Liquidity and Capital Resources

We believe that our liquidity needs will be satisfied through cash flows generated by operations, disposition proceeds, and financing activities. Operating cash flow is primarily rental income, expense recoveries from tenants, and other income from operations and is our principal source of funds that we use to pay operating expenses, debt service, recurring capital expenditures and the distributions required to maintain our REIT qualification. We look to the capital markets (common equity, preferred equity, and debt) to primarily fund our acquisition activity. We seek to increase cash flows from our properties by maintaining quality standards for our buildings that promote high occupancy rates and permit increases in rental rates while reducing tenant turnover and controlling operating expenses. We believe that our revenue, together with proceeds from building sales and debt and equity financings, will continue to provide funds for our short-term and medium-term liquidity needs.

Our short-term liquidity requirements consist primarily of funds to pay for operating expenses and other expenditures directly associated with our buildings, including interest expense, interest rate swap payments, scheduled principal payments on outstanding indebtedness, funding of property acquisitions under contract, general and administrative expenses, and capital expenditures for tenant improvements and leasing commissions.

Our long-term liquidity needs, in addition to recurring short-term liquidity needs as discussed above, consist primarily of funds necessary to pay for acquisitions, non-recurring capital expenditures, and scheduled debt maturities. We intend to satisfy our

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long-term liquidity needs through cash flow from operations, the issuance of equity or debt securities, other borrowings, property dispositions, or, in connection with acquisitions of certain additional buildings, the issuance of common units in the Operating Partnership.

As of September 30, 2019, we had total immediate liquidity of approximately $622.5 million, comprised of $6.5 million of cash and cash equivalents and $616.0 million of immediate availability on our unsecured credit facility and unsecured term loans.

In addition, we require funds for future dividends to be paid to our common and preferred stockholders and unit holders in the Operating Partnership. These distributions on our common stock are voluntary (at the discretion of our board of directors), to the extent we have satisfied distribution requirements in order to maintain our REIT status for federal income tax purposes, and may be reduced or stopped if needed to fund other liquidity requirements or for other reasons. The following table summarizes the dividends attributable to our outstanding common stock that had a record date during the nine months ended September 30, 2019.

Month Ended 2019	Declaration Date	Record Date	Per Share		Payment Date
September 30	July 15, 2019	September 30, 2019	$	0.119167	October 15, 2019
August 31	July 15, 2019	August 30, 2019	0.119167		September 16, 2019
July 31	July 15, 2019	July 31, 2019	0.119167		August 15, 2019
June 30	April 9, 2019	June 28, 2019	0.119167		July 15, 2019
May 31	April 9, 2019	May 31, 2019	0.119167		June 17, 2019
April 30	April 9, 2019	April 30, 2019	0.119167		May 15, 2019
March 31	January 10, 2019	March 29, 2019	0.119167		April 15, 2019
February 28	January 10, 2019	February 28, 2019	0.119167		March 15, 2019
January 31	January 10, 2019	January 31, 2019	0.119167		February 15, 2019
Total			$	1.072503

On October 15, 2019, our board of directors declared the common stock dividends for the months ending October 31, 2019, November 30, 2019, and December 31, 2019 at a monthly rate of $0.119167 per share of common stock.

During the nine months ended September 30, 2019, we declared quarterly cumulative dividends on the 6.875% Series C Cumulative Redeemable Preferred Stock (“Series C Preferred Stock”) at a rate equivalent to the fixed annual rate of $1.71875 per share. The following table summarizes the dividends on the Series C Preferred Stock during the nine months ended September 30, 2019.

Quarter Ended 2019	Declaration Date	Series C Preferred Stock Per Share		Payment Date
September 30	July 15, 2019	$	0.4296875	September 30, 2019
June 30	April 9, 2019	0.4296875		July 1, 2019
March 31	January 10, 2019	0.4296875		April 1, 2019
Total		$	1.2890625

On October 15, 2019, our board of directors declared the Series C Preferred Stock dividends for the quarter ending December 31, 2019 at a quarterly rate of $0.4296875 per share.

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Indebtedness Outstanding

The following table summarizes certain information with respect to our indebtedness outstanding as of September 30, 2019

Loan	Principal Outstanding as of September 30, 2019 (in thousands)		Interest  Rate (1)(2)		Maturity Date	Prepayment Terms (3)
Unsecured credit facility:
Unsecured Credit Facility (4)	$	78,000	L + 0.90%		January 15, 2023	i
Total unsecured credit facility	78,000
Unsecured term loans:
Unsecured Term Loan C	150,000		2.39	%	September 29, 2020	i
Unsecured Term Loan B	150,000		3.05	%	March 21, 2021	i
Unsecured Term Loan A	150,000		2.70	%	March 31, 2022	i
Unsecured Term Loan D	150,000		2.85	%	January 4, 2023	i
Unsecured Term Loan E	175,000		3.92	%	January 15, 2024	i
Unsecured Term Loan F (5)	—		3.11	%	January 12, 2025	i
Total unsecured term loans	775,000
Less: Total unamortized deferred financing fees and debt issuance costs	(3,963)
Total carrying value unsecured term loans, net	771,037
Unsecured notes:
Series F Unsecured Notes	100,000		3.98	%	January 5, 2023	ii
Series A Unsecured Notes	50,000		4.98	%	October 1, 2024	ii
Series D Unsecured Notes	100,000		4.32	%	February 20, 2025	ii
Series G Unsecured Notes	75,000		4.10	%	June 13, 2025	ii
Series B Unsecured Notes	50,000		4.98	%	July 1, 2026	ii
Series C Unsecured Notes	80,000		4.42	%	December 30, 2026	ii
Series E Unsecured Notes	20,000		4.42	%	February 20, 2027	ii
Series H Unsecured Notes	100,000		4.27	%	June 13, 2028	ii
Total unsecured notes	575,000
Less: Total unamortized deferred financing fees and debt issuance costs	(2,217)
Total carrying value unsecured notes, net	572,783
Mortgage notes (secured debt):
Wells Fargo Bank, National Association CMBS Loan	51,861		4.31	%	December 1, 2022	iii
Thrivent Financial for Lutherans	3,709		4.78	%	December 15, 2023	iv
Total mortgage notes	55,570
Add: Total unamortized fair market value premiums	42
Less: Total unamortized deferred financing fees and debt issuance costs	(402)
Total carrying value mortgage notes, net	55,210
Total / weighted average interest rate (6)	$	1,477,030	3.58	%

(1)Interest rate as of September 30, 2019. At September 30, 2019, the one-month LIBOR (“L”) was 2.01563%. The current interest rate is not adjusted to include the amortization of deferred financing fees or debt issuance costs incurred in obtaining debt or any unamortized fair market value premiums. The spread over the applicable rate for our unsecured credit facility and unsecured term loans is based on the our debt rating, as defined in the respective loan agreements.

(2)As of September 30, 2019, one-month LIBOR for the Unsecured Term Loans A, B, C, D, E, and F was swapped to a fixed rate of 1.70%, 2.05%, 1.39%, 1.85%, 2.92%, and 2.11%, respectively.

(3)Prepayment terms consist of (i) pre-payable with no penalty; (ii) pre-payable with penalty; (iii) pre-payable without penalty three months prior to the maturity date, however can be defeased; and (iv) pre-payable without penalty three months prior to the maturity date.

(4)The capacity of the unsecured credit facility is $500.0 million.

(5)Capacity of $200.0 million, which we have until July 12, 2020 to draw.

(6)The weighted average interest rate was calculated using the fixed interest rate swapped on the notional amount of $775.0 million of debt, and is not adjusted to include the amortization of deferred financing fees or debt issuance costs incurred in obtaining debt or any unamortized fair market value premiums.

The aggregate undrawn nominal commitments on the unsecured credit facility and unsecured term loans as of September 30, 2019 was approximately $616.0 million, including issued letters of credit. Our actual borrowing capacity at any given point in time may be less and is restricted to a maximum amount based on our debt covenant compliance.

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On July 25, 2019, we drew $175.0 million of the $175.0 million Unsecured Term Loan E that was entered into on July 26, 2018.

On July 12, 2019, we entered into the $200.0 million Unsecured Term Loan F. As of September 30, 2019, the interest rate on the Unsecured Term Loan F was LIBOR plus a spread of 1.00% based on the Company's debt rating, as defined in the loan agreement. Unless otherwise terminated pursuant to the loan agreement, the Unsecured Term Loan F will mature on January 12, 2025. The Unsecured Term Loan F has a feature that allows us to request an increase in the aggregate size of the unsecured term loan of up to $400.0 million, subject to the satisfaction of certain conditions and lender consents. The agreement includes a delayed draw feature that allows us to draw up to six advances of at least $25.0 million each until July 12, 2020. To the extent that we do not request advances of the $200.0 million of aggregate commitments by July 12, 2020, the unadvanced commitments terminate. The Unsecured Term Loan F has an unused commitment fee equal to 0.15% of its unused commitments, which began to accrue on October 10, 2019 and is due and payable monthly until the earlier of (i) the date that commitments of $200.0 million have been fully advanced, (ii) July 12, 2020, and (iii) the date that commitments of $200.0 million have been reduced to zero pursuant to the terms of the agreement. We are required to pay an annual fee of $35,000. We and certain wholly owned subsidiaries of the Operating Partnership are guarantors of the Unsecured Term Loan F. The agreement also contains financial and other covenants substantially similar to the covenants in our unsecured credit facility. As of September 30, 2019, there were no amounts outstanding under the Unsecured Term Loan F.

Our unsecured credit facility, unsecured term loans, unsecured notes, and mortgage notes are subject to ongoing compliance with a number of financial and other covenants. As of September 30, 2019, we were in compliance with the applicable financial covenants.

The following table summarizes our debt capital structure as of September 30, 2019.

Debt Capital Structure	September 30, 2019
Total principal outstanding (in thousands)	$	1,483,570
Weighted average duration (years)	4.0
% Secured debt	4		%
% Debt maturing next 12 months	10		%
Net Debt to Real Estate Cost Basis (1)	35		%

(1)We define Net Debt as our amounts outstanding under our unsecured credit facility, unsecured term loans, unsecured notes, and mortgage notes, less cash and cash equivalents. We define Real Estate Cost Basis as the book value of rental property and deferred leasing intangibles, exclusive of the related accumulated depreciation and amortization.

We regularly pursue new financing opportunities to ensure an appropriate balance sheet position. As a result of these dedicated efforts, we are confident in our ability to meet future debt maturities and building acquisition funding needs. We believe that our current balance sheet is in an adequate position at the date of this filing, despite possible volatility in the credit markets.

Our interest rate exposure as it relates to interest expense payments on our floating rate debt is managed through our use of interest rate swaps, which fix the rate of our long term floating rate debt. For a detailed discussion on our use of interest rate swaps, see “Interest Rate Risk” below.

Equity

Preferred Stock

The following table summarizes our outstanding preferred stock issuances as of September 30, 2019.

Preferred Stock Issuances	Issuance Date	Number of Shares	Liquidation Value Per Share		Interest Rate
Series C Preferred Stock	March 17, 2016	3,000,000	$	25.00	6.875	%

On April 30, 2019, we filed Articles of Amendment to our Articles of Amendment and Restatement to increase the number of authorized shares of our preferred stock from 15,000,000 to 20,000,000.

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Common Stock

The following table summarizes our at-the-market (“ATM”) common stock offering programs as of September 30, 2019. We may from time to time sell common stock through sales agents under the program.

ATM Common Stock Offering Program	Date	Maximum Aggregate Offering Price (in thousands)		Aggregate Common Stock Available as of September 30, 2019 (in thousands)
2019 $600 million ATM	February 14, 2019	$	600,000	$	401,137

On April 30, 2019, we filed Articles of Amendment to our Articles of Amendment and Restatement to increase the number of authorized shares of our common stock from 150,000,000 to 300,000,000.

The following table summarizes the activity for the ATM common stock offering programs during the three and nine months ended September 30, 2019 (in thousands, except share data).

	Three months ended September 30, 2019
ATM Common Stock Offering Program	Shares Sold	Weighted Average Price Per Share		Net Proceeds
2019 $600 million ATM	875,129	$	30.39	$	26,326
Total/weighted average	875,129	$	30.39	$	26,326

	Nine months ended September 30, 2019
ATM Common Stock Offering Program	Shares Sold	Weighted Average Price Per Share		Net Proceeds
2019 $600 million ATM	7,022,332	$	28.32	$	197,074
Total/weighted average	7,022,332	$	28.32	$	197,074

On September 24, 2019, we completed an underwritten public offering of an aggregate 12,650,000 shares of common stock at a price to the underwriters of $28.60 per share, consisting of (i) 5,500,000 shares offered directly by us and (ii) 7,150,000 shares offered by the forward dealer in connection with certain forward sale agreements (including 1,650,000 shares offered pursuant to the underwriters’ option to purchase additional shares, which option was exercised in full). The offering closed on September 27, 2019 and we received net proceeds from the sale of shares offered directly by us of $157.3 million. Subject to our right to elect cash or net share settlement, we expect to settle the forward sales agreements and receive proceeds, subject to certain adjustments, from the sale of the those shares of common stock upon one or more such physical settlements within approximately six months from the date of the prospectus supplement relating to the offering, earlier than the scheduled maturity date of the forward sale agreements of September 24, 2020.

On April 1, 2019, we completed an underwritten public offering of 7,475,000 shares of common stock (including 975,000 shares issued pursuant to the underwriters’ option to purchase additional shares, which option was exercised in full) at a price to the underwriters of $28.72 per share. The offering closed on April 4, 2019 and we received net proceeds of approximately $214.7 million.

Noncontrolling Interest

We own our interests in all of our properties and conduct substantially all of our business through the Operating Partnership. We are the sole member of the sole general partner of the Operating Partnership. As of September 30, 2019, we owned approximately 97.2% of the Operating Partnership, and our current and former executive officers, directors, senior employees and their affiliates, and third parties who contributed properties to us in exchange for common units in our Operating Partnership, owned the remaining 2.8%.

Interest Rate Risk

We use interest rate swaps to fix the rate of our variable rate debt. As of September 30, 2019, all of our outstanding variable rate debt, with the exception of our unsecured credit facility, was fixed with interest rate swaps through maturity.

We recognize all derivatives on the balance sheet at fair value. If the derivative is designated as a hedge, depending on the nature of the hedge, changes in the fair value of derivatives are either offset against the change in fair value of the hedged

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assets, liabilities, or firm commitments through earnings or recognized in other comprehensive income (loss), which is a component of equity. Derivatives that are not designated as hedges must be adjusted to fair value and the changes in fair value must be reflected as income or expense.

We have established criteria for suitable counterparties in relation to various specific types of risk. We only use counterparties that have a credit rating of no lower than investment grade at swap inception from Moody’s Investor Services, Standard & Poor’s, or Fitch Ratings or other nationally recognized rating agencies.

The following table details our outstanding interest rate swaps as of September 30, 2019.

Interest Rate Derivative Counterparty	Trade Date	Effective Date	Notional Amount (in thousands)		Fair Value (in thousands)		Pay Fixed Interest Rate		Receive Variable Interest Rate	Maturity Date
Regions Bank	Mar-01-2013	Mar-01-2013	$	25,000	$	51	1.3300	%	One-month L	Feb-14-2020
Capital One, N.A.	Jun-13-2013	Jul-01-2013	$	50,000	$	35	1.6810	%	One-month L	Feb-14-2020
Capital One, N.A.	Jun-13-2013	Aug-01-2013	$	25,000	$	16	1.7030	%	One-month L	Feb-14-2020
Regions Bank	Sep-30-2013	Feb-03-2014	$	25,000	$	(12)	1.9925	%	One-month L	Feb-14-2020
The Toronto-Dominion Bank	Oct-14-2015	Sep-29-2016	$	25,000	$	66	1.3830	%	One-month L	Sep-29-2020
PNC Bank, N.A.	Oct-14-2015	Sep-29-2016	$	50,000	$	128	1.3906	%	One-month L	Sep-29-2020
Regions Bank	Oct-14-2015	Sep-29-2016	$	35,000	$	91	1.3858	%	One-month L	Sep-29-2020
U.S. Bank, N.A.	Oct-14-2015	Sep-29-2016	$	25,000	$	63	1.3950	%	One-month L	Sep-29-2020
Capital One, N.A.	Oct-14-2015	Sep-29-2016	$	15,000	$	38	1.3950	%	One-month L	Sep-29-2020
Royal Bank of Canada	Jan-08-2015	Mar-20-2015	$	25,000	$	(56)	1.7090	%	One-month L	Mar-21-2021
The Toronto-Dominion Bank	Jan-08-2015	Mar-20-2015	$	25,000	$	(57)	1.7105	%	One-month L	Mar-21-2021
The Toronto-Dominion Bank	Jan-08-2015	Sep-10-2017	$	100,000	$	(982)	2.2255	%	One-month L	Mar-21-2021
Wells Fargo, N.A.	Jan-08-2015	Mar-20-2015	$	25,000	$	(246)	1.8280	%	One-month L	Mar-31-2022
The Toronto-Dominion Bank	Jan-08-2015	Feb-14-2020	$	25,000	$	(579)	2.4535	%	One-month L	Mar-31-2022
Regions Bank	Jan-08-2015	Feb-14-2020	$	50,000	$	(1,181)	2.4750	%	One-month L	Mar-31-2022
Capital One, N.A.	Jan-08-2015	Feb-14-2020	$	50,000	$	(1,238)	2.5300	%	One-month L	Mar-31-2022
The Toronto-Dominion Bank	Jul-20-2017	Oct-30-2017	$	25,000	$	(362)	1.8485	%	One-month L	Jan-04-2023
Royal Bank of Canada	Jul-20-2017	Oct-30-2017	$	25,000	$	(364)	1.8505	%	One-month L	Jan-04-2023
Wells Fargo, N.A.	Jul-20-2017	Oct-30-2017	$	25,000	$	(364)	1.8505	%	One-month L	Jan-04-2023
PNC Bank, N.A.	Jul-20-2017	Oct-30-2017	$	25,000	$	(362)	1.8485	%	One-month L	Jan-04-2023
PNC Bank, N.A.	Jul-20-2017	Oct-30-2017	$	50,000	$	(723)	1.8475	%	One-month L	Jan-04-2023
The Toronto-Dominion Bank	Jul-24-2018	Jul-26-2019	$	50,000	$	(3,229)	2.9180	%	One-month L	Jan-12-2024
PNC Bank, N.A.	Jul-24-2018	Jul-26-2019	$	50,000	$	(3,232)	2.9190	%	One-month L	Jan-12-2024
Bank of Montreal	Jul-24-2018	Jul-26-2019	$	50,000	$	(3,232)	2.9190	%	One-month L	Jan-12-2024
U.S. Bank, N.A.	Jul-24-2018	Jul-26-2019	$	25,000	$	(1,616)	2.9190	%	One-month L	Jan-12-2024
Wells Fargo, N.A.	May-02-2019	Jul-15-2020	$	50,000	$	(2,030)	2.2460	%	One-month L	Jan-15-2025
U.S. Bank, N.A.	May-02-2019	Jul-15-2020	$	50,000	$	(2,029)	2.2459	%	One-month L	Jan-15-2025
Regions Bank	May-02-2019	Jul-15-2020	$	50,000	$	(2,032)	2.2459	%	One-month L	Jan-15-2025
Bank of Montreal	Jul-16-2019	Jul-15-2020	$	50,000	$	(886)	1.7165	%	One-month L	Jan-15-2025

The swaps outlined in the above table were all designated as cash flow hedges of interest rate risk, and all are valued as Level 2 financial instruments. Level 2 financial instruments are defined as significant other observable inputs. As of September 30, 2019, the fair value of eight of our interest rate swaps were in an asset position of approximately $0.5 million and the fair value of 21 of our interest rate swaps were in a liability position of approximately $24.8 million, including any adjustment for nonperformance risk related to these agreements.

As of September 30, 2019, we had $853.0 million of variable rate debt. As of September 30, 2019, all of our outstanding variable rate debt, with the exception of our unsecured credit facility, was fixed with interest rate swaps through maturity. To the extent interest rates increase, interest costs on our floating rate debt not fixed with interest rate swaps will increase, which could adversely affect our cash flow and our ability to pay principal and interest on our debt and our ability to make distributions to our security holders. From time to time, we may enter into interest rate swap agreements and other interest rate hedging contracts, including swaps, caps and floors. In addition, an increase in interest rates could decrease the amounts third parties are willing to pay for our assets, thereby limiting our ability to change our portfolio promptly in response to changes in economic or other conditions.

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Off-balance Sheet Arrangements

As of September 30, 2019, we had letters of credit related to development projects and certain other agreements of approximately $6.0 million and a development commitment related to a building expansion under a tenant lease of approximately $3.1 million. As of September 30, 2019, we had no other material off-balance sheet arrangements.

Item 3.  Quantitative and Qualitative Disclosures about Market Risk

Our future income, cash flows and fair values relevant to financial instruments are dependent upon prevailing market interest rates. Market risk refers to the risk of loss from adverse changes in market prices and interest rates. The primary market risk we are exposed to is interest rate risk.  We have used derivative financial instruments to manage, or hedge, interest rate risks related to our borrowings, primarily through interest rate swaps.

As of September 30, 2019, we had $853.0 million of variable rate debt outstanding. As of September 30, 2019, all of our outstanding variable rate debt, with the exception of $78.0 million outstanding under our unsecured credit facility, was fixed with interest rate swaps. To the extent we undertake additional variable rate indebtedness, if interest rates increase, then so will the interest costs on our unhedged variable rate debt, which could adversely affect our cash flow and our ability to pay principal and interest on our debt and our ability to make distributions to our security holders. Further, rising interest rates could limit our ability to refinance existing debt when it matures or significantly increase our future interest expense. From time to time, we enter into interest rate swap agreements and other interest rate hedging contracts, including swaps, caps and floors. While these agreements are intended to lessen the impact of rising interest rates on us, they also expose us to the risk that the other parties to the agreements will not perform, we could incur significant costs associated with the settlement of the agreements, the agreements will be unenforceable and the underlying transactions will fail to qualify as highly-effective cash flow hedges under GAAP. In addition, an increase in interest rates could decrease the amounts third parties are willing to pay for our assets, thereby limiting our ability to change our portfolio promptly in response to changes in economic or other conditions. If interest rates increased by 100 basis points and assuming we had an outstanding balance of $78.0 million on our unsecured credit facility (the portion outstanding at September 30, 2019 not fixed by interest rate swaps) for the nine months ended September 30, 2019, our interest expense would have increased by approximately $0.6 million for the nine months ended September 30, 2019.

Item 4.  Controls and Procedures

Evaluation of Disclosure Controls and Procedures

As required by SEC Rule 13a-15(b), we have evaluated, under the supervision of and with the participation of management, including our Chief Executive Officer and Chief Financial Officer, the effectiveness of the design and operation of our disclosure controls and procedures, as defined in Rules 13a-15(e) and 15d-15(e) of the Exchange Act, as of September 30, 2019. Based on the foregoing, our Chief Executive Officer and Chief Financial Officer concluded that our disclosure controls and procedures for the periods covered by this report were effective to provide reasonable assurance that information required to be disclosed by our Company in reports that we file or submit under the Exchange Act is recorded, processed, summarized and reported within the time periods specified in SEC rules and forms and 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.

Changes in Internal Controls

There was no change to our internal control over financial reporting during the quarter ended September 30, 2019 that has materially affected, or is reasonably likely to materially affect, our internal control over financial reporting.

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PART II. Other Information

Item 1.  Legal Proceedings

From time to time, we are a party to various lawsuits, claims and other legal proceedings that arise in the ordinary course of our business. We are not currently a party, as plaintiff or defendant, to any legal proceedings which, individually or in the aggregate, would be expected to have a material effect on our business, financial condition or results of operations if determined adversely to our company.

Item 1A.  Risk Factors

There have been no material changes from the risk factors disclosed in the Annual Report on Form 10-K for the year ended December 31, 2018 filed with the SEC on February 13, 2019.

Item 2. Unregistered Sales of Equity Securities and Use of Proceeds

Recent Sales of Unregistered Equity Securities

During the quarter ended September 30, 2019, the Operating Partnership issued 45,815 common units in the Operating Partnership upon exchange of outstanding long term incentive plan units pursuant to the STAG Industrial, Inc. 2011 Equity Incentive Plan, as amended and restated. Subject to certain restrictions, common units in the Operating Partnership may be redeemed for cash in an amount equal to the value of a share of common stock or, at our election, for a share of common stock on a one-for-one basis.

During the quarter ended September 30, 2019, we issued 207,152 shares of common stock upon redemption of 207,152 common units in the Operating Partnership held by various limited partners.  The issuance of such shares of common stock was either registered under the Securities Act or effected in reliance upon an exemption from registration provided by Section 4(a)(2) under the Securities Act and the rules and regulations promulgated thereunder. We relied on the exemption based on representations given by the holders of the common units.

All other issuances of unregistered securities during the quarter ended September 30, 2019, if any, have previously been disclosed in filings with the SEC.

Item 3. Defaults Upon Senior Securities

None.

Item 4.  Mine Safety Disclosures

Not applicable.

Item 5.  Other Information

None.

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Item 6.  Exhibits

Exhibit  Number	Description of Document
10.1	Term Loan Agreement, dated as of July 12, 2019, by and among STAG Industrial Operating Partnership, L.P., STAG Industrial, Inc., Wells Fargo Bank, National Association, and the other lenders party thereto (1)
31.1 *	Certification of Chief Executive Officer Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002
31.2 *	Certification of Chief Financial Officer Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002
32.1 **	Certification of Chief Executive Officer 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.INS *	XBRL Instance Document - the instance document does not appear in the Interactive Data File because its XBRL tags are embedded within the Inline XBRL document
101.SCH *	XBRL Taxonomy Extension Schema Document
101.CAL *	XBRL Taxonomy Extension Calculation Linkbase Document
101.DEF *	XBRL Taxonomy Extension Definition Linkbase Document
101.LAB *	XBRL Taxonomy Extension Label Linkbase Document
101.PRE *	XBRL Taxonomy Extension Presentation Linkbase Document
104 *	Cover Page Interactive Date File (formatted as Inline XBRL and contained in Exhibit 101)

* Filed herewith.

** Furnished herewith.

(1) Incorporated by reference to STAG Industrial, Inc.’s Current Report on Form 8-K filed with the SEC on July 30, 2019.

