10-Q

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

____________________________________________________________________________

FORM 10-Q

____________________________________________________________________________

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

For the Quarterly Period Ended September 30, 2018

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 incorporation or organization)	(IRS Employer Identification No.)
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)

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

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

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 x	Accelerated filer ¨
Non-accelerated filer ¨	Smaller reporting company ¨
(Do not check if a 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 x

Indicate the number of shares outstanding of each of the issuer’s classes of common and preferred stock as of the latest practicable date.

Class	Outstanding at October 31, 2018
Common Stock ($0.01 par value)	108,893,286
6.875% Series C Cumulative Redeemable Preferred Stock ($0.01 par value)	3,000,000

STAG INDUSTRIAL, INC.

Table of Contents 

PART I.	Financial Information	3
Item 1.	Financial Statements (unaudited)	3
	Consolidated Balance Sheets as of September 30, 2018 and December 31, 2017	3
	Consolidated Statements of Operations for the Three and Nine Months Ended September 30, 2018 and 2017	4
	Consolidated Statements of Comprehensive Income for the Three and Nine Months Ended September 30, 2018 and 2017	5
	Consolidated Statements of Equity for the Nine Months Ended September 30, 2018 and 2017	6
	Consolidated Statements of Cash Flows for the Nine Months Ended September 30, 2018 and 2017	7
	Notes to Consolidated Financial Statements	8
Item 2.	Management’s Discussion and Analysis of Financial Condition and Results of Operations	26
Item 3.	Quantitative and Qualitative Disclosures about Market Risk	47
Item 4.	Controls and Procedures	48
PART II.	Other Information	49
Item 1.	Legal Proceedings	49
Item 1A.	Risk Factors	49
Item 2.	Unregistered Sales of Equity Securities and Use of Proceeds	49
Item 3.	Defaults Upon Senior Securities	49
Item 4.	Mine Safety Disclosures	49
Item 5.	Other Information	49
Item 6.	Exhibits	50
	SIGNATURES	51

2

Part I. Financial Information

Item 1.  Financial Statements

STAG Industrial, Inc.

Consolidated Balance Sheets

(unaudited, in thousands, except share data)

	September 30, 2018			December 31, 2017
Assets
Rental Property:
Land	$	355,590		$	321,560
Buildings and improvements, net of accumulated depreciation of $301,787 and $249,057, respectively	2,202,755			1,932,764
Deferred leasing intangibles, net of accumulated amortization of $237,892 and $280,642, respectively	327,734			313,253
Total rental property, net	2,886,079			2,567,577
Cash and cash equivalents	6,024			24,562
Restricted cash	5,231			3,567
Tenant accounts receivable, net	39,170			33,602
Prepaid expenses and other assets	35,122			25,364
Interest rate swaps	17,649			6,079
Assets held for sale, net	—			19,916
Total assets	$	2,989,275		$	2,680,667
Liabilities and Equity
Liabilities:
Unsecured credit facility	$	95,000		$	271,000
Unsecured term loans, net	596,085			446,265
Unsecured notes, net	572,389			398,234
Mortgage notes, net	56,993			58,282
Accounts payable, accrued expenses and other liabilities	53,445			43,216
Interest rate swaps	—			1,217
Tenant prepaid rent and security deposits	19,328			19,045
Dividends and distributions payable	14,530			11,880
Deferred leasing intangibles, net of accumulated amortization of $13,043 and $13,555, respectively	20,708			21,221
Total liabilities	1,428,478			1,270,360
Commitments and contingencies (Note 10)
Equity:
Preferred stock, par value $0.01 per share, 15,000,000 shares authorized,
Series B, -0- and 2,800,000 shares (liquidation preference of $25.00 per share) issued and outstanding at September 30, 2018 and December 31, 2017, respectively	—			70,000
Series C, 3,000,000 shares (liquidation preference of $25.00 per share) issued and outstanding at September 30, 2018 and December 31, 2017	75,000			75,000
Common stock, par value $0.01 per share, 150,000,000 shares authorized, 107,825,791 and 97,012,543 shares issued and outstanding at September 30, 2018 and December 31, 2017, respectively	1,078			970
Additional paid-in capital	2,003,983			1,725,825
Cumulative dividends in excess of earnings	(589,785		)	(516,691		)
Accumulated other comprehensive income	16,485			3,936
Total stockholders’ equity	1,506,761			1,359,040
Noncontrolling interest	54,036			51,267
Total equity	1,560,797			1,410,307
Total liabilities and equity	$	2,989,275		$	2,680,667

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,
	2018			2017			2018			2017
Revenue
Rental income	$	75,159		$	65,673		$	217,227		$	186,621
Tenant recoveries	13,518			12,366			39,443			32,952
Other income	269			105			1,033			244
Total revenue	88,946			78,144			257,703			219,817
Expenses
Property	17,112			15,401			50,735			42,312
General and administrative	8,911			8,380			25,637			25,090
Property acquisition costs	—			1,386			—			4,684
Depreciation and amortization	44,355			38,186			125,221			110,286
Loss on impairments	—			—			2,934			—
Loss on involuntary conversion	—			—			—			330
Other expenses	223			58			864			1,502
Total expenses	70,601			63,411			205,391			184,204
Other income (expense)
Interest and other income	3			2			16			10
Interest expense	(12,698		)	(10,446		)	(35,602		)	(31,557		)
Loss on extinguishment of debt	(13		)	(13		)	(13		)	(15		)
Gain on the sales of rental property, net	3,239			17,563			32,276			19,225
Total other income (expense)	(9,469		)	7,106			(3,323		)	(12,337		)
Net income	$	8,876		$	21,839		$	48,989		$	23,276
Less: income attributable to noncontrolling interest after preferred stock dividends	281			828			1,589			673
Net income attributable to STAG Industrial, Inc.	$	8,595		$	21,011		$	47,400		$	22,603
Less: preferred stock dividends	1,289			2,449			6,315			7,345
Less: redemption of preferred stock	—			—			2,661			—
Less: amount allocated to participating securities	69			84			209			250
Net income attributable to common stockholders	$	7,237		$	18,478		$	38,215		$	15,008
Weighted average common shares outstanding — basic	105,783			92,787			101,095			87,632
Weighted average common shares outstanding — diluted	106,333			93,435			101,495			88,238
Net income per share — basic and diluted
Net income per share attributable to common stockholders — basic	$	0.07		$	0.20		$	0.38		$	0.17
Net income per share attributable to common stockholders — diluted	$	0.07		$	0.20		$	0.38		$	0.17

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,
	2018			2017			2018			2017
Net income	$	8,876		$	21,839		$	48,989		$	23,276
Other comprehensive income:
Income on interest rate swaps	2,060			598			12,811			300
Other comprehensive income	2,060			598			12,811			300
Comprehensive income	10,936			22,437			61,800			23,576
Income attributable to noncontrolling interest after preferred stock dividends	(281		)	(828		)	(1,589		)	(673		)
Other comprehensive income attributable to noncontrolling interest	(76		)	(26		)	(509		)	(13		)
Comprehensive income attributable to STAG Industrial, Inc.	$	10,579		$	21,583		$	59,702		$	22,890

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

5

STAG Industrial, Inc.

ConsolidatedStatements 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
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 (Note 2)	—			—	—		—			(258		)	247			(11		)	11			—
Proceeds from sales of common stock	—			10,387,962	104		276,353			—			—			276,457			—			276,457
Redemption of preferred stock	(70,000		)	—	—		5,141			(5,158		)	—			(70,017		)	—			(70,017		)
Offering costs	—			—	—		(3,129		)	—			—			(3,129		)	—			(3,129		)
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
Nine months ended September 30, 2017
Balance, December 31, 2016	$	145,000		80,352,304	$	804	$	1,293,706		$	(410,978	)	$	(1,496	)	$	1,027,036		$	39,890		$	1,066,926
Proceeds from sales of common stock	—			13,165,996	132		339,492			—			—			339,624			—			339,624
Offering costs	—			—	—		(4,746		)	—			—			(4,746		)	—			(4,746		)
Dividends and distributions, net	—			—	—		—			(100,509		)	—			(100,509		)	(4,932		)	(105,441		)
Non-cash compensation activity, net	—			43,492	—		2,911			(194		)	—			2,717			3,509			6,226
Redemption of common units to common stock	—			300,991	3		3,314			—			—			3,317			(3,317		)	—
Issuance of units	—			—	—		—			—			—			—			18,558			18,558
Rebalancing of noncontrolling interest	—			—	—		3,632			—			—			3,632			(3,632		)	—
Other comprehensive income	—			—	—		—			—			287			287			13			300
Net income	—			—	—		—			22,603			—			22,603			673			23,276
Balance, September 30, 2017	$	145,000		93,862,783	$	939	$	1,638,309		$	(489,078	)	$	(1,209	)	$	1,293,961		$	50,762		$	1,344,723

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,
	2018			2017
Cash flows from operating activities:
Net income	$	48,989		$	23,276
Adjustment to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	125,221			110,286
Loss on impairments	2,934			—
Loss on involuntary conversion	—			330
Non-cash portion of interest expense	1,698			1,465
Intangible amortization in rental income, net	3,206			3,873
Straight-line rent adjustments, net	(8,297		)	(4,855		)
Dividends on forfeited equity compensation	15			2
Loss on extinguishment of debt	13			15
Gain on the sales of rental property, net	(32,276		)	(19,225		)
Non-cash compensation expense	6,671			7,159
Change in assets and liabilities:
Tenant accounts receivable, net	501			(955		)
Prepaid expenses and other assets	(9,597		)	(10,479		)
Accounts payable, accrued expenses and other liabilities	9,249			5,572
Tenant prepaid rent and security deposits	283			3,570
Total adjustments	99,621			96,758
Net cash provided by operating activities	148,610			120,034
Cash flows from investing activities:
Acquisitions of land and buildings and improvements	(382,981		)	(405,790		)
Additions of land and building and improvements	(23,578		)	(27,539		)
Acquisitions of other assets	(794		)	—
Acquisitions of other liabilities	242			—
Proceeds from sales of rental property, net	89,407			43,454
Proceeds from insurance on involuntary conversion	—			857
Acquisition deposits, net	(695		)	685
Acquisitions of deferred leasing intangibles	(74,851		)	(79,961		)
Net cash used in investing activities	(393,250		)	(468,294		)
Cash flows from financing activities:
Proceeds from unsecured credit facility	643,000			538,000
Repayment of unsecured credit facility	(819,000		)	(321,000		)
Proceeds from unsecured term loans	150,000			—
Proceeds from unsecured notes	175,000			—
Repayment of mortgage notes	(1,379		)	(105,027		)
Payment of loan fees and costs	(4,451		)	(1,185		)
Proceeds from sales of common stock	276,457			339,624
Redemption of preferred stock	(70,000		)	—
Offering costs	(3,191		)	(4,746		)
Dividends and distributions	(117,146		)	(103,655		)
Repurchase and retirement of share-based compensation	(1,524		)	(969		)
Net cash provided by financing activities	227,766			341,042
Decrease in cash and cash equivalents and restricted cash	(16,874		)	(7,218		)
Cash and cash equivalents and restricted cash—beginning of period	28,129			21,805
Cash and cash equivalents and restricted cash—end of period	$	11,255		$	14,587
Supplemental disclosure:
Cash paid for interest, net of capitalized interest	$	31,875		$	30,476
Supplemental schedule of non-cash investing and financing activities
Issuance of units for acquisitions of land and building and improvements and deferred leasing intangibles	$	—		$	18,558
Acquisitions of land and buildings and improvements	$	(232	)	$	(17,304	)
Acquisitions of deferred leasing intangibles	$	(48	)	$	(2,064	)
Partial disposal of building due to involuntary conversion of building	$	—		$	363
Investing other receivables due to involuntary conversion of building	$	—		$	(363	)
Change in additions of land, building, and improvements included in accounts payable, accrued expenses, and other liabilities	$	(1,475	)	$	(13,201	)
Additions to building and other capital improvements from non-cash compensation	$	(20	)	$	(24	)
Change in loan fees, costs, and offering costs included in accounts payable, accrued expenses, and other liabilities	$	48		$	30
Reclassification of preferred stock called for redemption to liability	$	70,000		$	—
Dividends and distributions accrued	$	14,530		$	11,516

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

7

STAG Industrial, Inc.

Notes to Consolidated Financial Statements

(unaudited)

1. OrganizationandDescription 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, 2018 and December 31, 2017, the Company owned a 96.4% and 95.9%, 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, 2018, the Company owned 381 buildings in 37 states with approximately 75.4 million rentable square feet, consisting of 313 warehouse/distribution buildings, 59 light manufacturing buildings, and 9 flex/office buildings. The Company’s buildings were approximately 95.4% leased to 330 tenants as of September 30, 2018.

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, 2017.

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 (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.

Reclassifications and New Accounting Standards

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

New Accounting Standards Adopted

In August 2017, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) 2017-12, Derivatives and Hedging (Topic 815):Targeted Improvements to Accounting for Hedging Activities. The purpose of this updated guidance is to better align a company’s financial reporting for hedging activities with the economic objectives of those activities. This standard is effective for fiscal years beginning after December 15, 2018 and interim periods within those years, with early adoption permitted, and the Company adopted this standard effective January 1, 2018 using the modified retrospective transition method. The adoption of this standard resulted in a cumulative effect adjustment of approximately $0.3 million recorded as an increase to cumulative dividends in excess of earnings and an increase to accumulated other comprehensive income as of January 1, 2018 in the accompanying Consolidated Statements of Equity.

8

In May 2017, the FASB issued ASU 2017-09, Stock Compensation (Topic 718): Scope of Modification Accounting, which provides updated guidance about which changes to the terms or conditions of a share-based payment award would require an entity to apply modification accounting under the topic. This standard is effective for fiscal years beginning after December 15, 2017 and interim periods within those years, and the Company adopted this standard prospectively effective January 1, 2018. The adoption of this standard did not have a material effect on the Company's consolidated financial statements.

In February 2017, the FASB issued ASU 2017-05, Other Income - Gains and Losses from the Derecognition of Nonfinancial Assets (Subtopic 610-20): Clarifying the Scope of Asset Derecognition Guidance and Accounting for Partial Sales of Nonfinancial Assets, which provides guidance for recognizing gains and losses from the transfer of nonfinancial assets in contracts with non-customers. The new standard was issued as part of the new revenue standard (ASU 2014-09, as discussed below), and defines “in substance nonfinancial asset,” unifies guidance related to partial sales of nonfinancial assets, eliminates rules specifically addressing sales of real estate, removes exceptions to the financial asset derecognition model, and clarifies the accounting for contributions of nonfinancial assets to joint ventures. As a result of the new guidance, the guidance specific to real estate sales in Subtopic 360-20 was eliminated, and sales and partial sales of real estate assets will now be subject to the same derecognition model as all other nonfinancial assets. This standard is effective at the same time an entity adopts ASU 2014-09, which the Company adopted effective January 1, 2018. The Company adopted this standard effective January 1, 2018 using the modified retrospective approach. The adoption of this standard did not have a material effect on the Company's consolidated financial statements.

In January 2017, the FASB issued ASU 2017-01, Business Combinations (Topic 805): Clarifying the Definition of a Business. The new standard provides a screen to determine when a set of assets and activities is not a business. The screen requires that when substantially all of the fair value of the gross assets acquired or disposed of is concentrated in a single identifiable asset or a group of similar identifiable assets, the set is not a business. This standard is effective for annual periods beginning after December 15, 2017 and interim periods within those periods, and the Company adopted this standard prospectively effective January 1, 2018. As a result, it is expected that the majority of the Company's acquisitions will be accounted for as asset acquisitions, whereas under the former guidance the majority of the Company's acquisitions had been accounted for as business combinations. The most significant difference between the two accounting models that impacts the Company's consolidated financial statements is that in an asset acquisition, property acquisition costs are generally a component of the consideration transferred to acquire a group of assets and are capitalized as a component of the cost of the assets, whereas in a business combination, property acquisition costs are expensed and not included as part of the consideration transferred.

In November 2016, the FASB issued ASU 2016-18, Statement of Cash Flows (Topic 230): Restricted Cash.The new standard requires that the statement of cash flows explain the changes during the period in the total of cash, cash equivalents, and amounts generally described as restricted cash or restricted cash equivalents. This standard is effective for fiscal years beginning after December 15, 2017 and the Company adopted this standard effective January 1, 2018. As a result, the Company has included restricted cash with cash and cash equivalents when reconciling the beginning and end of period total amounts on the accompanying Consolidated Statements of Cash Flows. The effects of this standard were applied retrospectively to all prior periods presented. For the nine months ended September 30, 2017, the effect of the change in accounting principle was a decrease in cash provided by operating activities of approximately $0.5 million and an increase in cash used in investing activities of approximately $5.6 million on the accompanying Consolidated Statements of Cash Flows.

In January 2016, the FASB issued ASU 2016-01, Recognition and Measurement of Financial Assets and Financial Liabilities (Subtopic 825-10). The amendments in ASU 2016-01 address certain aspects of recognition, measurement, presentation, and disclosure of financial instruments. The standard primarily affects the accounting for equity investments, financial liabilities under the fair value option, and the presentation and disclosure requirements for financial instruments. ASU 2016-01 is effective for the annual periods beginning after December 31, 2017 and for annual periods and interim periods within those years, and the Company adopted this standard prospectively effective January 1, 2018. The adoption of this standard did not have a material effect on the Company's consolidated financial statements.

In May 2014, the FASB issued ASU 2014-09, Revenue from Contracts with Customers(Topic 606). ASU 2014-09 is a comprehensive new revenue recognition model requiring a company to recognize revenue to depict the transfer of goods or services to a customer at an amount reflecting the consideration it expects to receive in exchange for those goods or services. Additionally, the new revenue guidance requires improved disclosures regarding the nature, amount, timing and uncertainty of revenue and cash flows arising from contracts with customers. The Company adopted this standard effective January 1, 2018 using the modified retrospective approach. The adoption of this standard did not have a material effect on the Company's consolidated financial statements.

9

New Accounting Standards Issued but not yet Adopted

In February 2016, the FASB issued ASU 2016-02, Leases (Topic 842), and various subsequent ASU’s, which sets 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 supersedes 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 will determine 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 will be accounted for similar to existing guidance for operating leases today. The new standard requires lessors to account for leases using an approach that is substantially equivalent to existing guidance for sales-type leases, direct financing leases and operating leases. ASU 2016-02 is expected to impact the Company’s consolidated financial statements as the Company has certain operating and land lease arrangements for which it is the lessee, which will result in the recording of a right of use asset and the related lease liability. The standard is effective for fiscal years beginning after December 15, 2018, including interim periods within those fiscal years, with early adoption permitted. The new standard must be adopted using the modified retrospective transition method by recognizing a cumulative effect adjustment to the opening balance of cumulative dividends in excess of earnings, by either applying the new guidance at the beginning of the earliest comparative period or by applying the new guidance at the adoption date. The Company intends to adopt available practical expedients which allows the Company to 1) not reassess whether any expired or existing contracts are or contain leases; 2) not reassess the lease classification for any expired or existing leases; and 3) not reassess initial direct costs for any existing leases. The Company is currently in the process of evaluating the impact the adoption of ASU 2016-02 will have on the Company’s financial position or results of operations, and plans to adopt this standard effective January 1, 2019.

In May 2014, the FASB issued ASU 2014-09, Revenue from Contracts with Customers(Topic 606), which the Company adopted on January 1, 2018, as discussedin “New Accounting Standards Adopted” above. While lease contracts with customers, which constitute a vast majority of the Company’s revenues, are specifically excluded from the model’s scope, once the new leases standard under ASU 2016-02 is adopted by the Company, the new revenue standard may apply to executory costs and other components of revenue due under leases that are deemed to be non-lease components (such as common area maintenance and provision of utilities), even when the revenue for such activities is not separately stipulated in the lease. In that case, revenue from these items previously recognized on a straight-line basis under current lease guidance would be recognized under the new revenue guidance as the related services are delivered. As a result, while the total revenue recognized over time would not differ under the new guidance, the recognition pattern may be different. In July 2018, the FASB issued 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. Otherwise, the company should account for the combined component as an operating lease in accordance with Topic 842. The Company is currently in the process of evaluating the impact the adoption of ASU 2016-02 will have on the Company’s financial position or results of operations, and plans to adopt this standard effective January 1, 2019.

Restricted Cash

Restricted cash may include tenant security deposits and cash held in escrow for real estate taxes and capital improvements as required in various mortgage note agreements. Restricted cash also may include amounts held by the Company’s transfer agent for preferred stock dividends that are distributed subsequent to period end. 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, 2018		December 31, 2017
Cash and cash equivalents	$	6,024	$	24,562
Restricted cash	5,231		3,567
Total cash and cash equivalents and restricted cash	$	11,255	$	28,129

Tenant Accounts Receivable, net

As of September 30, 2018 and December 31, 2017, the Company had an allowance for doubtful accounts of approximately $0.6 million and $0.1 million, respectively.

10

As of September 30, 2018 and December 31, 2017, the Company had accrued rental income, net of allowance of approximately $30.7 million and $24.7 million, respectively. As of September 30, 2018 and December 31, 2017, the Company had an allowance on accrued rental income of $0.2 million and $0.2 million, respectively.

As of September 30, 2018 and December 31, 2017, the Company had approximately $14.6 million and $12.7 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, 2018 and December 31, 2017, 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, 2018 and December 31, 2017, the Company's total liability associated with these lease security deposits was approximately $8.7 million and $8.1 million, respectively, and is included in tenant prepaid rent and security deposits on the accompanying Consolidated Balance Sheets.

Revenue Recognition

Tenant Recoveries

The Company estimates that 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, were approximately $3.8 million, $10.9 million, $2.9 million and $9.2 million for the three and nine months ended September 30, 2018 and 2017, 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.

Gain on the Sales of Rental Property, net

The timing of the derecognition of a rental property and the corresponding recognition of gain on the sales of rental property, net is measured by various criteria related to the terms of the sale transaction, and if the Company has lost control of the property and the acquirer has gained control of the property after the transaction. If the derecognition criteria is met, the full gain is recognized.

Taxes

Federal Income Taxes

The Company's taxable REIT subsidiaries recognized a net loss of approximately $22,000, $0.1 million, $0.2 million and $0.4 million for the three and nine months ended September 30, 2018 and 2017, 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 $0.1 million, $0.6 million, $0.3 million and $0.7 million have been recorded in other expenses on the accompanying Consolidated Statements of Operations for the three and nine months ended September 30, 2018 and 2017, respectively.

Uncertain Tax Positions

As of September 30, 2018 and December 31, 2017, there were no liabilities for uncertain tax positions.

Concentrations of Credit Risk

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

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3. Rental Property

The following table summarizes the components of rental property as of September 30, 2018 and December 31, 2017.

Rental Property (in thousands)	September 30, 2018		December 31, 2017
Land	$	355,590	$	321,560
Buildings, net of accumulated depreciation of $190,538 and $160,281, respectively	2,006,013		1,756,579
Tenant improvements, net of accumulated depreciation of $35,495 and $32,714, respectively	30,577		30,138
Building and land improvements, net of accumulated depreciation of $75,754 and $56,062, respectively	160,496		143,170
Construction in progress	5,669		2,877
Deferred leasing intangibles, net of accumulated amortization of $237,892 and $280,642, respectively	327,734		313,253
Total rental property, net	$	2,886,079	$	2,567,577

Acquisitions

The following table summarizes the acquisitions of the Company during the three and nine months ended September 30, 2018.

Market (1)	Date Acquired	Square Feet	Buildings	Purchase Price (in thousands)
Greenville/Spartanburg, SC	January 11, 2018	203,000	1	$	10,755
Minneapolis/St Paul, MN	January 26, 2018	145,351	1	13,538
Philadelphia, PA	February 1, 2018	278,582	1	18,277
Houston, TX	February 22, 2018	242,225	2	22,478
Greenville/Spartanburg, SC	March 30, 2018	222,710	1	13,773
Three months ended March 31, 2018		1,091,868	6	78,821
Chicago, IL	April 23, 2018	169,311	2	10,975
Milwaukee/Madison, WI	April 26, 2018	53,680	1	4,316
Pittsburgh, PA	April 30, 2018	175,000	1	15,380
Detroit, MI	May 9, 2018	274,500	1	19,328
Minneapolis/St Paul, MN	May 15, 2018	509,910	2	26,983
Cincinnati/Dayton, OH	May 23, 2018	158,500	1	7,317
Baton Rouge, LA	May 31, 2018	279,236	1	21,379
Las Vegas, NV	June 12, 2018	122,472	1	17,920
Greenville/Spartanburg, SC	June 15, 2018	131,805	1	5,621
Denver, CO	June 18, 2018	64,750	1	7,044
Cincinnati/Dayton, OH	June 25, 2018	465,136	1	16,421
Charlotte, NC	June 29, 2018	69,200	1	5,446
Houston, TX	June 29, 2018	252,662	1	27,170
Three months ended June 30, 2018		2,726,162	15	185,300
Knoxville, TN	July 10, 2018	106,000	1	6,477
Pittsburgh, PA	August 2, 2018	265,568	1	19,186
Raleigh/Durham, NC	August 2, 2018	365,000	1	21,067
Detroit, MI	August 6, 2018	439,150	1	21,077
Des Moines, IA	August 8, 2018	121,922	1	6,053
McAllen/Edinburg/Pharr, TX	August 9, 2018	270,084	1	18,523
Pittsburgh, PA	August 15, 2018	200,500	1	11,327
Minneapolis/St Paul, MN	August 24, 2018	120,606	1	8,422
Milwaukee/Madison, WI	September 28, 2018	100,800	1	7,484
Milwaukee/Madison, WI	September 28, 2018	174,633	2	13,288
Chicago, IL	September 28, 2018	105,637	1	6,368
Indianapolis, IN	September 28, 2018	478,721	1	29,085
Augusta/Richmond County, GA	September 28, 2018	203,726	1	9,379
Charlotte, NC	September 28, 2018	301,000	1	16,807
Three months ended September 30, 2018		3,253,347	15	194,543
Nine months ended September 30, 2018		7,071,377	36	$	458,664

(1) As defined by CoStar Realty Information Inc.

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The following table summarizes the allocation of the consideration paid at the date of acquisition during the nine months ended September 30, 2018 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	$	39,340		N/A
Buildings	317,293			N/A
Tenant improvements	4,849			N/A
Building and land improvements	21,731			N/A
Deferred leasing intangibles - In-place leases	52,276			8.7
Deferred leasing intangibles - Tenant relationships	21,861			11.8
Deferred leasing intangibles - Above market leases	4,062			8.2
Deferred leasing intangibles - Below market leases	(3,122		)	6.7
Deferred leasing intangibles - Above market ground leases	(178		)	48.1
Other assets	794			N/A
Other liabilities	(242		)	N/A
Total purchase price	$	458,664

The table below sets forth the results of operations for the three and nine months ended September 30, 2018 for the buildings acquired during the nine months ended September 30, 2018 included in the Company’s Consolidated Statements of Operations from the date of acquisition.

Results of Operations (in thousands)	Three months ended September 30, 2018		Nine months ended September 30, 2018
Total revenue	$	7,122	$	11,156
Net income	$	1,556	$	1,642

Dispositions

During the nine months ended September 30, 2018, the Company sold 11 buildings comprised of approximately 2.0 million square feet with a net book value of approximately $57.1 million to third parties. These buildings contributed approximately $0.1 million, $2.7 million, $2.6 million and $7.7 million to revenue for the three and nine months ended September 30, 2018 and 2017, respectively. These buildings contributed approximately $5,000, $0.1 million, $0.5 million and $1.4 million to net income (exclusive of loss on involuntary conversion, loss on impairments, and gain on the sales of rental property, net) for the three and nine months ended September 30, 2018 and 2017, respectively. Net proceeds from the sales of rental property were approximately $89.4 million and the Company recognized the full gain on the sales of rental property, net of approximately $32.3 million for the nine months ended September 30, 2018.

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, 2018.

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)
Buena Vista, VA(4)	1	Change in estimated hold period	(5)	Discounted cash flows	(6)
Sergeant Bluff, IA(4)	1	Change in estimated hold period	(5)	Discounted cash flows	(6)
Three months ended March 31, 2018						$	3,176	$	2,934
Nine months ended September 30, 2018						$	3,176	$	2,934

(1) As defined by CoStar Realty Information Inc.

(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 assets held and used 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) These buildings do not have markets as defined by CoStar Realty Information Inc.

(5) This property was sold during the nine months ended September 30, 2018.

(6) Level 3 inputs used to determine fair value for the impaired assets held and used for the three months ended March 31, 2018: discount rates ranged from 11.0% to 14.5% and exit capitalization rates ranged from 11.0% to 13.0%.

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Deferred Leasing Intangibles

The following table sets forth the deferred leasing intangibles on the accompanying Consolidated Balance Sheets as of September 30, 2018 and December 31, 2017.

	September 30, 2018							December 31, 2017
Deferred Leasing Intangibles (in thousands)	Gross		Accumulated Amortization			Net		Gross		Accumulated Amortization			Net
Above market leases	$	70,454	$	(31,663	)	$	38,791	$	78,558	$	(36,810	)	$	41,748
Other intangible lease assets	495,172		(206,229		)	288,943		515,337		(243,832		)	271,505
Total deferred leasing intangible assets	$	565,626	$	(237,892	)	$	327,734	$	593,895	$	(280,642	)	$	313,253
Below market leases	$	33,751	$	(13,043	)	$	20,708	$	34,776	$	(13,555	)	$	21,221
Total deferred leasing intangible liabilities	$	33,751	$	(13,043	)	$	20,708	$	34,776	$	(13,555	)	$	21,221

The following table sets forth 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, 2018 and 2017.

	Three months ended September 30,				Nine months ended September 30,
Deferred Leasing Intangibles Amortization (in thousands)	2018		2017		2018		2017
Net decrease to rental income related to above and below market lease amortization	$	1,150	$	1,318	$	3,206	$	3,873
Amortization expense related to other intangible lease assets	$	20,361	$	17,934	$	56,698	$	53,747

The following table sets forth the amortization of deferred leasing intangibles over the next five calendar years beginning with 2018 as of September 30, 2018.

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 2018	$	17,263	$	927
2019	$	57,841	$	3,926
2020	$	47,750	$	3,546
2021	$	37,229	$	2,163
2022	$	29,690	$	1,154

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4. Debt

The following table sets forth a summary of 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, 2018 and December 31, 2017.

Loan	Principal Outstanding as of September 30, 2018 (in thousands)			Principal Outstanding as of December 31, 2017 (in thousands)			Interest  Rate (1)		Maturity Date	Prepayment Terms (2)
Unsecured credit facility:
Unsecured Credit Facility (3)	$	95,000		$	271,000		L + 1.05%		Jan-15-2023	i
Total unsecured credit facility	95,000			271,000
Unsecured term loans:
Unsecured Term Loan C	150,000			150,000			L + 1.30%		Sep-29-2020	i
Unsecured Term Loan B	150,000			150,000			L + 1.30%		Mar-21-2021	i
Unsecured Term Loan A	150,000			150,000			L + 1.30%		Mar-31-2022	i
Unsecured Term Loan D	150,000			—			L + 1.30%		Jan-04-2023	i
Unsecured Term Loan E (4)	—			—			L + 1.20%		Jan-15-2024	i
Total unsecured term loans	600,000			450,000
Less: Total unamortized deferred financing fees and debt issuance costs	(3,915		)	(3,735		)
Total carrying value unsecured term loans, net	596,085			446,265
Unsecured notes:
Series F Unsecured Notes	100,000			100,000			3.98	%	Jan-05-2023	ii
Series A Unsecured Notes	50,000			50,000			4.98	%	Oct-1-2024	ii
Series D Unsecured Notes	100,000			100,000			4.32	%	Feb-20-2025	ii
Series G Unsecured Notes	75,000			—			4.10	%	Jun-13-2025	ii
Series B Unsecured Notes	50,000			50,000			4.98	%	Jul-1-2026	ii
Series C Unsecured Notes	80,000			80,000			4.42	%	Dec-30-2026	ii
Series E Unsecured Notes	20,000			20,000			4.42	%	Feb-20-2027	ii
Series H Unsecured Notes	100,000			—			4.27	%	Jun-13-2028	ii
Total unsecured notes	575,000			400,000
Less: Total unamortized deferred financing fees and debt issuance costs	(2,611		)	(1,766		)
Total carrying value unsecured notes, net	572,389			398,234
Mortgage notes (secured debt):
Wells Fargo Bank, National Association CMBS Loan	53,652			54,949			4.31	%	Dec-1-2022	iii
Thrivent Financial for Lutherans	3,824			3,906			4.78	%	Dec-15-2023	iv
Total mortgage notes	57,476			58,855
Add: Total unamortized fair market value premiums	52			61
Less: Total unamortized deferred financing fees and debt issuance costs	(535		)	(634		)
Total carrying value mortgage notes, net	56,993			58,282
Total / weighted average interest rate (5)	$	1,320,467		$	1,173,781		3.69	%

(1) Interest rate as of September 30, 2018. At September 30, 2018, the one-month LIBOR (“L”) was 2.26056%. The 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 consolidated leverage ratio, as defined in the respective loan agreements.

(2) 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 beginning January 1, 2016; and (iv) pre-payable without penalty three months prior to the maturity date.

(3) 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 $3.4 million and $1.5 million is included in prepaid expenses and other assets on the accompanying Consolidated Balance Sheets as of September 30, 2018 and December 31, 2017, respectively.

(4) Capacity of $175.0 million, which the Company has until July 25, 2019 to draw.

(5) The weighted average interest rate was calculated using the fixed interest rate swapped on the notional amount of $600.0 million of debt that was in effect as of September 30, 2018, 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, 2018 was approximately $574.4 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 $7.7 million and $5.6 million as of September 30, 2018 and December 31, 2017, respectively, and is included in accounts payable, accrued expenses and other liabilities on the accompanying Consolidated Balance Sheets.

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The table below sets forth 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, 2018 and 2017.

	Three months ended September 30,				Nine months ended September 30,
Costs Included in Interest Expense (in thousands)	2018		2017		2018		2017
Amortization of deferred financing fees and debt issuance costs and fair market value premiums	$	617	$	546	$	1,698	$	1,553
Facility fees and unused fees	$	275	$	286	$	928	$	839

On July 26, 2018, the Company closed on the refinancing of its unsecured credit facility. The refinancing transaction included extending the maturity date to January 15, 2023, increasing the capacity to $500.0 million, and reducing the annual interest rate. As of September 30, 2018, the interest rate on the unsecured credit facility was LIBOR plus a spread of 1.05% based on the Company’s consolidated leverage ratio, as defined in the credit agreement. The Company recognized a loss of approximately $13,000 as a result of the acceleration of unamortized deferred financing fees, which is included in loss on extinguishment of debt in the accompanying Consolidated Statements of Operations. The remaining unamortized deferred financing fees were carried over and will be amortized with any new deferred financing fees through the new maturity date of the unsecured credit facility. As of September 30, 2018, the unsecured credit facility has an annual facility fee of 0.15% based on the Company’s consolidated leverage ratio, as defined in the credit agreement, of total commitments that is due and payable quarterly. The Company also is required to pay an annual fee of $50,000.

On July 26, 2018, the Company entered into a $175.0 million unsecured term loan agreement ("Unsecured Term Loan E"). As of September 30, 2018, the interest rate on the Unsecured Term Loan E was LIBOR plus a spread of 1.20% based on the Company's consolidated leverage ratio, as defined in the loan agreement. Unless otherwise terminated pursuant to the loan agreement, the Unsecured Term Loan E will mature on January 15, 2024. The Unsecured Term Loan E has an accordion feature that allows the Company to increase its borrowing capacity to $350.0 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 25, 2019. To the extent that the Company does not request advances of the $175.0 million of aggregate commitments by July 25, 2019, the unadvanced commitments terminate. The Unsecured Term Loan E has an unused commitment fee equal to 0.15% of its unused commitments, which began to accrue on October 24, 2018 and is due and payable monthly until the earlier of (i) the date that commitments of $175.0 million have been fully advanced, (ii) July 26, 2019, and (iii) the date that commitments of $175.0 million have been reduced to zero pursuant to the terms of the agreement. The Company also is required to pay an annual fee of $35,000. The Company and certain wholly owned subsidiaries of the Operating Partnership are guarantors of the Unsecured Term Loan E. The agreement also contains financial and other covenants substantially similar to the covenants in the Company's unsecured credit facility.

On July 26, 2018, the Company entered into amendments to its unsecured term loan agreements to conform certain provisions to the Unsecured Term Loan E agreement and the new unsecured credit facility agreement.

On April 10, 2018, the Company entered into a note purchase agreement (“NPA”) for the private placement by the Operating Partnership of $75.0 million senior unsecured notes (“Series G Unsecured Notes”) maturing June 13, 2025 with a fixed annual interest rate of 4.10%, and $100.0 million senior unsecured notes (“Series H Unsecured Notes”) maturing June 13, 2028 with a fixed annual interest rate of 4.27%. The NPA contains a number of financial covenants substantially similar to the financial covenants contained in the Company’s unsecured credit facility and other unsecured notes. The Operating Partnership issued the Series G Unsecured Notes and the Series H Unsecured Notes on June 13, 2018. In addition, on April 10, 2018, the Company entered into amendments to the note purchase agreements related to the Company’s outstanding unsecured notes to conform certain provisions in the agreements to the provisions in the NPA.

On March 28, 2018, the Company drew $75.0 million of the $150.0 million unsecured term loan that was entered into on July 28, 2017. On July 27, 2018, the Company drew the remaining $75.0 million of the $150.0 million unsecured term loan.

Financial Covenant Considerations

The Company was in compliance with all financial and other covenants as of September 30, 2018 and December 31, 2017 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 $88.4 million and $90.9 million at September 30, 2018 and December 31, 2017, respectively, and is limited to senior, property-level secured debt financing arrangements.

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Fair Value of Debt

The following table presents the aggregate principal outstanding under the Company’s debt arrangements and the corresponding estimate of fair value as of September 30, 2018 and December 31, 2017 (in thousands).