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SIGNATURES

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

		STAG INDUSTRIAL, INC.
Date: October 30, 2019	BY:	/s/ WILLIAM R. CROOKER
		William R. Crooker
		Chief Financial Officer, Executive Vice President and Treasurer (Principal Financial Officer and Principal Accounting Officer)

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EX-31.1

Exhibit 31.1

Certification of Chief Executive Officer Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002

I, Benjamin S. Butcher, certify that:

1.I have reviewed this quarterly report on Form 10-Q of STAG Industrial, 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(s) 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(s) 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: October 30, 2019	/s/ BENJAMIN S. BUTCHER
	Benjamin S. Butcher Chairman, Chief Executive Officer and President

EX-31.2

Exhibit 31.2

Certification of Chief Financial Officer Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002

I, William R. Crooker, certify that:

1.I have reviewed this quarterly report on Form 10-Q of STAG Industrial, 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(s) 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(s) 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: October 30, 2019	/s/ WILLIAM R. CROOKER
	William R. Crooker Chief Financial Officer, Executive Vice President and Treasurer

EX-32.1

Exhibit 32.1

Certification Pursuant To

18 U.S.C. Section 1350,

as Adopted Pursuant to

Section 906 of The Sarbanes-Oxley Act of 2002

In connection with the Quarterly Report of STAG Industrial, Inc. on Form 10-Q for the period ended September 30, 2019 as filed with the Securities and Exchange Commission on the date hereof (the “Report”), the undersigned officers of STAG Industrial, Inc., certify, pursuant to 18 U.S.C. section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that:

(1)the Report, containing the financial statements, fully complies with the requirements of section 13(a) or 15(d) of the Securities Exchange Act of 1934, as amended; and

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

Date: October 30, 2019	/s/ BENJAMIN S. BUTCHER
	Benjamin S. Butcher Chairman, Chief Executive Officer and President
	/s/ WILLIAM R. CROOKER
	William R. Crooker Chief Financial Officer, Executive Vice President and Treasurer

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Leases - Maturity of Fixed Lease Payments (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Leases [Abstract]
Remainder of Fiscal Year	$ 82,584
2020	325,907
2021	285,414
2022	249,287
2023	208,011
Thereafter	$ 761,469
2019		$ 299,978
2020		271,936
2021		226,970
2022		188,707
2023		152,814
Thereafter		$ 535,192

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Earnings Per Share - Reconciliation of Numerator and Denominator (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Numerator
Net income attributable to common stockholders	$ 9,533	$ 7,237	$ 27,734	$ 38,215
Denominator
Weighted average common shares outstanding — basic	127,272	105,783	122,460	101,095
Shares issuable under forward sales agreements	19	0	6	0
Weighted average common shares outstanding — diluted	127,469	106,333	122,720	101,495
Net income per share — basic and diluted
Net income per share attributable to common stockholders — basic	$ 0.07	$ 0.07	$ 0.23	$ 0.38
Net income per share attributable to common stockholders — diluted	$ 0.07	$ 0.07	$ 0.23	$ 0.38
Restricted stock
Net income per share — basic and diluted
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	220	193	218	197
Stock Compensation Plan
Denominator
Share-based compensation	178	550	254	400

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Derivative Financial Instruments - FV on Recurring Basis (Details) - Interest Rate Swaps - Fair value on recurring basis - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Assets (liabilities):
Interest rate swaps-Asset	$ 488	$ 9,151
Interest rate swaps-Liability	(24,812)	(4,011)
Level 1
Assets (liabilities):
Interest rate swaps-Asset	0	0
Interest rate swaps-Liability	0	0
Level 2
Assets (liabilities):
Interest rate swaps-Asset	488	9,151
Interest rate swaps-Liability	(24,812)	(4,011)
Level 3
Assets (liabilities):
Interest rate swaps-Asset	0	0
Interest rate swaps-Liability	$ 0	$ 0

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Consolidated Statements of Equity - USD ($) $ in Thousands	Total	Preferred Stock	Common Stock	Additional Paid-in Capital	Cumulative Dividends in excess of Earnings	Accumulated Other Comprehensive Income (Loss)	Total Stockholders' Equity	Noncontrolling Interest - Unit holders in Operating Partnership
Balance at Dec. 31, 2017	$ 1,410,307	$ 145,000	$ 970	$ 1,725,825	$ (516,691)	$ 3,936	$ 1,359,040	$ 51,267
Balance (in shares) at Dec. 31, 2017			97,012,543
Increase (Decrease) in Stockholders' Equity
Cumulative effect on retained earnings					(258)	247	(11)	11
Proceeds from sales of common stock, net	273,328		$ 104	273,224			273,328
Proceeds from sales of common stock (in shares)			10,387,962
Redemption of preferred stock	(70,017)	(70,000)		(5,141)	(5,158)		(70,017)
Dividends, Common Stock					(114,541)
Dividends							(114,541)
Dividends and Distributions, Net	(119,794)
Distribution Made to Limited Partner, Cash Distributions Declared								(5,253)
Non-cash compensation activity, net	5,173			1,829			1,293	3,880
Non-cash compensation activity (in shares)			73,231
Non-cash compensation activity (in excess of earnings)			$ (1)		(537)
Redemption of common units to common stock			$ 3	4,398			4,401	(4,401)
Redemption of common units to common stock (in shares)			352,055
Rebalancing of noncontrolling interest				(6,434)			(6,434)	6,434
Other comprehensive loss	12,811					12,302	12,302	509
Net income	48,989				47,400		47,400	1,589
Balance at Sep. 30, 2018	1,560,797	75,000	$ 1,078	2,003,983	(589,785)	16,485	1,506,761	54,036
Balance (in shares) at Sep. 30, 2018			107,825,791
Balance at Dec. 31, 2017	1,410,307	145,000	$ 970	1,725,825	(516,691)	3,936	1,359,040	$ 51,267
Balance (in shares) at Dec. 31, 2017			97,012,543
Increase (Decrease) in Stockholders' Equity
Redemption of common units to common stock (in shares)								0
Balance at Dec. 31, 2018	1,669,632	75,000	$ 1,122	2,118,179	(584,979)	4,481	1,613,803	$ 55,829
Balance (in shares) at Dec. 31, 2018			112,165,786
Balance at Jun. 30, 2018	1,489,627	75,000	$ 1,042	1,905,002	(559,312)	14,492	1,436,224	53,403
Balance (in shares) at Jun. 30, 2018			104,238,166
Increase (Decrease) in Stockholders' Equity
Proceeds from sales of common stock, net	98,517		$ 36	98,481			98,517
Proceeds from sales of common stock (in shares)			3,568,382
Dividends, Common Stock					(39,094)
Dividends							(39,094)
Dividends and Distributions, Net	(40,537)
Distribution Made to Limited Partner, Cash Distributions Declared								(1,443)
Non-cash compensation activity, net	2,254			1,361			1,361	893
Non-cash compensation activity (in shares)			(757)
Non-cash compensation activity (in excess of earnings)			$ 0		0
Redemption of common units to common stock			$ 0	261			261	(261)
Redemption of common units to common stock (in shares)			20,000
Rebalancing of noncontrolling interest				(1,122)			(1,122)	1,122
Other comprehensive loss	2,060					1,993	1,993	67
Net income	8,876				8,621		8,621	255
Balance at Sep. 30, 2018	1,560,797	75,000	$ 1,078	2,003,983	(589,785)	16,485	1,506,761	54,036
Balance (in shares) at Sep. 30, 2018			107,825,791
Balance at Dec. 31, 2018	1,669,632	75,000	$ 1,122	2,118,179	(584,979)	4,481	1,613,803	55,829
Balance (in shares) at Dec. 31, 2018			112,165,786
Increase (Decrease) in Stockholders' Equity
Cumulative effect on retained earnings	(214)				(214)
Proceeds from sales of common stock, net	568,077		$ 201	567,876			568,077
Proceeds from sales of common stock (in shares)			19,997,332
Dividends, Common Stock					(136,595)
Dividends							(136,595)
Dividends and Distributions, Net	(141,842)
Distribution Made to Limited Partner, Cash Distributions Declared								5,247
Non-cash compensation activity, net	5,994			2,198			1,826	4,168
Non-cash compensation activity (in shares)			134,188
Non-cash compensation activity (in excess of earnings)			$ (1)		(373)
Redemption of common units to common stock			$ 6	9,232			9,238	$ (9,238)
Redemption of common units to common stock (in shares)			661,082					0
Rebalancing of noncontrolling interest				(10,367)			(10,367)	$ 10,367
Other comprehensive loss	(29,441)					(28,511)	(28,511)	(930)
Net income	32,749				31,837		31,837	912
Balance at Sep. 30, 2019	2,104,955	75,000	$ 1,330	2,687,118	(690,324)	(24,030)	2,049,094	55,861
Balance (in shares) at Sep. 30, 2019			132,958,388
Balance at Jun. 30, 2019	1,963,252	75,000	$ 1,264	2,501,013	(653,759)	(17,771)	1,905,747	57,505
Balance (in shares) at Jun. 30, 2019			126,372,945
Increase (Decrease) in Stockholders' Equity
Proceeds from sales of common stock, net	183,212		$ 64	183,148			183,212
Proceeds from sales of common stock (in shares)			6,375,129
Dividends, Common Stock					(47,465)
Dividends							(47,465)
Dividends and Distributions, Net	(48,840)
Distribution Made to Limited Partner, Cash Distributions Declared								(1,375)
Non-cash compensation activity, net	2,576			1,675			1,675	901
Non-cash compensation activity (in shares)			3,162
Non-cash compensation activity (in excess of earnings)			$ 0		0
Redemption of common units to common stock			$ 2	3,001			3,003	(3,003)
Redemption of common units to common stock (in shares)			207,152
Rebalancing of noncontrolling interest				(1,719)			(1,719)	1,719
Other comprehensive loss	(6,435)					(6,259)	(6,259)	(176)
Net income	11,190				10,900		10,900	290
Balance at Sep. 30, 2019	$ 2,104,955	$ 75,000	$ 1,330	$ 2,687,118	$ (690,324)	$ (24,030)	$ 2,049,094	$ 55,861
Balance (in shares) at Sep. 30, 2019			132,958,388

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Consolidated Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Rental Property:
Land	$ 420,215	$ 364,023
Buildings and improvements, net of accumulated depreciation of $367,088 and $316,930, respectively	2,788,766	2,285,663
Deferred leasing intangibles, net of accumulated amortization of $241,323 and $246,502, respectively	413,955	342,015
Total rental property, net	3,622,936	2,991,701
Cash and cash equivalents	6,540	7,968
Restricted cash	2,733	14,574
Tenant accounts receivable	50,460	42,236
Prepaid expenses and other assets	46,707	36,902
Interest rate swaps	488	9,151
Operating lease right-of-use assets	15,425	0
Total assets	3,745,289	3,102,532
Liabilities:
Unsecured credit facility	78,000	100,500
Unsecured term loans, net	771,037	596,360
Unsecured notes, net	572,783	572,488
Mortgage notes, net	55,210	56,560
Accounts payable, accrued expenses and other liabilities	63,572	45,507
Interest rate swaps	24,812	4,011
Tenant prepaid rent and security deposits	21,131	22,153
Dividends and distributions payable	16,293	13,754
Deferred leasing intangibles, net of accumulated amortization of $11,259 and $12,764, respectively	20,237	21,567
Operating lease liabilities	17,259	0
Total liabilities	1,640,334	1,432,900
Preferred stock, par value $0.01 per share, 20,000,000 and 15,000,000 shares authorized at September 30, 2019 and December 31, 2018, respectively,
Common stock, par value $0.01 per share, 300,000,000 and 150,000,000 shares authorized at September 30, 2019 and December 31, 2018, respectively, 132,958,388 and 112,165,786 shares issued and outstanding at September 30, 2019 and December 31, 2018, respectively	1,330	1,122
Additional paid-in capital	2,687,118	2,118,179
Cumulative dividends in excess of earnings	(690,324)	(584,979)
Accumulated other comprehensive income (loss)	(24,030)	4,481
Total stockholders’ equity	2,049,094	1,613,803
Noncontrolling interest	55,861	55,829
Total equity	2,104,955	1,669,632
Total liabilities and equity	$ 3,745,289	$ 3,102,532
Preferred stock, par value (in dollars per share)	$ 0.01	$ 0.01
Series C Preferred Stock
Preferred stock, par value $0.01 per share, 20,000,000 and 15,000,000 shares authorized at September 30, 2019 and December 31, 2018, respectively,
Preferred stock	$ 75,000	$ 75,000

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Debt - Fair Value (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Debt Instrument [Line Items]
Long-term debt, gross	$ 1,483,570	$ 1,332,511
Unamortized fair market value premium	42	50
Unamortized debt issuance costs	(6,582)	(6,653)
Principal outstanding	1,477,030	1,325,908
Long-term debt, fair value	1,528,221	1,343,081
Unsecured Credit Facility
Debt Instrument [Line Items]
Principal outstanding	78,000	100,500
Long-term debt, fair value	78,000	100,500
Unsecured Term Loans
Debt Instrument [Line Items]
Long-term debt, gross	775,000	600,000
Unamortized debt issuance costs	(3,963)	(3,640)
Principal outstanding	771,037	596,360
Long-term debt, fair value	775,000	600,000
Unsecured Notes
Debt Instrument [Line Items]
Long-term debt, gross	575,000	575,000
Unamortized debt issuance costs	(2,217)	(2,512)
Principal outstanding	572,783	572,488
Long-term debt, fair value	618,594	585,292
Mortgage Loans Payable
Debt Instrument [Line Items]
Long-term debt, gross	55,570	57,011
Unamortized fair market value premium	42	50
Unamortized debt issuance costs	(402)	(501)
Principal outstanding	55,210	56,560
Long-term debt, fair value	$ 56,627	$ 57,289

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Rental Property (Tables)

9 Months Ended

Sep. 30, 2019

Real Estate [Abstract]

Schedule of components of rental property

The following table summarizes the components of rental property as of September 30, 2019 and December 31, 2018.

Rental Property (in thousands)	September 30, 2019		December 31, 2018
Land	$	420,215	$	364,023
Buildings, net of accumulated depreciation of $240,968 and $199,497, respectively	2,520,684		2,082,781
Tenant improvements, net of accumulated depreciation of $20,979 and $36,450, respectively	33,829		30,704
Building and land improvements, net of accumulated depreciation of $105,141 and $80,983, respectively	210,558		168,229
Construction in progress	23,695		3,949
Deferred leasing intangibles, net of accumulated amortization of $241,323 and $246,502, respectively	413,955		342,015
Total rental property, net	$	3,622,936	$	2,991,701

Schedule of real estate properties acquired

The following table summarizes the acquisitions of the Company during the three and nine months ended September 30, 2019.

Market (1)	Date Acquired	Square Feet	Buildings	Purchase Price (in thousands)
Cincinnati/Dayton, OH	January 24, 2019	176,000	1	$	9,965
Pittsburgh, PA	February 21, 2019	455,000	1	28,676
Boston, MA	February 21, 2019	349,870	1	26,483
Minneapolis/St Paul, MN	February 28, 2019	248,816	1	21,955
Greenville/Spartanburg, SC	March 7, 2019	331,845	1	24,536
Philadelphia, PA	March 7, 2019	148,300	1	10,546
Omaha/Council Bluffs, NE-IA	March 11, 2019	237,632	1	20,005
Houston, TX	March 28, 2019	132,000	1	17,307
Baltimore, MD	March 28, 2019	167,410	1	13,648
Houston, TX	March 28, 2019	116,750	1	12,242
Three months ended March 31, 2019		2,363,623	10	185,363
Minneapolis/St Paul, MN	April 2, 2019	100,600	1	9,045
West Michigan, MI	April 8, 2019	230,200	1	15,786
Greensboro/Winston-Salem, NC	April 12, 2019	129,600	1	7,771
Greenville/Spartanburg, SC	April 25, 2019	319,660	2	15,432
Charleston/N Charleston, SC	April 29, 2019	500,355	1	40,522
Houston, TX	April 29, 2019	128,136	1	13,649
Richmond, VA	May 16, 2019	109,520	1	9,467
Laredo, TX	June 6, 2019	213,982	1	18,972
Baton Rouge, LA	June 18, 2019	252,800	2	20,041
Philadelphia, PA	June 19, 2019	187,569	2	13,645
Columbus, OH	June 28, 2019	857,390	1	95,828
Three months ended June 30, 2019		3,029,812	14	260,158
Kansas City, MO	July 10, 2019	304,840	1	13,450
Houston, TX	July 22, 2019	199,903	1	11,287
Charleston/N Charleston, SC	July 22, 2019	88,583	1	7,166
Tampa, FL	August 5, 2019	78,560	1	8,168
Philadelphia, PA	August 6, 2019	120,000	1	10,880
Milwaukee/Madison, WI	August 16, 2019	224,940	3	13,981
Houston, TX	August 19, 2019	45,000	1	6,190
West Michigan, MI	August 19, 2019	210,120	1	10,407
Pittsburgh, PA	August 21, 2019	410,389	1	31,219
Boston, MA	August 22, 2019	80,100	1	14,253
Las Vegas, NV	August 27, 2019	80,422	2	12,602
Nashville, TN	August 29, 2019	348,880	1	20,267
Columbia, SC	August 30, 2019	200,000	1	13,670
Pittsburgh, PA	September 6, 2019	138,270	1	9,323
Omaha/Council Bluffs, NE-IA	September 11, 2019	128,200	2	8,509
Pittsburgh, PA	September 16, 2019	315,634	1	28,712
Memphis, TN	September 19, 2019	1,135,453	1	50,941
Memphis, TN	September 26, 2019	629,086	1	31,542
Three months ended September 30, 2019		4,738,380	22	302,567
Nine months ended September 30, 2019		10,131,815	46	$	748,088

(1) As defined by CoStar Realty Information Inc (“CoStar”). If the building is located outside of a CoStar defined market, the city and state is reflected.

Summary of allocation of the consideration paid for the acquired assets and liabilities in connection with the acquisition of buildings at the date of acquisition

The following table summarizes the allocation of the consideration paid at the date of acquisition during the nine months ended September 30, 2019 for the acquired assets and liabilities in connection with the acquisitions identified in the table above.

Acquired Assets and Liabilities	Purchase Price (in thousands)		Weighted Average Amortization Period (years) of Intangibles at Acquisition
Land	$	63,317	N/A
Buildings	499,255		N/A
Tenant improvements	6,246		N/A
Building and land improvements	45,869		N/A
Construction in progress	2,032		N/A
Other assets	2,513		N/A
Deferred leasing intangibles - In-place leases	76,628		8.9
Deferred leasing intangibles - Tenant relationships	36,008		11.7
Deferred leasing intangibles - Above market leases	19,449		12.8
Deferred leasing intangibles - Below market leases	(3,229)		6.9
Total purchase price	$	748,088

Schedule of pro forma information for acquired properties

The following table summarizes the results of operations for the three and nine months ended September 30, 2019 for the buildings acquired during the nine months ended September 30, 2019 included in the Company’s Consolidated Statements of Operations from the date of acquisition.

Results of Operations (in thousands)	Three months ended September 30, 2019		Nine months ended September 30, 2019
Total revenue	$	10,616	$	17,307
Net income	$	2,173	$	2,985

Impaired Assets to be Disposed of by Method Other than Sale [Table Text Block]

Loss on Impairments

The following table summarizes the Company’s loss on impairments for assets held and used during the nine months ended September 30, 2019.

Market(1)	Buildings	Event or Change in Circumstance Leading to Impairment Evaluation(2)		Valuation technique utilized to estimate fair value		Fair Value(3)		Loss on Impairments
						(in thousands)
Rapid City, SD(4)	1	Change in estimated hold period	(5)	Discounted cash flows	(6)
Three months ended March 31, 2019						$	4,373	$	5,344
Belfast, ME(4)	5	Market leasing conditions		Discounted cash flows	(7)
Three months ended September 30, 2019						$	5,950	$	4,413
Nine months ended September 30, 2019						$	10,323	$	9,757

(1)As defined by CoStar. If the building is located outside of a CoStar defined market, the city and state is reflected.

(2)The Company tested the asset group for impairment utilizing a probability weighted recovery analysis of certain scenarios, and it was determined that the carrying value of the property and intangibles were not recoverable from the estimated future undiscounted cash flows.

(3)The estimated fair value of the property is based on Level 3 inputs and is a non-recurring fair value measurement. Level 3 is defined as unobservable inputs in which little or no market data exists, therefore requiring an entity to develop its own assumptions.

(4)Flex/office buildings.

(5)This property was sold during the three months ended September 30, 2019.

(6)Level 3 inputs used to determine fair value for the property impaired for the three months ended March 31, 2019: discount rate of 12.0% and exit capitalization rate of 12.0%.

(7)Level 3 inputs used to determine fair value for the property impaired for the three months ended September 30, 2019: discount rate of 13.0% and exit capitalization rate of 12.0%.

Schedule of Finite-Lived Intangible Assets and Below Market Leases

The following table summarizes the deferred leasing intangibles on the accompanying Consolidated Balance Sheets as of September 30, 2019 and December 31, 2018.

	September 30, 2019						December 31, 2018
Deferred Leasing Intangibles (in thousands)	Gross		Accumulated Amortization		Net		Gross		Accumulated Amortization		Net
Above market leases	$	88,388	$	(33,439)	$	54,949	$	73,122	$	(31,059)	$	42,063
Other intangible lease assets	566,890		(207,884)		359,006		515,395		(215,443)		299,952
Total deferred leasing intangible assets	$	655,278	$	(241,323)	$	413,955	$	588,517	$	(246,502)	$	342,015
Below market leases	$	31,496	$	(11,259)	$	20,237	$	34,331	$	(12,764)	$	21,567
Total deferred leasing intangible liabilities	$	31,496	$	(11,259)	$	20,237	$	34,331	$	(12,764)	$	21,567

The following table summarizes the amortization expense and the net decrease to rental income for the amortization of deferred leasing intangibles during the three and nine months ended September 30, 2019 and 2018.

	Three months ended September 30,				Nine months ended September 30,
Deferred Leasing Intangibles Amortization (in thousands)	2019		2018		2019		2018
Net decrease to rental income related to above and below market lease amortization	$	1,248	$	1,150	$	3,361	$	3,206
Amortization expense related to other intangible lease assets	$	18,472	$	20,361	$	53,185	$	56,698

Schedule of Finite-Lived Intangible Assets, Future Amortization Expense

The following table summarizes the amortization of deferred leasing intangibles over the next five calendar years beginning with 2019 as of September 30, 2019.

Year	Amortization Expense Related to Other Intangible Lease Assets (in thousands)		Net Decrease to Rental Income Related to Above and Below Market Lease Amortization (in thousands)
Remainder of 2019	$	18,698	$	1,283
2020	$	66,090	$	4,870
2021	$	54,264	$	3,559
2022	$	45,234	$	2,657
2023	$	37,492	$	2,608

Below Market Lease, Future Amortization Income

The following table summarizes the amortization of deferred leasing intangibles over the next five calendar years beginning with 2019 as of September 30, 2019.

Year	Amortization Expense Related to Other Intangible Lease Assets (in thousands)		Net Decrease to Rental Income Related to Above and Below Market Lease Amortization (in thousands)
Remainder of 2019	$	18,698	$	1,283
2020	$	66,090	$	4,870
2021	$	54,264	$	3,559
2022	$	45,234	$	2,657
2023	$	37,492	$	2,608

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Noncontrolling Interest (Tables)

9 Months Ended

Sep. 30, 2019

Noncontrolling Interest [Abstract]

Noncontrolling interest activity

The following table summarizes the activity for noncontrolling interest in the Company for the nine months ended September 30, 2019 and the year ended December 31, 2018.

Noncontrolling Interest	LTIP Units	Other Common Units	Total Noncontrolling Common Units	Noncontrolling Interest
Balance at December 31, 2017	1,457,070	2,639,617	4,096,687	4.1	%
Granted/Issued	324,802	—	324,802	N/A
Forfeited	—	—	—	N/A
Conversions from LTIP units to Other Common Units	(165,672)	165,672	—	N/A
Redemptions from Other Common Units to common stock	—	(352,055)	(352,055)	N/A
Balance at December 31, 2018	1,616,200	2,453,234	4,069,434	3.5	%
Granted/Issued	364,173	—	364,173	N/A
Forfeited	(10,208)	—	(10,208)	N/A
Conversions from LTIP units to Other Common Units	(262,847)	262,847	—	N/A
Redemptions from Other Common Units to common stock	—	(661,082)	(661,082)	N/A
Balance at September 30, 2019	1,707,318	2,054,999	3,762,317	2.8	%

Schedule of share-based payment award, LTIP unit awards, valuation assumptions

The following table summarizes the assumptions used in valuing such LTIP units granted during the nine months ended September 30, 2019 (excluding those LTIP units granted pursuant to the March 8, 2016 performance units; refer to Note 8 for details).

LTIP Units	Assumptions
Grant date	January 7, 2019
Expected term (years)	10
Expected volatility	19.0		%
Expected dividend yield	6.0		%
Risk-free interest rate	2.57		%
Fair value of LTIP units at issuance (in thousands)	$	3,636
LTIP units at issuance	154,649
Fair value unit price per LTIP unit at issuance	$	23.51

Schedule of activity related to unvested LTIP unit awards

The following table summarizes activity related to the Company’s unvested LTIP units for the nine months ended September 30, 2019 and the year ended December 31, 2018.

Unvested LTIP Units	LTIP Units
Balance at December 31, 2017	300,307
Granted	324,802
Vested	(373,893)
Forfeited	—
Balance at December 31, 2018	251,216
Granted	364,173
Vested	(234,330)
Forfeited	(10,208)
Balance at September 30, 2019	370,851

Schedule of vested LTIP unit award activity

The following table summarizes the fair value at vesting for the LTIP units that vested during the three and nine months ended September 30, 2019 and 2018.

	Three months ended September 30,				Nine months ended September 30,
Vested LTIP units	2019		2018		2019		2018
Vested LTIP units	29,989		30,949		234,330		342,940
Fair value of vested LTIP units (in thousands)	$	884	$	851	$	6,348	$	9,002

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Rental Property - Acquisitions - Results of Operations (Details) - Acquisitions 2019 [Member] - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2019
Business Acquisition [Line Items]
Revenue	$ 10,616	$ 17,307
Net income (loss)	$ 2,173	$ 2,985

XML

Summary of Significant Accounting Policies - Taxes (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018
Business Acquisition [Line Items]
Net income	$ 11,190,000	$ 8,876,000	$ 32,749,000	$ 48,989,000
State and local income, excise and franchise taxes	300,000	100,000	900,000	600,000
Liabilities for uncertain tax positions	0		0		$ 0
Real Estate Investment Trust
Business Acquisition [Line Items]
Net income	$ 0	$ (22,000)	$ 300,000	$ (100,000)

XML

Rental Property

9 Months Ended

Sep. 30, 2019

Real Estate [Abstract]

Rental Property

Rental Property

The following table summarizes the components of rental property as of September 30, 2019 and December 31, 2018.

Rental Property (in thousands)	September 30, 2019		December 31, 2018
Land	$	420,215	$	364,023
Buildings, net of accumulated depreciation of $240,968 and $199,497, respectively	2,520,684		2,082,781
Tenant improvements, net of accumulated depreciation of $20,979 and $36,450, respectively	33,829		30,704
Building and land improvements, net of accumulated depreciation of $105,141 and $80,983, respectively	210,558		168,229
Construction in progress	23,695		3,949
Deferred leasing intangibles, net of accumulated amortization of $241,323 and $246,502, respectively	413,955		342,015
Total rental property, net	$	3,622,936	$	2,991,701

Acquisitions

The following table summarizes the acquisitions of the Company during the three and nine months ended September 30, 2019.

Market (1)	Date Acquired	Square Feet	Buildings	Purchase Price (in thousands)
Cincinnati/Dayton, OH	January 24, 2019	176,000	1	$	9,965
Pittsburgh, PA	February 21, 2019	455,000	1	28,676
Boston, MA	February 21, 2019	349,870	1	26,483
Minneapolis/St Paul, MN	February 28, 2019	248,816	1	21,955
Greenville/Spartanburg, SC	March 7, 2019	331,845	1	24,536
Philadelphia, PA	March 7, 2019	148,300	1	10,546
Omaha/Council Bluffs, NE-IA	March 11, 2019	237,632	1	20,005
Houston, TX	March 28, 2019	132,000	1	17,307
Baltimore, MD	March 28, 2019	167,410	1	13,648
Houston, TX	March 28, 2019	116,750	1	12,242
Three months ended March 31, 2019		2,363,623	10	185,363
Minneapolis/St Paul, MN	April 2, 2019	100,600	1	9,045
West Michigan, MI	April 8, 2019	230,200	1	15,786
Greensboro/Winston-Salem, NC	April 12, 2019	129,600	1	7,771
Greenville/Spartanburg, SC	April 25, 2019	319,660	2	15,432
Charleston/N Charleston, SC	April 29, 2019	500,355	1	40,522
Houston, TX	April 29, 2019	128,136	1	13,649
Richmond, VA	May 16, 2019	109,520	1	9,467
Laredo, TX	June 6, 2019	213,982	1	18,972
Baton Rouge, LA	June 18, 2019	252,800	2	20,041
Philadelphia, PA	June 19, 2019	187,569	2	13,645
Columbus, OH	June 28, 2019	857,390	1	95,828
Three months ended June 30, 2019		3,029,812	14	260,158
Kansas City, MO	July 10, 2019	304,840	1	13,450
Houston, TX	July 22, 2019	199,903	1	11,287
Charleston/N Charleston, SC	July 22, 2019	88,583	1	7,166
Tampa, FL	August 5, 2019	78,560	1	8,168
Philadelphia, PA	August 6, 2019	120,000	1	10,880
Milwaukee/Madison, WI	August 16, 2019	224,940	3	13,981
Houston, TX	August 19, 2019	45,000	1	6,190
West Michigan, MI	August 19, 2019	210,120	1	10,407
Pittsburgh, PA	August 21, 2019	410,389	1	31,219
Boston, MA	August 22, 2019	80,100	1	14,253
Las Vegas, NV	August 27, 2019	80,422	2	12,602
Nashville, TN	August 29, 2019	348,880	1	20,267
Columbia, SC	August 30, 2019	200,000	1	13,670
Pittsburgh, PA	September 6, 2019	138,270	1	9,323
Omaha/Council Bluffs, NE-IA	September 11, 2019	128,200	2	8,509
Pittsburgh, PA	September 16, 2019	315,634	1	28,712
Memphis, TN	September 19, 2019	1,135,453	1	50,941
Memphis, TN	September 26, 2019	629,086	1	31,542
Three months ended September 30, 2019		4,738,380	22	302,567
Nine months ended September 30, 2019		10,131,815	46	$	748,088

(1) As defined by CoStar Realty Information Inc (“CoStar”). If the building is located outside of a CoStar defined market, the city and state is reflected.

The following table summarizes the allocation of the consideration paid at the date of acquisition during the nine months ended September 30, 2019 for the acquired assets and liabilities in connection with the acquisitions identified in the table above.

Acquired Assets and Liabilities	Purchase Price (in thousands)		Weighted Average Amortization Period (years) of Intangibles at Acquisition
Land	$	63,317	N/A
Buildings	499,255		N/A
Tenant improvements	6,246		N/A
Building and land improvements	45,869		N/A
Construction in progress	2,032		N/A
Other assets	2,513		N/A
Deferred leasing intangibles - In-place leases	76,628		8.9
Deferred leasing intangibles - Tenant relationships	36,008		11.7
Deferred leasing intangibles - Above market leases	19,449		12.8
Deferred leasing intangibles - Below market leases	(3,229)		6.9
Total purchase price	$	748,088

The following table summarizes the results of operations for the three and nine months ended September 30, 2019 for the buildings acquired during the nine months ended September 30, 2019 included in the Company’s Consolidated Statements of Operations from the date of acquisition.

Results of Operations (in thousands)	Three months ended September 30, 2019		Nine months ended September 30, 2019
Total revenue	$	10,616	$	17,307
Net income	$	2,173	$	2,985

Dispositions

During the nine months ended September 30, 2019, the Company sold six buildings and two land parcels comprised of approximately 1.1 million rentable square feet with a net book value of approximately $20.4 million to third parties. These buildings and land parcels contributed approximately $20,000, $0.8 million, $1.5 million, and $5.3 million to revenue for the three and nine months ended September 30, 2019 and 2018, respectively. These buildings and land parcels contributed approximately $(0.1) million, $(0.2) million, $0.5 million, and $0.9 million to net income (loss) (exclusive of loss on impairments and gain on the sales of rental property, net) for the three and nine months ended September 30, 2019 and 2018, respectively. Net proceeds from the sales of rental property were approximately $23.7 million and the Company recognized the full gain on the sales of rental property, net, of approximately $3.3 million for the nine months ended September 30, 2019.

Loss on Impairments

The following table summarizes the Company’s loss on impairments for assets held and used during the nine months ended September 30, 2019.

Market(1)	Buildings	Event or Change in Circumstance Leading to Impairment Evaluation(2)		Valuation technique utilized to estimate fair value		Fair Value(3)		Loss on Impairments
						(in thousands)
Rapid City, SD(4)	1	Change in estimated hold period	(5)	Discounted cash flows	(6)
Three months ended March 31, 2019						$	4,373	$	5,344
Belfast, ME(4)	5	Market leasing conditions		Discounted cash flows	(7)
Three months ended September 30, 2019						$	5,950	$	4,413
Nine months ended September 30, 2019						$	10,323	$	9,757

(1)As defined by CoStar. If the building is located outside of a CoStar defined market, the city and state is reflected.

(2)The Company tested the asset group for impairment utilizing a probability weighted recovery analysis of certain scenarios, and it was determined that the carrying value of the property and intangibles were not recoverable from the estimated future undiscounted cash flows.

(3)The estimated fair value of the property is based on Level 3 inputs and is a non-recurring fair value measurement. Level 3 is defined as unobservable inputs in which little or no market data exists, therefore requiring an entity to develop its own assumptions.

(4)Flex/office buildings.

(5)This property was sold during the three months ended September 30, 2019.

(6)Level 3 inputs used to determine fair value for the property impaired for the three months ended March 31, 2019: discount rate of 12.0% and exit capitalization rate of 12.0%.

(7)Level 3 inputs used to determine fair value for the property impaired for the three months ended September 30, 2019: discount rate of 13.0% and exit capitalization rate of 12.0%.

Deferred Leasing Intangibles

The following table summarizes the deferred leasing intangibles on the accompanying Consolidated Balance Sheets as of September 30, 2019 and December 31, 2018.

	September 30, 2019						December 31, 2018
Deferred Leasing Intangibles (in thousands)	Gross		Accumulated Amortization		Net		Gross		Accumulated Amortization		Net
Above market leases	$	88,388	$	(33,439)	$	54,949	$	73,122	$	(31,059)	$	42,063
Other intangible lease assets	566,890		(207,884)		359,006		515,395		(215,443)		299,952
Total deferred leasing intangible assets	$	655,278	$	(241,323)	$	413,955	$	588,517	$	(246,502)	$	342,015
Below market leases	$	31,496	$	(11,259)	$	20,237	$	34,331	$	(12,764)	$	21,567
Total deferred leasing intangible liabilities	$	31,496	$	(11,259)	$	20,237	$	34,331	$	(12,764)	$	21,567

The following table summarizes the amortization expense and the net decrease to rental income for the amortization of deferred leasing intangibles during the three and nine months ended September 30, 2019 and 2018.

	Three months ended September 30,				Nine months ended September 30,
Deferred Leasing Intangibles Amortization (in thousands)	2019		2018		2019		2018
Net decrease to rental income related to above and below market lease amortization	$	1,248	$	1,150	$	3,361	$	3,206
Amortization expense related to other intangible lease assets	$	18,472	$	20,361	$	53,185	$	56,698

The following table summarizes the amortization of deferred leasing intangibles over the next five calendar years beginning with 2019 as of September 30, 2019.

Year	Amortization Expense Related to Other Intangible Lease Assets (in thousands)		Net Decrease to Rental Income Related to Above and Below Market Lease Amortization (in thousands)
Remainder of 2019	$	18,698	$	1,283
2020	$	66,090	$	4,870
2021	$	54,264	$	3,559
2022	$	45,234	$	2,657
2023	$	37,492	$	2,608

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Noncontrolling Interest

9 Months Ended

Sep. 30, 2019

Noncontrolling Interest [Abstract]

Noncontrolling Interest

Noncontrolling Interest

The following table summarizes the activity for noncontrolling interest in the Company for the nine months ended September 30, 2019 and the year ended December 31, 2018.

Noncontrolling Interest	LTIP Units	Other Common Units	Total Noncontrolling Common Units	Noncontrolling Interest
Balance at December 31, 2017	1,457,070	2,639,617	4,096,687	4.1	%
Granted/Issued	324,802	—	324,802	N/A
Forfeited	—	—	—	N/A
Conversions from LTIP units to Other Common Units	(165,672)	165,672	—	N/A
Redemptions from Other Common Units to common stock	—	(352,055)	(352,055)	N/A
Balance at December 31, 2018	1,616,200	2,453,234	4,069,434	3.5	%
Granted/Issued	364,173	—	364,173	N/A
Forfeited	(10,208)	—	(10,208)	N/A
Conversions from LTIP units to Other Common Units	(262,847)	262,847	—	N/A
Redemptions from Other Common Units to common stock	—	(661,082)	(661,082)	N/A
Balance at September 30, 2019	1,707,318	2,054,999	3,762,317	2.8	%

LTIP Units

LTIP units granted on January 7, 2019 to non-employee, independent directors, subject to the recipient’s continued service, will vest on January 1, 2020. LTIP units granted on January 7, 2019 to certain senior executive officers and senior employees, subject to the recipient’s continued employment, will vest quarterly over four years, with the first vesting date having been March 31, 2019. Refer to Note 8 for a discussion of the LTIP units granted on January 7, 2019 pursuant to the March 8, 2016 performance units.

The fair value of the LTIP units at the date of grant was determined by a lattice-binomial option-pricing model based on a Monte Carlo simulation. The fair value of the LTIP units are based on Level 3 inputs and are non-recurring fair value measurements. The following table summarizes the assumptions used in valuing such LTIP units granted during the nine months ended September 30, 2019 (excluding those LTIP units granted pursuant to the March 8, 2016 performance units; refer to Note 8 for details).

LTIP Units	Assumptions
Grant date	January 7, 2019
Expected term (years)	10
Expected volatility	19.0		%
Expected dividend yield	6.0		%
Risk-free interest rate	2.57		%
Fair value of LTIP units at issuance (in thousands)	$	3,636
LTIP units at issuance	154,649
Fair value unit price per LTIP unit at issuance	$	23.51

The following table summarizes activity related to the Company’s unvested LTIP units for the nine months ended September 30, 2019 and the year ended December 31, 2018.

Unvested LTIP Units	LTIP Units
Balance at December 31, 2017	300,307
Granted	324,802
Vested	(373,893)
Forfeited	—
Balance at December 31, 2018	251,216
Granted	364,173
Vested	(234,330)
Forfeited	(10,208)
Balance at September 30, 2019	370,851

The unrecognized compensation expense associated with the Company’s LTIP units at September 30, 2019 was approximately $5.5 million and is expected to be recognized over a weighted average period of approximately 2.3 years.

The following table summarizes the fair value at vesting for the LTIP units that vested during the three and nine months ended September 30, 2019 and 2018.

	Three months ended September 30,				Nine months ended September 30,
Vested LTIP units	2019		2018		2019		2018
Vested LTIP units	29,989		30,949		234,330		342,940
Fair value of vested LTIP units (in thousands)	$	884	$	851	$	6,348	$	9,002

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Commitments and Contingencies

9 Months Ended

Sep. 30, 2019

Commitments and Contingencies Disclosure [Abstract]

Commitments and Contingencies

Commitments and Contingencies

The Company is subject to various legal proceedings and claims that arise in the ordinary course of business. These matters are generally covered by insurance subject to deductible requirements. Management believes that the ultimate settlement of these actions will not have a material adverse effect on the Company’s financial position, results of operations, or cash flows.

The Company has letters of credit of approximately $6.0 million as of September 30, 2019 related to construction projects and certain other agreements. As of September 30, 2019, the Company has a development commitment related to a building expansion under a tenant lease of approximately $3.1 million.

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Noncontrolling Interest - Summary (Details) - shares	9 Months Ended	12 Months Ended
	Sep. 30, 2019	Dec. 31, 2018	Dec. 31, 2017
Noncontrolling interest
Noncontrolling interest ownership percentage	2.80%	3.50%	4.10%
Noncontrolling Interest - Unit holders in Operating Partnership
Noncontrolling interest
Units outstanding, balance at beginning of period (in units)	4,069,434	4,096,687
Granted/Issued	364,173	324,802
Forfeited	10,208	0
Conversions from LTIP units to Other Common Units	0	0
Redemptions from Other Common Units to common stock	661,082	352,055
Units outstanding, balance at end of period (in units)	3,762,317	4,069,434
LTIP Units | Noncontrolling Interest - Unit holders in Operating Partnership
Noncontrolling interest
Units outstanding, balance at beginning of period (in units)	1,616,200	1,457,070
Granted/Issued	364,173	324,802
Forfeited	10,208	0
Conversions from LTIP units to Other Common Units	262,847	165,672
Redemptions from Other Common Units to common stock	0	0
Units outstanding, balance at end of period (in units)	1,707,318	1,616,200
Other Common Units | Noncontrolling Interest - Unit holders in Operating Partnership
Noncontrolling interest
Units outstanding, balance at beginning of period (in units)	2,453,234	2,639,617
Granted/Issued	0	0
Forfeited	0	0
Conversions from LTIP units to Other Common Units	(262,847)	(165,672)
Redemptions from Other Common Units to common stock	661,082	352,055
Units outstanding, balance at end of period (in units)	2,054,999	2,453,234

XML

Equity Incentive Plan - 2019 Activity (Details) - USD ($) $ in Millions			9 Months Ended	12 Months Ended
	Jan. 07, 2019	Dec. 31, 2018	Sep. 30, 2019	Dec. 31, 2018
LTIP Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted	154,649		364,173	324,802
Unrecognized compensation costs			$ 5.5
Unrecognized compensation costs, period for recognition			2 years 3 months 18 days
Restricted stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period (in years)	4 years
Stock Repurchased and Retired During Period, Shares			58,697	41,975
Granted			110,830	76,659
Unrecognized compensation costs			$ 3.4
Unrecognized compensation costs, period for recognition			2 years 6 months
Performance shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation costs			$ 7.0
Unrecognized compensation costs, period for recognition			2 years
Performance Units Granted in 2016 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period (in years)		3 years
Performance Units Granted in 2016 [Member] | LTIP Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period (in years)	1 year
Issuance of vested LTIP units and shares	102,216
Granted	107,308
Performance Units Granted in 2016 [Member] | Common Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Issuance of vested LTIP units and shares	74,032
Stock Repurchased and Retired During Period, Shares	30,193
Performance Units Granted in 2016 [Member] | Restricted stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period (in years)	1 year
Granted	22,678

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Rental Property - Acquisitions - Allocation of Consideration (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2019 USD ($)
Allocation of the consideration paid for the acquired assets and liabilities
Land	$ 63,317
Buildings	499,255
Tenant improvements	6,246
Building and land improvements	45,869
Other assets	2,513
Total purchase price	748,088
Construction in progress
Allocation of the consideration paid for the acquired assets and liabilities
Construction in progress	2,032
In-place leases
Allocation of the consideration paid for the acquired assets and liabilities
Deferred leasing intangibles	$ (76,628)
Weighted average amortization period of lease intangibles	8 years 10 months 24 days
Tenant relationships
Allocation of the consideration paid for the acquired assets and liabilities
Deferred leasing intangibles	$ (36,008)
Weighted average amortization period of lease intangibles	11 years 8 months 12 days
Above market leases
Allocation of the consideration paid for the acquired assets and liabilities
Deferred leasing intangibles	$ (19,449)
Weighted average amortization period of lease intangibles	12 years 9 months 18 days
Below market leases
Allocation of the consideration paid for the acquired assets and liabilities
Deferred leasing intangibles	$ 3,229
Weighted average amortization period of lease intangibles	6 years 10 months 24 days

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Summary of Significant Accounting Policies - Restricted Cash (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018	Sep. 30, 2018	Dec. 31, 2017
Accounting Policies [Abstract]
Cash and cash equivalents	$ 6,540	$ 7,968
Restricted cash	2,733	14,574
Cash and cash equivalents and restricted cash—end of period	$ 9,273	$ 22,542	$ 11,255	$ 28,129

XML

Subsequent Events	9 Months Ended
	Sep. 30, 2019
Subsequent Events [Abstract]
Subsequent Events	Subsequent EventsThere were no recognized or non-recognized subsequent events.

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Debt

9 Months Ended

Sep. 30, 2019

Debt Disclosure [Abstract]

Debt

Debt

The following table summarizes the Company’s outstanding indebtedness, including borrowings under the Company’s unsecured credit facility, unsecured term loans, unsecured notes, and mortgage notes as of September 30, 2019 and December 31, 2018.

Loan	Principal Outstanding as of September 30, 2019 (in thousands)		Principal Outstanding as of December 31, 2018 (in thousands)		Interest  Rate (1)(2)		Maturity Date	Prepayment Terms (3)
Unsecured credit facility:
Unsecured Credit Facility (4)	$	78,000	$	100,500	L + 0.90%		January 15, 2023	i
Total unsecured credit facility	78,000		100,500
Unsecured term loans:
Unsecured Term Loan C	150,000		150,000		2.39	%	September 29, 2020	i
Unsecured Term Loan B	150,000		150,000		3.05	%	March 21, 2021	i
Unsecured Term Loan A	150,000		150,000		2.70	%	March 31, 2022	i
Unsecured Term Loan D	150,000		150,000		2.85	%	January 4, 2023	i
Unsecured Term Loan E	175,000		—		3.92	%	January 15, 2024	i
Unsecured Term Loan F (5)	—		—		3.11	%	January 12, 2025	i
Total unsecured term loans	775,000		600,000
Less: Total unamortized deferred financing fees and debt issuance costs	(3,963)		(3,640)
Total carrying value unsecured term loans, net	771,037		596,360
Unsecured notes:
Series F Unsecured Notes	100,000		100,000		3.98	%	January 5, 2023	ii
Series A Unsecured Notes	50,000		50,000		4.98	%	October 1, 2024	ii
Series D Unsecured Notes	100,000		100,000		4.32	%	February 20, 2025	ii
Series G Unsecured Notes	75,000		75,000		4.10	%	June 13, 2025	ii
Series B Unsecured Notes	50,000		50,000		4.98	%	July 1, 2026	ii
Series C Unsecured Notes	80,000		80,000		4.42	%	December 30, 2026	ii
Series E Unsecured Notes	20,000		20,000		4.42	%	February 20, 2027	ii
Series H Unsecured Notes	100,000		100,000		4.27	%	June 13, 2028	ii
Total unsecured notes	575,000		575,000
Less: Total unamortized deferred financing fees and debt issuance costs	(2,217)		(2,512)
Total carrying value unsecured notes, net	572,783		572,488
Mortgage notes (secured debt):
Wells Fargo Bank, National Association CMBS Loan	51,861		53,216		4.31	%	December 1, 2022	iii
Thrivent Financial for Lutherans	3,709		3,795		4.78	%	December 15, 2023	iv
Total mortgage notes	55,570		57,011
Add: Total unamortized fair market value premiums	42		50
Less: Total unamortized deferred financing fees and debt issuance costs	(402)		(501)
Total carrying value mortgage notes, net	55,210		56,560
Total / weighted average interest rate (6)	$	1,477,030	$	1,325,908	3.58	%

(1)Interest rate as of September 30, 2019. At September 30, 2019, the one-month LIBOR (“L”) was 2.01563%. The current interest rate is not adjusted to include the amortization of deferred financing fees or debt issuance costs incurred in obtaining debt or any unamortized fair market value premiums. The spread over the applicable rate for the Company’s unsecured credit facility and unsecured term loans is based on the Company’s debt rating, as defined in the respective loan agreements.

(2)As of September 30, 2019, one-month LIBOR for the Unsecured Term Loans A, B, C, D, E, and F was swapped to a fixed rate of 1.70%, 2.05%, 1.39%, 1.85%, 2.92%, and 2.11%, respectively.

(3)Prepayment terms consist of (i) pre-payable with no penalty; (ii) pre-payable with penalty; (iii) pre-payable without penalty three months prior to the maturity date, however can be defeased; and (iv) pre-payable without penalty three months prior to the maturity date.

(4)The capacity of the unsecured credit facility is $500.0 million. Deferred financing fees and debt issuance costs, net of accumulated amortization related to the unsecured credit facility of approximately $2.6 million and $3.2 million is included in prepaid expenses and other assets on the accompanying Consolidated Balance Sheets as of September 30, 2019 and December 31, 2018, respectively.

(5)Capacity of $200.0 million, which the Company has until July 12, 2020 to draw.

(6)The weighted average interest rate was calculated using the fixed interest rate swapped on the notional amount of $775.0 million of debt, and is not adjusted to include the amortization of deferred financing fees or debt issuance costs incurred in obtaining debt or any unamortized fair market value premiums.

The aggregate undrawn nominal commitment on the unsecured credit facility and unsecured term loans as of September 30, 2019 was approximately $616.0 million, including issued letters of credit. The Company’s actual borrowing capacity at any given point in time may be less and is restricted to a maximum amount based on the Company’s debt covenant compliance. Total accrued interest for the Company’s indebtedness was approximately $7.6 million and $5.9 million as of September 30, 2019 and December 31, 2018, respectively, and is included in accounts payable, accrued expenses and other liabilities on the accompanying Consolidated Balance Sheets.

The following table summarizes the costs included in interest expense related to the Company’s debt arrangements on the accompanying Consolidated Statement of Operations for the three and nine months ended September 30, 2019 and 2018.

	Three months ended September 30,				Nine months ended September 30,
Costs Included in Interest Expense (in thousands)	2019		2018		2019		2018
Amortization of deferred financing fees and debt issuance costs and fair market value premiums	$	673	$	617	$	1,909	$	1,698
Facility, unused, and other fees	$	348	$	275	$	1,118	$	928

On July 25, 2019, the Company drew $175.0 million of the $175.0 million Unsecured Term Loan E that was entered into on July 26, 2018.

On July 12, 2019, the Company entered into the $200.0 million unsecured Unsecured Term Loan F. As of September 30, 2019, the interest rate on the Unsecured Term Loan F was LIBOR plus a spread of 1.00% based on the Company’s debt rating, as defined in the loan agreement. Unless otherwise terminated pursuant to the loan agreement, the Unsecured Term Loan F will mature on January 12, 2025. The Unsecured Term Loan F has a feature that allows the Company to request an increase in the aggregate size of the unsecured term loan of up to $400.0 million, subject to the satisfaction of certain conditions and lender consents. The agreement includes a delayed draw feature that allows the Company to draw up to six advances of at least $25.0 million each until July 12, 2020. To the extent that the Company does not request advances of the $200.0 million of aggregate commitments by July 12, 2020, the unadvanced commitments terminate. The Unsecured Term Loan F has an unused commitment fee equal to 0.15% of its unused commitments, which began to accrue on October 10, 2019 and is due and payable monthly until the earlier of (i) the date that aggregate commitments of $200.0 million have been fully advanced, (ii) July 12, 2020, and (iii) the date that aggregate commitments have been reduced to zero pursuant to the terms of the agreement. The Company is required to pay an annual administrative agent fee of $35,000. The Company and certain wholly owned subsidiaries of the Operating Partnership are guarantors of the Unsecured Term Loan F. The agreement also contains financial and other covenants substantially similar to the covenants in the Company's unsecured credit facility. As of September 30, 2019, no amounts were outstanding under the Unsecured Term Loan F.

Financial Covenant Considerations

The Company was in compliance with all financial and other covenants as of September 30, 2019 and December 31, 2018 related to its unsecured credit facility, unsecured term loans, unsecured notes, and mortgage notes. The real estate net book value of the properties that are collateral for the Company’s debt arrangements was approximately $86.0 million and $88.2 million at September 30, 2019 and December 31, 2018, respectively, and is limited to senior, property-level secured debt financing arrangements.

Fair Value of Debt

The following table summarizes the aggregate principal outstanding under the Company’s debt arrangements and the corresponding estimate of fair value as of September 30, 2019 and December 31, 2018.

	September 30, 2019				December 31, 2018
Indebtedness (in thousands)	Principal Outstanding		Fair Value		Principal Outstanding		Fair Value
Unsecured credit facility	$	78,000	$	78,000	$	100,500	$	100,500
Unsecured term loans	775,000		775,000		600,000		600,000
Unsecured notes	575,000		618,594		575,000		585,292
Mortgage notes	55,570		56,627		57,011		57,289
Total principal amount	1,483,570		$	1,528,221	1,332,511		$	1,343,081
Add: Total unamortized fair market value premiums	42				50
Less: Total unamortized deferred financing fees and debt issuance costs	(6,582)				(6,653)
Total carrying value	$	1,477,030			$	1,325,908

The applicable fair value guidance establishes a three tier value hierarchy, which prioritizes the inputs used in measuring fair value. These tiers include: Level 1, defined as observable inputs such as quoted prices in active markets; Level 2, defined as inputs other than quoted prices in active markets that are either directly or indirectly observable; and Level 3, defined as unobservable inputs in which little or no market data exists, therefore requiring an entity to develop its own assumptions. The fair value of the Company’s debt is based on Level 3 inputs.

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Equity Incentive Plan

9 Months Ended

Sep. 30, 2019

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

Equity Incentive Plan

Equity Incentive PlanOn January 7, 2019, the Company granted performance units approved by the compensation committee of the board of directors under the 2011 Plan to certain key employees of the Company. The terms of the performance units granted on January 7, 2019 are substantially the same as the terms of the performance units granted on January 5, 2018 and January 6, 2017, except that the measuring period commences on January 1, 2019 and ends on December 31, 2021, and the award shares are immediately vested at the end of the measuring period.

The fair value of the performance units at the date of grant was determined by a lattice-binomial option-pricing model based on a Monte Carlo simulation. The fair value of the performance units are based on Level 3 inputs and are non-recurring fair value measurements. The performance unit equity compensation expense is recognized ratably from the grant date into earnings over the vesting period. The following table summarizes the assumptions used in valuing the performance units granted during the nine months ended September 30, 2019.