	September 30, 2018					December 31, 2017
	Principal Outstanding			Fair Value		Principal Outstanding			Fair Value
Unsecured credit facility	$	95,000		$	95,000	$	271,000		$	271,528
Unsecured term loans	600,000			607,663		450,000			451,463
Unsecured notes	575,000			569,493		400,000			415,599
Mortgage notes	57,476			57,608		58,855			59,769
Total principal amount	1,327,476			$	1,329,764	1,179,855			$	1,198,359
Add: Total unamortized fair market value premiums	52					61
Less: Total unamortized deferred financing fees and debt issuance costs	(7,061		)			(6,135		)
Total carrying value	$	1,320,467				$	1,173,781

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. Use of 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.

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The following table details the Company’s outstanding interest rate swaps as of September 30, 2018. 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	$	471	1.3300	%	One-month L	Feb-14-2020
Capital One, N.A.	Jun-13-2013	Jul-01-2013	$	50,000	$	703	1.6810	%	One-month L	Feb-14-2020
Capital One, N.A.	Jun-13-2013	Aug-01-2013	$	25,000	$	344	1.7030	%	One-month L	Feb-14-2020
Regions Bank	Sep-30-2013	Feb-03-2014	$	25,000	$	245	1.9925	%	One-month L	Feb-14-2020
The Toronto-Dominion Bank	Oct-14-2015	Sep-29-2016	$	25,000	$	700	1.3830	%	One-month L	Sep-29-2020
PNC Bank, N.A.	Oct-14-2015	Sep-29-2016	$	50,000	$	1,391	1.3906	%	One-month L	Sep-29-2020
Regions Bank	Oct-14-2015	Sep-29-2016	$	35,000	$	978	1.3858	%	One-month L	Sep-29-2020
U.S. Bank, N.A.	Oct-14-2015	Sep-29-2016	$	25,000	$	695	1.3950	%	One-month L	Sep-29-2020
Capital One, N.A.	Oct-14-2015	Sep-29-2016	$	15,000	$	417	1.3950	%	One-month L	Sep-29-2020
Royal Bank of Canada	Jan-08-2015	Mar-20-2015	$	25,000	$	684	1.7090	%	One-month L	Mar-21-2021
The Toronto-Dominion Bank	Jan-08-2015	Mar-20-2015	$	25,000	$	682	1.7105	%	One-month L	Mar-21-2021
The Toronto-Dominion Bank	Jan-08-2015	Sep-10-2017	$	100,000	$	1,488	2.2255	%	One-month L	Mar-21-2021
Wells Fargo, N.A.	Jan-08-2015	Mar-20-2015	$	25,000	$	886	1.8280	%	One-month L	Mar-31-2022
The Toronto-Dominion Bank	Jan-08-2015	Feb-14-2020	$	25,000	$	271	2.4535	%	One-month L	Mar-31-2022
Regions Bank	Jan-08-2015	Feb-14-2020	$	50,000	$	520	2.4750	%	One-month L	Mar-31-2022
Capital One, N.A.	Jan-08-2015	Feb-14-2020	$	50,000	$	467	2.5300	%	One-month L	Mar-31-2022
The Toronto-Dominion Bank	Jul-20-2017	Oct-30-2017	$	25,000	$	1,054	1.8485	%	One-month L	Jan-04-2023
Royal Bank of Canada	Jul-20-2017	Oct-30-2017	$	25,000	$	1,054	1.8505	%	One-month L	Jan-04-2023
Wells Fargo, N.A.	Jul-20-2017	Oct-30-2017	$	25,000	$	1,055	1.8505	%	One-month L	Jan-04-2023
PNC Bank, N.A.	Jul-20-2017	Oct-30-2017	$	25,000	$	1,052	1.8485	%	One-month L	Jan-04-2023
PNC Bank, N.A.	Jul-20-2017	Oct-30-2017	$	50,000	$	2,105	1.8475	%	One-month L	Jan-04-2023
The Toronto-Dominion Bank	Jul-24-2018	Jul-26-2019	$	50,000	$	111	2.9180	%	One-month L	Jan-12-2024
PNC Bank, N.A.	Jul-24-2018	Jul-26-2019	$	50,000	$	106	2.9190	%	One-month L	Jan-12-2024
Bank of Montreal	Jul-24-2018	Jul-26-2019	$	50,000	$	113	2.9190	%	One-month L	Jan-12-2024
U.S. Bank, N.A.	Jul-24-2018	Jul-26-2019	$	25,000	$	57	2.9190	%	One-month L	Jan-12-2024

The fair value of the interest rate swaps outstanding as of September 30, 2018 and December 31, 2017 was as follows.

Balance Sheet Line Item (in thousands)	Notional Amount September 30, 2018		Fair Value September 30, 2018		Notional Amount December 31, 2017		Fair Value December 31, 2017
Interest rate swaps-Asset	$	900,000	$	17,649	$	475,000	$	6,079
Interest rate swaps-Liability	$	—	$	—	$	250,000	$	(1,217	)

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 and subsequently reclassified into interest expense in the same periods during which the hedged transaction affects earnings.

Amounts reported in accumulated other comprehensive income 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 $5.1 million will be reclassified from accumulated other comprehensive income as a decrease to interest expense over the next 12 months.

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The table below presents the effect of cash flow hedge accounting and the location in the consolidated financial statements for the three and nine months ended September 30, 2018 and 2017.

	Three months ended September 30,					Nine months ended September 30,
Effect of Cash Flow Hedge Accounting (in thousands)	2018		2017			2018		2017
Income (loss) recognized in accumulated other comprehensive income on interest rate swaps	$	2,572	$	316		$	13,349	$	(1,126	)
Income (loss) reclassified from accumulated other comprehensive income into income (loss) as interest expense	$	512	$	(282	)	$	538	$	(1,426	)
Total interest expense presented in the Consolidated Statements of Operations in which the effects of cash flow hedges are recorded	$	12,698	$	10,446		$	35,602	$	31,557

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, 2018, the Company had no derivatives that were in a net liability position by counterparty.

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, 2018 and December 31, 2017, 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 sets forth the Company’s financial instruments that are accounted for at fair value on a recurring basis as of September 30, 2018 and December 31, 2017. 

			Fair Value Measurements as of September 30, 2018 Using
Balance Sheet Line Item (in thousands)	Fair Value September 30, 2018		Level 1		Level 2		Level 3
Interest rate swaps-Asset	$	17,649	$	—	$	17,649	$	—
Interest rate swaps-Liability	$	—	$	—	$	—	$	—

				Fair Value Measurements as of December 31, 2017 Using
Balance Sheet Line Item (in thousands)	Fair Value December 31, 2017			Level 1		Level 2			Level 3
Interest rate swaps-Asset	$	6,079		$	—	$	6,079		$	—
Interest rate swaps-Liability	$	(1,217	)	$	—	$	(1,217	)	$	—

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6. Equity

Preferred Stock

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”). The Company recognized a deemed dividend to the holders of the Series B Preferred Stock of approximately $2.7 million on the accompanying Consolidated Statements of Operations for the nine months ended September 30, 2018 related to redemption costs and the original issuance costs of the Series B Preferred Stock. On July 11, 2018, the Company redeemed all of the Series B Preferred Stock.

The table below sets forth the Company’s outstanding preferred stock issuances as of September 30, 2018.

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 tables below set forth the dividends attributable to the Company's outstanding preferred stock issuances during the nine months ended September 30, 2018 and the year ended December 31, 2017.

Quarter Ended 2018	Declaration Date	Series B Preferred Stock Per Share			Series C Preferred Stock Per Share		Payment Date
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		$	1.2890625

(1) On June 11, 2018, the Company gave notice to redeem all 2,800,000 issued and outstanding shares of the 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.

Quarter Ended 2017	Declaration Date	Series B Preferred Stock Per Share		Series C Preferred Stock Per Share		Payment Date
December 31	November 2, 2017	$	0.4140625	$	0.4296875	December 29, 2017
September 30	July 31, 2017	0.4140625		0.4296875		September 29, 2017
June 30	May 1, 2017	0.4140625		0.4296875		June 30, 2017
March 31	February 15, 2017	0.4140625		0.4296875		March 31, 2017
Total		$	1.6562500	$	1.7187500

On October 10, 2018, the Company’s board of directors declared the Series C Preferred Stock dividends for the quarter ending December 31, 2018 at a quarterly rate of $0.4296875 per share.

Common Stock

The following table sets forth the terms of the Company’s at-the market (“ATM”) common stock offering program as of September 30, 2018.

ATM Common Stock Offering Program	Date	Maximum Aggregate Offering Price (in thousands)		Aggregate Common Stock Available as of September 30, 2018 (in thousands)
2017 $500 million ATM	November 13, 2017	$	500,000	$	213,217

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The table below set forth the activity under the ATM common stock offering programs during the nine months ended September 30, 2018 and year ended December 31, 2017 (in thousands, except share data).

	Nine months ended September 30, 2018
ATM Common Stock Offering Program	Shares Sold	Weighted Average Price Per Share		Gross Proceeds		Sales Agents’ Fee		Net Proceeds
2017 $500 million ATM	10,387,962	$	26.61	$	276,457	$	2,888	$	273,569
Total/weighted average	10,387,962	$	26.61	$	276,457	$	2,888	$	273,569

	Year ended December 31, 2017
ATM Common Stock Offering Program	Shares Sold	Weighted Average Price Per Share		Gross Proceeds		Sales Agents’ Fee		Net Proceeds
2017 $500 million ATM	363,843	$	28.38	$	10,326	$	129	$	10,197
2017 $300 million ATM(1)	11,098,748	$	27.03	300,000		3,637		296,363
2016 $228 million ATM(1)	4,799,784	$	24.42	117,216		1,604		115,612
Total/weighted average	16,262,375	$	26.29	$	427,542	$	5,370	$	422,172

(1) These programs ended before December 31, 2017.

The table below sets forth the dividends attributable to the Company's outstanding shares of common stock that were declared during the nine months ended September 30, 2018 and the year ended December 31, 2017.

Month Ended 2018	Declaration Date	Record Date	Per Share		Payment Date
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			$	1.064997

Month Ended 2017	Declaration Date	Record Date	Per Share		Payment Date
December 31	July 31, 2017	December 29, 2017	$	0.117500	January 16, 2018
November 30	July 31, 2017	November 30, 2017	0.117500		December 15, 2017
October 31	July 31, 2017	October 31, 2017	0.117500		November 15, 2017
September 30	May 1, 2017	September 29, 2017	0.117500		October 16, 2017
August 31	May 1, 2017	August 31, 2017	0.117500		September 15, 2017
July 31	May 1, 2017	July 31, 2017	0.117500		August 15, 2017
June 30	February 15, 2017	June 30, 2017	0.116667		July 17, 2017
May 31	February 15, 2017	May 31, 2017	0.116667		June 15, 2017
April 30	February 15, 2017	April 28, 2017	0.116667		May 15, 2017
March 31	November 2, 2016	March 31, 2017	0.116667		April 17, 2017
February 28	November 2, 2016	February 28, 2017	0.116667		March 15, 2017
January 31	November 2, 2016	January 31, 2017	0.116667		February 15, 2017
Total			$	1.405002

On October 10, 2018, the Company’s board of directors declared the common stock dividends for the months ending October 31, 2018, November 30, 2018 and December 31, 2018 at a monthly rate of $0.118333 per share of common stock.

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Restricted Stock-Based Compensation

Restricted shares of common stock granted on January 5, 2018 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 2019. The following table summarizes activity related to the Company’s unvested restricted shares of common stock for the nine months ended September 30, 2018 and the year ended December 31, 2017.

Unvested Restricted Shares of Common Stock	Shares
Balance at December 31, 2016	272,337
Granted	75,001		(1)
Vested	(109,209	)	(2)
Forfeited	(922	)
Balance at December 31, 2017	237,207
Granted	76,659		(1)
Vested	(112,405	)	(2)
Forfeited	(10,630	)
Balance at September 30, 2018	190,831

(1) The fair value per share on the grant date of January 5, 2018 and January 6, 2017 was $26.40 and $24.41, respectively.

(2) The Company repurchased and retired 41,975 and 40,836 restricted shares of common stock that vested during the nine months ended September 30, 2018 and the year ended December 31, 2017, respectively.

The unrecognized compensation expense associated with the Company’s restricted shares of common stock at September 30, 2018 was approximately $3.1 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, 2018 and 2017. 

	Three months ended September 30,				Nine months ended September 30,
	2018		2017		2018		2017
Vested restricted shares of common stock	—		—		112,405		109,209
Fair value of vested restricted shares of common stock (in thousands)	$	—	$	—	$	3,002	$	2,591

7. Noncontrolling Interest

The table below summarizes the activity for noncontrolling interest in the Company for the nine months ended September 30, 2018 and the year ended December 31, 2017.

	LTIP Units		Other Common Units		Total Noncontrolling Common Units		Noncontrolling Interest
Balance at December 31, 2016	1,576,516		2,057,365		3,633,881		4.3	%
Granted/Issued	126,239		687,827		814,066		N/A
Forfeited	—		—		—		N/A
Conversions from LTIP units to Other Common Units	(245,685	)	245,685		—		N/A
Redemptions from Other Common Units to common stock	—		(351,260	)	(351,260	)	N/A
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 September 30, 2018	1,616,200		2,453,234		4,069,434		3.6	%

LTIP Units

On March 12, 2018, the Company's board of directors appointed Michelle Dilley to serve as director of the Company. On March 12, 2018, Ms. Dilley was granted 3,930 LTIP units which, subject to Ms. Dilley's continued service, will vest on January 1, 2019.

22

LTIP units granted on January 5, 2018 to non-employee, independent directors, subject to the recipient’s continued service, will vest on January 1, 2019. LTIP units granted on January 5, 2018 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, 2018. Refer to Note 8 for a discussion of vested LTIP units granted on January 5, 2018 pursuant to the 2015 Outperformance Program (the “2015 OPP”).

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 table below sets forth the assumptions used in valuing such LTIP units granted during the nine months ended September 30, 2018 (excluding those vested LTIP units granted pursuant to the 2015 OPP; refer to Note 8 for details).

LTIP Units	Assumptions
Grant date	March 12, 2018			January 5, 2018
Expected term (years)	10			10
Expected volatility	22.0		%	22.0		%
Expected dividend yield	6.0		%	6.0		%
Risk-free interest rate	2.46		%	2.09		%
Fair value of LTIP units at issuance (in thousands)	$	90		$	3,447
LTIP units at issuance	3,930			137,616
Fair value unit price per LTIP unit at issuance	$	22.90		$	25.05

The following table summarizes activity related to the Company’s unvested LTIP units for the nine months ended September 30, 2018 and the year ended December 31, 2017.

Unvested LTIP Units	LTIP Units
Balance at December 31, 2016	403,423
Granted	126,239
Vested	(229,355	)
Forfeited	—
Balance at December 31, 2017	300,307
Granted	324,802
Vested	(342,940	)
Forfeited	—
Balance at September 30, 2018	282,169

The unrecognized compensation expense associated with the Company’s LTIP units at September 30, 2018 was approximately $5.7 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 LTIP units that vested during the three and nine months ended September 30, 2018 and 2017.

	Three months ended September 30,				Nine months ended September 30,
	2018		2017		2018		2017
Vested LTIP units	30,949		44,942		342,940		157,816
Fair value of vested LTIP units (in thousands)	$	851	$	1,235	$	9,002	$	4,146

8. Equity Incentive Plan

At the Company’s annual meeting of stockholders held on April 30, 2018, the Company’s stockholders approved an amendment and restatement of the 2011 Plan, under which the Company may issue equity-based awards, including stock options, stock appreciation rights, restricted stock, restricted stock units, unrestricted stock awards and other awards based on shares of the Company’s common stock, such as LTIP units, to executive officers, directors, employees and other individuals providing bona fide services to or for the Company or its affiliates. The amendment increased the total number of shares of common stock authorized and reserved for issuance under the 2011 Plan by 3,000,000 shares to an aggregate of 6,642,461 shares, subject to certain adjustments as described in the 2011 Plan. Awards previously granted under the 2011 Plan will remain in effect pursuant to their terms.  

On January 5, 2018, 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 5, 2018 are substantially the same as the terms of the performance units granted on January 6, 2017 and March 8, 2016, except that the measuring period commences on January 1, 2018 and ends on December 31, 2020.

23

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 into earnings ratably from the grant date over the respective vesting periods. The table below sets forth the assumptions used in valuing the performance units granted during the nine months ended September 30, 2018.

Performance Units	Assumptions
Grant date	January 5, 2018
Expected volatility	22.0		%
Expected dividend yield	6.0		%
Risk-free interest rate	2.09		%
Fair value of performance units grant (in thousands)	$	5,456

On January 1, 2018, the Company’s three year measurement period pursuant to the 2015 OPP concluded. It was determined that the Company's total stockholder return exceeded the threshold percentage and return hurdle and a pool of approximately $6.2 million was awarded to the participants. The compensation committee of the board of directors approved the issuance of 183,256 vested LTIP units and 53,722 vested shares of common stock (of which 15,183 shares of common stock were repurchased and retired) to the participants, all of which were issued on January 5, 2018.

The unrecognized compensation expense associated with the Company's performance units at September 30, 2018 was approximately $6.1 million and is expected to be recognized over a weighted average period of approximately 2.3 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, the 2015 OPP (performance units and the 2015 OPP, collectively the “Performance-based Compensation Plans”), and the Company’s director compensation for the three and nine months ended September 30, 2018 and 2017.

	Three months ended September 30,				Nine months ended September 30,
Non-Cash Compensation Expense (in thousands)	2018		2017		2018		2017
Restricted shares of common stock	$	406	$	594	$	1,269	$	1,776
LTIP units	893		1,167		2,654		3,508
Performance-based Compensation Plans	838		536		2,463		1,610
Director compensation (1)	99		87		285		265
Total non-cash compensation expense	$	2,236	$	2,384	$	6,671	$	7,159

(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, 2018 and 2017. 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. Earnings Per Share

During the three and nine months ended September 30, 2018 and 2017, there were 193,117, 196,871, 237,207 and 238,129, respectively, of unvested restricted shares of common stock on a weighted average basis that were considered participating securities.

24

The following table sets forth the computation of basic and diluted earnings per common share for the three and nine months ended September 30, 2018 and 2017.

	Three months ended September 30,				Nine months ended September 30,
Earnings Per Share (in thousands, except per share data)	2018		2017		2018		2017
Numerator
Net income	$	8,876	$	21,839	$	48,989	$	23,276
Less: preferred stock dividends	1,289		2,449		6,315		7,345
Less: redemption of preferred stock	—		—		2,661		—
Less: amount allocated to participating securities	69		84		209		250
Less: income attributable to noncontrolling interest after preferred stock dividends	281		828		1,589		673
Net income attributable to common stockholders	$	7,237	$	18,478	$	38,215	$	15,008
Denominator
Weighted average common shares outstanding — basic	105,783		92,787		101,095		87,632
Effect of dilutive securities(1)
Share-based compensation	550		648		400		606
Weighted average common shares outstanding — diluted	106,333		93,435		101,495		88,238
Net income per share — basic and diluted
Net income per share attributable to common stockholders — basic	$	0.07	$	0.20	$	0.38	$	0.17
Net income per share attributable to common stockholders — diluted	$	0.07	$	0.20	$	0.38	$	0.17

(1) During the three and nine months ended September 30, 2018 and 2017, there were approximately 193, 197, 237 and 238, respectively, unvested restricted shares of common stock on a weighted average basis that were not included in the computation of diluted earnings per share because to do so would have been antidilutive for the period.