Performance Units	Assumptions
Grant date	January 7, 2019
Expected volatility	20.7		%
Expected dividend yield	6.0		%
Risk-free interest rate	2.56		%
Fair value of performance units grant (in thousands)	$	5,620

On December 31, 2018, the Company’s three year measurement period pursuant to the March 8, 2016 performance units concluded. It was determined that the Company’s total stockholder return exceeded the threshold percentage and return hurdle. The compensation committee of the board of directors approved the issuance of 102,216 vested LTIP units and 74,032 vested shares of common stock (of which 30,193 shares of common stock were repurchased and retired) to the participants, which were issued on January 7, 2019. The compensation committee of the board of directors also approved the issuance of 107,308 LTIP units and 22,678 restricted shares of common stock that will vest on December 31, 2019, which were issued on January 7, 2019.

The unrecognized compensation expense associated with the Company’s performance units at September 30, 2019 was approximately $7.0 million and is expected to be recognized over a weighted average period of approximately 2.0 years.

Non-cash Compensation Expense

The following table summarizes the amount recorded in general and administrative expenses in the accompanying Consolidated Statements of Operations for the amortization of restricted shares of common stock, LTIP units, performance units, and the Company’s director compensation for the three and nine months ended September 30, 2019 and 2018.

	Three months ended September 30,				Nine months ended September 30,
Non-Cash Compensation Expense (in thousands)	2019		2018		2019		2018
Restricted shares of common stock	$	447	$	406	$	1,318	$	1,269
LTIP units	901		893		2,687		2,654
Performance units	1,107		838		3,062		2,463
Director compensation (1)	101		99		304		285
Total non-cash compensation expense	$	2,556	$	2,236	$	7,371	$	6,671

(1)All of the Company’s independent directors elected to receive shares of common stock in lieu of cash for their service during the three and nine months ended September 30, 2019 and 2018. The number of shares of common stock granted is calculated based on the trailing 10 days average common stock price ending on the third business day preceding the grant date.

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Noncontrolling Interest - LTIP FV Assumptions (Details) - LTIP Units - USD ($) $ / shares in Units, $ in Thousands		9 Months Ended	12 Months Ended
	Jan. 07, 2019	Sep. 30, 2019	Dec. 31, 2018
Assumptions
Expected term (years)	10 years
Expected volatility	19.00%
Expected dividend yield	6.00%
Risk-free interest rate	2.57%
Fair value of LTIP units at issuance (in thousands)	$ 3,636
Granted (in shares)	154,649	364,173	324,802
Fair value of restricted stock per share at grant date	$ 23.51
Share-based Compensation Award, Tranche One [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period (in years)	4 years
Independent Director | Share-based Compensation Award, Tranche One [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period (in years)	1 year

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Equity Incentive Plan - Equity Non-cash Compensation Expense (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
General and Administrative Expenses
Equity Incentive Plan
Share-based compensation	$ 2,556	$ 2,236	$ 7,371	$ 6,671
Restricted stock | General and Administrative Expenses
Equity Incentive Plan
Share-based compensation	447	406	1,318	1,269
LTIP Units | General and Administrative Expenses
Equity Incentive Plan
Share-based compensation	901	893	2,687	2,654
Performance shares | General and Administrative Expenses
Equity Incentive Plan
Share-based compensation	1,107	838	3,062	2,463
Independent Director | General and Administrative Expenses
Equity Incentive Plan
Share-based compensation	$ 101	$ 99	$ 304	$ 285
Common Stock | Independent Director
Equity Incentive Plan
Number of days of average trailing stock price used to calculate number of shares of common stock granted			10 days	10 days

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Leases - Lessee Leases (Details) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2019 USD ($) Rate	Sep. 30, 2019 USD ($) Rate
Lessee, Lease, Description [Line Items]
Operating Lease, Weighted Average Remaining Lease Term	35 years 8 months 12 days	35 years 8 months 12 days
Operating Lease, Weighted Average Discount Rate, Percent | Rate	7.10%	7.10%
Lease, Cost	$ 597	$ 1,792
Operating Lease, Payments		$ 1,711
Minimum [Member]
Lessee, Lease, Description [Line Items]
Lessee, Operating Lease, Term of Contract	1 year 6 months	1 year 6 months
Lessee, Operating Lease, Renewal Term	10 years	10 years
Maximum [Member]
Lessee, Lease, Description [Line Items]
Lessee, Operating Lease, Term of Contract	47 years 3 months 18 days	47 years 3 months 18 days
Lessee, Operating Lease, Renewal Term	20 years	20 years
Operating Expense [Member]
Lessee, Lease, Description [Line Items]
Lease, Cost	$ 331	$ 993
General and Administrative Expenses
Lessee, Lease, Description [Line Items]
Lease, Cost	$ 266	$ 799

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Commitments and Contingencies - Agreements (Details) $ in Millions	Sep. 30, 2019 USD ($)
Commitments and Contingencies Disclosure [Abstract]
Letters of credit outstanding	$ 6.0
Contractual Obligation	$ 3.1

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Derivative Financial Instruments - Cash Flow Hedges and Contingent Features (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Cash Flow Hedges of Interest Rate Risk
Total interest expense presented in the Consolidated Statements of Operations in which the effects of cash flow hedges are recorded	$ 14,053,000	$ 12,698,000	$ 39,080,000	$ 35,602,000
Interest Rate Swaps
Cash Flow Hedges of Interest Rate Risk
Additional amount reclassified from accumulated other comprehensive income (loss) as a increase (decrease) to interest expense over the next twelve months	3,800,000		3,800,000
Income (loss) recognized in accumulated other comprehensive income (loss) on interest rate swaps	(5,913,000)	2,572,000	(26,715,000)	13,349,000
Income reclassified from accumulated other comprehensive income (loss) into income as interest expense	522,000	512,000	2,726,000	538,000
Total interest expense presented in the Consolidated Statements of Operations in which the effects of cash flow hedges are recorded	14,053,000	$ 12,698,000	39,080,000	$ 35,602,000
Assets Needed for Immediate Settlement, Aggregate Fair Value	$ 24,600,000		$ 24,600,000

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Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018
Cash flows from operating activities:
Net income	$ 32,749	$ 48,989
Adjustment to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	133,844	125,221
Loss on impairments	9,757	2,934
Non-cash portion of interest expense	1,909	1,698
Amortization of above and below market leases, net	3,344	3,206
Straight-line rent adjustments, net	(8,586)	(8,297)
Dividends on forfeited equity compensation	7	15
Loss on extinguishment of debt	0	(13)
Gain on the sales of rental property, net	(3,261)	(32,276)
Non-cash compensation expense	7,371	6,671
Change in assets and liabilities:
Tenant accounts receivable	509	501
Prepaid expenses and other assets	(10,525)	(9,597)
Accounts payable, accrued expenses and other liabilities	8,834	9,249
Tenant prepaid rent and security deposits	(1,022)	283
Total adjustments	142,181	99,621
Net cash provided by operating activities	174,930	148,610
Cash flows from investing activities:
Acquisitions of land and buildings and improvements	(616,647)	(382,981)
Additions of land and building and improvements	(40,193)	(23,578)
Acquisitions of other assets	2,513	794
Acquisitions of other liabilities	0	(242)
Proceeds from sales of rental property, net	23,700	89,407
Acquisition deposits, net	(1,190)	(695)
Acquisitions of deferred leasing intangibles	(128,832)	(74,851)
Net cash used in investing activities	(765,675)	(393,250)
Cash flows from financing activities:
Proceeds from unsecured credit facility	768,000	643,000
Repayment of unsecured credit facility	(790,500)	(819,000)
Proceeds from unsecured term loans	175,000	150,000
Proceeds from unsecured notes	0	175,000
Repayment of mortgage notes	(1,441)	(1,379)
Payment of loan fees and costs	(1,226)	(4,451)
Proceeds from sales of common stock, net	568,390	273,266
Redemption of preferred stock	0	70,000
Dividends and distributions	139,303	117,146
Repurchase and retirement of share-based compensation	(1,444)	(1,524)
Net cash provided by financing activities	577,476	227,766
Decrease in cash and cash equivalents and restricted cash	(13,269)	(16,874)
Cash and cash equivalents and restricted cash—beginning of period	22,542	28,129
Cash and cash equivalents and restricted cash—end of period	9,273	11,255
Supplemental disclosure:
Cash paid for interest, net of capitalized interest	35,372	31,875
Supplemental schedule of non-cash investing and financing activities
Acquisitions of land and buildings and improvements	72	232
Acquisitions of deferred leasing intangibles	24	48
Change in additions of land, building, and improvements included in accounts payable, accrued expenses, and other liabilities	(10,824)	(1,475)
Additions to building and other capital improvements from non-cash compensation	(59)	(20)
Change in loan fees, costs, and offering costs included in accounts payable, accrued expenses, and other liabilities	(314)	48
Reclassification of preferred stock called for redemption to liability	0	70,000
Leases cumulative effect adjustment	(214)	0
Dividends and distributions payable	$ 16,293	$ 14,530

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Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Building and Improvements	$ 367,088	$ 316,930
Deferred leasing intangibles assets, accumulated amortization	241,323	246,502
Deferred leasing intangibles liabilities, accumulated amortization	$ 11,259	$ 12,764
Preferred stock, par value (in dollars per share)	$ 0.01	$ 0.01
Preferred stock, shares authorized	20,000,000	15,000,000
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized	300,000,000	150,000,000
Common Stock, shares, issued	132,958,388	112,165,786
Common stock, shares outstanding	132,958,388	112,165,786
Series C Preferred Stock
Preferred stock, shares issued	3,000,000	3,000,000
Preferred stock, shares outstanding	3,000,000	3,000,000
Preferred stock, liquidation preference (in dollars per share)	$ 25.00	$ 25.00

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Debt - 2019 Activity (Details) - USD ($)			3 Months Ended		9 Months Ended
	Jul. 25, 2019	Jul. 12, 2019	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018
Debt Instrument [Line Items]
Debt Instrument, Unused Borrowing Capacity, Amount			$ 616,000,000.0		$ 616,000,000.0
Long-term debt, gross			1,483,570,000		1,483,570,000		$ 1,332,511,000
Net book value of properties that are collateral for debt arrangements			86,000,000.0		86,000,000.0		88,200,000
Unsecured Term Loans
Debt Instrument [Line Items]
Long-term debt, gross			775,000,000		775,000,000		600,000,000
Unsecured Notes
Debt Instrument [Line Items]
Long-term debt, gross			575,000,000		575,000,000		575,000,000
Mortgage Loans Payable
Debt Instrument [Line Items]
Long-term debt, gross			55,570,000		55,570,000		57,011,000
Accounts Payable and Accrued Liabilities [Member]
Debt Instrument [Line Items]
Interest payable			7,600,000		7,600,000		5,900,000
Interest Expense [Member]
Debt Instrument [Line Items]
Amortization of deferred financing fees			673,000	$ 617,000	1,909,000	$ 1,698,000
Line of Credit Facility, Commitment Fee Amount			348,000	$ 275,000	1,118,000	$ 928,000
$175 Million Unsecured Term Loan E [Member]
Debt Instrument [Line Items]
Proceeds from Issuance of Debt	$ 175,000,000.0
$175 Million Unsecured Term Loan E [Member] | Unsecured Term Loans
Debt Instrument [Line Items]
Long-term debt, gross			175,000,000		175,000,000		0
$200 Million Unsecured Term Loan F [Member]
Debt Instrument [Line Items]
Long-term debt, gross		$ 200,000,000.0	200,000,000.0		200,000,000.0
Line of Credit Facility, Accordion Feature, Increase Limit		$ 400,000,000.0
Debt Instrument, Accordion Feature, Number of Advances, Maximum		6
Debt Instrument, Accordion Feature, Increase Limit, Minimum Advance		$ 25,000,000.0
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage		0.15%
Debt Instrument, Fee Amount		$ 35,000
$200 Million Unsecured Term Loan F [Member] | Unsecured Term Loans
Debt Instrument [Line Items]
Long-term debt, gross			$ 0		$ 0		$ 0
London Interbank Offered Rate (LIBOR) [Member] | Unsecured Credit Facility
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate					0.90%
London Interbank Offered Rate (LIBOR) [Member] | $200 Million Unsecured Term Loan F [Member]
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate					1.00%

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Debt (Tables)

9 Months Ended

Sep. 30, 2019

Debt Disclosure [Abstract]

Summary of the mortgage notes payable, unsecured term loans and credit facility

The following table summarizes the Company’s outstanding indebtedness, including borrowings under the Company’s unsecured credit facility, unsecured term loans, unsecured notes, and mortgage notes as of September 30, 2019 and December 31, 2018.

Loan	Principal Outstanding as of September 30, 2019 (in thousands)		Principal Outstanding as of December 31, 2018 (in thousands)		Interest  Rate (1)(2)		Maturity Date	Prepayment Terms (3)
Unsecured credit facility:
Unsecured Credit Facility (4)	$	78,000	$	100,500	L + 0.90%		January 15, 2023	i
Total unsecured credit facility	78,000		100,500
Unsecured term loans:
Unsecured Term Loan C	150,000		150,000		2.39	%	September 29, 2020	i
Unsecured Term Loan B	150,000		150,000		3.05	%	March 21, 2021	i
Unsecured Term Loan A	150,000		150,000		2.70	%	March 31, 2022	i
Unsecured Term Loan D	150,000		150,000		2.85	%	January 4, 2023	i
Unsecured Term Loan E	175,000		—		3.92	%	January 15, 2024	i
Unsecured Term Loan F (5)	—		—		3.11	%	January 12, 2025	i
Total unsecured term loans	775,000		600,000
Less: Total unamortized deferred financing fees and debt issuance costs	(3,963)		(3,640)
Total carrying value unsecured term loans, net	771,037		596,360
Unsecured notes:
Series F Unsecured Notes	100,000		100,000		3.98	%	January 5, 2023	ii
Series A Unsecured Notes	50,000		50,000		4.98	%	October 1, 2024	ii
Series D Unsecured Notes	100,000		100,000		4.32	%	February 20, 2025	ii
Series G Unsecured Notes	75,000		75,000		4.10	%	June 13, 2025	ii
Series B Unsecured Notes	50,000		50,000		4.98	%	July 1, 2026	ii
Series C Unsecured Notes	80,000		80,000		4.42	%	December 30, 2026	ii
Series E Unsecured Notes	20,000		20,000		4.42	%	February 20, 2027	ii
Series H Unsecured Notes	100,000		100,000		4.27	%	June 13, 2028	ii
Total unsecured notes	575,000		575,000
Less: Total unamortized deferred financing fees and debt issuance costs	(2,217)		(2,512)
Total carrying value unsecured notes, net	572,783		572,488
Mortgage notes (secured debt):
Wells Fargo Bank, National Association CMBS Loan	51,861		53,216		4.31	%	December 1, 2022	iii
Thrivent Financial for Lutherans	3,709		3,795		4.78	%	December 15, 2023	iv
Total mortgage notes	55,570		57,011
Add: Total unamortized fair market value premiums	42		50
Less: Total unamortized deferred financing fees and debt issuance costs	(402)		(501)
Total carrying value mortgage notes, net	55,210		56,560
Total / weighted average interest rate (6)	$	1,477,030	$	1,325,908	3.58	%

(1)Interest rate as of September 30, 2019. At September 30, 2019, the one-month LIBOR (“L”) was 2.01563%. The current interest rate is not adjusted to include the amortization of deferred financing fees or debt issuance costs incurred in obtaining debt or any unamortized fair market value premiums. The spread over the applicable rate for the Company’s unsecured credit facility and unsecured term loans is based on the Company’s debt rating, as defined in the respective loan agreements.

(2)As of September 30, 2019, one-month LIBOR for the Unsecured Term Loans A, B, C, D, E, and F was swapped to a fixed rate of 1.70%, 2.05%, 1.39%, 1.85%, 2.92%, and 2.11%, respectively.

(3)Prepayment terms consist of (i) pre-payable with no penalty; (ii) pre-payable with penalty; (iii) pre-payable without penalty three months prior to the maturity date, however can be defeased; and (iv) pre-payable without penalty three months prior to the maturity date.

(4)The capacity of the unsecured credit facility is $500.0 million. Deferred financing fees and debt issuance costs, net of accumulated amortization related to the unsecured credit facility of approximately $2.6 million and $3.2 million is included in prepaid expenses and other assets on the accompanying Consolidated Balance Sheets as of September 30, 2019 and December 31, 2018, respectively.

(5)Capacity of $200.0 million, which the Company has until July 12, 2020 to draw.

(6)The weighted average interest rate was calculated using the fixed interest rate swapped on the notional amount of $775.0 million of debt, and is not adjusted to include the amortization of deferred financing fees or debt issuance costs incurred in obtaining debt or any unamortized fair market value premiums.

Interest Income and Interest Expense Disclosure [Table Text Block]

The following table summarizes the costs included in interest expense related to the Company’s debt arrangements on the accompanying Consolidated Statement of Operations for the three and nine months ended September 30, 2019 and 2018.

	Three months ended September 30,				Nine months ended September 30,
Costs Included in Interest Expense (in thousands)	2019		2018		2019		2018
Amortization of deferred financing fees and debt issuance costs and fair market value premiums	$	673	$	617	$	1,909	$	1,698
Facility, unused, and other fees	$	348	$	275	$	1,118	$	928

Schedule of aggregate carrying value of the debt and the corresponding estimate of fair value

The following table summarizes the aggregate principal outstanding under the Company’s debt arrangements and the corresponding estimate of fair value as of September 30, 2019 and December 31, 2018.

	September 30, 2019				December 31, 2018
Indebtedness (in thousands)	Principal Outstanding		Fair Value		Principal Outstanding		Fair Value
Unsecured credit facility	$	78,000	$	78,000	$	100,500	$	100,500
Unsecured term loans	775,000		775,000		600,000		600,000
Unsecured notes	575,000		618,594		575,000		585,292
Mortgage notes	55,570		56,627		57,011		57,289
Total principal amount	1,483,570		$	1,528,221	1,332,511		$	1,343,081
Add: Total unamortized fair market value premiums	42				50
Less: Total unamortized deferred financing fees and debt issuance costs	(6,582)				(6,653)
Total carrying value	$	1,477,030			$	1,325,908

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Equity Incentive Plan (Tables)

9 Months Ended

Sep. 30, 2019

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

Schedule of share-based payment award, performance unit awards, valuation assumptions

The following table summarizes the assumptions used in valuing the performance units granted during the nine months ended September 30, 2019.

Performance Units	Assumptions
Grant date	January 7, 2019
Expected volatility	20.7		%
Expected dividend yield	6.0		%
Risk-free interest rate	2.56		%
Fair value of performance units grant (in thousands)	$	5,620

Summary of Equity Compensation Expense

The following table summarizes the amount recorded in general and administrative expenses in the accompanying Consolidated Statements of Operations for the amortization of restricted shares of common stock, LTIP units, performance units, and the Company’s director compensation for the three and nine months ended September 30, 2019 and 2018.

	Three months ended September 30,				Nine months ended September 30,
Non-Cash Compensation Expense (in thousands)	2019		2018		2019		2018
Restricted shares of common stock	$	447	$	406	$	1,318	$	1,269
LTIP units	901		893		2,687		2,654
Performance units	1,107		838		3,062		2,463
Director compensation (1)	101		99		304		285
Total non-cash compensation expense	$	2,556	$	2,236	$	7,371	$	6,671

(1)All of the Company’s independent directors elected to receive shares of common stock in lieu of cash for their service during the three and nine months ended September 30, 2019 and 2018. The number of shares of common stock granted is calculated based on the trailing 10 days average common stock price ending on the third business day preceding the grant date.

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Equity

9 Months Ended

Sep. 30, 2019

Stockholders' Equity Note [Abstract]

Equity

Equity

Preferred Stock

On April 30, 2019, the Company filed Articles of Amendment to its Articles of Amendment and Restatement to increase the number of authorized shares of preferred stock from 15,000,000 to 20,000,000.

The following table summarizes the Company’s outstanding preferred stock issuances as of September 30, 2019.

Preferred Stock Issuances	Issuance Date	Number of Shares	Liquidation Value Per Share		Interest Rate
6.875% Series C Cumulative Redeemable Preferred Stock ("Series C Preferred Stock")	March 17, 2016	3,000,000	$	25.00	6.875	%

The following tables summarize the dividends attributable to the Company’s outstanding preferred stock issuances during the nine months ended September 30, 2019 and the year ended December 31, 2018.

Quarter Ended 2019	Declaration Date	Series C Preferred Stock Per Share		Payment Date
September 30	July 15, 2019	$	0.4296875	September 30, 2019
June 30	April 9, 2019	0.4296875		July 1, 2019
March 31	January 10, 2019	0.4296875		April 1, 2019
Total		$	1.2890625

Quarter Ended 2018	Declaration Date	Series B Preferred Stock Per Share			Series C Preferred Stock Per Share		Payment Date
December 31	October 10, 2018	$	—		$	0.4296875	December 31, 2018
September 30	July 11, 2018	0.0460069		(1)	0.4296875		October 1, 2018
June 30	April 10, 2018	0.4140625			0.4296875		July 2, 2018
March 31	February 14, 2018	0.4140625			0.4296875		April 2, 2018
Total		$	0.8741319		$	1.7187500

(1)On June 11, 2018, the Company gave notice to redeem all 2,800,000 issued and outstanding shares of the 6.625% Series B Cumulative Redeemable Preferred Stock (“Series B Preferred Stock”). On July 11, 2018, the Company redeemed all of the Series B Preferred Stock at a cash redemption price of $25.00 per share, plus accrued and unpaid dividends to but excluding the redemption date, without interest.

On October 15, 2019, the Company’s board of directors declared the Series C Preferred Stock dividends for the quarter ending December 31, 2019 at a quarterly rate of $0.4296875 per share.

Common Stock

On April 30, 2019, the Company filed Articles of Amendment to its Articles of Amendment and Restatement to increase the number of authorized shares of the Company’s common stock from 150,000,000 to 300,000,000.

The following table summarizes the terms of the Company’s at-the market (“ATM”) common stock offering program as of September 30, 2019.

ATM Common Stock Offering Program	Date	Maximum Aggregate Offering Price (in thousands)		Aggregate Common Stock Available as of September 30, 2019 (in thousands)
2019 $600 million ATM	February 14, 2019	$	600,000	$	401,137

The following tables summarize the activity under the ATM common stock offering programs during the nine months ended September 30, 2019 and year ended December 31, 2018 (in thousands, except share data).

	Nine months ended September 30, 2019
ATM Common Stock Offering Program	Shares Sold	Weighted Average Price Per Share		Net Proceeds
2019 $600 million ATM	7,022,332	$	28.32	$	197,074
Total/weighted average	7,022,332	$	28.32	$	197,074

	Year ended December 31, 2018
ATM Common Stock Offering Program	Shares Sold	Weighted Average Price Per Share		Net Proceeds
2017 $500 million ATM (1)	14,724,614	$	26.52	$	386,407
Total/weighted average	14,724,614	$	26.52	$	386,407

(1) This program ended in February 2019.

On September 24, 2019, the Company completed an underwritten public offering of an aggregate 12,650,000 shares of common stock at a price to the underwriters of $28.60 per share, consisting of (i) 5,500,000 shares offered directly by the Company and (ii) 7,150,000 shares offered by the forward dealer in connection with certain forward sale agreements (including 1,650,000 shares offered pursuant to the underwriters’ option to purchase additional shares, which option was exercised in full). The offering closed on September 27, 2019 and the Company received net proceeds from the sale of shares offered directly by the Company of $157.3 million. Subject to the Company's right to elect cash or net share settlement, the Company has the ability to settle the forward sales agreements at any time through scheduled maturity date of the forward sale agreements of September 24, 2020.

On April 1, 2019, the Company completed an underwritten public offering of 7,475,000 shares of common stock (including 975,000 shares issued pursuant to the underwriters’ option to purchase additional shares, which option was exercised in full) at a price to the underwriters of $28.72 per share. The offering closed on April 4, 2019 and the Company received net proceeds of approximately $214.7 million.

The following tables summarize the dividends attributable to the Company’s outstanding shares of common stock that were declared during the nine months ended September 30, 2019 and the year ended December 31, 2018.

Month Ended 2019	Declaration Date	Record Date	Per Share		Payment Date
September 30	July 15, 2019	September 30, 2019	$	0.119167	October 15, 2019
August 31	July 15, 2019	August 30, 2019	0.119167		September 16, 2019
July 31	July 15, 2019	July 31, 2019	0.119167		August 15, 2019
June 30	April 9, 2019	June 28, 2019	0.119167		July 15, 2019
May 31	April 9, 2019	May 31, 2019	0.119167		June 17, 2019
April 30	April 9, 2019	April 30, 2019	0.119167		May 15, 2019
March 31	January 10, 2019	March 29, 2019	0.119167		April 15, 2019
February 28	January 10, 2019	February 28, 2019	0.119167		March 15, 2019
January 31	January 10, 2019	January 31, 2019	0.119167		February 15, 2019
Total			$	1.072503

Month Ended 2018	Declaration Date	Record Date	Per Share		Payment Date
December 31	October 10, 2018	December 31, 2018	$	0.118333	January 15, 2019
November 30	October 10, 2018	November 30, 2018	0.118333		December 17, 2018
October 31	October 10, 2018	October 31, 2018	0.118333		November 15, 2018
September 30	July 11, 2018	September 28, 2018	0.118333		October 15, 2018
August 31	July 11, 2018	August 31, 2018	0.118333		September 17, 2018
July 31	July 11, 2018	July 31, 2018	0.118333		August 15, 2018
June 30	April 10, 2018	June 29, 2018	0.118333		July 16, 2018
May 31	April 10, 2018	May 31, 2018	0.118333		June 15, 2018
April 30	April 10, 2018	April 30, 2018	0.118333		May 15, 2018
March 31	November 2, 2017	March 29, 2018	0.118333		April 16, 2018
February 28	November 2, 2017	February 28, 2018	0.118333		March 15, 2018
January 31	November 2, 2017	January 31, 2018	0.118333		February 15, 2018
Total			$	1.419996

On October 15, 2019, the Company’s board of directors declared the common stock dividends for the months ending October 31, 2019, November 30, 2019, and December 31, 2019 at a monthly rate of $0.119167 per share of common stock.

Restricted Shares of Common Stock

Restricted shares of common stock granted on January 7, 2019 to certain employees of the Company, subject to the recipient’s continued employment, will vest in four equal installments on January 1 of each year beginning in 2020. Refer to Note 8 for a discussion of the restricted shares of common stock granted on January 7, 2019 pursuant to the March 8, 2016 performance units. The following table summarizes activity related to the Company’s unvested restricted shares of common stock for the nine months ended September 30, 2019 and the year ended December 31, 2018.

Unvested Restricted Shares of Common Stock	Shares
Balance at December 31, 2017	237,207
Granted	76,659	(1)
Vested	(112,405)	(2)
Forfeited	(10,999)
Balance at December 31, 2018	190,462
Granted	110,830	(1)
Vested	(78,431)	(2)
Forfeited	(2,589)
Balance at September 30, 2019	220,272

(1)The fair value per share on the grant date of January 7, 2019 and January 5, 2018 was $24.85 and $26.40, respectively.

(2)The Company repurchased and retired 58,697 and 41,975 restricted shares of common stock that vested during the nine months ended September 30, 2019 and the year ended December 31, 2018, respectively.

The unrecognized compensation expense associated with the Company’s restricted shares of common stock at September 30, 2019 was approximately $3.4 million and is expected to be recognized over a weighted average period of approximately 2.5 years.

The following table summarizes the fair value at vesting for the restricted shares of common stock that vested during the three and nine months ended September 30, 2019 and 2018.

	Three months ended September 30,				Nine months ended September 30,
Vested Restricted Shares of Common Stock	2019		2018		2019		2018
Vested restricted shares of common stock	—		—		78,431		112,405
Fair value of vested restricted shares of common stock (in thousands)	$	—	$	—	$	1,951	$	3,002

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Earnings Per Share

9 Months Ended

Sep. 30, 2019

Earnings Per Share [Abstract]

Earnings Per Share

Earnings Per Share

During the three and nine months ended September 30, 2019 and 2018, there were 220,284, 218,231, 193,117 and 196,871, respectively, of unvested restricted shares of common stock on a weighted average basis that were considered participating securities.

The following table reconciles the numerators and denominators in the computation of basic and diluted earnings per common share for the three and nine months ended September 30, 2019 and 2018.

	Three months ended September 30,				Nine months ended September 30,
Earnings Per Share (in thousands, except per share data)	2019		2018		2019		2018
Numerator
Net income attributable to common stockholders	$	9,533	$	7,237	$	27,734	$	38,215
Denominator
Weighted average common shares outstanding — basic	127,272		105,783		122,460		101,095
Effect of dilutive securities(1)
Share-based compensation	178		550		254		400
Shares issuable under forward sales agreements	19		—		6		—
Weighted average common shares outstanding — diluted	127,469		106,333		122,720		101,495
Net income per share — basic and diluted
Net income per share attributable to common stockholders — basic	$	0.07	$	0.07	$	0.23	$	0.38
Net income per share attributable to common stockholders — diluted	$	0.07	$	0.07	$	0.23	$	0.38

(1)During the three and nine months ended September 30, 2019 and 2018, there were 220, 218, 193 and 197, unvested shares of restricted common stock, respectively, on a weighted average basis that were not included in the computation of diluted earnings per share because the allocation of income under the two-class method was more dilutive.

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Rental Property - Disposals (Details) ft² in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019 USD ($) ft² building	Sep. 30, 2018 USD ($)	Sep. 30, 2019 USD ($) ft² building	Sep. 30, 2018 USD ($)	Dec. 31, 2018 USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of buildings disposed | building	430		430
Area (in square feet) | ft²	86.0		86.0
Carrying value of property sold	$ 3,622,936,000		$ 3,622,936,000		$ 2,991,701,000
Disposal Group, Disposed of by Sale, Not Discontinued Operations
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of buildings disposed | building	6		6
Area (in square feet) | ft²	1.1		1.1
Carrying value of property sold	$ 20,400,000		$ 20,400,000
Contribution to revenue	20,000	$ 1,500,000	800,000	$ 5,300,000
Disposal Group, Including Discontinued Operation, Operating Income (Loss)	$ (100,000)	$ 500,000	(200,000)	$ 900,000
Net proceeds from sales of rental property			23,700,000
Gain (Loss) on Sale			$ 3,300,000
Land [Member] | Disposal Group, Disposed of by Sale, Not Discontinued Operations
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of buildings disposed | building	2		2

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Rental Property - Summary (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Property Subject to or Available for Operating Lease [Line Items]
Rental property, net	$ 3,622,936	$ 2,991,701
Deferred leasing intangibles assets, accumulated amortization	241,323	246,502
Land
Property Subject to or Available for Operating Lease [Line Items]
Rental property, net	420,215	364,023
Buildings, net of accumulated depreciation of $227,359 and $199,497, respectively
Property Subject to or Available for Operating Lease [Line Items]
Rental property, net	2,520,684	2,082,781
Rental property, accumulated depreciation	240,968	199,497
Tenant improvements, net of accumulated depreciation of $20,796 and $36,450, respectively
Property Subject to or Available for Operating Lease [Line Items]
Rental property, net	33,829	30,704
Rental property, accumulated depreciation	20,979	36,450
Building and land improvements, net of accumulated depreciation of $96,442 and $80,983, respectively
Property Subject to or Available for Operating Lease [Line Items]
Rental property, net	210,558	168,229
Rental property, accumulated depreciation	105,141	80,983
Construction in progress
Property Subject to or Available for Operating Lease [Line Items]
Rental property, net	23,695	3,949
Deferred leasing intangibles, net of accumulated amortization of $229,864 and $246,502, respectively
Property Subject to or Available for Operating Lease [Line Items]
Rental property, net	$ 413,955	$ 342,015

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Organization and Description of Business (Details) ft² in Millions	9 Months Ended	12 Months Ended
	Sep. 30, 2019 ft² state building	Dec. 31, 2018
Real Estate Properties [Line Items]
Ownership interest in Operating Partnership (as a percent)	97.20%	96.50%
Number of properties	430
Number of states in which the entity owned buildings | state	37
Area (in square feet) | ft²	86.0
Warehouse - Distribution buildings
Real Estate Properties [Line Items]
Number of properties	356
Light Manufacturing buildings
Real Estate Properties [Line Items]
Number of properties	66
Flex/Office Buildings
Real Estate Properties [Line Items]
Number of properties	8

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Equity - Restricted Stock (Details) - Restricted stock - USD ($) $ / shares in Units, $ in Thousands			3 Months Ended		9 Months Ended		12 Months Ended
	Jan. 07, 2019	Jan. 05, 2018	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period (in years)	4 years
Shares
Unvested at beginning of period (in shares)					190,462	237,207	237,207
Granted (in shares)					110,830		76,659
Vested (in shares)			0	0	(78,431)	(112,405)	(112,405)
Forfeited (in shares)					(2,589)		(10,999)
Unvested at end of period (in shares)			220,272		220,272		190,462
Fair value of restricted stock per share at grant date	$ 24.85	$ 26.40
Stock Repurchased and Retired During Period, Shares					58,697		41,975
Unrecognized compensation costs			$ 3,400		$ 3,400
Unrecognized compensation costs, period for recognition					2 years 6 months
Vested (in shares)			0	0	(78,431)	(112,405)	(112,405)
Fair value of shares vested			$ 0	$ 0	$ 1,951	$ 3,002

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Equity Incentive Plan - Performance Plan Assumptions (Details) - Performance shares $ in Thousands	Jan. 07, 2019 USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected volatility	20.70%
Expected dividend yield	6.00%
Risk-free interest rate	2.56%
Fair value of performance units grant (in thousands)	$ 5,620

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Leases - Tenant Accounts Receivable (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items]
Lease Security Deposits Available in Letters of Credit	$ 20.5		$ 20.5		$ 18.3
Lease security deposits in restricted cash	0.7		0.7		0.7
Lease security deposits included in tenant prepaid rent and security deposits on the Balance Sheet	9.2		9.2		8.4
Real Estate Taxes, Tenant Responsibility	5.1	$ 3.8	13.1	$ 10.9
Accrued Income Receivable [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Deferred Rent Receivables, Net	$ 40.2		$ 40.2		32.4
Allowance for Doubtful Accounts Receivable					$ 0.8

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Summary of Significant Accounting Policies

9 Months Ended

Sep. 30, 2019

Accounting Policies [Abstract]

Summary of Significant Accounting Policies

Summary of Significant Accounting Policies

Interim Financial Information

The accompanying interim financial statements have been presented in conformity with accounting principles generally accepted in the United States of America (“GAAP”) and with the instructions to Form 10-Q and Regulation S-X for interim financial information. Accordingly, these statements do not include all of the information and notes required by GAAP for complete financial statements. In the opinion of management, the accompanying interim financial statements include all adjustments, consisting of normal recurring items, necessary for their fair statement in conformity with GAAP. Interim results are not necessarily indicative of results for a full year. The year-end consolidated balance sheet data was derived from audited financial statements, but does not include all disclosures required by GAAP. The information included in this Quarterly Report on Form 10-Q should be read in conjunction with the Company’s consolidated financial statements and notes thereto contained in the Company’s Annual Report on Form 10-K for the fiscal year ended December 31, 2018.

Basis of Presentation

The Company’s consolidated financial statements include the accounts of the Company, the Operating Partnership, and their subsidiaries. Interests in the Operating Partnership not owned by the Company are referred to as “Noncontrolling Common Units.” These Noncontrolling Common Units are held by other limited partners in the form of common units (“Other Common Units”) and long term incentive plan units (“LTIP units”) issued pursuant to the STAG Industrial, Inc. 2011 Equity Incentive Plan, as amended and restated (the “2011 Plan”). All significant intercompany balances and transactions have been eliminated in the consolidation of entities. The financial statements of the Company are presented on a consolidated basis for all periods presented.

New Accounting Standards and Reclassifications

New Accounting Standards Adopted

In July 2018, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) 2018-11 which amends Topic 842, Leases, and provides lessors with a practical expedient, by class of underlying asset, to not separate non-lease components from the associated lease component and, instead, to account for those components as a single component if the non-lease components otherwise would be accounted for under the new revenue guidance and both of the following are met: i) the timing and pattern of transfer of the non-lease component(s) and associated lease component are the same; and ii) the lease component, if accounted for separately, would be classified as an operating lease. Under this new expedient, if the non-lease components associated with the lease component are the predominant component of the combined component, a company should account for the combined component in accordance with Topic 606, Revenue from Contracts with Customers. Otherwise, the company should account for the combined component as an operating lease in accordance with Topic 842. In December 2018, the FASB issued ASU 2018-20 which amends Topic 842, Leases, and allows lessors to continue to exclude from revenue the lessor costs that are paid by lessees directly to third parties. The Company adopted Topic 842 on

January 1, 2019, using the practical expedient, and it did not have a material impact on the Company’s consolidated financial statements. The Company determined that for all leases where the Company is the lessor, that the timing and pattern of transfer of the non-lease components and associated lease components are the same, and that the lease components, if accounted for separately, would be classified as an operating lease. Accordingly, the Company has made an accounting policy election to recognize the combined component in accordance with Topic 842 as rental income on the accompanying Consolidated Statements of Operations.

In February 2016, the FASB issued ASU 2016-02, Leases (Topic 842), and various subsequent ASU’s, which set out the principles for the recognition, measurement, presentation and disclosure of leases for both parties to a contract (i.e. lessees and lessors). Topic 842 superseded the previous leases standard, Topic 840, Leases. The new standard requires lessees to apply a dual approach, classifying leases as either finance or operating leases based on the principle of whether or not the lease is effectively a financed purchase by the lessee. This classification determines whether lease expense is recognized based on an effective interest method or on a straight line basis over the term of the lease, respectively. A lessee is also required to record a right-of-use asset and a lease liability for all leases with a term of greater than 12 months regardless of their classification. Leases with a term of 12 months or less are accounted for similar to the previous guidance for operating leases. The new standard requires lessors to account for leases using an approach that is substantially equivalent to the previous guidance for sales-type leases, direct financing leases and operating leases. ASU 2016-02 impacted the Company’s consolidated financial statements as the Company has ground leases and its corporate office lease for which it is the lessee, which resulted in the recording of a right-of-use asset and the related lease liability.

The Company adopted ASU 2016-02 on January 1, 2019, using the modified retrospective transition method. The adoption of this standard resulted in a cumulative effect adjustment of approximately $0.2 million recorded as an increase to cumulative dividends in excess of earnings as of January 1, 2019 in the accompanying Consolidated Statements of Equity. The cumulative effect adjustment related to initial direct costs of leases where the Company is the lessor and that, as of January 1, 2019, had not begun to amortize and are no longer allowed to be capitalized under the new standard. On January 1, 2019, the Company recognized operating lease right-of-use assets of approximately $16.3 million and related operating lease liabilities of approximately $18.0 million on the accompanying Consolidated Balance Sheets, related to the leases where the Company is the lessee. The Company adopted the new standard using the practical expedient package which allowed the Company to (i) not reassess whether any expired or existing contracts are or contain leases; (ii) not reassess the lease classification for any expired or existing leases; and (iii) not reassess initial direct costs for any existing leases. This practical expedient allows the Company to continue to account for its ground leases as operating leases. Prospectively, any new or modified ground leases may be classified as a financing lease. The adoption of this standard by the Company has been applied as of January 1, 2019, and the comparative periods have not been restated.

For leases in which the Company is the lessee, the Company recognizes a right-of-use asset and corresponding lease liability on the accompanying Consolidated Balance Sheets equal to the present value of the fixed lease payments. In determining operating right-of-use asset and lease liability for the Company’s existing operating leases upon the adoption of the new lease guidance, the Company was required to estimate an appropriate incremental borrowing rate on a fully-collateralized basis for the terms of the leases. The Company utilized a market-based approach to estimate the incremental borrowing rate for each individual lease. Since the terms under the ground leases are significantly longer than the terms of borrowings available to the Company on a fully-collateralized basis, the estimate of this rate required significant judgment, and considered factors such as yields on outstanding public debt and other market based pricing on longer duration financing instruments.

The new leases standard requires the Company to evaluate cash basis versus accrual basis of rental income recognition based on the collectability of future lease payments.

Reclassifications

Prior period amounts have been reclassified to conform to the current year presentation due to the adoption of ASU 2016-02. Amounts previously classified as rental income and tenant recoveries in the prior period are now classified as rental income on the accompanying Consolidated Statements of Operations, as the Company has made an accounting policy election to combine these amounts that are accounted for under the new leases standard.

Certain other prior period amounts have been reclassified to conform to the current year presentation.

Restricted Cash

The following table presents a reconciliation of cash and cash equivalents and restricted cash reported on the accompanying Consolidated Balance Sheets to amounts reported on the accompanying Consolidated Statements of Cash Flows.

Reconciliation of cash and cash equivalents and restricted cash (in thousands)	September 30, 2019		December 31, 2018
Cash and cash equivalents	$	6,540	$	7,968
Restricted cash	2,733		14,574
Total cash and cash equivalents and restricted cash	$	9,273	$	22,542

Taxes

Federal Income Taxes

The Company’s taxable REIT subsidiaries recognized net income (loss) of approximately $0, $0.3 million, $(22,000) and $(0.1) million for the three and nine months ended September 30, 2019 and 2018, respectively, which has been included on the accompanying Consolidated Statements of Operations.

State and Local Income, Excise, and Franchise Tax

State and local income, excise, and franchise taxes in the amount of $0.3 million, $0.9 million, $0.1 million and $0.6 million have been recorded in other expenses on the accompanying Consolidated Statements of Operations for the three and nine months ended September 30, 2019 and 2018, respectively.

Uncertain Tax Positions

As of September 30, 2019 and December 31, 2018, there were no liabilities for uncertain tax positions.

Concentrations of Credit Risk

Management believes the current credit risk of the Company’s portfolio is reasonably well diversified and does not contain any unusual concentration of credit risk.

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Equity - Preferred Stock (Details) - $ / shares			3 Months Ended							9 Months Ended	12 Months Ended
	Oct. 15, 2019	Jun. 11, 2018	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Sep. 30, 2019	Dec. 31, 2018	Apr. 30, 2019	Jul. 11, 2018
Class of Stock [Line Items]
Preferred stock, shares authorized			20,000,000		15,000,000	15,000,000				20,000,000	15,000,000	20,000,000
Series C Preferred Stock
Class of Stock [Line Items]
Preferred stock, shares issued			3,000,000			3,000,000				3,000,000	3,000,000
Preferred stock, liquidation preference (in dollars per share)			$ 25.00			$ 25.00				$ 25.00	$ 25.00
Dividend rate (as a percent)										6.875%
Preferred Stock, Dividends Per Share, Declared			$ 0.4296875	$ 0.4296875	$ 0.4296875	$ 0.4296875	$ 0.4296875	$ 0.4296875	$ 0.4296875	$ 1.2890625	1.7187500
Dividends Payable, Date Declared			Jul. 15, 2019	Apr. 09, 2019	Jan. 10, 2019	Oct. 10, 2018	Jul. 11, 2018	Apr. 10, 2018	Feb. 14, 2018
Dividends Payable, Date to be Paid			Sep. 30, 2019	Jul. 01, 2019	Apr. 01, 2019	Dec. 31, 2018	Oct. 01, 2018	Jul. 02, 2018	Apr. 02, 2018
Series B Preferred Stock
Class of Stock [Line Items]
Preferred Stock, Dividends Per Share, Declared						$ 0	$ 0.0460069	$ 0.4140625	$ 0.4140625		$ 0.8741319
Dividends Payable, Date Declared							Jul. 11, 2018	Apr. 10, 2018	Feb. 14, 2018
Dividends Payable, Date to be Paid							Oct. 01, 2018	Jul. 02, 2018	Apr. 02, 2018
Stock Redeemed or Called During Period, Shares		2,800,000
Preferred Stock, Redemption Price Per Share													$ 25.00
Subsequent Event [Member] | Series C Preferred Stock
Class of Stock [Line Items]
Preferred Stock, Dividends Per Share, Declared	$ 0.4296875

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Derivative Financial Instruments - Risk Management and Unsecured Loan Swaps (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Interest Rate Swaps
Unsecured Term Loan Swaps
Notional amount assets	$ 250,000	$ 600,000
Notional amount liabilities	850,000	300,000
Notional amount liabilities	850,000	$ 300,000
Interest Rate Derivative, Regions Bank, March 01, 2013
Unsecured Term Loan Swaps
Notional amount assets	25,000
Derivative Asset, Fair Value, Gross Asset	$ 51
Fixed Interest Rate (as a percent)	1.33%
Fixed Interest Rate (as a percent)	1.33%
Interest Rate Derivative, Capital One, July 01, 2013
Unsecured Term Loan Swaps
Notional amount assets	$ 50,000
Derivative Asset, Fair Value, Gross Asset	$ 35
Fixed Interest Rate (as a percent)	1.681%
Fixed Interest Rate (as a percent)	1.681%
Interest Rate Derivative, Capital One, August 01, 2013
Unsecured Term Loan Swaps
Notional amount assets	$ 25,000
Derivative Asset, Fair Value, Gross Asset	$ 16
Fixed Interest Rate (as a percent)	1.703%
Fixed Interest Rate (as a percent)	1.703%
Interest Rate Derivative, Regions Bank, February 03, 2014
Unsecured Term Loan Swaps
Notional amount liabilities	$ 25,000
Derivative Liability, Fair Value, Gross Liability	$ (12)
Fixed Interest Rate (as a percent)	1.9925%
Notional amount liabilities	$ 25,000
Derivative Liability, Fair Value, Gross Liability	$ (12)
Fixed Interest Rate (as a percent)	1.9925%
Interest Rate Derivative, The Toronto-Dominion Bank, September 29, 2016
Unsecured Term Loan Swaps
Notional amount assets	$ 25,000
Derivative Asset, Fair Value, Gross Asset	$ 66
Fixed Interest Rate (as a percent)	1.383%
Fixed Interest Rate (as a percent)	1.383%
Interest Rate Derivative, PNC Bank, September 29, 2016
Unsecured Term Loan Swaps
Notional amount assets	$ 50,000
Derivative Asset, Fair Value, Gross Asset	$ 128
Fixed Interest Rate (as a percent)	1.3906%
Fixed Interest Rate (as a percent)	1.3906%
Interest Rate Derivative, Regions Bank, September 29, 2016
Unsecured Term Loan Swaps
Notional amount assets	$ 35,000
Derivative Asset, Fair Value, Gross Asset	$ 91
Fixed Interest Rate (as a percent)	1.3858%
Fixed Interest Rate (as a percent)	1.3858%
Interest Rate Derivative, US Bank, September 29, 2016
Unsecured Term Loan Swaps
Notional amount assets	$ 25,000
Derivative Asset, Fair Value, Gross Asset	$ 63
Fixed Interest Rate (as a percent)	1.395%
Fixed Interest Rate (as a percent)	1.395%
Interest Rate Derivative, Capital One, September 29, 2016
Unsecured Term Loan Swaps
Notional amount assets	$ 15,000
Derivative Asset, Fair Value, Gross Asset	$ 38
Fixed Interest Rate (as a percent)	1.395%
Fixed Interest Rate (as a percent)	1.395%
Interest Rate Derivative, Royal Bank of Canada, March 20, 2015
Unsecured Term Loan Swaps
Notional amount liabilities	$ 25,000
Derivative Liability, Fair Value, Gross Liability	$ (56)
Fixed Interest Rate (as a percent)	1.709%
Notional amount liabilities	$ 25,000
Derivative Liability, Fair Value, Gross Liability	$ (56)
Fixed Interest Rate (as a percent)	1.709%
Interest Rate Derivative, The Toronto-Dominion Bank, March 20, 2015
Unsecured Term Loan Swaps
Notional amount liabilities	$ 25,000
Derivative Liability, Fair Value, Gross Liability	$ (57)
Fixed Interest Rate (as a percent)	1.7105%
Notional amount liabilities	$ 25,000
Derivative Liability, Fair Value, Gross Liability	$ (57)
Fixed Interest Rate (as a percent)	1.7105%
Interest Rate Derivative, The Toronto-Dominion Bank, September 10, 2017
Unsecured Term Loan Swaps
Notional amount liabilities	$ 100,000
Derivative Liability, Fair Value, Gross Liability	$ (982)
Fixed Interest Rate (as a percent)	2.2255%
Notional amount liabilities	$ 100,000
Derivative Liability, Fair Value, Gross Liability	$ (982)
Fixed Interest Rate (as a percent)	2.2255%
Interest Rate Derivative, Wells Fargo Bank, March 20, 2015
Unsecured Term Loan Swaps
Notional amount liabilities	$ 25,000
Derivative Liability, Fair Value, Gross Liability	$ (246)
Fixed Interest Rate (as a percent)	1.828%
Notional amount liabilities	$ 25,000
Derivative Liability, Fair Value, Gross Liability	$ (246)
Fixed Interest Rate (as a percent)	1.828%
Interest Rate Derivative, The Toronto-Dominion Bank, February 14, 2020
Unsecured Term Loan Swaps
Notional amount liabilities	$ 25,000
Derivative Liability, Fair Value, Gross Liability	$ (579)
Fixed Interest Rate (as a percent)	2.4535%
Notional amount liabilities	$ 25,000
Derivative Liability, Fair Value, Gross Liability	$ (579)
Fixed Interest Rate (as a percent)	2.4535%
Interest Rate Derivative, Regions Bank, February 14, 2020
Unsecured Term Loan Swaps
Notional amount liabilities	$ 50,000
Derivative Liability, Fair Value, Gross Liability	$ (1,181)
Fixed Interest Rate (as a percent)	2.475%
Notional amount liabilities	$ 50,000
Derivative Liability, Fair Value, Gross Liability	$ (1,181)
Fixed Interest Rate (as a percent)	2.475%
Interest Rate Derivative, Capital One, February 14, 2020
Unsecured Term Loan Swaps
Notional amount liabilities	$ 50,000
Derivative Liability, Fair Value, Gross Liability	$ (1,238)
Fixed Interest Rate (as a percent)	2.53%
Notional amount liabilities	$ 50,000
Derivative Liability, Fair Value, Gross Liability	$ (1,238)
Fixed Interest Rate (as a percent)	2.53%
Interest Rate Derivative, The Toronto-Dominion Bank, October 30, 2017
Unsecured Term Loan Swaps
Notional amount liabilities	$ 25,000
Derivative Liability, Fair Value, Gross Liability	$ (362)
Fixed Interest Rate (as a percent)	1.8485%
Notional amount liabilities	$ 25,000
Derivative Liability, Fair Value, Gross Liability	$ (362)
Fixed Interest Rate (as a percent)	1.8485%
Interest Rate Derivative, Royal Bank of Canada, October 30, 2017
Unsecured Term Loan Swaps
Notional amount liabilities	$ 25,000
Derivative Liability, Fair Value, Gross Liability	$ (364)
Fixed Interest Rate (as a percent)	1.8505%
Notional amount liabilities	$ 25,000
Derivative Liability, Fair Value, Gross Liability	$ (364)
Fixed Interest Rate (as a percent)	1.8505%
Interest Rate Derivative, Wells Fargo Bank, October 30, 2017
Unsecured Term Loan Swaps
Notional amount liabilities	$ 25,000
Derivative Liability, Fair Value, Gross Liability	$ (364)
Fixed Interest Rate (as a percent)	1.8505%
Notional amount liabilities	$ 25,000
Derivative Liability, Fair Value, Gross Liability	$ (364)
Fixed Interest Rate (as a percent)	1.8505%
Interest Rate Derivative, PNC Bank, $25m, October 30, 2017
Unsecured Term Loan Swaps
Notional amount liabilities	$ 25,000
Derivative Liability, Fair Value, Gross Liability	$ (362)
Fixed Interest Rate (as a percent)	1.8485%
Notional amount liabilities	$ 25,000
Derivative Liability, Fair Value, Gross Liability	$ (362)
Fixed Interest Rate (as a percent)	1.8485%
Interest Rate Derivative, PNC Bank, $50m, October 30, 2017
Unsecured Term Loan Swaps
Notional amount liabilities	$ 50,000
Derivative Liability, Fair Value, Gross Liability	$ (723)
Fixed Interest Rate (as a percent)	1.8475%
Notional amount liabilities	$ 50,000
Derivative Liability, Fair Value, Gross Liability	$ (723)
Fixed Interest Rate (as a percent)	1.8475%
Interest Rate Derivative, The Toronto-Dominion Bank, July 26, 2019 [Member]
Unsecured Term Loan Swaps
Notional amount liabilities	$ 50,000
Derivative Liability, Fair Value, Gross Liability	$ (3,229)
Fixed Interest Rate (as a percent)	2.918%
Notional amount liabilities	$ 50,000
Derivative Liability, Fair Value, Gross Liability	$ (3,229)
Fixed Interest Rate (as a percent)	2.918%
Interest Rate Derivative, PNC Bank, July 26, 2019 [Member]
Unsecured Term Loan Swaps
Notional amount liabilities	$ 50,000
Derivative Liability, Fair Value, Gross Liability	$ (3,232)
Fixed Interest Rate (as a percent)	2.919%
Notional amount liabilities	$ 50,000
Derivative Liability, Fair Value, Gross Liability	$ (3,232)
Fixed Interest Rate (as a percent)	2.919%
Interest Rate Derivative, Bank of Montreal, July 26, 2019 [Member]
Unsecured Term Loan Swaps
Notional amount liabilities	$ 50,000
Derivative Liability, Fair Value, Gross Liability	$ (3,232)
Fixed Interest Rate (as a percent)	2.919%
Notional amount liabilities	$ 50,000
Derivative Liability, Fair Value, Gross Liability	$ (3,232)
Fixed Interest Rate (as a percent)	2.919%
Interest Rate Derivative, US Bank, July 26, 2019 [Member]
Unsecured Term Loan Swaps
Notional amount liabilities	$ 25,000
Derivative Liability, Fair Value, Gross Liability	$ (1,616)
Fixed Interest Rate (as a percent)	2.919%
Notional amount liabilities	$ 25,000
Derivative Liability, Fair Value, Gross Liability	$ (1,616)
Fixed Interest Rate (as a percent)	2.919%
Interest Rate Derivative, Wells Fargo Bank, July 15, 2020 [Member]
Unsecured Term Loan Swaps
Notional amount liabilities	$ 50,000
Derivative Liability, Fair Value, Gross Liability	$ (2,030)
Fixed Interest Rate (as a percent)	2.246%
Notional amount liabilities	$ 50,000
Derivative Liability, Fair Value, Gross Liability	$ (2,030)
Fixed Interest Rate (as a percent)	2.246%
Interest Rate Derivative, US Bank, July 15, 2020 [Member]
Unsecured Term Loan Swaps
Notional amount liabilities	$ 50,000
Derivative Liability, Fair Value, Gross Liability	$ (2,029)
Fixed Interest Rate (as a percent)	2.2459%
Notional amount liabilities	$ 50,000
Derivative Liability, Fair Value, Gross Liability	$ (2,029)
Fixed Interest Rate (as a percent)	2.2459%
Interest Rate Derivative, Regions Bank, July 15, 2020 [Member]
Unsecured Term Loan Swaps
Notional amount liabilities	$ 50,000
Derivative Liability, Fair Value, Gross Liability	$ (2,032)
Fixed Interest Rate (as a percent)	2.2459%
Notional amount liabilities	$ 50,000
Derivative Liability, Fair Value, Gross Liability	$ (2,032)
Fixed Interest Rate (as a percent)	2.2459%
Interest Rate Derivative, Bank of Montreal, July 15, 2020
Unsecured Term Loan Swaps
Notional amount liabilities	$ 50,000
Derivative Liability, Fair Value, Gross Liability	$ (886)
Fixed Interest Rate (as a percent)	1.7165%
Notional amount liabilities	$ 50,000
Derivative Liability, Fair Value, Gross Liability	$ (886)
Fixed Interest Rate (as a percent)	1.7165%