10. 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 $5.6 million as of September 30, 2018 related to construction projects and certain other agreements.

11. Subsequent Events

There were no recognized or non-recognized subsequent events.

25

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. (“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, 2017, 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;

• 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;

• 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.

Overview

We are a REIT focused on the acquisition 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.

As used herein “total annualized base rental revenue” refers to the contractual monthly base rent as of September 30, 2018 (which differs from rent calculated in accordance with generally accepted accounting principles in the United States of America (“GAAP”)) multiplied by 12. If a tenant is in a free rent period as of September 30, 2018, the annualized rent is calculated based on the first contractual monthly base rent amount multiplied by 12.

Outlook

The outlook for our business remains positive, albeit on a moderated basis in light of over eight years of economic growth, some uncertainty regarding U.S. policy initiatives, and continued asset appreciation. In September 2018, the federal funds target rate was raised 25 basis points to a target range of 2.00% to 2.25%. This announcement combined with the unwinding of its balance sheet by selling Treasury securities and anticipation of one more rate increase in 2018 are signs of the Central Bank’s confidence in the economy. The current trajectory of the federal funds target rate aligns with the Central Bank’s consistent commentary that future rate increases would be gradual. If interest rates rise further as a result of Federal Reserve policy action (short-term interest rates) or changes in market expectations and capital flows (long-term interest rates), we believe strengthening economic conditions are likely to accompany these changes. This strengthening of economic conditions combined with the currently favorable industrial supply demand environment should translate to a net positive result for our business. Specifically, our existing portfolio should benefit from rising rental rates and our acquisition activity should benefit from higher yields. Furthermore, we believe certain characteristics of our business should position us well in a rising 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 rate increases.

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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.

Furthermore, the lack of material speculative development and the broader failure of supply to keep pace with demand in many of our markets has improved and may continue to modestly improve occupancy levels and rental rates in our portfolio. We believe, however, that industrial supply, more so than other real estate property types, has historically had a short lead time and can appear quickly. We have started to see a notable pick-up in development activity in a growing number of the primary industrial 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, 2018, our Operating Portfolio was approximately 96.0% leased and our straight-line (“SL”) rent change (as defined below) on new and renewal leases together grew approximately 10.6% and 14.7% during the three and nine months ended September 30, 2018, respectively. 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 Stabilization for assets under redevelopment to occur upon the earlier of achieving 90% occupancy or 12 months after completion. Stabilization for assets that were acquired and immediately added to the Value Add Portfolio occurs under the following: (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 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; or (iii) out of service with significant physical renovation of the asset.

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.

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The following table provides a summary of our Operating Portfolio leases executed during the three and nine months ended September 30, 2018. 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(2)		SL Rent Change(3)		Weighted Average Lease Term(4) (years)	Rental Concessions per Square Foot(5)
Three months ended September 30, 2018
New Leases(6)	544,253	$	4.26	$	4.41	$	2.61	(4.1	)%	(0.4	)%	5.6	$	0.54
Renewal Leases(7)	523,306	4.37		4.52		0.56		13.9	%	19.5	%	3.6	—
Total/weighted average	1,067,559	$	4.31	$	4.46	$	1.60	5.9	%	10.6	%	4.6	$	0.27
Nine months ended September 30, 2018
New Leases(6)	1,756,935	$	3.73	$	3.87	$	2.33	9.9	%	17.7	%	6.8	$	0.75
Renewal Leases(7)	5,254,633	3.98		4.11		0.62		7.4	%	14.1	%	4.6	0.07
Total/weighted average	7,011,568	$	3.91	$	4.05	$	1.05	7.9	%	14.7	%	5.1	$	0.24

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

(2) Wedefine Cash Rent Change as the percentage change in the base rent of the lease executed 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 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. This resulted in 192,707 and 1,532,343 square feet to be deemed non-comparable for three and nine months ended September 30, 2018, respectively.

(3) We define SL Rent Change as the percentage change in the average monthly base rent over the term of the lease, calculated on a straight-line basis, of the lease executed 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.

(4) We define Weighted Average Lease Term as the contractual lease term in years as of the lease start date weighted by square footage.

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

(6) We define a New Lease as any lease that is signed for an initial term equal to or greater than twelve months for any vacant space; this includes a new tenant or an existing tenant that is expanding into new (additional) space.

(7) We define a Renewal Lease as a lease signed by an existing tenant to extend the term for twelve 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 twelve months or more.

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. 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 9.7% of our annualized base rental revenue will expire during the period from October 1, 2018 to September 30, 2019, 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 higher than the rates under existing leases expiring during the period October 1, 2018 to September 30, 2019, thereby resulting in higher revenue from the same space.

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The following table sets forth a summary of lease expirations for leases in place as of September 30, 2018, plus available space, for each of the ten calendar years beginning with 2018 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	—	3,466,010	—		—		—
Month-to-month leases	5	205,043	0.3	%	$	828	0.3	%
Remainder of 2018	4	798,875	1.1	%	3,489		1.2	%
2019	53	8,413,096	11.7	%	35,622		11.8	%
2020	50	9,814,812	13.6	%	42,116		14.0	%
2021	69	10,940,764	15.2	%	47,063		15.6	%
2022	51	6,532,253	9.1	%	28,129		9.3	%
2023	46	8,755,494	12.2	%	32,648		10.9	%
2024	28	5,320,625	7.4	%	21,716		7.2	%
2025	23	3,991,385	5.5	%	17,349		5.8	%
2026	23	5,069,584	7.0	%	19,818		6.6	%
2027	12	1,916,418	2.7	%	9,059		3.0	%
Thereafter	45	10,161,454	14.2	%	43,022		14.3	%
Total	409	75,385,813	100.0	%	$	300,859	100.0	%

Portfolio Summary

The following table sets forth information relating to diversification by building type in our portfolio as of September 30, 2018.

		Square Footage					Annualized Base Rental Revenue
Building Type	Number of Buildings	Amount	%		Occupancy Rate(1)		Amount (in thousands)		%
Warehouse/Distribution	309	67,433,301	89.5	%	95.7	%	$	264,832	88.1	%
Light Manufacturing	59	6,614,487	8.8	%	100.0	%	29,615		9.8	%
Total Operating Portfolio/weighted average	368	74,047,788	98.3	%	96.0	%	$	294,447	97.9	%
Value Add	4	773,345	1.0	%	53.7	%	1,792		0.6	%
Flex/Office	9	564,680	0.7	%	67.9	%	4,620		1.5	%
Total portfolio/weighted average	381	75,385,813	100.0	%	95.4	%	$	300,859	100.0	%

(1) 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.

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Portfolio Acquisitions

The following table summarizes our acquisitions during the nine months endedSeptember 30, 2018.

Market (1)	Date Acquired	Square Feet	Buildings	Purchase Price (in thousands)
Greenville/Spartanburg, SC	January 11, 2018	203,000	1	$	10,755
Minneapolis/St Paul, MN	January 26, 2018	145,351	1	13,538
Philadelphia, PA	February 1, 2018	278,582	1	18,277
Houston, TX	February 22, 2018	242,225	2	22,478
Greenville/Spartanburg, SC	March 30, 2018	222,710	1	13,773
Three months ended March 31, 2018		1,091,868	6	78,821
Chicago, IL	April 23, 2018	169,311	2	10,975
Milwaukee/Madison, WI	April 26, 2018	53,680	1	4,316
Pittsburgh, PA	April 30, 2018	175,000	1	15,380
Detroit, MI	May 9, 2018	274,500	1	19,328
Minneapolis/St Paul, MN	May 15, 2018	509,910	2	26,983
Cincinnati/Dayton, OH	May 23, 2018	158,500	1	7,317
Baton Rouge, LA	May 31, 2018	279,236	1	21,379
Las Vegas, NV	June 12, 2018	122,472	1	17,920
Greenville/Spartanburg, SC	June 15, 2018	131,805	1	5,621
Denver, CO	June 18, 2018	64,750	1	7,044
Cincinnati/Dayton, OH	June 25, 2018	465,136	1	16,421
Charlotte, NC	June 29, 2018	69,200	1	5,446
Houston, TX	June 29, 2018	252,662	1	27,170
Three months ended June 30, 2018		2,726,162	15	185,300
Knoxville, TN	July 10, 2018	106,000	1	6,477
Pittsburgh, PA	August 2, 2018	265,568	1	19,186
Raleigh/Durham, NC	August 2, 2018	365,000	1	21,067
Detroit, MI	August 6, 2018	439,150	1	21,077
Des Moines, IA	August 8, 2018	121,922	1	6,053
McAllen/Edinburg/Pharr, TX	August 9, 2018	270,084	1	18,523
Pittsburgh, PA	August 15, 2018	200,500	1	11,327
Minneapolis/St Paul, MN	August 24, 2018	120,606	1	8,422
Milwaukee/Madison, WI	September 28, 2018	100,800	1	7,484
Milwaukee/Madison, WI	September 28, 2018	174,633	2	13,288
Chicago, IL	September 28, 2018	105,637	1	6,368
Indianapolis, IN	September 28, 2018	478,721	1	29,085
Augusta/Richmond County, GA	September 28, 2018	203,726	1	9,379
Charlotte, NC	September 28, 2018	301,000	1	16,807
Three months ended September 30, 2018		3,253,347	15	194,543
Nine months ended September 30, 2018		7,071,377	36	$	458,664

(1) As defined by CoStar Realty Information Inc.

Portfolio Dispositions

During the nine months ended September 30, 2018, we sold 11 buildings comprised of approximately 2.0 million square feet with a net book value of approximately $57.1 million to third parties. Net proceeds from the sales of rental property were approximately $89.4 million and we recognized the full gain on the sales of rental property, net of approximately $32.3 million for the nine months ended September 30, 2018.

We may dispose of additional properties from time to time and, among other individual properties, are currently marketing for sale a portfolio of seven assets in six states. The seven assets contain a total of approximately 1.8 million rentable square feet. We make no assurance that the sale will occur or, if it does, that the portfolio sold will not differ substantially from the portfolio now on the market.

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Geographic Diversification

The following table sets forth information about the ten largest markets in our portfolio based on total annualized base rental revenue as of September 30, 2018.

Top Ten Markets (1)	% of Total Annualized Base Rental Revenue
Philadelphia, PA	9.5	%
Chicago, IL	8.6	%
Greenville/Spartanburg, SC	4.8	%
Milwaukee/Madison, WI	4.1	%
Detroit, MI	3.9	%
Cincinnati/Dayton, OH	3.3	%
Charlotte, NC	3.2	%
Houston, TX	3.2	%
Minneapolis/St Paul, MN	3.0	%
Pittsburgh, PA	2.8	%
Total	46.4	%

(1) As defined by CoStar Realty Information Inc.

Industry Diversification

The following table sets forth information about the ten largest tenant industries in our portfolio based on total annualized base rental revenue as of September 30, 2018.

Top Ten Tenant Industries (1)	% of Total Annualized Base Rental Revenue
Capital Goods	14.8	%
Automobiles & Components	12.8	%
Materials	11.7	%
Transportation	8.9	%
Consumer Durables & Apparel	8.9	%
Food, Beverage & Tobacco	7.9	%
Commercial & Prof Services	7.6	%
Retailing	5.0	%
Household & Personal Products	4.7	%
Food & Staples Retailing	4.3	%
Total	86.6	%

(1) Industry classification based on GICS methodology.

Top Tenants

The following table sets forth information about the ten largest tenants in our portfolio based on total annualized base rental revenue as of September 30, 2018.

Top Ten Tenants (1)	Number of Leases	% of Total Annualized Base Rental Revenue
General Service Administration	1	2.3	%
XPO Logistics	4	1.9	%
Deckers Outdoor	2	1.4	%
Yanfeng US Automotive Interior	3	1.3	%
Solo Cup	1	1.3	%
TriMas Corporation	4	1.2	%
DHL	4	1.0	%
Generation Brands	1	0.9	%
Schneider Electric USA, Inc.	4	0.9	%
Carolina Beverage Group	2	0.9	%
Total	26	13.1	%

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

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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, 2017, for a discussion of our critical accounting policies and estimates.

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.

Comparison of the three months ended September 30, 2018 to the three months ended September 30, 2017

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 June 30, 2017. On September 30, 2018, we owned 309 industrial buildings consisting of approximately 61.8 million square feet, which represents approximately 82.0% of our total portfolio, that are considered our same store portfolio in the analysis below. Same store occupancy decreased approximately 0.3% to 96.1% as of September 30, 2018 compared to 96.4% as of September 30, 2017.

The following table summarizes selected operating information for our same store portfolio and our total portfolio for the three months ended September 30, 2018 and 2017 (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, 2018 and 2017 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 June 30, 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
	2018		2017		$			%		2018		2017		2018		2017		2018			2017			$			%
Revenue
Operating revenue
Rental income	$	61,926	$	60,611	$	1,315		2.2	%	$	9,977	$	3,030	$	3,256	$	2,032	$	75,159		$	65,673		$	9,486		14.4	%
Tenant recoveries	10,760		11,239		(479		)	(4.3	)%	1,865		620		893		507		13,518			12,366			1,152			9.3	%
Other income	254		44		210			477.3	%	15		50		—		11		269			105			164			156.2	%
Total operating revenue	72,940		71,894		1,046			1.5	%	11,857		3,700		4,149		2,550		88,946			78,144			10,802			13.8	%
Expenses
Property	13,572		13,388		184			1.4	%	2,049		993		1,491		1,020		17,112			15,401			1,711			11.1	%
Net operating income (1)	$	59,368	$	58,506	$	862		1.5	%	$	9,808	$	2,707	$	2,658	$	1,530	71,834			62,743			9,091			14.5	%
Other expenses
General and administrative																		8,911			8,380			531			6.3	%
Property acquisition costs																		—			1,386			(1,386		)	(100.0	)%
Depreciation and amortization																		44,355			38,186			6,169			16.2	%
Other expenses																		223			58			165			284.5	%
Total other expenses																		53,489			48,010			5,479			11.4	%
Total expenses																		70,601			63,411			7,190			11.3	%
Other income (expense)
Interest and other income																		3			2			1			50.0	%
Interest expense																		(12,698		)	(10,446		)	(2,252		)	21.6	%
Loss on extinguishment of debt																		(13		)	(13		)	—			—	%
Gain on the sales of rental property, net																		3,239			17,563			(14,324		)	(81.6	)%
Total other income (expense)																		(9,469		)	7,106			(16,575		)	(233.3	)%
Net income																		$	8,876		$	21,839		$	(12,963	)	(59.4	)%

(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 $13.0 million or 59.4% to $8.9 million for the three months ended September 30, 2018, compared to $21.8 million for the three months ended September 30, 2017.

Same Store Total Operating Revenue

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

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

Same store rental income increased by $1.3 million or 2.2% to $61.9 million for the three months ended September 30, 2018 compared to $60.6 million for the three months ended September 30, 2017. Approximately $2.4 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 $1.1 million decrease due to a reduction of base rent due to tenants downsizing their spaces and vacancies.

Same store tenant recoveries decreased by $0.5 million or 4.3% to $10.8 million for the three months ended September 30, 2018 compared to $11.2 million for the three months ended September 30, 2017. The decrease was primarily attributable to one of our properties where it was determined, during the three months ended September 30, 2017, that the tenant will not be able to meet its requirements set forth by the taxing authority to be entitled to an abatement of real estate taxes. The abatement was applicable to prior periods, and therefore the expense and related recovery recorded for the three months ended September 30, 2017 includes 36 months of real estate taxes, which attributed to approximately $0.6 million of the decrease in same store tenant recoveries as it did not recur for the three months ended September 30, 2018. Additionally, approximately $0.3 million of the decrease related to the vacancy of previously occupied buildings and decreases in real estate taxes levied by the taxing authority. These decreases were partially offset by an increase of approximately $0.4 million related to increases in occupancy and real estate taxes levied by the taxing authority.

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 $0.2 million or 1.4% to $13.6 million for the three months ended September 30, 2018 compared to $13.4 million for the three months ended September 30, 2017. This increase was primarily related to increases in general repairs and maintenance and utilities expense of approximately $0.4 million and an increase in real estate taxes levied by the related taxing authority of approximately $0.1 million. Additionally during the three months ended September 30, 2017 approximately $0.3 million of previously recorded bad debt reserve was reversed, which did not recur during the three months ended September 30, 2018. These increases were partially offset by a decrease in real estate taxes attributable to one of our properties where it was determined, during the three months ended September 30, 2017, that the tenant will not be able to meet its requirements set forth by the taxing authority to be entitled to an abatement of real estate taxes. The abatement was applicable to prior periods, and therefore the expense and related recovery recorded for the three months ended September 30, 2017 includes 36 months of real estate taxes, which attributed to approximately $0.6 million of the decrease in same store operating expenses as it did not recur for the three months ended September 30, 2018.

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 June 30, 2017, we acquired 53 buildings consisting of approximately 10.5 million square feet (excluding four buildings that were included in the Value Add Portfolio at September 30, 2018 or transferred from the Value Add Portfolio to the Operating Portfolio after June 30, 2017), and sold 18 buildings consisting of approximately 3.7 million square feet. For the three months ended September 30, 2018 and 2017, the buildings acquired after June 30, 2017 contributed approximately $9.8 million and $0.2 million to NOI, respectively. For the three months ended September 30, 2018 and 2017, the buildings sold after June 30, 2017 contributed approximately $(8,000) and $2.5 million to NOI, respectively. Refer to Note 3 in the accompanying Notes to Consolidated Financial Statements for additional discussion regarding buildings acquired or sold.

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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 June 30, 2017. Other NOI also includes termination income 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, 2018, we owned nine flex/office buildings consisting of approximately 0.6 million square feet, four buildings in our Value Add Portfolio consisting of approximately 0.8 million square feet, and six buildings consisting of approximately 1.8 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 June 30, 2017. These buildings contributed approximately $2.5 million and $1.3 million to NOI for the three months ended September 30, 2018 and 2017, respectively. Additionally, there was $0.2 million and $0.2 million of termination fee income from certain buildings in our same store portfolio for the three months ended September 30, 2018 and 2017, respectively.

Total Other Expenses

Total other expenses consist of general and administrative expenses, property acquisition costs, depreciation and amortization, and other expenses.

Total other expenses increased$5.5 million or 11.4% for the three months ended September 30, 2018 to $53.5 million compared to $48.0 million for the three months ended September 30, 2017. This is primarily a result of an increase in depreciation and amortization of approximately $6.2 million as a result of acquisitions increased the depreciable asset base. General and administrative expenses increased by approximately $0.5 million due to increases in compensation and other payroll costs. Additionally, other expenses increased by approximately $0.2 million primarily due to a gain on incentive fee of approximately $0.2 million during the three months ended September 30, 2017 due to the finalization of a one-time incentive fee payable to Columbus Nova Real Estate Acquisition Group, LLC, which did not recur during the three months ended September 30, 2018. These increases were partially offset by a decrease in property acquisition costs of approximately $1.4 million due to the adoption of Accounting Standards Update 2017-01, as discussed in Note 2 of the accompanying Notes to Consolidated Financial Statements.

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 net other income decreased $16.6 million or 233.3% to a net other expense position of $9.5 million for the three months ended September 30, 2018 compared a net other income of $7.1 million for the three months ended September 30, 2017. This decrease is primarily the result of a decrease in the gain on the sales of rental property, net of approximately $14.3 million. This decrease is also attributable to an increase in interest expense of approximately $2.3 million which was primarily attributable tothe issuance of new unsecured term loans and unsecured notes as discussed in Note 4 of the accompanying Notes to Consolidated Financial Statements.

Comparison of the nine months ended September 30, 2018 to the nine months ended September 30, 2017

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, 2016. On September 30, 2018, we owned 278 industrial buildings consisting of approximately 55.1 million square feet, which represents approximately 73.1% of our total portfolio, that are considered our same store portfolio in the analysis below. Same store occupancy decreased approximately 0.4% to 95.6% as of September 30, 2018 compared to 96.0% as of September 30, 2017.

The following table summarizes selected operating information for our same store portfolio and our total portfolio for the nine months ended September 30, 2018 and 2017 (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, 2018 and 2017 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, 2016 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
	2018		2017		$		%		2018		2017		2018		2017		2018			2017			$			%
Revenue
Operating revenue
Rental income	$	162,063	$	158,798	$	3,265	2.1	%	$	44,984	$	21,629	$	10,180	$	6,194	$	217,227		$	186,621		$	30,606		16.4	%
Tenant recoveries	28,341		27,519		822		3.0	%	8,693		4,004		2,409		1,429		39,443			32,952			6,491			19.7	%
Other income	725		118		607		514.4	%	216		70		92		56		1,033			244			789			323.4	%
Total operating revenue	191,129		186,435		4,694		2.5	%	53,893		25,703		12,681		7,679		257,703			219,817			37,886			17.2	%
Expenses
Property	35,947		33,839		2,108		6.2	%	10,337		5,317		4,451		3,156		50,735			42,312			8,423			19.9	%
Net operating income (1)	$	155,182	$	152,596	$	2,586	1.7	%	$	43,556	$	20,386	$	8,230	$	4,523	206,968			177,505			29,463			16.6	%
Other expenses
General and administrative																	25,637			25,090			547			2.2	%
Property acquisition costs																	—			4,684			(4,684		)	(100.0	)%
Depreciation and amortization																	125,221			110,286			14,935			13.5	%
Loss on impairments																	2,934			—			2,934			100.0	%
Loss on involuntary conversion																	—			330			(330		)	(100.0	)%
Other expenses																	864			1,502			(638		)	(42.5	)%
Total other expenses																	154,656			141,892			12,764			9.0	%
Total expenses																	205,391			184,204			21,187			11.5	%
Other income (expense)
Interest and other income																	16			10			6			60.0	%
Interest expense																	(35,602		)	(31,557		)	(4,045		)	12.8	%
Loss on extinguishment of debt																	(13		)	(15		)	2			(13.3	)%
Gain on the sales of rental property, net																	32,276			19,225			13,051			67.9	%
Total other income (expense)																	(3,323		)	(12,337		)	9,014			73.1	%
Net income																	$	48,989		$	23,276		$	25,713		110.5	%

(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 $25.7 million or 110.5% to $49.0 million for the nine months ended September 30, 2018 compared to $23.3 million for the nine months ended September 30, 2017.

Same Store Total Operating Revenue

Same store total operating revenue consists primarily of (i) rental income consisting of base rent, straight-line rent and above and below market lease amortization from our properties, and (ii) tenant recoveries.

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

Same store rental income increased by $3.3 million or 2.1% to $162.1 million for the nine months ended September 30, 2018 compared to $158.8 million for the nine months ended September 30, 2017. Approximately $5.9 million of the increase was attributable to rental increases due to new leases and renewals of existing tenants. Same store rental income also increased by approximately $0.5 million due to a net decrease in the amortization of net above market leases. These increases were partially offset by an approximately $3.1 million decrease due to a reduction of base rent due to tenants downsizing their spaces and vacancies.

Same store tenant recoveries increased by $0.8 million or 3.0% to $28.3 million for the nine months ended September 30, 2018 compared to $27.5 million for the nine months ended September 30, 2017. Approximately $2.7 million of the increase was primarily due to increases in occupancy and real estate taxes levied by the taxing authority, as well as 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. This increase was partially offset by a decrease of approximately $1.3 million related to vacancy of previously occupied buildings and decreases in real estate taxes levied by the taxing authority. These increases were also partially offset by one of our properties where it was determined, during the nine months ended September 30, 2017, that the tenant will not be able to meet its requirements set forth by the taxing authority to be entitled to an abatement of real estate taxes. The abatement was applicable to prior periods, and therefore the expense and related recovery recorded for the nine months ended September 30, 2017 includes 36 months of real estate taxes, which attributed to approximately $0.6 million of the decrease in same store tenant recoveries as it did not recur for the nine months ended September 30, 2018.

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 $2.1 million or 6.2% to $35.9 million for the nine months ended September 30, 2018 compared to $33.8 million for the nine months ended September 30, 2017. This increase was primarily related to increases in general repairs and maintenance expense of approximately $0.4 million, an increase in real estate taxes levied by the related taxing authority of approximately $0.8 million, an increase of approximately $0.6 million in snow removal and utilities expenses, and an increase of approximately $0.6 million of bad debt expense. Additionally during the nine months ended September 30, 2017 approximately $0.3 million of previously recorded bad debt reserve was reversed, which did not recur during the nine months ended September 30, 2018. These increases were partially offset by a decrease in real estate taxes attributable to one of our properties where it was determined, during the nine months ended September 30, 2017, that the tenant will not be able to meet its requirements set forth by the taxing authority to be entitled to an abatement of real estate taxes. The abatement was applicable to prior periods, and therefore the expense and related recovery recorded for the nine months ended September 30, 2017 includes 36 months of real estate taxes, which attributed to approximately $0.6 million of the decrease in same store operating expenses as it did not recur for the three months ended September 30, 2018.

Acquisitionsand DispositionsNet Operating Income

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

Subsequent to December 31, 2016, we acquired 83 buildings consisting of approximately 17.0 million square feet (excluding six buildings that were included in the Value Add Portfolio at September 30, 2018 or transferred from the Value Add Portfolio to the Operating Portfolio after December 31, 2016), and sold 22 buildings consisting of approximately 3.9 million square feet. For the nine months ended September 30, 2018 and September 30, 2017, the buildings acquired after December 31, 2016 contributed approximately $42.2 million and $12.1 million to NOI, respectively. For the nine months ended September 30, 2018 and

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September 30, 2017, the buildings sold after December 31, 2016 contributed approximately $1.4 million and $8.3 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, 2016. Other NOI also includes termination income from buildings from our same store portfolio.

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

At September 30, 2018 we owned nine flex/office buildings consisting of approximately 0.6 million square feet, four buildings in our Value Add Portfolio consisting of approximately 0.8 million square feet, and seven buildings consisting of approximately 2.0 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, 2016. These buildings contributed approximately $7.8 million and $3.8 million to NOI for the nine months ended September 30, 2018 and September 30, 2017, respectively. Additionally, there was $0.4 million and $0.7 million of termination fee income from certain buildings in our same store portfolio for the nine months ended September 30, 2018 and September 30, 2017, respectively.

Total Other Expenses

Total other expenses consist of general and administrative expenses, property acquisition costs, depreciation and amortization, loss on impairments, loss on involuntary conversion, and other expenses.

Total other expenses increased$12.8 million or 9.0% to $154.7 million for the nine months ended September 30, 2018 compared to $141.9 million for the nine months ended September 30, 2017. This is primarily a result of an increase in depreciation and amortization of approximately $14.9 million as a result of acquisitions that increased the depreciable asset base. The increase was also attributable to two buildings that were impaired in the amount of approximately $2.9 million during the nine months ended September 30, 2018, whereas there were no buildings impaired during the nine months ended September 30, 2017. General and administrative expenses increased by approximately $0.5 million due to increases in compensation and other payroll costs. These increases were partially offset by a decrease in property acquisition costs of approximately $4.7 million due to the adoption of Accounting Standards Update 2017-01, as discussed in Note 2 of the accompanying Notes to Consolidated Financial Statements. Additionally, loss on involuntary conversion decreased approximately $0.3 million as there were no involuntary conversion events during the nine months ended September 30, 2018, and other expenses decreased by approximately $0.6 million primarily due to the finalization of a one-time incentive fee during the nine months ended September 30, 2017 payable to Columbus Nova Real Estate Acquisition Group, LLC, which did not recur for the nine months ended September 30, 2018.

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 expenses decreased$9.0 million or 73.1% to $3.3 million for the nine months ended September 30, 2018 compared to $12.3 million for the nine months ended September 30, 2017. This decrease was primarily the result of an increase in the gain on the sales of rental property of approximately $13.1 million. This was partially offset by an increase in interest expense of approximately $4.0 million which was primarily attributable to a higher unsecured credit facility balance during the nine months ended September 30, 2018 compared to the nine months ended September 30, 2017, and the issuance of new unsecured term loans and unsecured notes as discussed in Note 4 of the accompanying Notes to Consolidated Financial Statements. The increase in interest expense was slightly offset by the repayment of several mortgage notes during the year ended December 31, 2017.

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.

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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.

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, 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)	2018			2017			2018			2017
Net income	$	8,876		$	21,839		$	48,989		$	23,276
Rental property depreciation and amortization	44,281			38,114			124,999			110,069
Loss on impairments	—			—			2,934			—
Gain on the sales of rental property, net	(3,239		)	(17,563		)	(32,276		)	(19,225		)
FFO	49,918			42,390			144,646			114,120
Preferred stock dividends	(1,289		)	(2,449		)	(6,315		)	(7,345		)
Redemption of preferred stock	—			—			(2,661		)	—
FFO attributable to common stockholders and unit holders	$	48,629		$	39,941		$	135,670		$	106,775

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 revenue, including reimbursements and other income, 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.

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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)	2018			2017			2018			2017
Net income	$	8,876		$	21,839		$	48,989		$	23,276
Asset management fee income	—			(9		)	—			(52		)
General and administrative	8,911			8,380			25,637			25,090
Property acquisition costs	94			1,386			170			4,684
Depreciation and amortization	44,355			38,186			125,221			110,286
Interest and other income	(3		)	(2		)	(16		)	(10		)
Interest expense	12,698			10,446			35,602			31,557
Loss on impairments	—			—			2,934			—
Loss on involuntary conversion	—			—			—			330
Loss on extinguishment of debt	13			13			13			15
Other expenses	129			260			694			813
(Gain) loss on incentive fee	—			(202		)	—			689
Gain on the sales of rental property, net	(3,239		)	(17,563		)	(32,276		)	(19,225		)
Net operating income	$	71,834		$	62,734		$	206,968		$	177,453

Cash Flows

Comparison of the nine months ended September 30, 2018 to the nine months ended September 30, 2017

The following table summarizes our cash flows for the nine months ended September 30, 2018 compared to the nine months ended September 30, 2017.

	Nine months ended September 30,				Change
Cash Flows (dollars in thousands)	2018		2017		$			%
Net cash provided by operating activities	$	148,610	$	120,034	$	28,576		23.8	%
Net cash used in investing activities	$	393,250	$	468,294	$	(75,044	)	(16.0	)%
Net cash provided by financing activities	$	227,766	$	341,042	$	(113,276	)	(33.2	)%

Net cash provided by operating activitiesincreased$28.6 million to $148.6 million for the nine months ended September 30, 2018 compared to $120.0 million for the nine months ended September 30, 2017. The increase was primarily attributable to incremental operating cash flows from property acquisitions completed after December 31, 2016, and operating performance at existing properties. These increases were partially offset by the loss of cash flows from property dispositions completed after December 31, 2016 and fluctuations in working capital due to timing of payments and rental receipts.

Net cash used in investing activitiesdecreased$75.0 million to $393.3 million for the nine months ended September 30, 2018 compared to $468.3 million for the nine months ended September 30, 2017. The decreased cash outflow was primarily due to the acquisition of 36 buildings for a total cash consideration of approximately $458.4 million for the nine months ended September 30, 2018 compared to the acquisition of 42 buildings for a total cash consideration of approximately $485.8 million for the nine months ended September 30, 2017. The decrease is also attributable to the sale of 11 buildings during the nine months ended September 30, 2018 for net proceeds of approximately $89.4 million, compared to the nine months ended September 30, 2017 where we sold nine buildings for net proceeds of approximately $43.5 million.

Net cash provided by financing activitiesdecreased$113.3 million to $227.8 million for the nine months ended September 30, 2018 compared to $341.0 million for the nine months ended September 30, 2017. The decrease was primarily due to an increase in net cash outflow on our unsecured credit facility of approximately $393.0 million and a decrease in proceeds from sales of common stock of approximately $63.2 million, as well as an approximately $13.5 million increase in dividends paid during the nine months ended September 30, 2018 compared to the nine months ended September 30, 2017 and the redemption of the 6.625% Series B Cumulative Redeemable Preferred Stock (“Series B Preferred Stock”) of $70.0 million on July 11, 2018. These increases in net cash outflow were partially offset by the $150.0 million draw on the unsecured term loan that was entered into on July 28, 2017, the funding of the unsecured notes that were entered into on April 10, 2018 of $175.0 million, as well as a decrease in the repayment of mortgage notes of approximately $103.6 million during the nine months ended September 30, 2018 compared to the nine months ended September 30, 2017.

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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 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, 2018, we had total immediate liquidity of approximately $580.4 million, comprised of $6.0 million of cash and cash equivalents and $574.4 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 common unit holders in our Operating Partnership. The table below sets forth the dividends attributable to our outstanding common stock that had a record date during the nine months ended September 30, 2018. 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.

Month Ended 2018	Declaration Date	Record Date	Per Share		Payment Date
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			$	1.064997

On October 10, 2018, our board of directors declared the common stock dividends for the months ending October 31, 2018, November 30, 2018 and December 31, 2018 at a monthly rate of $0.118333 per share of common stock.

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During the nine months ended September 30, 2018, we paid quarterly cumulative dividends on the Series B Preferred Stock and the 6.875% Series C Cumulative Redeemable Preferred Stock (“Series C Preferred Stock,” and together with Series B Preferred Stock, the “Preferred Stock Issuances”) at a rate equivalent to the fixed annual rate of $1.65625 and $1.71875 per share, respectively. The table below sets forth the dividends on the Preferred Stock Issuances during the nine months ended September 30, 2018.

Quarter Ended 2018	Declaration Date	Series B Preferred Stock Per Share			Series C Preferred Stock Per Share		Payment Date
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		$	1.2890625

(1) On June 11, 2018, we gave notice to redeem all 2,800,000 issued and outstanding shares of the Series B Preferred Stock. On July 11, 2018, we 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 10, 2018, our board of directors declared the Series C Preferred Stock dividends for the quarter ending December 31, 2018 at a quarterly rate of $0.4296875 per share.

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Indebtedness Outstanding

The following table sets forth certain information with respect to our indebtedness outstanding as of September 30, 2018.

Loan	Principal Outstanding (in thousands)			Interest  Rate (1)		Maturity Date	Prepayment Terms (2)
Unsecured credit facility:
Unsecured Credit Facility (3)	$	95,000		L + 1.05%		Jan-15-2023	i
Total unsecured credit facility	95,000
Unsecured term loans:
Unsecured Term Loan C	150,000			L + 1.30%		Sep-29-2020	i
Unsecured Term Loan B	150,000			L + 1.30%		Mar-21-2021	i
Unsecured Term Loan A	150,000			L + 1.30%		Mar-31-2022	i
Unsecured Term Loan D	150,000			L + 1.30%		Jan-04-2023	i
Unsecured Term Loan E (4)	—			L + 1.20%		Jan-15-2024	i
Total unsecured term loans	600,000
Less: Total unamortized deferred financing fees and debt issuance costs	(3,915		)
Total carrying value unsecured term loans, net	596,085
Unsecured notes:
Series F Unsecured Notes	100,000			3.98	%	Jan-05-2023	ii
Series A Unsecured Notes	50,000			4.98	%	Oct-1-2024	ii
Series D Unsecured Notes	100,000			4.32	%	Feb-20-2025	ii
Series G Unsecured Notes	75,000			4.10	%	Jun-13-2025	ii
Series B Unsecured Notes	50,000			4.98	%	Jul-1-2026	ii
Series C Unsecured Notes	80,000			4.42	%	Dec-30-2026	ii
Series E Unsecured Notes	20,000			4.42	%	Feb-20-2027	ii
Series H Unsecured Notes	100,000			4.27	%	Jun-13-2028	ii
Total unsecured notes	575,000
Less: Total unamortized deferred financing fees and debt issuance costs	(2,611		)
Total carrying value unsecured notes, net	572,389
Mortgage notes (secured debt):
Wells Fargo Bank, National Association CMBS Loan	53,652			4.31	%	Dec-1-2022	iii
Thrivent Financial for Lutherans	3,824			4.78	%	Dec-15-2023	iv
Total mortgage notes	57,476
Add: Total unamortized fair market value premiums	52
Less: Total unamortized deferred financing fees and debt issuance costs	(535		)
Total carrying value mortgage notes, net	56,993
Total / weighted average interest rate (5)	$	1,320,467		3.69	%

(1) Interest rate as of September 30, 2018. At September 30, 2018, the one-month LIBOR (“L”) was 2.26056%. The 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 our consolidated leverage ratio, as defined in the respective loan agreements.

(2) 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 beginning January 1, 2016; and (iv) pre-payable without penalty three months prior to the maturity date.

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

(4) Capacity of $175.0 million, which we have until July 25, 2019 to draw.

(5) The weighted average interest rate was calculated using the fixed interest rate swapped on the notional amount of $600.0 million of debt that was in effect as of September 30, 2018, 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, 2018 was approximately $574.4 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.

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, 2018, we were in compliance with the applicable financial covenants.

On July 26, 2018, we closed on the refinancing of the unsecured credit facility. The refinancing transaction included extending the maturity date to January 15, 2023, increasing the capacity to $500.0 million, and reducing the annual interest rate. As of September 30, 2018, the interest rate on the unsecured credit facility was LIBOR plus a spread of 1.05% based on the Company’s consolidated leverage ratio, as defined in the credit agreement.

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On July 26, 2018, we entered into a $175.0 million unsecured term loan agreement. As of September 30, 2018, the interest rate on the new term loan was LIBOR plus a spread of 1.20% based on the Company's consolidated leverage ratio, as defined in the loan agreement. On July 24, 2018, we entered into four interest rate swaps with a total notional amount of $175.0 million to fix LIBOR at 2.9187% on the new unsecured term loan. The interest rate swaps will become effective on July 26, 2019 and expire on January 12, 2024.