XML

Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Statement of Comprehensive Income [Abstract]
Net income	$ 11,190	$ 8,876	$ 32,749	$ 48,989
Other comprehensive income (loss):
Income (loss) on interest rate swaps	(6,435)	2,060	(29,441)	12,811
Other comprehensive income (loss)	(6,435)	2,060	(29,441)	12,811
Comprehensive income	4,755	10,936	3,308	61,800
Income attributable to noncontrolling interest after preferred stock dividends	(290)	(281)	(912)	(1,589)
Other comprehensive (income) loss attributable to noncontrolling interest	176	(76)	930	(509)
Comprehensive income attributable to STAG Industrial, Inc.	$ 4,641	$ 10,579	$ 3,326	$ 59,702

XML

Document and Entity Information - shares	9 Months Ended
	Sep. 30, 2019	Oct. 29, 2019
Entity Information [Line Items]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Sep. 30, 2019
Document Transition Report	false
Entity File Number	1-34907
Entity Registrant Name	STAG Industrial, Inc.
Entity Incorporation, State or Country Code	MD
Entity Tax Identification Number	27-3099608
Entity Address, Address Line One	One Federal Street
Entity Address, Address Line Two	23rd Floor
Entity Address, City or Town	Boston,
Entity Address, State or Province	MA
Entity Address, Postal Zip Code	02110
City Area Code	617
Local Phone Number	574-4777
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		132,957,164
Entity Central Index Key	0001479094
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2019
Document Fiscal Period Focus	Q3
Amendment Flag	false
Entity Central Index Key	0001479094
Current Fiscal Year End Date	--12-31
Common Stock
Entity Information [Line Items]
Title of 12(b) Security	Common stock, $0.01 par value per share
Trading Symbol	STAG
Security Exchange Name	NYSE
Series C Preferred Stock
Entity Information [Line Items]
Title of 12(b) Security	6.875% Series C Cumulative Redeemable Preferred Stock ($0.01 par value)
Trading Symbol	STAG-PC
Security Exchange Name	NYSE

XML

Rental Property - Deferred Leasing Intangibles (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018
Finite-Lived Intangible Assets [Line Items]
Deferred leasing intangibles, gross	$ 655,278		$ 655,278		$ 588,517
Deferred leasing intangibles assets, accumulated amortization	(241,323)		(241,323)		(246,502)
Deferred leasing intangibles, net	413,955		413,955		342,015
Below market lease, gross	31,496		31,496		34,331
Below market lease, accumulated amortization	(11,259)		(11,259)		(12,764)
Below market lease, net	20,237		20,237		21,567
Net decrease to rental income related to above and below market lease amortization	1,248	$ 1,150	3,361	$ 3,206
Above market leases
Finite-Lived Intangible Assets [Line Items]
Deferred leasing intangibles, gross	88,388		88,388		73,122
Deferred leasing intangibles assets, accumulated amortization	(33,439)		(33,439)		(31,059)
Deferred leasing intangibles, net	54,949		54,949		42,063
Other intangible lease assets
Finite-Lived Intangible Assets [Line Items]
Deferred leasing intangibles, gross	566,890		566,890		515,395
Deferred leasing intangibles assets, accumulated amortization	(207,884)		(207,884)		(215,443)
Deferred leasing intangibles, net	359,006		359,006		$ 299,952
Amortization expense related to other intangible lease assets	18,472	$ 20,361	53,185	$ 56,698
Estimated Net Amortization of In-Place Leases, Leasing Commissions and Tenant Relationships
Remainder of 2019	18,698		18,698
2020	66,090		66,090
2021	54,264		54,264
2022	45,234		45,234
2023	37,492		37,492
Net decrease to rental income related to above and below market lease amortization
Estimated Net Amortization of In-Place Leases, Leasing Commissions and Tenant Relationships
Remainder of 2019	1,283		1,283
2020	4,870		4,870
2021	3,559		3,559
2022	2,657		2,657
2023	$ 2,608		$ 2,608

XML

Earnings Per Share (Details) - shares	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Earnings Per Share [Abstract]
Participating securities	220,284	193,117	218,231	196,871

XML

Summary of Significant Accounting Policies - Cash, Cash Equivalents and Restricted Cash (Tables)

9 Months Ended

Sep. 30, 2019

Accounting Policies [Abstract]

Schedule of Cash, Cash Equivalents and Restricted Cash

The following table presents a reconciliation of cash and cash equivalents and restricted cash reported on the accompanying Consolidated Balance Sheets to amounts reported on the accompanying Consolidated Statements of Cash Flows.

Reconciliation of cash and cash equivalents and restricted cash (in thousands)	September 30, 2019		December 31, 2018
Cash and cash equivalents	$	6,540	$	7,968
Restricted cash	2,733		14,574
Total cash and cash equivalents and restricted cash	$	9,273	$	22,542

XML

Equity (Tables)

9 Months Ended

Sep. 30, 2019

Stockholders' Equity Note [Abstract]

Schedule of Stock by Class

The following table summarizes the Company’s outstanding preferred stock issuances as of September 30, 2019.

Preferred Stock Issuances	Issuance Date	Number of Shares	Liquidation Value Per Share		Interest Rate
6.875% Series C Cumulative Redeemable Preferred Stock ("Series C Preferred Stock")	March 17, 2016	3,000,000	$	25.00	6.875	%

Dividends Declared [Table Text Block]

The following tables summarize the dividends attributable to the Company’s outstanding preferred stock issuances during the nine months ended September 30, 2019 and the year ended December 31, 2018.

Quarter Ended 2019	Declaration Date	Series C Preferred Stock Per Share		Payment Date
September 30	July 15, 2019	$	0.4296875	September 30, 2019
June 30	April 9, 2019	0.4296875		July 1, 2019
March 31	January 10, 2019	0.4296875		April 1, 2019
Total		$	1.2890625

Quarter Ended 2018	Declaration Date	Series B Preferred Stock Per Share			Series C Preferred Stock Per Share		Payment Date
December 31	October 10, 2018	$	—		$	0.4296875	December 31, 2018
September 30	July 11, 2018	0.0460069		(1)	0.4296875		October 1, 2018
June 30	April 10, 2018	0.4140625			0.4296875		July 2, 2018
March 31	February 14, 2018	0.4140625			0.4296875		April 2, 2018
Total		$	0.8741319		$	1.7187500

(1)On June 11, 2018, the Company gave notice to redeem all 2,800,000 issued and outstanding shares of the 6.625% Series B Cumulative Redeemable Preferred Stock (“Series B Preferred Stock”). On July 11, 2018, the Company redeemed all of the Series B Preferred Stock at a cash redemption price of $25.00 per share, plus accrued and unpaid dividends to but excluding the redemption date, without interest.

On October 15, 2019, the Company’s board of directors declared the Series C Preferred Stock dividends for the quarter ending December 31, 2019 at a quarterly rate of $0.4296875 per share.

Schedule of stock sale activity

The following table summarizes the terms of the Company’s at-the market (“ATM”) common stock offering program as of September 30, 2019.

ATM Common Stock Offering Program	Date	Maximum Aggregate Offering Price (in thousands)		Aggregate Common Stock Available as of September 30, 2019 (in thousands)
2019 $600 million ATM	February 14, 2019	$	600,000	$	401,137

The following tables summarize the activity under the ATM common stock offering programs during the nine months ended September 30, 2019 and year ended December 31, 2018 (in thousands, except share data).

	Nine months ended September 30, 2019
ATM Common Stock Offering Program	Shares Sold	Weighted Average Price Per Share		Net Proceeds
2019 $600 million ATM	7,022,332	$	28.32	$	197,074
Total/weighted average	7,022,332	$	28.32	$	197,074

	Year ended December 31, 2018
ATM Common Stock Offering Program	Shares Sold	Weighted Average Price Per Share		Net Proceeds
2017 $500 million ATM (1)	14,724,614	$	26.52	$	386,407
Total/weighted average	14,724,614	$	26.52	$	386,407

(1) This program ended in February 2019.

On September 24, 2019, the Company completed an underwritten public offering of an aggregate 12,650,000 shares of common stock at a price to the underwriters of $28.60 per share, consisting of (i) 5,500,000 shares offered directly by the Company and (ii) 7,150,000 shares offered by the forward dealer in connection with certain forward sale agreements (including 1,650,000 shares offered pursuant to the underwriters’ option to purchase additional shares, which option was exercised in full). The offering closed on September 27, 2019 and the Company received net proceeds from the sale of shares offered directly by the Company of $157.3 million. Subject to the Company's right to elect cash or net share settlement, the Company has the ability to settle the forward sales agreements at any time through scheduled maturity date of the forward sale agreements of September 24, 2020.

On April 1, 2019, the Company completed an underwritten public offering of 7,475,000 shares of common stock (including 975,000 shares issued pursuant to the underwriters’ option to purchase additional shares, which option was exercised in full) at a price to the underwriters of $28.72 per share. The offering closed on April 4, 2019 and the Company received net proceeds of approximately $214.7 million.

Common Stock Dividends Declared [Table Text Block]

The following tables summarize the dividends attributable to the Company’s outstanding shares of common stock that were declared during the nine months ended September 30, 2019 and the year ended December 31, 2018.

Month Ended 2019	Declaration Date	Record Date	Per Share		Payment Date
September 30	July 15, 2019	September 30, 2019	$	0.119167	October 15, 2019
August 31	July 15, 2019	August 30, 2019	0.119167		September 16, 2019
July 31	July 15, 2019	July 31, 2019	0.119167		August 15, 2019
June 30	April 9, 2019	June 28, 2019	0.119167		July 15, 2019
May 31	April 9, 2019	May 31, 2019	0.119167		June 17, 2019
April 30	April 9, 2019	April 30, 2019	0.119167		May 15, 2019
March 31	January 10, 2019	March 29, 2019	0.119167		April 15, 2019
February 28	January 10, 2019	February 28, 2019	0.119167		March 15, 2019
January 31	January 10, 2019	January 31, 2019	0.119167		February 15, 2019
Total			$	1.072503

Month Ended 2018	Declaration Date	Record Date	Per Share		Payment Date
December 31	October 10, 2018	December 31, 2018	$	0.118333	January 15, 2019
November 30	October 10, 2018	November 30, 2018	0.118333		December 17, 2018
October 31	October 10, 2018	October 31, 2018	0.118333		November 15, 2018
September 30	July 11, 2018	September 28, 2018	0.118333		October 15, 2018
August 31	July 11, 2018	August 31, 2018	0.118333		September 17, 2018
July 31	July 11, 2018	July 31, 2018	0.118333		August 15, 2018
June 30	April 10, 2018	June 29, 2018	0.118333		July 16, 2018
May 31	April 10, 2018	May 31, 2018	0.118333		June 15, 2018
April 30	April 10, 2018	April 30, 2018	0.118333		May 15, 2018
March 31	November 2, 2017	March 29, 2018	0.118333		April 16, 2018
February 28	November 2, 2017	February 28, 2018	0.118333		March 15, 2018
January 31	November 2, 2017	January 31, 2018	0.118333		February 15, 2018
Total			$	1.419996

On October 15, 2019, the Company’s board of directors declared the common stock dividends for the months ending October 31, 2019, November 30, 2019, and December 31, 2019 at a monthly rate of $0.119167 per share of common stock.

Schedule of activity related to unvested restricted stock awards

The following table summarizes activity related to the Company’s unvested restricted shares of common stock for the nine months ended September 30, 2019 and the year ended December 31, 2018.

Unvested Restricted Shares of Common Stock	Shares
Balance at December 31, 2017	237,207
Granted	76,659	(1)
Vested	(112,405)	(2)
Forfeited	(10,999)
Balance at December 31, 2018	190,462
Granted	110,830	(1)
Vested	(78,431)	(2)
Forfeited	(2,589)
Balance at September 30, 2019	220,272

(1)The fair value per share on the grant date of January 7, 2019 and January 5, 2018 was $24.85 and $26.40, respectively.

(2)The Company repurchased and retired 58,697 and 41,975 restricted shares of common stock that vested during the nine months ended September 30, 2019 and the year ended December 31, 2018, respectively.

Schedule of vested restricted shares of common stock activity

The following table summarizes the fair value at vesting for the restricted shares of common stock that vested during the three and nine months ended September 30, 2019 and 2018.

	Three months ended September 30,				Nine months ended September 30,
Vested Restricted Shares of Common Stock	2019		2018		2019		2018
Vested restricted shares of common stock	—		—		78,431		112,405
Fair value of vested restricted shares of common stock (in thousands)	$	—	$	—	$	1,951	$	3,002

XML

Earnings Per Share (Tables)

9 Months Ended

Sep. 30, 2019

Earnings Per Share [Abstract]

Schedule of computation of basic and diluted earnings per common share

The following table reconciles the numerators and denominators in the computation of basic and diluted earnings per common share for the three and nine months ended September 30, 2019 and 2018.

	Three months ended September 30,				Nine months ended September 30,
Earnings Per Share (in thousands, except per share data)	2019		2018		2019		2018
Numerator
Net income attributable to common stockholders	$	9,533	$	7,237	$	27,734	$	38,215
Denominator
Weighted average common shares outstanding — basic	127,272		105,783		122,460		101,095
Effect of dilutive securities(1)
Share-based compensation	178		550		254		400
Shares issuable under forward sales agreements	19		—		6		—
Weighted average common shares outstanding — diluted	127,469		106,333		122,720		101,495
Net income per share — basic and diluted
Net income per share attributable to common stockholders — basic	$	0.07	$	0.07	$	0.23	$	0.38
Net income per share attributable to common stockholders — diluted	$	0.07	$	0.07	$	0.23	$	0.38

(1)During the three and nine months ended September 30, 2019 and 2018, there were 220, 218, 193 and 197, unvested shares of restricted common stock, respectively, on a weighted average basis that were not included in the computation of diluted earnings per share because the allocation of income under the two-class method was more dilutive.

XML

Derivative Financial Instruments - FV of Interest Rate Swaps (Details) - Interest Rate Swaps - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Fair value of the interest rate swaps outstanding
Notional amount assets	$ 250,000	$ 600,000
Fair value - assets	488	9,151
Notional amount liabilities	850,000	300,000
Fair Value - liabilities	$ (24,812)	$ (4,011)

XML

Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Revenues [Abstract]
Rental income	$ 102,294	$ 88,677	$ 294,271	$ 256,670
Other income	127	269	498	1,033
Total revenue	102,421	88,946	294,769	257,703
Expenses
Property	18,157	17,112	54,623	50,735
General and administrative	8,924	8,911	26,723	25,637
Depreciation and amortization	46,908	44,355	133,844	125,221
Loss on impairments	4,413	0	9,757	2,934
Other expenses	458	223	1,284	864
Total expenses	78,860	70,601	226,231	205,391
Other income (expense)
Interest and other income	12	3	30	16
Interest expense	(14,053)	(12,698)	(39,080)	(35,602)
Loss on extinguishment of debt	0	(13)	0	(13)
Gain on the sales of rental property, net	1,670	3,239	3,261	32,276
Total other income (expense)	(12,371)	(9,469)	(35,789)	(3,323)
Net income	11,190	8,876	32,749	48,989
Less: income attributable to noncontrolling interest after preferred stock dividends	290	281	912	1,589
Net income attributable to STAG Industrial, Inc.	10,900	8,595	31,837	47,400
Less: preferred stock dividends	1,289	1,289	3,867	6,315
Less: redemption of preferred stock	0	0	0	2,661
Less: amount allocated to participating securities	78	69	236	209
Net income attributable to common stockholders	$ 9,533	$ 7,237	$ 27,734	$ 38,215
Weighted average common shares outstanding — basic	127,272	105,783	122,460	101,095
Weighted average common shares outstanding — diluted	127,469	106,333	122,720	101,495
Net income per share — basic and diluted
Net income per share attributable to common stockholders — basic	$ 0.07	$ 0.07	$ 0.23	$ 0.38
Net income per share attributable to common stockholders — diluted	$ 0.07	$ 0.07	$ 0.23	$ 0.38

XML

Debt - Summary (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2019	Jul. 12, 2019	Dec. 31, 2018
Debt Instrument [Line Items]
Long-term debt, gross	$ 1,483,570		$ 1,332,511
Unamortized debt issuance costs	(6,582)		(6,653)
Unamortized fair market value premium	42		50
Principal outstanding	$ 1,477,030		1,325,908
Weighted average interest rate	3.58%
Interest Rate Swaps
Debt Instrument [Line Items]
Notional amount	$ 775,000
London Interbank Offered Rate (LIBOR) [Member]
Debt Instrument [Line Items]
Stated interest rate	2.01563%
$200 Million Unsecured Term Loan F [Member]
Debt Instrument [Line Items]
Long-term debt, gross	$ 200,000	$ 200,000
$200 Million Unsecured Term Loan F [Member] | London Interbank Offered Rate (LIBOR) [Member]
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate	1.00%
Unsecured Credit Facility
Debt Instrument [Line Items]
Principal outstanding	$ 78,000		100,500
Debt Instrument, Maturity Date	Jan. 15, 2023
Maximum borrowing capacity	$ 500,000
Unsecured Credit Facility | London Interbank Offered Rate (LIBOR) [Member]
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate	0.90%
Unsecured Credit Facility | Prepaid Expenses and Other Assets
Debt Instrument [Line Items]
Unamortized debt issuance costs	$ (2,600)		(3,200)
Unsecured Term Loans
Debt Instrument [Line Items]
Long-term debt, gross	775,000		600,000
Unamortized debt issuance costs	(3,963)		(3,640)
Principal outstanding	771,037		596,360
Unsecured Term Loans | $150 Million Wells Fargo Unsecured Term Loan C
Debt Instrument [Line Items]
Long-term debt, gross	$ 150,000		150,000
Stated interest rate	2.39%
Debt Instrument, Maturity Date	Sep. 29, 2020
Fixed Interest Rate (as a percent)	1.39%
Unsecured Term Loans | $150 Million Wells Fargo Unsecured Term Loan B
Debt Instrument [Line Items]
Long-term debt, gross	$ 150,000		150,000
Stated interest rate	3.05%
Debt Instrument, Maturity Date	Mar. 21, 2021
Fixed Interest Rate (as a percent)	2.05%
Unsecured Term Loans | $150 Million Wells Fargo Unsecured Term Loan A
Debt Instrument [Line Items]
Long-term debt, gross	$ 150,000		150,000
Stated interest rate	2.70%
Debt Instrument, Maturity Date	Mar. 31, 2022
Fixed Interest Rate (as a percent)	1.70%
Unsecured Term Loans | $150 Million Unsecured Term Loan D [Member]
Debt Instrument [Line Items]
Long-term debt, gross	$ 150,000		150,000
Stated interest rate	2.85%
Debt Instrument, Maturity Date	Jan. 04, 2023
Fixed Interest Rate (as a percent)	1.85%
Unsecured Term Loans | $175 Million Unsecured Term Loan E [Member]
Debt Instrument [Line Items]
Long-term debt, gross	$ 175,000		0
Stated interest rate	3.92%
Debt Instrument, Maturity Date	Jan. 15, 2024
Fixed Interest Rate (as a percent)	2.92%
Unsecured Term Loans | $200 Million Unsecured Term Loan F [Member]
Debt Instrument [Line Items]
Long-term debt, gross	$ 0		0
Stated interest rate	3.11%
Debt Instrument, Maturity Date	Jan. 12, 2025
Fixed Interest Rate (as a percent)	2.11%
Unsecured Notes
Debt Instrument [Line Items]
Long-term debt, gross	$ 575,000		575,000
Unamortized debt issuance costs	(2,217)		(2,512)
Principal outstanding	572,783		572,488
Unsecured Notes | $100 Million Series F Unsecured Notes
Debt Instrument [Line Items]
Long-term debt, gross	$ 100,000		100,000
Stated interest rate	3.98%
Debt Instrument, Maturity Date	Jan. 05, 2023
Unsecured Notes | $50 Million Series A Unsecured Notes
Debt Instrument [Line Items]
Long-term debt, gross	$ 50,000		50,000
Stated interest rate	4.98%
Debt Instrument, Maturity Date	Oct. 01, 2024
Unsecured Notes | $100 Million Series D Unsecured Notes
Debt Instrument [Line Items]
Long-term debt, gross	$ 100,000		100,000
Stated interest rate	4.32%
Debt Instrument, Maturity Date	Feb. 20, 2025
Unsecured Notes | $75 Million Series G Unsecured Notes [Member]
Debt Instrument [Line Items]
Long-term debt, gross	$ 75,000		75,000
Stated interest rate	4.10%
Debt Instrument, Maturity Date	Jun. 13, 2025
Unsecured Notes | $50 Million Series B Unsecured Notes
Debt Instrument [Line Items]
Long-term debt, gross	$ 50,000		50,000
Stated interest rate	4.98%
Debt Instrument, Maturity Date	Jul. 01, 2026
Unsecured Notes | $80 Million Series C Unsecured Notes
Debt Instrument [Line Items]
Long-term debt, gross	$ 80,000		80,000
Stated interest rate	4.42%
Debt Instrument, Maturity Date	Dec. 30, 2026
Unsecured Notes | $20 Million Series E Unsecured Notes
Debt Instrument [Line Items]
Long-term debt, gross	$ 20,000		20,000
Stated interest rate	4.42%
Debt Instrument, Maturity Date	Feb. 20, 2027
Unsecured Notes | $100 Million Series H Unsecured Notes [Member]
Debt Instrument [Line Items]
Long-term debt, gross	$ 100,000		100,000
Stated interest rate	4.27%
Debt Instrument, Maturity Date	Jun. 13, 2028
Mortgage Loans Payable
Debt Instrument [Line Items]
Long-term debt, gross	$ 55,570		57,011
Unamortized debt issuance costs	(402)		(501)
Unamortized fair market value premium	42		50
Principal outstanding	55,210		56,560
Mortgage Loans Payable | Wells Fargo Bank, National Association CMBS Loan
Debt Instrument [Line Items]
Long-term debt, gross	$ 51,861		53,216
Stated interest rate	4.31%
Debt Instrument, Maturity Date	Dec. 01, 2022
Penalty free prepayment period	3 months
Mortgage Loans Payable | Thrivent Financial for Lutherans Due December 15, 2023 [Member]
Debt Instrument [Line Items]
Long-term debt, gross	$ 3,709		$ 3,795
Stated interest rate	4.78%
Debt Instrument, Maturity Date	Dec. 15, 2023
Penalty free prepayment period	3 months

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Organization and Description of Business	9 Months Ended
	Sep. 30, 2019
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Organization and Description of Business	Organization and Description of BusinessSTAG Industrial, Inc. (the “Company”) is an industrial real estate operating company focused on the acquisition and operation of single-tenant, industrial properties throughout the United States. The Company was formed as a Maryland corporation and has elected to be treated and intends to continue to qualify as a real estate investment trust (“REIT”) under Sections 856 through 860 of the Internal Revenue Code of 1986, as amended. The Company is structured as an umbrella partnership REIT, commonly called an UPREIT, and owns substantially all of its assets and conducts substantially all of its business through its operating partnership, STAG Industrial Operating Partnership, L.P., a Delaware limited partnership (the “Operating Partnership”). As of September 30, 2019 and December 31, 2018, the Company owned a 97.2% and 96.5%, respectively, common equity interest in the Operating Partnership. The Company, through its wholly owned subsidiary, is the sole general partner of the Operating Partnership. As used herein, the “Company” refers to STAG Industrial, Inc. and its consolidated subsidiaries and partnerships, including the Operating Partnership, except where context otherwise requires.As of September 30, 2019, the Company owned 430 buildings in 37 states with approximately 86.0 million rentable square feet, consisting of 356 warehouse/distribution buildings, 66 light manufacturing buildings, and eight flex/office buildings.