On July 26, 2018, we entered into amendments to our unsecured term loan agreements to conform certain provisions to the new unsecured term loan agreement and the new unsecured credit facility agreement.

On April 10, 2018, we entered into a note purchase agreement for the private placement by the Operating Partnership of $75.0 million senior unsecured notes (“Series G Unsecured Notes”) maturing June 13, 2025 with a fixed annual interest rate of 4.10%, and $100.0 million senior unsecured notes (“Series H Unsecured Notes”) maturing June 13, 2028 with a fixed annual interest rate of 4.27%. We issued the Series G Unsecured Notes and the Series H Unsecured Notes on June 13, 2018. In addition, on April 10, 2018, we entered into amendments to the note purchase agreements related to our outstanding unsecured notes to conform certain provisions in the agreements to the provisions in the new note purchase agreement.

On March 28, 2018, we drew $75.0 million of the $150.0 million unsecured term loan that was entered into on July 28, 2017. On July 27, 2018, we drew the remaining $75.0 million of the $150.0 million unsecured term loan.

The chart below details our debt capital structure as of September 30, 2018.

Debt Capital Structure	September 30, 2018
Total principal outstanding (in thousands)	$	1,327,476
Weighted average duration (years)	4.9
% Secured debt	4		%
% Debt maturing next 12 months	—		%
Net Debt to Real Estate Cost Basis (1)	39		%

(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

On June 11, 2018, we gave notice to redeem all 2,800,000 issued and outstanding shares of the Series B Preferred Stock. We recognized a deemed dividend to the holders of the Series B Preferred Stock of approximately $2.7 million on the accompanying Consolidated Statements of Operations for the nine months ended September 30, 2018 related to redemption costs and the original issuance costs of the Series B Preferred Stock. On July 11, 2018, we redeemed all of the Series B Preferred Stock.

The table below sets forth our outstanding preferred stock issuances as of September 30, 2018.

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	%

The Series C Preferred Stock ranks senior to our common stock with respect to dividend rights andrights upon the liquidation, dissolution or winding up of our affairs. The Series C Preferred Stock has no stated maturity date and is not subject to mandatory redemption or any sinking fund. Generally, we are not permitted to redeem the Series C Preferred Stock prior to March 17, 2021, except in limited circumstances relating to our ability to qualify as a REIT and in certain other circumstances related to a change of control.

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Common Stock

The following sets forth our at-the-market (“ATM”) common stock offering program as of September 30, 2018. 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, 2018 (in thousands)
2017 $500 million ATM	November 13, 2017	$	500,000	$	213,217

The table below set forth the activity for the ATM common stock offering programs during the three and nine months ended September 30, 2018 (in thousands, except share data).

	Three months ended September 30, 2018
ATM Common Stock Offering Program	Shares Sold	Weighted Average Price Per Share		Gross Proceeds		Sales Agents’ Fee		Net Proceeds
2017 $500 million ATM	3,568,382	$	27.94	$	99,695	$	1,129	$	98,566
Total/weighted average	3,568,382	$	27.94	$	99,695	$	1,129	$	98,566

	Nine months ended September 30, 2018
ATM Common Stock Offering Program	Shares Sold	Weighted Average Price Per Share		Gross Proceeds		Sales Agents’ Fee		Net Proceeds
2017 $500 million ATM	10,387,962	$	26.61	$	276,457	$	2,888	$	273,569
Total/weighted average	10,387,962	$	26.61	$	276,457	$	2,888	$	273,569

Noncontrolling Interest

We own our interests in all of our properties and conduct substantially all of our business through our Operating Partnership. We are the sole member of the sole general partner of the Operating Partnership. As of September 30, 2018, we owned approximately 96.4% of the common units of our 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 3.6%.

Interest Rate Risk

We use interest rate swaps to fix the rate of our variable rate debt. As of September 30, 2018, all of our outstanding variable rate debt, with the exception of our unsecured credit facility, was fixed with interest rate swaps.

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 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.

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The following table details our outstanding interest rate swaps as of September 30, 2018.

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	$	471	1.3300	%	One-month L	Feb-14-2020
Capital One, N.A.	Jun-13-2013	Jul-01-2013	$	50,000	$	703	1.6810	%	One-month L	Feb-14-2020
Capital One, N.A.	Jun-13-2013	Aug-01-2013	$	25,000	$	344	1.7030	%	One-month L	Feb-14-2020
Regions Bank	Sep-30-2013	Feb-03-2014	$	25,000	$	245	1.9925	%	One-month L	Feb-14-2020
The Toronto-Dominion Bank	Oct-14-2015	Sep-29-2016	$	25,000	$	700	1.3830	%	One-month L	Sep-29-2020
PNC Bank, N.A.	Oct-14-2015	Sep-29-2016	$	50,000	$	1,391	1.3906	%	One-month L	Sep-29-2020
Regions Bank	Oct-14-2015	Sep-29-2016	$	35,000	$	978	1.3858	%	One-month L	Sep-29-2020
U.S. Bank, N.A.	Oct-14-2015	Sep-29-2016	$	25,000	$	695	1.3950	%	One-month L	Sep-29-2020
Capital One, N.A.	Oct-14-2015	Sep-29-2016	$	15,000	$	417	1.3950	%	One-month L	Sep-29-2020
Royal Bank of Canada	Jan-08-2015	Mar-20-2015	$	25,000	$	684	1.7090	%	One-month L	Mar-21-2021
The Toronto-Dominion Bank	Jan-08-2015	Mar-20-2015	$	25,000	$	682	1.7105	%	One-month L	Mar-21-2021
The Toronto-Dominion Bank	Jan-08-2015	Sep-10-2017	$	100,000	$	1,488	2.2255	%	One-month L	Mar-21-2021
Wells Fargo, N.A.	Jan-08-2015	Mar-20-2015	$	25,000	$	886	1.8280	%	One-month L	Mar-31-2022
The Toronto-Dominion Bank	Jan-08-2015	Feb-14-2020	$	25,000	$	271	2.4535	%	One-month L	Mar-31-2022
Regions Bank	Jan-08-2015	Feb-14-2020	$	50,000	$	520	2.4750	%	One-month L	Mar-31-2022
Capital One, N.A.	Jan-08-2015	Feb-14-2020	$	50,000	$	467	2.5300	%	One-month L	Mar-31-2022
The Toronto-Dominion Bank	Jul-20-2017	Oct-30-2017	$	25,000	$	1,054	1.8485	%	One-month L	Jan-04-2023
Royal Bank of Canada	Jul-20-2017	Oct-30-2017	$	25,000	$	1,054	1.8505	%	One-month L	Jan-04-2023
Wells Fargo, N.A.	Jul-20-2017	Oct-30-2017	$	25,000	$	1,055	1.8505	%	One-month L	Jan-04-2023
PNC Bank, N.A.	Jul-20-2017	Oct-30-2017	$	25,000	$	1,052	1.8485	%	One-month L	Jan-04-2023
PNC Bank, N.A.	Jul-20-2017	Oct-30-2017	$	50,000	$	2,105	1.8475	%	One-month L	Jan-04-2023
The Toronto-Dominion Bank	Jul-24-2018	Jul-26-2019	$	50,000	$	111	2.9180	%	One-month L	Jan-12-2024
PNC Bank, N.A.	Jul-24-2018	Jul-26-2019	$	50,000	$	106	2.9190	%	One-month L	Jan-12-2024
Bank of Montreal	Jul-24-2018	Jul-26-2019	$	50,000	$	113	2.9190	%	One-month L	Jan-12-2024
U.S. Bank, N.A.	Jul-24-2018	Jul-26-2019	$	25,000	$	57	2.9190	%	One-month L	Jan-12-2024

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, 2018, the fair value of all of our 25 interest rate swaps were in an asset position of approximately $17.6 million, including any adjustment for nonperformance risk related to these agreements.

As of September 30, 2018, we had $695.0 million of variable rate debt. As of September 30, 2018, all of our outstanding variable rate debt, with the exception of our unsecured credit facility, was fixed with interest rate swaps. 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.

Off-balance Sheet Arrangements

As of September 30, 2018, we had letters of credit related to development projects and certain other agreements of approximately $5.6 million. As of September 30, 2018, we had no other material off-balance sheet arrangements.

Item 3.  Quantitativeand 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, 2018, we had $695.0 million of variable rate debt outstanding. As of September 30, 2018, all of our outstanding variable rate debt, with the exception of $95.0 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

47

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 basispoints and assuming we had an outstanding balance of $95.0 million on our unsecured credit facility (the portion outstanding at September 30, 2018 not fixed by interest rate swaps) for the nine months ended September 30, 2018, our interest expense would have increased by approximately $0.7 million for the nine months ended September 30, 2018.

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, 2018. 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, 2018 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, 2017 filed with the SEC on February 15, 2018.

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

None.

Item 3. Defaults Upon Senior Securities

None.

Item 4.  Mine SafetyDisclosures

Not applicable.

Item 5.  Other Information

None.

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Item 6.  Exhibits

Exhibit Number	Description of Document
10.1	Credit Agreement, dated as of July 26, 2018, by and among STAG Industrial Operating Partnership, L.P., as Borrower, STAG Industrial, Inc., as a Guarantor, Wells Fargo Bank, National Association, as Administrative Agent, and the other lenders party thereto (1)
10.2	Term Loan Agreement, dated as of July 26, 2018, by and among STAG Industrial Operating Partnership, L.P., as Borrower, STAG Industrial, Inc., as a Guarantor, Wells Fargo Bank, National Association, as Administrative Agent, and the other lenders party thereto (1)
10.3	Second Amendment to Amended and Restated Term Loan Agreement, dated as of July 26, 2018, by and among STAG Industrial Operating Partnership, L.P., as Borrower, STAG Industrial, Inc., as a Guarantor, Wells Fargo Bank, National Association, as Administrative Agent, and the other lenders party thereto (1)
10.4	Second Amendment to Second Amended and Restated Term Loan Agreement, dated as of July 26, 2018, by and among STAG Industrial Operating Partnership, L.P., as Borrower, STAG Industrial, Inc., as a Guarantor, Wells Fargo Bank, National Association, as Administrative Agent, and the other lenders party thereto (1)
10.5	Third Amendment to Term Loan Agreement, dated as of July 26, 2018, by and among STAG Industrial Operating Partnership, L.P., as Borrower, STAG Industrial, Inc., as a Guarantor, Wells Fargo Bank, National Association, as Administrative Agent, and the other lenders party thereto (1)
10.6	First Amendment to Term Loan Agreement, dated as of July 26, 2018, by and among STAG Industrial Operating Partnership, L.P., as Borrower, STAG Industrial, Inc., as a Guarantor, Bank of America, N.A., as Administrative Agent, 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 *	The following materials from STAG Industrial, Inc.’s Quarterly Report on Form 10-Q for the quarter ended September 30, 2018 formatted in XBRL (eXtensible Business Reporting Language): (i) the Consolidated Balance Sheets, (ii) the Consolidated Statements of Operations, (iii) the Consolidated Statements of Comprehensive Income (Loss), (iv) the Consolidated Statements of Equity, (v) the Consolidated Statements of Cash Flows, and (vi) related notes to Consolidated Financial Statements

* Filed herewith.

(1) Incorporated by reference to STAG Industrial, Inc.’s Current Report on Form 8-K filed with the SEC on July 31, 2018.

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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: November 1, 2018	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: November 1, 2018	/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: November 1, 2018	/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, 2018 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: November 1, 2018	/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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Document and Entity Information - shares	9 Months Ended
	Sep. 30, 2018	Oct. 31, 2018
Document and Entity Information
Entity Registrant Name	STAG Industrial, Inc.
Entity Central Index Key	0001479094
Document Period End Date	Sep. 30, 2018
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Entity Emerging Growth Company	false
Entity Small Business	false
Entity Common Stock, Shares Outstanding		108,893,286
Document Fiscal Year Focus	2018
Document Fiscal Period Focus	Q3
Document Type	10-Q
Amendment Flag	false

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Consolidated Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Rental Property:
Land	$ 355,590	$ 321,560
Buildings and improvements, net of accumulated depreciation of $301,787 and $249,057, respectively	2,202,755	1,932,764
Deferred leasing intangibles, net of accumulated amortization of $237,892 and $280,642, respectively	327,734	313,253
Total rental property, net	2,886,079	2,567,577
Cash and cash equivalents	6,024	24,562
Restricted cash	5,231	3,567
Tenant accounts receivable, net	39,170	33,602
Prepaid expenses and other assets	35,122	25,364
Interest rate swaps	17,649	6,079
Assets held for sale, net	0	19,916
Total assets	2,989,275	2,680,667
Liabilities:
Unsecured credit facility	95,000	271,000
Unsecured term loans, net	596,085	446,265
Unsecured notes, net	572,389	398,234
Mortgage notes, net	56,993	58,282
Accounts payable, accrued expenses and other liabilities	53,445	43,216
Interest rate swaps	0	1,217
Tenant prepaid rent and security deposits	19,328	19,045
Dividends and distributions payable	14,530	11,880
Deferred leasing intangibles, net of accumulated amortization of $13,043 and $13,555, respectively	20,708	21,221
Total liabilities	1,428,478	1,270,360
Commitments and contingencies (Note 10)
Preferred stock, par value $0.01 per share, 15,000,000 shares authorized,
Common stock, par value $0.01 per share, 150,000,000 shares authorized, 107,825,791 and 97,012,543 shares issued and outstanding at September 30, 2018 and December 31, 2017, respectively	1,078	970
Additional paid-in capital	2,003,983	1,725,825
Cumulative dividends in excess of earnings	(589,785)	(516,691)
Accumulated other comprehensive income	16,485	3,936
Total stockholders’ equity	1,506,761	1,359,040
Noncontrolling interest	54,036	51,267
Total equity	1,560,797	1,410,307
Total liabilities and equity	2,989,275	2,680,667
Series B Preferred Stock
Preferred stock, par value $0.01 per share, 15,000,000 shares authorized,
Preferred stock	0	70,000
Series C Preferred Stock
Preferred stock, par value $0.01 per share, 15,000,000 shares authorized,
Preferred stock	$ 75,000	$ 75,000

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Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Building and Improvements	$ 301,787	$ 249,057
Deferred leasing intangibles assets, accumulated amortization	237,892	280,642
Deferred leasing intangibles liabilities, accumulated amortization	$ 13,043	$ 13,555
Preferred stock, par value (in dollars per share)	$ 0.01	$ 0.01
Preferred stock, shares authorized	15,000,000	15,000,000
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized	150,000,000	150,000,000
Common Stock, shares, issued	104,238,166	97,012,543
Common stock, shares outstanding	104,238,166	97,012,543
Series B Preferred Stock
Preferred stock, shares issued	0	2,800,000
Preferred stock, shares outstanding	0	2,800,000
Preferred stock, liquidation preference (in dollars per share)	$ 0.00	$ 25.00
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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Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Revenues [Abstract]
Rental income	$ 75,159	$ 65,673	$ 217,227	$ 186,621
Tenant recoveries	13,518	12,366	39,443	32,952
Other income	269	105	1,033	244
Total revenue	88,946	78,144	257,703	219,817
Expenses
Property	17,112	15,401	50,735	42,312
General and administrative	8,911	8,380	25,637	25,090
Property acquisition costs	0	1,386	0	4,684
Depreciation and amortization	44,355	38,186	125,221	110,286
Loss on impairments	0	0	2,934	0
Loss on involuntary conversion	0	0	0	330
Other expenses	223	58	864	1,502
Total expenses	70,601	63,411	205,391	184,204
Other income (expense)
Interest and other income	3	2	16	10
Interest expense	(12,698)	(10,446)	(35,602)	(31,557)
Loss on extinguishment of debt	(13)	(13)	(13)	(15)
Gain on the sales of rental property, net	3,239	17,563	32,276	19,225
Total other income (expense)	(9,469)	7,106	(3,323)	(12,337)
Net income	8,876	21,839	48,989	23,276
Less: income attributable to noncontrolling interest after preferred stock dividends	281	828	1,589	673
Net income attributable to STAG Industrial, Inc.	8,595	21,011	47,400	22,603
Less: preferred stock dividends	1,289	2,449	6,315	7,345
Less: redemption of preferred stock	0	0	2,661	0
Less: amount allocated to participating securities	69	84	209	250
Net income attributable to common stockholders	$ 7,237	$ 18,478	$ 38,215	$ 15,008
Weighted average common shares outstanding — basic	105,783	92,787	101,095	87,632
Weighted average common shares outstanding — diluted	106,333	93,435	101,495	88,238
Net income per share — basic and diluted
Net income per share attributable to common stockholders — basic	$ 0.07	$ 0.20	$ 0.38	$ 0.17
Net income per share attributable to common stockholders — diluted	$ 0.07	$ 0.20	$ 0.38	$ 0.17

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Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Statement of Comprehensive Income [Abstract]
Net income	$ 8,876	$ 21,839	$ 48,989	$ 23,276
Other comprehensive income:
Income on interest rate swaps	2,060	598	12,811	300
Other comprehensive income	2,060	598	12,811	300
Comprehensive income	10,936	22,437	61,800	23,576
Income attributable to noncontrolling interest after preferred stock dividends	(281)	(828)	(1,589)	(673)
Other comprehensive income attributable to noncontrolling interest	(76)	(26)	(509)	(13)
Comprehensive income attributable to STAG Industrial, Inc.	$ 10,579	$ 21,583	$ 59,702	$ 22,890

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Consolidated Statements of Equity - USD ($) $ in Thousands	Total	Preferred Stock	Common Stock	Additional Paid-in Capital	Common Stock Dividends in excess of Earnings	Accumulated Other Comprehensive Income (Loss)	Total Stockholders' Equity	Noncontrolling Interest - Unit holders in Operating Partnership
Balance at Dec. 31, 2016	$ 1,066,926	$ 145,000	$ 804	$ 1,293,706	$ (410,978)	$ (1,496)	$ 1,027,036	$ 39,890
Balance (in shares) at Dec. 31, 2016			80,352,304
Increase (Decrease) in Stockholders' Equity
Proceeds from sales of common stock	339,624		$ 132	339,492			339,624
Proceeds from sales of common stock (in shares)			13,165,996
Offering costs	(4,746)			(4,746)			(4,746)
Dividends, Preferred Stock		0
Dividends, Common Stock					100,509
Dividends							100,509
Dividends and Distributions, Net	105,441
Distribution Made to Limited Partner, Cash Distributions Declared								4,932
Non-cash compensation activity, net	6,226			2,911			2,717	3,509
Non-cash compensation activity (in shares)			43,492
Non-cash compensation activity (in excess of earnings)			$ 0		(194)
Redemption of common units to common stock			$ 3	3,314			3,317	(3,317)
Redemption of common units to common stock (in shares)			300,991
Issuance of units	18,558							18,558
Rebalancing of noncontrolling interest				3,632			3,632	(3,632)
Other comprehensive income	300					287	287	13
Net income	23,276	0			22,603		22,603	673
Balance at Sep. 30, 2017	1,344,723	145,000	$ 939	1,638,309	(489,078)	(1,209)	1,293,961	50,762
Balance (in shares) at Sep. 30, 2017			93,862,783
Balance at Dec. 31, 2016	1,066,926	145,000	$ 804	1,293,706	(410,978)	(1,496)	1,027,036	$ 39,890
Balance (in shares) at Dec. 31, 2016			80,352,304
Increase (Decrease) in Stockholders' Equity
Redemption of common units to common stock (in shares)								0
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
Cash flow hedging instruments cumulative effect adjustment (Note 2)					(258)	247	(11)	11
Proceeds from sales of common stock	276,457		$ 104	276,353			276,457
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)	0
Offering costs	(3,129)			(3,129)			(3,129)
Dividends, Preferred Stock		0
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					0
Rebalancing of noncontrolling interest				(6,434)			(6,434)	$ 6,434
Other comprehensive income	12,811					12,302	12,302	509
Net income	48,989	0			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			107,825,791.000

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Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Cash flows from operating activities:
Net income	$ 8,876	$ 21,839	$ 48,989	$ 23,276
Adjustment to reconcile net income to net cash provided by operating activities:
Depreciation and amortization			125,221	110,286
Loss on impairments	0	0	2,934	0
Loss on involuntary conversion			0	330
Non-cash portion of interest expense			1,698	1,465
Intangible amortization in rental income, net	1,150	1,318	3,206	3,873
Straight-line rent adjustments, net			(8,297)	(4,855)
Dividends on forfeited equity compensation			15	2
Loss on extinguishment of debt	(13)	(13)	(13)	(15)
Gain on the sales of rental property, net			(32,276)	(19,225)
Non-cash compensation expense			6,671	7,159
Change in assets and liabilities:
Tenant accounts receivable, net			501	(955)
Prepaid expenses and other assets			(9,597)	(10,479)
Accounts payable, accrued expenses and other liabilities			9,249	5,572
Tenant prepaid rent and security deposits			283	3,570
Total adjustments			99,621	96,758
Net cash provided by operating activities			148,610	120,034
Cash flows from investing activities:
Acquisitions of land and buildings and improvements			(382,981)	(405,790)
Additions of land and building and improvements			(23,578)	(27,539)
Acquisitions of other assets			794	0
Acquisitions of other liabilities			(242)	0
Proceeds from sales of rental property, net			89,407	43,454
Proceeds from insurance on involuntary conversion			0	857
Acquisition deposits, net			(695)	685
Acquisitions of deferred leasing intangibles			(74,851)	(79,961)
Net cash used in investing activities			(393,250)	(468,294)
Cash flows from financing activities:
Proceeds from unsecured credit facility			643,000	538,000
Repayment of unsecured credit facility			(819,000)	(321,000)
Proceeds from unsecured term loans			150,000	0
Proceeds from unsecured notes			175,000	0
Repayment of mortgage notes			(1,379)	(105,027)
Payment of loan fees and costs			(4,451)	(1,185)
Dividends and distributions			117,146	103,655
Proceeds from sales of common stock			276,457	339,624
Redemption of preferred stock			70,000	0
Dividends and distributions			(1,524)	(969)
Offering costs			(3,191)	(4,746)
Net cash provided by financing activities			227,766	341,042
Decrease in cash and cash equivalents and restricted cash			(16,874)	(7,218)
Cash and cash equivalents and restricted cash—beginning of period			28,129	21,805	$ 21,805
Cash and cash equivalents and restricted cash—end of period	11,255	14,587	11,255	14,587	28,129
Supplemental disclosure:
Cash paid for interest, net of capitalized interest			31,875	30,476
Supplemental schedule of non-cash investing and financing activities
Issuance of units for acquisitions of land and building and improvements and deferred leasing intangibles			0	18,558
Acquisitions of land and buildings and improvements			232	17,304
Acquisitions of deferred leasing intangibles			48	2,064
Partial disposal of building due to involuntary conversion of building			0	363
Investing other receivables due to involuntary conversion of building			0	(363)
Change in additions of land, building, and improvements included in accounts payable, accrued expenses, and other liabilities			(1,475)	(13,201)
Additions to building and other capital improvements from non-cash compensation			(20)	(24)
Change in loan fees, costs, and offering costs included in accounts payable, accrued expenses, and other liabilities			48	30
Reclassification of preferred stock called for redemption to liability			70,000	0
Dividends and distributions payable	$ 14,530	$ 11,516	$ 14,530	$ 11,516	$ 11,880

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Organization and Description of Business

9 Months Ended

Sep. 30, 2018

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Organization and Description of Business

OrganizationandDescription 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, 2018 and December 31, 2017, the Company owned a 96.4% and 95.9%, 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, 2018, the Company owned 381 buildings in 37 states with approximately 75.4 million rentable square feet, consisting of 313 warehouse/distribution buildings, 59 light manufacturing buildings, and 9 flex/office buildings. The Company’s buildings were approximately 95.4% leased to 330 tenants as of September 30, 2018.

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Summary of Significant Accounting Policies

9 Months Ended

Sep. 30, 2018

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, 2017.

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 (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.

Reclassifications and New Accounting Standards

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

New Accounting Standards Adopted

In August 2017, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) 2017-12, Derivatives and Hedging (Topic 815):Targeted Improvements to Accounting for Hedging Activities. The purpose of this updated guidance is to better align a company’s financial reporting for hedging activities with the economic objectives of those activities. This standard is effective for fiscal years beginning after December 15, 2018 and interim periods within those years, with early adoption permitted, and the Company adopted this standard effective January 1, 2018 using the modified retrospective transition method. The adoption of this standard resulted in a cumulative effect adjustment of approximately $0.3 million recorded as an increase to cumulative dividends in excess of earnings and an increase to accumulated other comprehensive income as of January 1, 2018 in the accompanying Consolidated Statements of Equity.

In May 2017, the FASB issued ASU 2017-09, Stock Compensation (Topic 718): Scope of Modification Accounting, which provides updated guidance about which changes to the terms or conditions of a share-based payment award would require an entity to apply modification accounting under the topic. This standard is effective for fiscal years beginning after December 15, 2017 and interim periods within those years, and the Company adopted this standard prospectively effective January 1, 2018. The adoption of this standard did not have a material effect on the Company's consolidated financial statements.

In February 2017, the FASB issued ASU 2017-05, Other Income - Gains and Losses from the Derecognition of Nonfinancial Assets (Subtopic 610-20): Clarifying the Scope of Asset Derecognition Guidance and Accounting for Partial Sales of Nonfinancial Assets, which provides guidance for recognizing gains and losses from the transfer of nonfinancial assets in contracts with non-customers. The new standard was issued as part of the new revenue standard (ASU 2014-09, as discussed below), and defines “in substance nonfinancial asset,” unifies guidance related to partial sales of nonfinancial assets, eliminates rules specifically addressing sales of real estate, removes exceptions to the financial asset derecognition model, and clarifies the accounting for contributions of nonfinancial assets to joint ventures. As a result of the new guidance, the guidance specific to real estate sales in Subtopic 360-20 was eliminated, and sales and partial sales of real estate assets will now be subject to the same derecognition model as all other nonfinancial assets. This standard is effective at the same time an entity adopts ASU 2014-09, which the Company adopted effective January 1, 2018. The Company adopted this standard effective January 1, 2018 using the modified retrospective approach. The adoption of this standard did not have a material effect on the Company's consolidated financial statements.

In January 2017, the FASB issued ASU 2017-01, Business Combinations (Topic 805): Clarifying the Definition of a Business. The new standard provides a screen to determine when a set of assets and activities is not a business. The screen requires that when substantially all of the fair value of the gross assets acquired or disposed of is concentrated in a single identifiable asset or a group of similar identifiable assets, the set is not a business. This standard is effective for annual periods beginning after December 15, 2017 and interim periods within those periods, and the Company adopted this standard prospectively effective January 1, 2018. As a result, it is expected that the majority of the Company's acquisitions will be accounted for as asset acquisitions, whereas under the former guidance the majority of the Company's acquisitions had been accounted for as business combinations. The most significant difference between the two accounting models that impacts the Company's consolidated financial statements is that in an asset acquisition, property acquisition costs are generally a component of the consideration transferred to acquire a group of assets and are capitalized as a component of the cost of the assets, whereas in a business combination, property acquisition costs are expensed and not included as part of the consideration transferred.

In November 2016, the FASB issued ASU 2016-18, Statement of Cash Flows (Topic 230): Restricted Cash.The new standard requires that the statement of cash flows explain the changes during the period in the total of cash, cash equivalents, and amounts generally described as restricted cash or restricted cash equivalents. This standard is effective for fiscal years beginning after December 15, 2017 and the Company adopted this standard effective January 1, 2018. As a result, the Company has included restricted cash with cash and cash equivalents when reconciling the beginning and end of period total amounts on the accompanying Consolidated Statements of Cash Flows. The effects of this standard were applied retrospectively to all prior periods presented. For the nine months ended September 30, 2017, the effect of the change in accounting principle was a decrease in cash provided by operating activities of approximately $0.5 million and an increase in cash used in investing activities of approximately $5.6 million on the accompanying Consolidated Statements of Cash Flows.

In January 2016, the FASB issued ASU 2016-01, Recognition and Measurement of Financial Assets and Financial Liabilities (Subtopic 825-10). The amendments in ASU 2016-01 address certain aspects of recognition, measurement, presentation, and disclosure of financial instruments. The standard primarily affects the accounting for equity investments, financial liabilities under the fair value option, and the presentation and disclosure requirements for financial instruments. ASU 2016-01 is effective for the annual periods beginning after December 31, 2017 and for annual periods and interim periods within those years, and the Company adopted this standard prospectively effective January 1, 2018. The adoption of this standard did not have a material effect on the Company's consolidated financial statements.

In May 2014, the FASB issued ASU 2014-09, Revenue from Contracts with Customers(Topic 606). ASU 2014-09 is a comprehensive new revenue recognition model requiring a company to recognize revenue to depict the transfer of goods or services to a customer at an amount reflecting the consideration it expects to receive in exchange for those goods or services. Additionally, the new revenue guidance requires improved disclosures regarding the nature, amount, timing and uncertainty of revenue and cash flows arising from contracts with customers. The Company adopted this standard effective January 1, 2018 using the modified retrospective approach. The adoption of this standard did not have a material effect on the Company's consolidated financial statements.

New Accounting Standards Issued but not yet Adopted

In February 2016, the FASB issued ASU 2016-02, Leases (Topic 842), and various subsequent ASU’s, which sets 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 supersedes 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 will determine 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 will be accounted for similar to existing guidance for operating leases today. The new standard requires lessors to account for leases using an approach that is substantially equivalent to existing guidance for sales-type leases, direct financing leases and operating leases. ASU 2016-02 is expected to impact the Company’s consolidated financial statements as the Company has certain operating and land lease arrangements for which it is the lessee, which will result in the recording of a right of use asset and the related lease liability. The standard is effective for fiscal years beginning after December 15, 2018, including interim periods within those fiscal years, with early adoption permitted. The new standard must be adopted using the modified retrospective transition method by recognizing a cumulative effect adjustment to the opening balance of cumulative dividends in excess of earnings, by either applying the new guidance at the beginning of the earliest comparative period or by applying the new guidance at the adoption date. The Company intends to adopt available practical expedients which allows the Company to 1) not reassess whether any expired or existing contracts are or contain leases; 2) not reassess the lease classification for any expired or existing leases; and 3) not reassess initial direct costs for any existing leases. The Company is currently in the process of evaluating the impact the adoption of ASU 2016-02 will have on the Company’s financial position or results of operations, and plans to adopt this standard effective January 1, 2019.

In May 2014, the FASB issued ASU 2014-09, Revenue from Contracts with Customers(Topic 606), which the Company adopted on January 1, 2018, as discussedin “New Accounting Standards Adopted” above. While lease contracts with customers, which constitute a vast majority of the Company’s revenues, are specifically excluded from the model’s scope, once the new leases standard under ASU 2016-02 is adopted by the Company, the new revenue standard may apply to executory costs and other components of revenue due under leases that are deemed to be non-lease components (such as common area maintenance and provision of utilities), even when the revenue for such activities is not separately stipulated in the lease. In that case, revenue from these items previously recognized on a straight-line basis under current lease guidance would be recognized under the new revenue guidance as the related services are delivered. As a result, while the total revenue recognized over time would not differ under the new guidance, the recognition pattern may be different. In July 2018, the FASB issued 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. Otherwise, the company should account for the combined component as an operating lease in accordance with Topic 842. The Company is currently in the process of evaluating the impact the adoption of ASU 2016-02 will have on the Company’s financial position or results of operations, and plans to adopt this standard effective January 1, 2019.

Restricted Cash

Restricted cash may include tenant security deposits and cash held in escrow for real estate taxes and capital improvements as required in various mortgage note agreements. Restricted cash also may include amounts held by the Company’s transfer agent for preferred stock dividends that are distributed subsequent to period end. 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, 2018		December 31, 2017
Cash and cash equivalents	$	6,024	$	24,562
Restricted cash	5,231		3,567
Total cash and cash equivalents and restricted cash	$	11,255	$	28,129

Tenant Accounts Receivable, net

As of September 30, 2018 and December 31, 2017, the Company had an allowance for doubtful accounts of approximately $0.6 million and $0.1 million, respectively.

As of September 30, 2018 and December 31, 2017, the Company had accrued rental income, net of allowance of approximately $30.7 million and $24.7 million, respectively. As of September 30, 2018 and December 31, 2017, the Company had an allowance on accrued rental income of $0.2 million and $0.2 million, respectively.

As of September 30, 2018 and December 31, 2017, the Company had approximately $14.6 million and $12.7 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, 2018 and December 31, 2017, 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, 2018 and December 31, 2017, the Company's total liability associated with these lease security deposits was approximately $8.7 million and $8.1 million, respectively, and is included in tenant prepaid rent and security deposits on the accompanying Consolidated Balance Sheets.

Revenue Recognition

Tenant Recoveries

The Company estimates that 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, were approximately $3.8 million, $10.9 million, $2.9 million and $9.2 million for the three and nine months ended September 30, 2018 and 2017, 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.

Gain on the Sales of Rental Property, net

The timing of the derecognition of a rental property and the corresponding recognition of gain on the sales of rental property, net is measured by various criteria related to the terms of the sale transaction, and if the Company has lost control of the property and the acquirer has gained control of the property after the transaction. If the derecognition criteria is met, the full gain is recognized.

Taxes

Federal Income Taxes

The Company's taxable REIT subsidiaries recognized a net loss of approximately $22,000, $0.1 million, $0.2 million and $0.4 million for the three and nine months ended September 30, 2018 and 2017, 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 $0.1 million, $0.6 million, $0.3 million and $0.7 million have been recorded in other expenses on the accompanying Consolidated Statements of Operations for the three and nine months ended September 30, 2018 and 2017, respectively.

Uncertain Tax Positions

As of September 30, 2018 and December 31, 2017, there were no liabilities for uncertain tax positions.

Concentrations of Credit Risk

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

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Rental Property

9 Months Ended

Sep. 30, 2018

Real Estate [Abstract]

Rental Property

Rental Property

The following table summarizes the components of rental property as of September 30, 2018 and December 31, 2017.

Rental Property (in thousands)	September 30, 2018		December 31, 2017
Land	$	355,590	$	321,560
Buildings, net of accumulated depreciation of $190,538 and $160,281, respectively	2,006,013		1,756,579
Tenant improvements, net of accumulated depreciation of $35,495 and $32,714, respectively	30,577		30,138
Building and land improvements, net of accumulated depreciation of $75,754 and $56,062, respectively	160,496		143,170
Construction in progress	5,669		2,877
Deferred leasing intangibles, net of accumulated amortization of $237,892 and $280,642, respectively	327,734		313,253
Total rental property, net	$	2,886,079	$	2,567,577

Acquisitions

The following table summarizes the acquisitions of the Company during the three and nine months ended September 30, 2018.

Market (1)	Date Acquired	Square Feet	Buildings	Purchase Price (in thousands)
Greenville/Spartanburg, SC	January 11, 2018	203,000	1	$	10,755
Minneapolis/St Paul, MN	January 26, 2018	145,351	1	13,538
Philadelphia, PA	February 1, 2018	278,582	1	18,277
Houston, TX	February 22, 2018	242,225	2	22,478
Greenville/Spartanburg, SC	March 30, 2018	222,710	1	13,773
Three months ended March 31, 2018		1,091,868	6	78,821
Chicago, IL	April 23, 2018	169,311	2	10,975
Milwaukee/Madison, WI	April 26, 2018	53,680	1	4,316
Pittsburgh, PA	April 30, 2018	175,000	1	15,380
Detroit, MI	May 9, 2018	274,500	1	19,328
Minneapolis/St Paul, MN	May 15, 2018	509,910	2	26,983
Cincinnati/Dayton, OH	May 23, 2018	158,500	1	7,317
Baton Rouge, LA	May 31, 2018	279,236	1	21,379
Las Vegas, NV	June 12, 2018	122,472	1	17,920
Greenville/Spartanburg, SC	June 15, 2018	131,805	1	5,621
Denver, CO	June 18, 2018	64,750	1	7,044
Cincinnati/Dayton, OH	June 25, 2018	465,136	1	16,421
Charlotte, NC	June 29, 2018	69,200	1	5,446
Houston, TX	June 29, 2018	252,662	1	27,170
Three months ended June 30, 2018		2,726,162	15	185,300
Knoxville, TN	July 10, 2018	106,000	1	6,477
Pittsburgh, PA	August 2, 2018	265,568	1	19,186
Raleigh/Durham, NC	August 2, 2018	365,000	1	21,067
Detroit, MI	August 6, 2018	439,150	1	21,077
Des Moines, IA	August 8, 2018	121,922	1	6,053
McAllen/Edinburg/Pharr, TX	August 9, 2018	270,084	1	18,523
Pittsburgh, PA	August 15, 2018	200,500	1	11,327
Minneapolis/St Paul, MN	August 24, 2018	120,606	1	8,422
Milwaukee/Madison, WI	September 28, 2018	100,800	1	7,484
Milwaukee/Madison, WI	September 28, 2018	174,633	2	13,288
Chicago, IL	September 28, 2018	105,637	1	6,368
Indianapolis, IN	September 28, 2018	478,721	1	29,085
Augusta/Richmond County, GA	September 28, 2018	203,726	1	9,379
Charlotte, NC	September 28, 2018	301,000	1	16,807
Three months ended September 30, 2018		3,253,347	15	194,543
Nine months ended September 30, 2018		7,071,377	36	$	458,664

(1) As defined by CoStar Realty Information Inc.

The following table summarizes the allocation of the consideration paid at the date of acquisition during the nine months ended September 30, 2018 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	$	39,340		N/A
Buildings	317,293			N/A
Tenant improvements	4,849			N/A
Building and land improvements	21,731			N/A
Deferred leasing intangibles - In-place leases	52,276			8.7
Deferred leasing intangibles - Tenant relationships	21,861			11.8
Deferred leasing intangibles - Above market leases	4,062			8.2
Deferred leasing intangibles - Below market leases	(3,122		)	6.7
Deferred leasing intangibles - Above market ground leases	(178		)	48.1
Other assets	794			N/A
Other liabilities	(242		)	N/A
Total purchase price	$	458,664

The table below sets forth the results of operations for the three and nine months ended September 30, 2018 for the buildings acquired during the nine months ended September 30, 2018 included in the Company’s Consolidated Statements of Operations from the date of acquisition.