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Equity - Common Stock ATM (Details) - USD ($) $ / shares in Units, $ in Thousands					9 Months Ended	12 Months Ended
	Sep. 27, 2019	Sep. 24, 2019	Apr. 04, 2019	Apr. 01, 2019	Sep. 30, 2019	Dec. 31, 2018	Apr. 30, 2019	Mar. 31, 2019
Class of Stock [Line Items]
Common stock, shares authorized					300,000,000	150,000,000	300,000,000	150,000,000
Net proceeds from the sale of common stock	$ 157,300		$ 214,700
Sale of Stock, Number of Shares Issued in Transaction		12,650,000		7,475,000
Shares Issued, Price Per Share		$ 28.60		$ 28.72
Warrant [Member]
Class of Stock [Line Items]
Sale of Stock, Number of Shares Issued in Transaction		7,150,000
Common Stock
Class of Stock [Line Items]
Sale of Stock, Number of Shares Issued in Transaction		5,500,000
At The Market Program 2019 $600 Million
Class of Stock [Line Items]
Common Stock Value Authorized under Stock Offering Program					$ 600,000
At The Market Program 2019 $600 Million | Common Stock
Class of Stock [Line Items]
Aggregate value of common stock available to be sold under the ATM					$ 401,137
Number of shares sold					7,022,332
Net proceeds from the sale of common stock					$ 197,074
At The Market Program 2017 $500 Million | Common Stock
Class of Stock [Line Items]
Number of shares sold						14,724,614
Net proceeds from the sale of common stock						$ 386,407
Over-Allotment Option
Class of Stock [Line Items]
Sale of Stock, Number of Shares Issued in Transaction		1,650,000		975,000
Weighted Average | At The Market Program 2019 $600 Million | Common Stock
Class of Stock [Line Items]
Sale of Stock, Price Per Share					$ 28.32
Weighted Average | At The Market Program 2017 $500 Million | Common Stock
Class of Stock [Line Items]
Sale of Stock, Price Per Share						$ 26.52

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Leases - Maturity of Operating Lease Liabilities (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Leases [Abstract]
Remainder of Fiscal Year	$ 571
2020	2,294
2021	1,400
2022	1,107
2023	1,116
Thereafter	48,155
Lessee, Operating Lease, Liability, Payments, Due	54,643
Less: Imputed interest	(37,384)
Operating lease liabilities	$ 17,259	$ 0
2019		2,110
2020		2,122
2021		1,227
2022		935
2023		944
Thereafter		$ 45,580

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Leases (Tables)

9 Months Ended

Sep. 30, 2019

Leases [Abstract]

Operating Lease, Lease Income [Table Text Block]

The following table summarizes the components of rental income recognized during the three and nine months ended September 30, 2019 included in the accompanying Consolidated Statements of Operations.

	Three months ended September 30,		Nine months ended September 30,
Rental Income (in thousands)	2019		2019
Fixed lease payments	$	80,262	$	227,337
Variable lease payments	20,189		61,628
Straight-line rental income	3,091		8,667
Net decrease to rental income related to above and below market lease amortization	(1,248)		(3,361)
Total rental income	$	102,294	$	294,271

Lessor, Operating Lease, Payments to be Received, Maturity

The following table summarizes the maturity of fixed lease payments under the Company’s leases as of September 30, 2019.

Year (as of September 30, 2019)	Maturity of Fixed Lease Payments (in thousands)
Remainder of 2019	$	82,584
2020	$	325,907
2021	$	285,414
2022	$	249,287
2023	$	208,011
Thereafter	$	761,469

Schedule of minimum lease payments receivable

The following table summarizes the minimum contractual lease payments under the superseded leases standard, Topic 840, as of December 31, 2018.

Year (as of December 31, 2018)	Future Minimum Rents (in thousands)
2019	$	299,978
2020	$	271,936
2021	$	226,970
2022	$	188,707
2023	$	152,814
Thereafter	$	535,192

Lease, Cost [Table Text Block]

The following table summarizes supplemental information related to operating lease right-of-use assets and operating lease liabilities recognized in the Company’s Consolidated Balance Sheets as of September 30, 2019.

Operating Lease Term and Discount Rate	September 30, 2019
Weighted average remaining lease term (years)	35.7
Weighted average discount rate	7.1	%

The following table summarizes the operating lease cost recognized during the three and nine months ended September 30, 2019 included in the Company’s Consolidated Statements of Operations.

	Three months ended September 30,		Nine months ended September 30,
Operating Lease Cost (in thousands)	2019		2019
Operating lease cost included in property expense attributable to ground leases	$	331	$	993
Operating lease cost included in general and administrative expense attributable to corporate office lease	266		799
Total operating lease cost	$	597	$	1,792

The following table summarizes supplemental cash flow information related to operating leases recognized during the nine months ended September 30, 2019 in the Company’s Consolidated Statements of Cash Flows.

	Nine months ended September 30,
Operating Leases (in thousands)	2019
Cash paid for amounts included in the measurement of lease liabilities (operating cash flows)	$	1,711

Lessee, Operating Lease, Liability, Maturity [Table Text Block]

The following table summarizes the maturity of operating lease liabilities under the Company’s ground leases and corporate office lease as of September 30, 2019.

Year (as of September 30, 2019)	Maturity of Operating Lease Liabilities(1) (in thousands)
Remainder of 2019	$	571
2020	2,294
2021	1,400
2022	1,107
2023	1,116
Thereafter	48,155
Total lease payments	54,643
Less: Imputed interest	(37,384)
Present value of operating lease liabilities	$	17,259

(1)Operating lease liabilities do not include estimates of CPI rent changes required by certain ground lease agreements. Therefore, actual payments may differ than those presented.

Schedule Of Future Minimum Rental Payments For Operating Leases (Leasee) [Table Text Block]

The following table summarizes the minimum contractual lease payments under the superseded leases standard, Topic 840, as of December 31, 2018.

Year (as of December 31, 2018)	Future Minimum Rental Payments (1) (in thousands)
2019	$	2,110
2020	$	2,122
2021	$	1,227
2022	$	935
2023	$	944
Thereafter	$	45,580

(1)Future minimum rental payments do not include estimates of CPI rent changes required by certain lease agreements. Therefore, actual minimum rental payments may differ than those presented.

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Summary of Significant Accounting Policies (Policies)

9 Months Ended

Sep. 30, 2019

Accounting Policies [Abstract]

Quarterly Financial Information

Interim Financial Information

The accompanying interim financial statements have been presented in conformity with accounting principles generally accepted in the United States of America (“GAAP”) and with the instructions to Form 10-Q and Regulation S-X for interim financial information. Accordingly, these statements do not include all of the information and notes required by GAAP for complete financial statements. In the opinion of management, the accompanying interim financial statements include all adjustments, consisting of normal recurring items, necessary for their fair statement in conformity with GAAP. Interim results are not necessarily indicative of results for a full year. The year-end consolidated balance sheet data was derived from audited financial statements, but does not include all disclosures required by GAAP. The information included in this Quarterly Report on Form 10-Q should be read in conjunction with the Company’s consolidated financial statements and notes thereto contained in the Company’s Annual Report on Form 10-K for the fiscal year ended December 31, 2018.

Basis of Presentation

Basis of Presentation

The Company’s consolidated financial statements include the accounts of the Company, the Operating Partnership, and their subsidiaries. Interests in the Operating Partnership not owned by the Company are referred to as “Noncontrolling Common Units.” These Noncontrolling Common Units are held by other limited partners in the form of common units (“Other Common Units”) and long term incentive plan units (“LTIP units”) issued pursuant to the STAG Industrial, Inc. 2011 Equity Incentive Plan, as amended and restated (the “2011 Plan”). All significant intercompany balances and transactions have been eliminated in the consolidation of entities. The financial statements of the Company are presented on a consolidated basis for all periods presented.

New Accounting Pronouncements

New Accounting Standards Adopted

In July 2018, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) 2018-11 which amends Topic 842, Leases, and provides lessors with a practical expedient, by class of underlying asset, to not separate non-lease components from the associated lease component and, instead, to account for those components as a single component if the non-lease components otherwise would be accounted for under the new revenue guidance and both of the following are met: i) the timing and pattern of transfer of the non-lease component(s) and associated lease component are the same; and ii) the lease component, if accounted for separately, would be classified as an operating lease. Under this new expedient, if the non-lease components associated with the lease component are the predominant component of the combined component, a company should account for the combined component in accordance with Topic 606, Revenue from Contracts with Customers. Otherwise, the company should account for the combined component as an operating lease in accordance with Topic 842. In December 2018, the FASB issued ASU 2018-20 which amends Topic 842, Leases, and allows lessors to continue to exclude from revenue the lessor costs that are paid by lessees directly to third parties. The Company adopted Topic 842 on

January 1, 2019, using the practical expedient, and it did not have a material impact on the Company’s consolidated financial statements. The Company determined that for all leases where the Company is the lessor, that the timing and pattern of transfer of the non-lease components and associated lease components are the same, and that the lease components, if accounted for separately, would be classified as an operating lease. Accordingly, the Company has made an accounting policy election to recognize the combined component in accordance with Topic 842 as rental income on the accompanying Consolidated Statements of Operations.

In February 2016, the FASB issued ASU 2016-02, Leases (Topic 842), and various subsequent ASU’s, which set out the principles for the recognition, measurement, presentation and disclosure of leases for both parties to a contract (i.e. lessees and lessors). Topic 842 superseded the previous leases standard, Topic 840, Leases. The new standard requires lessees to apply a dual approach, classifying leases as either finance or operating leases based on the principle of whether or not the lease is effectively a financed purchase by the lessee. This classification determines whether lease expense is recognized based on an effective interest method or on a straight line basis over the term of the lease, respectively. A lessee is also required to record a right-of-use asset and a lease liability for all leases with a term of greater than 12 months regardless of their classification. Leases with a term of 12 months or less are accounted for similar to the previous guidance for operating leases. The new standard requires lessors to account for leases using an approach that is substantially equivalent to the previous guidance for sales-type leases, direct financing leases and operating leases. ASU 2016-02 impacted the Company’s consolidated financial statements as the Company has ground leases and its corporate office lease for which it is the lessee, which resulted in the recording of a right-of-use asset and the related lease liability.

The Company adopted ASU 2016-02 on January 1, 2019, using the modified retrospective transition method. The adoption of this standard resulted in a cumulative effect adjustment of approximately $0.2 million recorded as an increase to cumulative dividends in excess of earnings as of January 1, 2019 in the accompanying Consolidated Statements of Equity. The cumulative effect adjustment related to initial direct costs of leases where the Company is the lessor and that, as of January 1, 2019, had not begun to amortize and are no longer allowed to be capitalized under the new standard. On January 1, 2019, the Company recognized operating lease right-of-use assets of approximately $16.3 million and related operating lease liabilities of approximately $18.0 million on the accompanying Consolidated Balance Sheets, related to the leases where the Company is the lessee. The Company adopted the new standard using the practical expedient package which allowed the Company to (i) not reassess whether any expired or existing contracts are or contain leases; (ii) not reassess the lease classification for any expired or existing leases; and (iii) not reassess initial direct costs for any existing leases. This practical expedient allows the Company to continue to account for its ground leases as operating leases. Prospectively, any new or modified ground leases may be classified as a financing lease. The adoption of this standard by the Company has been applied as of January 1, 2019, and the comparative periods have not been restated.

For leases in which the Company is the lessee, the Company recognizes a right-of-use asset and corresponding lease liability on the accompanying Consolidated Balance Sheets equal to the present value of the fixed lease payments. In determining operating right-of-use asset and lease liability for the Company’s existing operating leases upon the adoption of the new lease guidance, the Company was required to estimate an appropriate incremental borrowing rate on a fully-collateralized basis for the terms of the leases. The Company utilized a market-based approach to estimate the incremental borrowing rate for each individual lease. Since the terms under the ground leases are significantly longer than the terms of borrowings available to the Company on a fully-collateralized basis, the estimate of this rate required significant judgment, and considered factors such as yields on outstanding public debt and other market based pricing on longer duration financing instruments.

The new leases standard requires the Company to evaluate cash basis versus accrual basis of rental income recognition based on the collectability of future lease payments.

Reclassification

Reclassifications

Prior period amounts have been reclassified to conform to the current year presentation due to the adoption of ASU 2016-02. Amounts previously classified as rental income and tenant recoveries in the prior period are now classified as rental income on the accompanying Consolidated Statements of Operations, as the Company has made an accounting policy election to combine these amounts that are accounted for under the new leases standard.

Certain other prior period amounts have been reclassified to conform to the current year presentation.

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Derivative Financial Instruments (Tables)

9 Months Ended

Sep. 30, 2019

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Schedule of Derivative Instruments [Table Text Block]

The following table summarizes the Company’s outstanding interest rate swaps as of September 30, 2019. All of the Company’s interest rate swaps are designated as qualifying cash flow hedges.

Interest Rate Derivative Counterparty	Trade Date	Effective Date	Notional Amount (in thousands)		Fair Value (in thousands)		Pay Fixed Interest Rate		Receive Variable Interest Rate	Maturity Date
Regions Bank	Mar-01-2013	Mar-01-2013	$	25,000	$	51	1.3300	%	One-month L	Feb-14-2020
Capital One, N.A.	Jun-13-2013	Jul-01-2013	$	50,000	$	35	1.6810	%	One-month L	Feb-14-2020
Capital One, N.A.	Jun-13-2013	Aug-01-2013	$	25,000	$	16	1.7030	%	One-month L	Feb-14-2020
Regions Bank	Sep-30-2013	Feb-03-2014	$	25,000	$	(12)	1.9925	%	One-month L	Feb-14-2020
The Toronto-Dominion Bank	Oct-14-2015	Sep-29-2016	$	25,000	$	66	1.3830	%	One-month L	Sep-29-2020
PNC Bank, N.A.	Oct-14-2015	Sep-29-2016	$	50,000	$	128	1.3906	%	One-month L	Sep-29-2020
Regions Bank	Oct-14-2015	Sep-29-2016	$	35,000	$	91	1.3858	%	One-month L	Sep-29-2020
U.S. Bank, N.A.	Oct-14-2015	Sep-29-2016	$	25,000	$	63	1.3950	%	One-month L	Sep-29-2020
Capital One, N.A.	Oct-14-2015	Sep-29-2016	$	15,000	$	38	1.3950	%	One-month L	Sep-29-2020
Royal Bank of Canada	Jan-08-2015	Mar-20-2015	$	25,000	$	(56)	1.7090	%	One-month L	Mar-21-2021
The Toronto-Dominion Bank	Jan-08-2015	Mar-20-2015	$	25,000	$	(57)	1.7105	%	One-month L	Mar-21-2021
The Toronto-Dominion Bank	Jan-08-2015	Sep-10-2017	$	100,000	$	(982)	2.2255	%	One-month L	Mar-21-2021
Wells Fargo, N.A.	Jan-08-2015	Mar-20-2015	$	25,000	$	(246)	1.8280	%	One-month L	Mar-31-2022
The Toronto-Dominion Bank	Jan-08-2015	Feb-14-2020	$	25,000	$	(579)	2.4535	%	One-month L	Mar-31-2022
Regions Bank	Jan-08-2015	Feb-14-2020	$	50,000	$	(1,181)	2.4750	%	One-month L	Mar-31-2022
Capital One, N.A.	Jan-08-2015	Feb-14-2020	$	50,000	$	(1,238)	2.5300	%	One-month L	Mar-31-2022
The Toronto-Dominion Bank	Jul-20-2017	Oct-30-2017	$	25,000	$	(362)	1.8485	%	One-month L	Jan-04-2023
Royal Bank of Canada	Jul-20-2017	Oct-30-2017	$	25,000	$	(364)	1.8505	%	One-month L	Jan-04-2023
Wells Fargo, N.A.	Jul-20-2017	Oct-30-2017	$	25,000	$	(364)	1.8505	%	One-month L	Jan-04-2023
PNC Bank, N.A.	Jul-20-2017	Oct-30-2017	$	25,000	$	(362)	1.8485	%	One-month L	Jan-04-2023
PNC Bank, N.A.	Jul-20-2017	Oct-30-2017	$	50,000	$	(723)	1.8475	%	One-month L	Jan-04-2023
The Toronto-Dominion Bank	Jul-24-2018	Jul-26-2019	$	50,000	$	(3,229)	2.9180	%	One-month L	Jan-12-2024
PNC Bank, N.A.	Jul-24-2018	Jul-26-2019	$	50,000	$	(3,232)	2.9190	%	One-month L	Jan-12-2024
Bank of Montreal	Jul-24-2018	Jul-26-2019	$	50,000	$	(3,232)	2.9190	%	One-month L	Jan-12-2024
U.S. Bank, N.A.	Jul-24-2018	Jul-26-2019	$	25,000	$	(1,616)	2.9190	%	One-month L	Jan-12-2024
Wells Fargo, N.A.	May-02-2019	Jul-15-2020	$	50,000	$	(2,030)	2.2460	%	One-month L	Jan-15-2025
U.S. Bank, N.A.	May-02-2019	Jul-15-2020	$	50,000	$	(2,029)	2.2459	%	One-month L	Jan-15-2025
Regions Bank	May-02-2019	Jul-15-2020	$	50,000	$	(2,032)	2.2459	%	One-month L	Jan-15-2025
Bank of Montreal	Jul-16-2019	Jul-15-2020	$	50,000	$	(886)	1.7165	%	One-month L	Jan-15-2025

Schedule of interest rate swaps

The following table summarizes the fair value of the interest rate swaps outstanding as of September 30, 2019 and December 31, 2018.

Balance Sheet Line Item (in thousands)	Notional Amount September 30, 2019		Fair Value September 30, 2019		Notional Amount December 31, 2018		Fair Value December 31, 2018
Interest rate swaps-Asset	$	250,000	$	488	$	600,000	$	9,151
Interest rate swaps-Liability	$	850,000	$	(24,812)	$	300,000	$	(4,011)

Schedule of the location in the financial statements of the gain or loss recognized on interest rate swaps

The following table summarizes the effect of cash flow hedge accounting and the location in the consolidated financial statements for the three and nine months ended September 30, 2019 and 2018.

	Three months ended September 30,				Nine months ended September 30,
Effect of Cash Flow Hedge Accounting (in thousands)	2019		2018		2019		2018
Income (loss) recognized in accumulated other comprehensive income (loss) on interest rate swaps	$	(5,913)	$	2,572	$	(26,715)	$	13,349
Income reclassified from accumulated other comprehensive income (loss) into income as interest expense	$	522	$	512	$	2,726	$	538
Total interest expense presented in the Consolidated Statements of Operations in which the effects of cash flow hedges are recorded	$	14,053	$	12,698	$	39,080	$	35,602

Schedule of financial instruments accounted for at fair value on a recurring basis

The following table summarizes the Company’s financial instruments that are accounted for at fair value on a recurring basis as of September 30, 2019 and December 31, 2018. 

			Fair Value Measurements as of September 30, 2019 Using
Balance Sheet Line Item (in thousands)	Fair Value September 30, 2019		Level 1		Level 2		Level 3
Interest rate swaps-Asset	$	488	$	—	$	488	$	—
Interest rate swaps-Liability	$	(24,812)	$	—	$	(24,812)	$	—

			Fair Value Measurements as ofDecember 31, 2018 Using
Balance Sheet Line Item (in thousands)	Fair Value December 31, 2018		Level 1		Level 2		Level 3
Interest rate swaps-Asset	$	9,151	$	—	$	9,151	$	—
Interest rate swaps-Liability	$	(4,011)	$	—	$	(4,011)	$	—

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Derivative Financial Instruments

9 Months Ended

Sep. 30, 2019

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Use of Derivative Financial Instruments

Derivative Financial Instruments

Risk Management Objective of Using Derivatives

The Company’s use of derivative instruments is limited to the utilization of interest rate swaps to manage interest rate risk exposure on existing and future liabilities and not for speculative purposes. The principal objective of such arrangements is to minimize the risks and related costs associated with the Company’s operating and financial structure.

The following table summarizes the Company’s outstanding interest rate swaps as of September 30, 2019. All of the Company’s interest rate swaps are designated as qualifying cash flow hedges.

Interest Rate Derivative Counterparty	Trade Date	Effective Date	Notional Amount (in thousands)		Fair Value (in thousands)		Pay Fixed Interest Rate		Receive Variable Interest Rate	Maturity Date
Regions Bank	Mar-01-2013	Mar-01-2013	$	25,000	$	51	1.3300	%	One-month L	Feb-14-2020
Capital One, N.A.	Jun-13-2013	Jul-01-2013	$	50,000	$	35	1.6810	%	One-month L	Feb-14-2020
Capital One, N.A.	Jun-13-2013	Aug-01-2013	$	25,000	$	16	1.7030	%	One-month L	Feb-14-2020
Regions Bank	Sep-30-2013	Feb-03-2014	$	25,000	$	(12)	1.9925	%	One-month L	Feb-14-2020
The Toronto-Dominion Bank	Oct-14-2015	Sep-29-2016	$	25,000	$	66	1.3830	%	One-month L	Sep-29-2020
PNC Bank, N.A.	Oct-14-2015	Sep-29-2016	$	50,000	$	128	1.3906	%	One-month L	Sep-29-2020
Regions Bank	Oct-14-2015	Sep-29-2016	$	35,000	$	91	1.3858	%	One-month L	Sep-29-2020
U.S. Bank, N.A.	Oct-14-2015	Sep-29-2016	$	25,000	$	63	1.3950	%	One-month L	Sep-29-2020
Capital One, N.A.	Oct-14-2015	Sep-29-2016	$	15,000	$	38	1.3950	%	One-month L	Sep-29-2020
Royal Bank of Canada	Jan-08-2015	Mar-20-2015	$	25,000	$	(56)	1.7090	%	One-month L	Mar-21-2021
The Toronto-Dominion Bank	Jan-08-2015	Mar-20-2015	$	25,000	$	(57)	1.7105	%	One-month L	Mar-21-2021
The Toronto-Dominion Bank	Jan-08-2015	Sep-10-2017	$	100,000	$	(982)	2.2255	%	One-month L	Mar-21-2021
Wells Fargo, N.A.	Jan-08-2015	Mar-20-2015	$	25,000	$	(246)	1.8280	%	One-month L	Mar-31-2022
The Toronto-Dominion Bank	Jan-08-2015	Feb-14-2020	$	25,000	$	(579)	2.4535	%	One-month L	Mar-31-2022
Regions Bank	Jan-08-2015	Feb-14-2020	$	50,000	$	(1,181)	2.4750	%	One-month L	Mar-31-2022
Capital One, N.A.	Jan-08-2015	Feb-14-2020	$	50,000	$	(1,238)	2.5300	%	One-month L	Mar-31-2022
The Toronto-Dominion Bank	Jul-20-2017	Oct-30-2017	$	25,000	$	(362)	1.8485	%	One-month L	Jan-04-2023
Royal Bank of Canada	Jul-20-2017	Oct-30-2017	$	25,000	$	(364)	1.8505	%	One-month L	Jan-04-2023
Wells Fargo, N.A.	Jul-20-2017	Oct-30-2017	$	25,000	$	(364)	1.8505	%	One-month L	Jan-04-2023
PNC Bank, N.A.	Jul-20-2017	Oct-30-2017	$	25,000	$	(362)	1.8485	%	One-month L	Jan-04-2023
PNC Bank, N.A.	Jul-20-2017	Oct-30-2017	$	50,000	$	(723)	1.8475	%	One-month L	Jan-04-2023
The Toronto-Dominion Bank	Jul-24-2018	Jul-26-2019	$	50,000	$	(3,229)	2.9180	%	One-month L	Jan-12-2024
PNC Bank, N.A.	Jul-24-2018	Jul-26-2019	$	50,000	$	(3,232)	2.9190	%	One-month L	Jan-12-2024
Bank of Montreal	Jul-24-2018	Jul-26-2019	$	50,000	$	(3,232)	2.9190	%	One-month L	Jan-12-2024
U.S. Bank, N.A.	Jul-24-2018	Jul-26-2019	$	25,000	$	(1,616)	2.9190	%	One-month L	Jan-12-2024
Wells Fargo, N.A.	May-02-2019	Jul-15-2020	$	50,000	$	(2,030)	2.2460	%	One-month L	Jan-15-2025
U.S. Bank, N.A.	May-02-2019	Jul-15-2020	$	50,000	$	(2,029)	2.2459	%	One-month L	Jan-15-2025
Regions Bank	May-02-2019	Jul-15-2020	$	50,000	$	(2,032)	2.2459	%	One-month L	Jan-15-2025
Bank of Montreal	Jul-16-2019	Jul-15-2020	$	50,000	$	(886)	1.7165	%	One-month L	Jan-15-2025

The following table summarizes the fair value of the interest rate swaps outstanding as of September 30, 2019 and December 31, 2018.

Balance Sheet Line Item (in thousands)	Notional Amount September 30, 2019		Fair Value September 30, 2019		Notional Amount December 31, 2018		Fair Value December 31, 2018
Interest rate swaps-Asset	$	250,000	$	488	$	600,000	$	9,151
Interest rate swaps-Liability	$	850,000	$	(24,812)	$	300,000	$	(4,011)

Cash Flow Hedges of Interest Rate Risk

The Company’s objectives in using interest rate swaps are to add stability to interest expense and to manage its exposure to interest rate movements. 

For derivatives designated and that qualify as cash flow hedges of interest rate risk, the gain or loss on the derivative is recorded in accumulated other comprehensive income (loss) and subsequently reclassified into interest expense in the same periods during which the hedged transaction affects earnings.

Amounts reported in accumulated other comprehensive income (loss) related to derivatives designated as qualifying cash flow hedges will be reclassified to interest expense as interest payments are made on the Company’s variable rate debt. The Company estimates that approximately $3.8 million will be reclassified from accumulated other comprehensive income (loss) as an increase to interest expense over the next 12 months.

The following table summarizes the effect of cash flow hedge accounting and the location in the consolidated financial statements for the three and nine months ended September 30, 2019 and 2018.

	Three months ended September 30,				Nine months ended September 30,
Effect of Cash Flow Hedge Accounting (in thousands)	2019		2018		2019		2018
Income (loss) recognized in accumulated other comprehensive income (loss) on interest rate swaps	$	(5,913)	$	2,572	$	(26,715)	$	13,349
Income reclassified from accumulated other comprehensive income (loss) into income as interest expense	$	522	$	512	$	2,726	$	538
Total interest expense presented in the Consolidated Statements of Operations in which the effects of cash flow hedges are recorded	$	14,053	$	12,698	$	39,080	$	35,602

Credit-risk-related Contingent Features

The Company has agreements with each of its derivative counterparties that contain a provision where the Company could be declared in default on its derivative obligations if repayment of the underlying indebtedness is accelerated by the lender due to the Company’s default on the indebtedness.

As of September 30, 2019, the Company had not breached the provisions of these agreements and had not posted any collateral related to these agreements. If the Company had breached any of these provisions at September 30, 2019, it could have been required to settle its obligations under the agreement of the interest rate swaps in a net liability position by counterparty plus accrued interest for approximately $24.6 million.

Fair Value of Interest Rate Swaps

The Company’s valuation of the interest rate swaps 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 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.

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 itself and its counterparties. However, as of September 30, 2019 and December 31, 2018, the Company has assessed the significance of the impact of the credit valuation adjustments on the overall valuation of its derivative positions and has determined that the credit valuation adjustments are not significant to the overall valuation of its derivatives. As a result, the Company has determined that its derivative valuations in their entirety are classified in Level 2 of the fair value hierarchy.

The following table summarizes the Company’s financial instruments that are accounted for at fair value on a recurring basis as of September 30, 2019 and December 31, 2018. 

			Fair Value Measurements as of September 30, 2019 Using
Balance Sheet Line Item (in thousands)	Fair Value September 30, 2019		Level 1		Level 2		Level 3
Interest rate swaps-Asset	$	488	$	—	$	488	$	—
Interest rate swaps-Liability	$	(24,812)	$	—	$	(24,812)	$	—

			Fair Value Measurements as ofDecember 31, 2018 Using
Balance Sheet Line Item (in thousands)	Fair Value December 31, 2018		Level 1		Level 2		Level 3
Interest rate swaps-Asset	$	9,151	$	—	$	9,151	$	—
Interest rate swaps-Liability	$	(4,011)	$	—	$	(4,011)	$	—

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Leases

9 Months Ended

Sep. 30, 2019

Leases [Abstract]

Leases

Leases

Lessor Leases

The Company has operating leases in which it is the lessor for its rental property. Certain leases contain variable lease payments based upon changes in the Consumer Price Index (“CPI”). Certain leases contain options to renew or terminate the lease, and options for the lessee to purchase the rental property, all of which are predominately at the sole discretion of the lessee.

The following table summarizes the components of rental income recognized during the three and nine months ended September 30, 2019 included in the accompanying Consolidated Statements of Operations.

	Three months ended September 30,		Nine months ended September 30,
Rental Income (in thousands)	2019		2019
Fixed lease payments	$	80,262	$	227,337
Variable lease payments	20,189		61,628
Straight-line rental income	3,091		8,667
Net decrease to rental income related to above and below market lease amortization	(1,248)		(3,361)
Total rental income	$	102,294	$	294,271

As of September 30, 2019, the Company had accrued rental income of approximately $40.2 million included in tenant accounts receivable on the accompanying Consolidated Balance Sheets. As of December 31, 2018, the Company had accrued rental income of approximately $32.4 million, net of allowance for doubtful accounts of approximately $0.8 million, included in tenant accounts receivable on the accompanying Consolidated Balance Sheets.

As of September 30, 2019 and December 31, 2018, the Company had approximately $20.5 million and $18.3 million, respectively, of total lease security deposits available in the form of existing letters of credit, which are not reflected on the accompanying Consolidated Balance Sheets. As of September 30, 2019 and December 31, 2018, the Company had approximately $0.7 million and $0.7 million, respectively, of lease security deposits available in cash, which are included in restricted cash on the accompanying Consolidated Balance Sheets. The Company’s remaining lease security deposits are commingled in cash and cash equivalents. These funds may be used to settle tenant accounts receivables in the event of a default under the related lease. As of September 30, 2019 and December 31, 2018, the Company’s total liability associated with these lease security deposits was approximately $9.2 million and $8.4 million, respectively, and is included in tenant prepaid rent and security deposits on the accompanying Consolidated Balance Sheets.

The Company estimates that billings for real estate taxes, which are the responsibility of certain tenants under the terms of their leases and are not reflected on the Company’s consolidated financial statements, was approximately $5.1 million, $13.1 million, $3.8 million and $10.9 million for the three and nine months ended September 30, 2019 and 2018, respectively. These amounts would have been the maximum real estate tax expense of the Company, excluding any penalties or interest, had the tenants not met their contractual obligations for these periods.

The following table summarizes the maturity of fixed lease payments under the Company’s leases as of September 30, 2019.

Year (as of September 30, 2019)	Maturity of Fixed Lease Payments (in thousands)
Remainder of 2019	$	82,584
2020	$	325,907
2021	$	285,414
2022	$	249,287
2023	$	208,011
Thereafter	$	761,469

The following table summarizes the minimum contractual lease payments under the superseded leases standard, Topic 840, as of December 31, 2018.

Year (as of December 31, 2018)	Future Minimum Rents (in thousands)
2019	$	299,978
2020	$	271,936
2021	$	226,970
2022	$	188,707
2023	$	152,814
Thereafter	$	535,192

Lessee Leases

The Company has operating leases in which it is the lessee for ground leases and its corporate office lease. These leases have remaining lease terms of approximately 1.5 years to 47.3 years. Certain ground leases contain options to extend the leases for ten years to 20 years, all of which are reasonably certain to be exercised, and are included in the computation of the Company’s right-of-use assets and operating lease liabilities.

The following table summarizes supplemental information related to operating lease right-of-use assets and operating lease liabilities recognized in the Company’s Consolidated Balance Sheets as of September 30, 2019.

Operating Lease Term and Discount Rate	September 30, 2019
Weighted average remaining lease term (years)	35.7
Weighted average discount rate	7.1	%

The following table summarizes the operating lease cost recognized during the three and nine months ended September 30, 2019 included in the Company’s Consolidated Statements of Operations.

	Three months ended September 30,		Nine months ended September 30,
Operating Lease Cost (in thousands)	2019		2019
Operating lease cost included in property expense attributable to ground leases	$	331	$	993
Operating lease cost included in general and administrative expense attributable to corporate office lease	266		799
Total operating lease cost	$	597	$	1,792

The following table summarizes supplemental cash flow information related to operating leases recognized during the nine months ended September 30, 2019 in the Company’s Consolidated Statements of Cash Flows.

	Nine months ended September 30,
Operating Leases (in thousands)	2019
Cash paid for amounts included in the measurement of lease liabilities (operating cash flows)	$	1,711

The following table summarizes the maturity of operating lease liabilities under the Company’s ground leases and corporate office lease as of September 30, 2019.

Year (as of September 30, 2019)	Maturity of Operating Lease Liabilities(1) (in thousands)
Remainder of 2019	$	571
2020	2,294
2021	1,400
2022	1,107
2023	1,116
Thereafter	48,155
Total lease payments	54,643
Less: Imputed interest	(37,384)
Present value of operating lease liabilities	$	17,259

(1)Operating lease liabilities do not include estimates of CPI rent changes required by certain ground lease agreements. Therefore, actual payments may differ than those presented.

The following table summarizes the minimum contractual lease payments under the superseded leases standard, Topic 840, as of December 31, 2018.

Year (as of December 31, 2018)	Future Minimum Rental Payments (1) (in thousands)
2019	$	2,110
2020	$	2,122
2021	$	1,227
2022	$	935
2023	$	944
Thereafter	$	45,580

(1)Future minimum rental payments do not include estimates of CPI rent changes required by certain lease agreements. Therefore, actual minimum rental payments may differ than those presented.

Leases

Leases

Lessor Leases

The Company has operating leases in which it is the lessor for its rental property. Certain leases contain variable lease payments based upon changes in the Consumer Price Index (“CPI”). Certain leases contain options to renew or terminate the lease, and options for the lessee to purchase the rental property, all of which are predominately at the sole discretion of the lessee.

The following table summarizes the components of rental income recognized during the three and nine months ended September 30, 2019 included in the accompanying Consolidated Statements of Operations.

	Three months ended September 30,		Nine months ended September 30,
Rental Income (in thousands)	2019		2019
Fixed lease payments	$	80,262	$	227,337
Variable lease payments	20,189		61,628
Straight-line rental income	3,091		8,667
Net decrease to rental income related to above and below market lease amortization	(1,248)		(3,361)
Total rental income	$	102,294	$	294,271

As of September 30, 2019, the Company had accrued rental income of approximately $40.2 million included in tenant accounts receivable on the accompanying Consolidated Balance Sheets. As of December 31, 2018, the Company had accrued rental income of approximately $32.4 million, net of allowance for doubtful accounts of approximately $0.8 million, included in tenant accounts receivable on the accompanying Consolidated Balance Sheets.

As of September 30, 2019 and December 31, 2018, the Company had approximately $20.5 million and $18.3 million, respectively, of total lease security deposits available in the form of existing letters of credit, which are not reflected on the accompanying Consolidated Balance Sheets. As of September 30, 2019 and December 31, 2018, the Company had approximately $0.7 million and $0.7 million, respectively, of lease security deposits available in cash, which are included in restricted cash on the accompanying Consolidated Balance Sheets. The Company’s remaining lease security deposits are commingled in cash and cash equivalents. These funds may be used to settle tenant accounts receivables in the event of a default under the related lease. As of September 30, 2019 and December 31, 2018, the Company’s total liability associated with these lease security deposits was approximately $9.2 million and $8.4 million, respectively, and is included in tenant prepaid rent and security deposits on the accompanying Consolidated Balance Sheets.

The Company estimates that billings for real estate taxes, which are the responsibility of certain tenants under the terms of their leases and are not reflected on the Company’s consolidated financial statements, was approximately $5.1 million, $13.1 million, $3.8 million and $10.9 million for the three and nine months ended September 30, 2019 and 2018, respectively. These amounts would have been the maximum real estate tax expense of the Company, excluding any penalties or interest, had the tenants not met their contractual obligations for these periods.

The following table summarizes the maturity of fixed lease payments under the Company’s leases as of September 30, 2019.

Year (as of September 30, 2019)	Maturity of Fixed Lease Payments (in thousands)
Remainder of 2019	$	82,584
2020	$	325,907
2021	$	285,414
2022	$	249,287
2023	$	208,011
Thereafter	$	761,469

The following table summarizes the minimum contractual lease payments under the superseded leases standard, Topic 840, as of December 31, 2018.

Year (as of December 31, 2018)	Future Minimum Rents (in thousands)
2019	$	299,978
2020	$	271,936
2021	$	226,970
2022	$	188,707
2023	$	152,814
Thereafter	$	535,192

Lessee Leases

The Company has operating leases in which it is the lessee for ground leases and its corporate office lease. These leases have remaining lease terms of approximately 1.5 years to 47.3 years. Certain ground leases contain options to extend the leases for ten years to 20 years, all of which are reasonably certain to be exercised, and are included in the computation of the Company’s right-of-use assets and operating lease liabilities.

The following table summarizes supplemental information related to operating lease right-of-use assets and operating lease liabilities recognized in the Company’s Consolidated Balance Sheets as of September 30, 2019.

Operating Lease Term and Discount Rate	September 30, 2019
Weighted average remaining lease term (years)	35.7
Weighted average discount rate	7.1	%

The following table summarizes the operating lease cost recognized during the three and nine months ended September 30, 2019 included in the Company’s Consolidated Statements of Operations.

	Three months ended September 30,		Nine months ended September 30,
Operating Lease Cost (in thousands)	2019		2019
Operating lease cost included in property expense attributable to ground leases	$	331	$	993
Operating lease cost included in general and administrative expense attributable to corporate office lease	266		799
Total operating lease cost	$	597	$	1,792

The following table summarizes supplemental cash flow information related to operating leases recognized during the nine months ended September 30, 2019 in the Company’s Consolidated Statements of Cash Flows.

	Nine months ended September 30,
Operating Leases (in thousands)	2019
Cash paid for amounts included in the measurement of lease liabilities (operating cash flows)	$	1,711

The following table summarizes the maturity of operating lease liabilities under the Company’s ground leases and corporate office lease as of September 30, 2019.

Year (as of September 30, 2019)	Maturity of Operating Lease Liabilities(1) (in thousands)
Remainder of 2019	$	571
2020	2,294
2021	1,400
2022	1,107
2023	1,116
Thereafter	48,155
Total lease payments	54,643
Less: Imputed interest	(37,384)
Present value of operating lease liabilities	$	17,259

(1)Operating lease liabilities do not include estimates of CPI rent changes required by certain ground lease agreements. Therefore, actual payments may differ than those presented.

The following table summarizes the minimum contractual lease payments under the superseded leases standard, Topic 840, as of December 31, 2018.

Year (as of December 31, 2018)	Future Minimum Rental Payments (1) (in thousands)
2019	$	2,110
2020	$	2,122
2021	$	1,227
2022	$	935
2023	$	944
Thereafter	$	45,580

(1)Future minimum rental payments do not include estimates of CPI rent changes required by certain lease agreements. Therefore, actual minimum rental payments may differ than those presented.

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Rental Property - Acquisitions (Details) $ in Thousands	3 Months Ended			9 Months Ended
	Sep. 30, 2019 USD ($) ft² building	Jun. 30, 2019 USD ($) ft² building	Mar. 31, 2019 USD ($) ft² building	Sep. 30, 2019 USD ($) ft² building
Business Acquisition [Line Items]
Area (in square feet)	86,000,000.0			86,000,000.0
Acquisitions 2019 [Member]
Business Acquisition [Line Items]
Area (in square feet)	10,131,815			10,131,815
Number of Buildings Acquired | building				46
Business Combination, Consideration Transferred | $				$ 748,088
Acquisitions Q1 2019
Business Acquisition [Line Items]
Area (in square feet)			2,363,623
Number of Buildings Acquired | building			10
Business Combination, Consideration Transferred | $			$ 185,363
Florence, KY, 1-24-19 [Member]
Business Acquisition [Line Items]
Area (in square feet)			176,000
Number of Buildings Acquired | building			1
Business Combination, Consideration Transferred | $			$ 9,965
Burgettstown, PA, 2-21-19 [Member]
Business Acquisition [Line Items]
Area (in square feet)			455,000
Number of Buildings Acquired | building			1
Business Combination, Consideration Transferred | $			$ 28,676
Taunton, MA, 2-21-19 [Member]
Business Acquisition [Line Items]
Area (in square feet)			349,870
Number of Buildings Acquired | building			1
Business Combination, Consideration Transferred | $			$ 26,483
Blaine, MN, 2-28-19 [Member]
Business Acquisition [Line Items]
Area (in square feet)			248,816
Number of Buildings Acquired | building			1
Business Combination, Consideration Transferred | $			$ 21,955
Piedmont, SC, 3-7-19 [Member]
Business Acquisition [Line Items]
Area (in square feet)			331,845
Number of Buildings Acquired | building			1
Business Combination, Consideration Transferred | $			$ 24,536
York, PA, 3-7-19 [Member]
Business Acquisition [Line Items]
Area (in square feet)			148,300
Number of Buildings Acquired | building			1
Business Combination, Consideration Transferred | $			$ 10,546
Omaha, NE, 3-11-19 [Member]
Business Acquisition [Line Items]
Area (in square feet)			237,632
Number of Buildings Acquired | building			1
Business Combination, Consideration Transferred | $			$ 20,005
Humble, TX, 3-28-19 [Member]
Business Acquisition [Line Items]
Area (in square feet)			132,000
Number of Buildings Acquired | building			1
Business Combination, Consideration Transferred | $			$ 17,307
Elkridge, MD, 3-28-19 [Member]
Business Acquisition [Line Items]
Area (in square feet)			167,410
Number of Buildings Acquired | building			1
Business Combination, Consideration Transferred | $			$ 13,648
Houston, TX, 3-28-19 [Member]
Business Acquisition [Line Items]
Area (in square feet)			116,750
Number of Buildings Acquired | building			1
Business Combination, Consideration Transferred | $			$ 12,242
Acquisitions Q2 2019
Business Acquisition [Line Items]
Area (in square feet)		3,029,812
Number of Buildings Acquired | building		14
Business Combination, Consideration Transferred | $		$ 260,158
Oakdale, MN, 4-2-19 [Member]
Business Acquisition [Line Items]
Area (in square feet)		100,600
Number of Buildings Acquired | building		1
Business Combination, Consideration Transferred | $		$ 9,045
Zeeland, MI, 4-8-19 [Member]
Business Acquisition [Line Items]
Area (in square feet)		230,200
Number of Buildings Acquired | building		1
Business Combination, Consideration Transferred | $		$ 15,786
Mocksville, NC, 4-12-19 [Member]
Business Acquisition [Line Items]
Area (in square feet)		129,600
Number of Buildings Acquired | building		1
Business Combination, Consideration Transferred | $		$ 7,771
Spartanburg, SC, 4-25-19 [Member]
Business Acquisition [Line Items]
Area (in square feet)		319,660
Number of Buildings Acquired | building		2
Business Combination, Consideration Transferred | $		$ 15,432
Goose Creek, SC, 4-29-19 [Member]
Business Acquisition [Line Items]
Area (in square feet)		500,355
Number of Buildings Acquired | building		1
Business Combination, Consideration Transferred | $		$ 40,522
Houston, TX, 4-29-19 [Member]
Business Acquisition [Line Items]
Area (in square feet)		128,136
Number of Buildings Acquired | building		1
Business Combination, Consideration Transferred | $		$ 13,649
N. Chesterfield, VA, 5-16-19 [Member]
Business Acquisition [Line Items]
Area (in square feet)		109,520
Number of Buildings Acquired | building		1
Business Combination, Consideration Transferred | $		$ 9,467
Laredo, TX, 6-6-19 [Member]
Business Acquisition [Line Items]
Area (in square feet)		213,982
Number of Buildings Acquired | building		1
Business Combination, Consideration Transferred | $		$ 18,972
Baton Rouge, LA, 6-18-19 [Member]
Business Acquisition [Line Items]
Area (in square feet)		252,800
Number of Buildings Acquired | building		2
Business Combination, Consideration Transferred | $		$ 20,041
Moorestown, NJ, 6-19-19 [Member]
Business Acquisition [Line Items]
Area (in square feet)		187,569
Number of Buildings Acquired | building		2
Business Combination, Consideration Transferred | $		$ 13,645
West Jefferson, OH, 6-28-19 [Member]
Business Acquisition [Line Items]
Area (in square feet)		857,390
Number of Buildings Acquired | building		1
Business Combination, Consideration Transferred | $		$ 95,828
Acquisitions Q3 2019
Business Acquisition [Line Items]
Area (in square feet)	4,738,380			4,738,380
Number of Buildings Acquired | building	22
Business Combination, Consideration Transferred | $	$ 302,567
Lenexa, KS, 7-10-19
Business Acquisition [Line Items]
Area (in square feet)	304,840			304,840
Number of Buildings Acquired | building	1
Business Combination, Consideration Transferred | $	$ 13,450
Katy, TX, 7-22-19
Business Acquisition [Line Items]
Area (in square feet)	199,903			199,903
Number of Buildings Acquired | building	1
Business Combination, Consideration Transferred | $	$ 11,287
Summerville, SC, 7-22-19
Business Acquisition [Line Items]
Area (in square feet)	88,583			88,583
Number of Buildings Acquired | building	1
Business Combination, Consideration Transferred | $	$ 7,166
Tampa, FL, 8-5-19
Business Acquisition [Line Items]
Area (in square feet)	78,560			78,560
Number of Buildings Acquired | building	1
Business Combination, Consideration Transferred | $	$ 8,168
Lumberton, NJ, 8-6-19
Business Acquisition [Line Items]
Area (in square feet)	120,000			120,000
Number of Buildings Acquired | building	1
Business Combination, Consideration Transferred | $	$ 10,880
Delavan, WI, 8-16-19
Business Acquisition [Line Items]
Area (in square feet)	224,940			224,940
Number of Buildings Acquired | building	3
Business Combination, Consideration Transferred | $	$ 13,981
Katy, TX, 8-19-19
Business Acquisition [Line Items]
Area (in square feet)	45,000			45,000
Number of Buildings Acquired | building	1
Business Combination, Consideration Transferred | $	$ 6,190
Kentwood, MI, 8-19-19
Business Acquisition [Line Items]
Area (in square feet)	210,120			210,120
Number of Buildings Acquired | building	1
Business Combination, Consideration Transferred | $	$ 10,407
New Galilee, PA, 8-21-19
Business Acquisition [Line Items]
Area (in square feet)	410,389			410,389
Number of Buildings Acquired | building	1
Business Combination, Consideration Transferred | $	$ 31,219
Middleborough, MA, 8-22-19
Business Acquisition [Line Items]
Area (in square feet)	80,100			80,100
Number of Buildings Acquired | building	1
Business Combination, Consideration Transferred | $	$ 14,253
Paradise, NV, 8-27-19
Business Acquisition [Line Items]
Area (in square feet)	80,422			80,422
Number of Buildings Acquired | building	2
Business Combination, Consideration Transferred | $	$ 12,602
Lebanon, TN, 8-29-19
Business Acquisition [Line Items]
Area (in square feet)	348,880			348,880
Number of Buildings Acquired | building	1
Business Combination, Consideration Transferred | $	$ 20,267
West Columbia, SC, 8-30-19
Business Acquisition [Line Items]
Area (in square feet)	200,000			200,000
Number of Buildings Acquired | building	1
Business Combination, Consideration Transferred | $	$ 13,670
Export, PA, 9-6-19
Business Acquisition [Line Items]
Area (in square feet)	138,270			138,270
Number of Buildings Acquired | building	1
Business Combination, Consideration Transferred | $	$ 9,323
Omaha, NE, 9-11-19
Business Acquisition [Line Items]
Area (in square feet)	128,200			128,200
Number of Buildings Acquired | building	2
Business Combination, Consideration Transferred | $	$ 8,509
Imperial, PA, 9-16-19
Business Acquisition [Line Items]
Area (in square feet)	315,634			315,634
Number of Buildings Acquired | building	1
Business Combination, Consideration Transferred | $	$ 28,712
Memphis, TN, 9-19-19
Business Acquisition [Line Items]
Area (in square feet)	1,135,453			1,135,453
Number of Buildings Acquired | building	1
Business Combination, Consideration Transferred | $	$ 50,941
Memphis, TN, 9-26-19
Business Acquisition [Line Items]
Area (in square feet)	629,086			629,086
Number of Buildings Acquired | building	1
Business Combination, Consideration Transferred | $	$ 31,542

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Summary of Significant Accounting Policies - New Accounting Pronouncements (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Jan. 01, 2019	Dec. 31, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating lease right-of-use assets	$ 15,425		$ 0
Operating lease liabilities	$ 17,259		$ 0
Accounting Standards Update 2016-02 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Increase to cumulative dividends in excess of earnings due to new accounting principle in period of adoption		$ (200)
Operating lease right-of-use assets		16,300
Operating lease liabilities		$ 18,000

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Rental Property - Loss on Impairments (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019 USD ($) building Rate	Mar. 31, 2019 USD ($) building Rate	Sep. 30, 2019 USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Impairment of Real Estate			$ 9,757
Fair Value, Inputs, Level 3 [Member] | Income Approach Valuation Technique
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Property, Plant, and Equipment, Fair Value Disclosure	$ 10,323		10,323
Fair Value Inputs, Discount Rates | Rate	13.00%	12.00%
Fair Value Inputs Exit Capitalization Rate | Rate	12.00%	12.00%
Rapid City, SD, Q4 2007
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of Buildings Impaired | building		1
Impairment of Real Estate		$ 5,344
Rapid City, SD, Q4 2007 | Fair Value, Inputs, Level 3 [Member] | Income Approach Valuation Technique
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Property, Plant, and Equipment, Fair Value Disclosure		$ 4,373
Belfast, ME, Q4 2008
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of Buildings Impaired | building	5
Impairment of Real Estate	$ 4,413
Belfast, ME, Q4 2008 | Fair Value, Inputs, Level 3 [Member] | Income Approach Valuation Technique
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Property, Plant, and Equipment, Fair Value Disclosure	$ 5,950		$ 5,950

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Leases - Rental Income (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Leases [Abstract]
Fixed lease payments	$ 80,262		$ 227,337
Variable lease payments	20,189		61,628
Straight-line rental income	3,091		8,667
Net decrease to rental income related to above and below market lease amortization	(1,248)	$ (1,150)	(3,361)	$ (3,206)
Rental income	$ 102,294	$ 88,677	$ 294,271	$ 256,670

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Equity - Common Stock Dividends (Details) - $ / shares		1 Months Ended																					9 Months Ended	12 Months Ended
	Oct. 15, 2019	Sep. 30, 2019	Aug. 31, 2019	Jul. 31, 2019	Jun. 30, 2019	May 31, 2019	Apr. 30, 2019	Mar. 31, 2019	Feb. 28, 2019	Jan. 31, 2019	Dec. 31, 2018	Nov. 30, 2018	Oct. 31, 2018	Sep. 30, 2018	Aug. 31, 2018	Jul. 31, 2018	Jun. 30, 2018	May 31, 2018	Apr. 30, 2018	Mar. 31, 2018	Feb. 28, 2018	Jan. 31, 2018	Sep. 30, 2019	Dec. 31, 2018
Class of Stock [Line Items]
Common stock, shares authorized		300,000,000					300,000,000	150,000,000			150,000,000												300,000,000	150,000,000
Common Stock, Dividends, Per Share, Cash Paid		$ 0.119167	$ 0.119167	$ 0.119167	$ 0.119167	$ 0.119167	$ 0.119167	$ 0.119167	$ 0.119167	$ 0.119167	$ 0.118333	$ 0.118333	$ 0.118333	$ 0.118333	$ 0.118333	$ 0.118333	$ 0.118333	$ 0.118333	$ 0.118333	$ 0.118333	$ 0.118333	$ 0.118333	$ 1.072503	$ 1.419996
Common Stock, Dividends, Per Share, Declared		$ 0.119167	$ 0.119167	$ 0.119167	$ 0.119167	$ 0.119167	$ 0.119167	$ 0.119167	$ 0.119167	$ 0.119167	$ 0.118333	$ 0.118333	$ 0.118333	$ 0.118333	$ 0.118333	$ 0.118333	$ 0.118333	$ 0.118333	$ 0.118333	$ 0.118333	$ 0.118333	$ 0.118333	$ 1.072503	$ 1.419996
Subsequent Event [Member]
Class of Stock [Line Items]
Common Stock, Dividends, Per Share, Declared	$ 0.119167
Common Stock
Class of Stock [Line Items]
Dividends Payable, Date Declared		Jul. 15, 2019	Jul. 15, 2019	Jul. 15, 2019	Apr. 09, 2019	Apr. 09, 2019	Apr. 09, 2019	Jan. 10, 2019	Jan. 10, 2019	Jan. 10, 2019	Oct. 10, 2018	Oct. 10, 2018	Oct. 10, 2018	Jul. 11, 2018	Jul. 11, 2018	Jul. 11, 2018	Apr. 10, 2018	Apr. 10, 2018	Apr. 10, 2018	Nov. 02, 2017	Nov. 02, 2017	Nov. 02, 2017
Dividends Payable, Date to be Paid		Oct. 15, 2019	Sep. 16, 2019	Aug. 15, 2019	Jul. 15, 2019	Jun. 17, 2019	May 15, 2019	Apr. 15, 2019	Mar. 15, 2019	Feb. 15, 2019	Jan. 15, 2019	Dec. 17, 2018	Nov. 15, 2018	Oct. 15, 2018	Sep. 17, 2018	Aug. 15, 2018	Jul. 16, 2018	Jun. 15, 2018	May 15, 2018	Apr. 16, 2018	Mar. 15, 2018	Feb. 15, 2018

XML

Noncontrolling Interest - LTIP Units (Details) - LTIP Units - USD ($) $ in Thousands		3 Months Ended		9 Months Ended		12 Months Ended
	Jan. 07, 2019	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018
Units
Unvested at beginning of period (in shares)				251,216	300,307	300,307
Granted	154,649			364,173		324,802
Vested (in units)		(29,989)	(30,949)	(234,330)	(342,940)	(373,893)
Forfeited (in units)				(10,208)		0
Unvested at end of period (in shares)		370,851		370,851		251,216
Unrecognized compensation costs		$ 5,500		$ 5,500
Unrecognized compensation costs, period for recognition				2 years 3 months 18 days
Vested (in units)		29,989	30,949	234,330	342,940	373,893
Fair value of units vested		$ 884	$ 851	$ 6,348	$ 9,002