Results of Operations (in thousands)	Three months ended September 30, 2018		Nine months ended September 30, 2018
Total revenue	$	7,122	$	11,156
Net income	$	1,556	$	1,642

Dispositions

During the nine months ended September 30, 2018, the Company sold 11 buildings comprised of approximately 2.0 million square feet with a net book value of approximately $57.1 million to third parties. These buildings contributed approximately $0.1 million, $2.7 million, $2.6 million and $7.7 million to revenue for the three and nine months ended September 30, 2018 and 2017, respectively. These buildings contributed approximately $5,000, $0.1 million, $0.5 million and $1.4 million to net income (exclusive of loss on involuntary conversion, loss on impairments, and gain on the sales of rental property, net) for the three and nine months ended September 30, 2018 and 2017, respectively. Net proceeds from the sales of rental property were approximately $89.4 million and the Company recognized the full gain on the sales of rental property, net of approximately $32.3 million for the nine months ended September 30, 2018.

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, 2018.

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)
Buena Vista, VA(4)	1	Change in estimated hold period	(5)	Discounted cash flows	(6)
Sergeant Bluff, IA(4)	1	Change in estimated hold period	(5)	Discounted cash flows	(6)
Three months ended March 31, 2018						$	3,176	$	2,934
Nine months ended September 30, 2018						$	3,176	$	2,934

(1) As defined by CoStar Realty Information Inc.

(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 assets held and used 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) These buildings do not have markets as defined by CoStar Realty Information Inc.

(5) This property was sold during the nine months ended September 30, 2018.

(6) Level 3 inputs used to determine fair value for the impaired assets held and used for the three months ended March 31, 2018: discount rates ranged from 11.0% to 14.5% and exit capitalization rates ranged from 11.0% to 13.0%.

Deferred Leasing Intangibles

The following table sets forth the deferred leasing intangibles on the accompanying Consolidated Balance Sheets as of September 30, 2018 and December 31, 2017.

	September 30, 2018							December 31, 2017
Deferred Leasing Intangibles (in thousands)	Gross		Accumulated Amortization			Net		Gross		Accumulated Amortization			Net
Above market leases	$	70,454	$	(31,663	)	$	38,791	$	78,558	$	(36,810	)	$	41,748
Other intangible lease assets	495,172		(206,229		)	288,943		515,337		(243,832		)	271,505
Total deferred leasing intangible assets	$	565,626	$	(237,892	)	$	327,734	$	593,895	$	(280,642	)	$	313,253
Below market leases	$	33,751	$	(13,043	)	$	20,708	$	34,776	$	(13,555	)	$	21,221
Total deferred leasing intangible liabilities	$	33,751	$	(13,043	)	$	20,708	$	34,776	$	(13,555	)	$	21,221

The following table sets forth 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, 2018 and 2017.

	Three months ended September 30,				Nine months ended September 30,
Deferred Leasing Intangibles Amortization (in thousands)	2018		2017		2018		2017
Net decrease to rental income related to above and below market lease amortization	$	1,150	$	1,318	$	3,206	$	3,873
Amortization expense related to other intangible lease assets	$	20,361	$	17,934	$	56,698	$	53,747

The following table sets forth the amortization of deferred leasing intangibles over the next five calendar years beginning with 2018 as of September 30, 2018.

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 2018	$	17,263	$	927
2019	$	57,841	$	3,926
2020	$	47,750	$	3,546
2021	$	37,229	$	2,163
2022	$	29,690	$	1,154

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Debt

9 Months Ended

Sep. 30, 2018

Debt Disclosure [Abstract]

Debt

Debt

The following table sets forth a summary of 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, 2018 and December 31, 2017.

Loan	Principal Outstanding as of September 30, 2018 (in thousands)			Principal Outstanding as of December 31, 2017 (in thousands)			Interest  Rate (1)		Maturity Date	Prepayment Terms (2)
Unsecured credit facility:
Unsecured Credit Facility (3)	$	95,000		$	271,000		L + 1.05%		Jan-15-2023	i
Total unsecured credit facility	95,000			271,000
Unsecured term loans:
Unsecured Term Loan C	150,000			150,000			L + 1.30%		Sep-29-2020	i
Unsecured Term Loan B	150,000			150,000			L + 1.30%		Mar-21-2021	i
Unsecured Term Loan A	150,000			150,000			L + 1.30%		Mar-31-2022	i
Unsecured Term Loan D	150,000			—			L + 1.30%		Jan-04-2023	i
Unsecured Term Loan E (4)	—			—			L + 1.20%		Jan-15-2024	i
Total unsecured term loans	600,000			450,000
Less: Total unamortized deferred financing fees and debt issuance costs	(3,915		)	(3,735		)
Total carrying value unsecured term loans, net	596,085			446,265
Unsecured notes:
Series F Unsecured Notes	100,000			100,000			3.98	%	Jan-05-2023	ii
Series A Unsecured Notes	50,000			50,000			4.98	%	Oct-1-2024	ii
Series D Unsecured Notes	100,000			100,000			4.32	%	Feb-20-2025	ii
Series G Unsecured Notes	75,000			—			4.10	%	Jun-13-2025	ii
Series B Unsecured Notes	50,000			50,000			4.98	%	Jul-1-2026	ii
Series C Unsecured Notes	80,000			80,000			4.42	%	Dec-30-2026	ii
Series E Unsecured Notes	20,000			20,000			4.42	%	Feb-20-2027	ii
Series H Unsecured Notes	100,000			—			4.27	%	Jun-13-2028	ii
Total unsecured notes	575,000			400,000
Less: Total unamortized deferred financing fees and debt issuance costs	(2,611		)	(1,766		)
Total carrying value unsecured notes, net	572,389			398,234
Mortgage notes (secured debt):
Wells Fargo Bank, National Association CMBS Loan	53,652			54,949			4.31	%	Dec-1-2022	iii
Thrivent Financial for Lutherans	3,824			3,906			4.78	%	Dec-15-2023	iv
Total mortgage notes	57,476			58,855
Add: Total unamortized fair market value premiums	52			61
Less: Total unamortized deferred financing fees and debt issuance costs	(535		)	(634		)
Total carrying value mortgage notes, net	56,993			58,282
Total / weighted average interest rate (5)	$	1,320,467		$	1,173,781		3.69	%

(1) Interest rate as of September 30, 2018. At September 30, 2018, the one-month LIBOR (“L”) was 2.26056%. The 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 consolidated leverage ratio, as defined in the respective loan agreements.

(2) 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 beginning January 1, 2016; and (iv) pre-payable without penalty three months prior to the maturity date.

(3) 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 $3.4 million and $1.5 million is included in prepaid expenses and other assets on the accompanying Consolidated Balance Sheets as of September 30, 2018 and December 31, 2017, respectively.

(4) Capacity of $175.0 million, which the Company has until July 25, 2019 to draw.

(5) The weighted average interest rate was calculated using the fixed interest rate swapped on the notional amount of $600.0 million of debt that was in effect as of September 30, 2018, 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, 2018 was approximately $574.4 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 $7.7 million and $5.6 million as of September 30, 2018 and December 31, 2017, respectively, and is included in accounts payable, accrued expenses and other liabilities on the accompanying Consolidated Balance Sheets.

The table below sets forth 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, 2018 and 2017.

	Three months ended September 30,				Nine months ended September 30,
Costs Included in Interest Expense (in thousands)	2018		2017		2018		2017
Amortization of deferred financing fees and debt issuance costs and fair market value premiums	$	617	$	546	$	1,698	$	1,553
Facility fees and unused fees	$	275	$	286	$	928	$	839

On July 26, 2018, the Company closed on the refinancing of its unsecured credit facility. The refinancing transaction included extending the maturity date to January 15, 2023, increasing the capacity to $500.0 million, and reducing the annual interest rate. As of September 30, 2018, the interest rate on the unsecured credit facility was LIBOR plus a spread of 1.05% based on the Company’s consolidated leverage ratio, as defined in the credit agreement. The Company recognized a loss of approximately $13,000 as a result of the acceleration of unamortized deferred financing fees, which is included in loss on extinguishment of debt in the accompanying Consolidated Statements of Operations. The remaining unamortized deferred financing fees were carried over and will be amortized with any new deferred financing fees through the new maturity date of the unsecured credit facility. As of September 30, 2018, the unsecured credit facility has an annual facility fee of 0.15% based on the Company’s consolidated leverage ratio, as defined in the credit agreement, of total commitments that is due and payable quarterly. The Company also is required to pay an annual fee of $50,000.

On July 26, 2018, the Company entered into a $175.0 million unsecured term loan agreement ("Unsecured Term Loan E"). As of September 30, 2018, the interest rate on the Unsecured Term Loan E was LIBOR plus a spread of 1.20% based on the Company's consolidated leverage ratio, as defined in the loan agreement. Unless otherwise terminated pursuant to the loan agreement, the Unsecured Term Loan E will mature on January 15, 2024. The Unsecured Term Loan E has an accordion feature that allows the Company to increase its borrowing capacity to $350.0 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 25, 2019. To the extent that the Company does not request advances of the $175.0 million of aggregate commitments by July 25, 2019, the unadvanced commitments terminate. The Unsecured Term Loan E has an unused commitment fee equal to 0.15% of its unused commitments, which began to accrue on October 24, 2018 and is due and payable monthly until the earlier of (i) the date that commitments of $175.0 million have been fully advanced, (ii) July 26, 2019, and (iii) the date that commitments of $175.0 million have been reduced to zero pursuant to the terms of the agreement. The Company also is required to pay an annual fee of $35,000. The Company and certain wholly owned subsidiaries of the Operating Partnership are guarantors of the Unsecured Term Loan E. The agreement also contains financial and other covenants substantially similar to the covenants in the Company's unsecured credit facility.

On July 26, 2018, the Company entered into amendments to its unsecured term loan agreements to conform certain provisions to the Unsecured Term Loan E agreement and the new unsecured credit facility agreement.

On April 10, 2018, the Company entered into a note purchase agreement (“NPA”) for the private placement by the Operating Partnership of $75.0 million senior unsecured notes (“Series G Unsecured Notes”) maturing June 13, 2025 with a fixed annual interest rate of 4.10%, and $100.0 million senior unsecured notes (“Series H Unsecured Notes”) maturing June 13, 2028 with a fixed annual interest rate of 4.27%. The NPA contains a number of financial covenants substantially similar to the financial covenants contained in the Company’s unsecured credit facility and other unsecured notes. The Operating Partnership issued the Series G Unsecured Notes and the Series H Unsecured Notes on June 13, 2018. In addition, on April 10, 2018, the Company entered into amendments to the note purchase agreements related to the Company’s outstanding unsecured notes to conform certain provisions in the agreements to the provisions in the NPA.

On March 28, 2018, the Company drew $75.0 million of the $150.0 million unsecured term loan that was entered into on July 28, 2017. On July 27, 2018, the Company drew the remaining $75.0 million of the $150.0 million unsecured term loan.

Financial Covenant Considerations

The Company was in compliance with all financial and other covenants as of September 30, 2018 and December 31, 2017 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 $88.4 million and $90.9 million at September 30, 2018 and December 31, 2017, respectively, and is limited to senior, property-level secured debt financing arrangements.

Fair Value of Debt

The following table presents the aggregate principal outstanding under the Company’s debt arrangements and the corresponding estimate of fair value as of September 30, 2018 and December 31, 2017 (in thousands).

	September 30, 2018					December 31, 2017
	Principal Outstanding			Fair Value		Principal Outstanding			Fair Value
Unsecured credit facility	$	95,000		$	95,000	$	271,000		$	271,528
Unsecured term loans	600,000			607,663		450,000			451,463
Unsecured notes	575,000			569,493		400,000			415,599
Mortgage notes	57,476			57,608		58,855			59,769
Total principal amount	1,327,476			$	1,329,764	1,179,855			$	1,198,359
Add: Total unamortized fair market value premiums	52					61
Less: Total unamortized deferred financing fees and debt issuance costs	(7,061		)			(6,135		)
Total carrying value	$	1,320,467				$	1,173,781

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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Use of Derivative Financial Instruments

9 Months Ended

Sep. 30, 2018

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Use of Derivative Financial Instruments

Use of 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 details the Company’s outstanding interest rate swaps as of September 30, 2018. 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	$	471	1.3300	%	One-month L	Feb-14-2020
Capital One, N.A.	Jun-13-2013	Jul-01-2013	$	50,000	$	703	1.6810	%	One-month L	Feb-14-2020
Capital One, N.A.	Jun-13-2013	Aug-01-2013	$	25,000	$	344	1.7030	%	One-month L	Feb-14-2020
Regions Bank	Sep-30-2013	Feb-03-2014	$	25,000	$	245	1.9925	%	One-month L	Feb-14-2020
The Toronto-Dominion Bank	Oct-14-2015	Sep-29-2016	$	25,000	$	700	1.3830	%	One-month L	Sep-29-2020
PNC Bank, N.A.	Oct-14-2015	Sep-29-2016	$	50,000	$	1,391	1.3906	%	One-month L	Sep-29-2020
Regions Bank	Oct-14-2015	Sep-29-2016	$	35,000	$	978	1.3858	%	One-month L	Sep-29-2020
U.S. Bank, N.A.	Oct-14-2015	Sep-29-2016	$	25,000	$	695	1.3950	%	One-month L	Sep-29-2020
Capital One, N.A.	Oct-14-2015	Sep-29-2016	$	15,000	$	417	1.3950	%	One-month L	Sep-29-2020
Royal Bank of Canada	Jan-08-2015	Mar-20-2015	$	25,000	$	684	1.7090	%	One-month L	Mar-21-2021
The Toronto-Dominion Bank	Jan-08-2015	Mar-20-2015	$	25,000	$	682	1.7105	%	One-month L	Mar-21-2021
The Toronto-Dominion Bank	Jan-08-2015	Sep-10-2017	$	100,000	$	1,488	2.2255	%	One-month L	Mar-21-2021
Wells Fargo, N.A.	Jan-08-2015	Mar-20-2015	$	25,000	$	886	1.8280	%	One-month L	Mar-31-2022
The Toronto-Dominion Bank	Jan-08-2015	Feb-14-2020	$	25,000	$	271	2.4535	%	One-month L	Mar-31-2022
Regions Bank	Jan-08-2015	Feb-14-2020	$	50,000	$	520	2.4750	%	One-month L	Mar-31-2022
Capital One, N.A.	Jan-08-2015	Feb-14-2020	$	50,000	$	467	2.5300	%	One-month L	Mar-31-2022
The Toronto-Dominion Bank	Jul-20-2017	Oct-30-2017	$	25,000	$	1,054	1.8485	%	One-month L	Jan-04-2023
Royal Bank of Canada	Jul-20-2017	Oct-30-2017	$	25,000	$	1,054	1.8505	%	One-month L	Jan-04-2023
Wells Fargo, N.A.	Jul-20-2017	Oct-30-2017	$	25,000	$	1,055	1.8505	%	One-month L	Jan-04-2023
PNC Bank, N.A.	Jul-20-2017	Oct-30-2017	$	25,000	$	1,052	1.8485	%	One-month L	Jan-04-2023
PNC Bank, N.A.	Jul-20-2017	Oct-30-2017	$	50,000	$	2,105	1.8475	%	One-month L	Jan-04-2023
The Toronto-Dominion Bank	Jul-24-2018	Jul-26-2019	$	50,000	$	111	2.9180	%	One-month L	Jan-12-2024
PNC Bank, N.A.	Jul-24-2018	Jul-26-2019	$	50,000	$	106	2.9190	%	One-month L	Jan-12-2024
Bank of Montreal	Jul-24-2018	Jul-26-2019	$	50,000	$	113	2.9190	%	One-month L	Jan-12-2024
U.S. Bank, N.A.	Jul-24-2018	Jul-26-2019	$	25,000	$	57	2.9190	%	One-month L	Jan-12-2024

The fair value of the interest rate swaps outstanding as of September 30, 2018 and December 31, 2017 was as follows.

Balance Sheet Line Item (in thousands)	Notional Amount September 30, 2018		Fair Value September 30, 2018		Notional Amount December 31, 2017		Fair Value December 31, 2017
Interest rate swaps-Asset	$	900,000	$	17,649	$	475,000	$	6,079
Interest rate swaps-Liability	$	—	$	—	$	250,000	$	(1,217	)

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 and subsequently reclassified into interest expense in the same periods during which the hedged transaction affects earnings.

Amounts reported in accumulated other comprehensive income 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 $5.1 million will be reclassified from accumulated other comprehensive income as a decrease to interest expense over the next 12 months.

The table below presents the effect of cash flow hedge accounting and the location in the consolidated financial statements for the three and nine months ended September 30, 2018 and 2017.

	Three months ended September 30,					Nine months ended September 30,
Effect of Cash Flow Hedge Accounting (in thousands)	2018		2017			2018		2017
Income (loss) recognized in accumulated other comprehensive income on interest rate swaps	$	2,572	$	316		$	13,349	$	(1,126	)
Income (loss) reclassified from accumulated other comprehensive income into income (loss) as interest expense	$	512	$	(282	)	$	538	$	(1,426	)
Total interest expense presented in the Consolidated Statements of Operations in which the effects of cash flow hedges are recorded	$	12,698	$	10,446		$	35,602	$	31,557

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, 2018, the Company had no derivatives that were in a net liability position by counterparty.

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, 2018 and December 31, 2017, 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 sets forth the Company’s financial instruments that are accounted for at fair value on a recurring basis as of September 30, 2018 and December 31, 2017. 

			Fair Value Measurements as of September 30, 2018 Using
Balance Sheet Line Item (in thousands)	Fair Value September 30, 2018		Level 1		Level 2		Level 3
Interest rate swaps-Asset	$	17,649	$	—	$	17,649	$	—
Interest rate swaps-Liability	$	—	$	—	$	—	$	—

				Fair Value Measurements as of December 31, 2017 Using
Balance Sheet Line Item (in thousands)	Fair Value December 31, 2017			Level 1		Level 2			Level 3
Interest rate swaps-Asset	$	6,079		$	—	$	6,079		$	—
Interest rate swaps-Liability	$	(1,217	)	$	—	$	(1,217	)	$	—

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Equity

9 Months Ended

Sep. 30, 2018

Stockholders' Equity Note [Abstract]

Equity

Equity

Preferred Stock

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”). The Company recognized a deemed dividend to the holders of the Series B Preferred Stock of approximately $2.7 million on the accompanying Consolidated Statements of Operations for the nine months ended September 30, 2018 related to redemption costs and the original issuance costs of the Series B Preferred Stock. On July 11, 2018, the Company redeemed all of the Series B Preferred Stock.

The table below sets forth the Company’s outstanding preferred stock issuances as of September 30, 2018.

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 tables below set forth the dividends attributable to the Company's outstanding preferred stock issuances during the nine months ended September 30, 2018 and the year ended December 31, 2017.

Quarter Ended 2018	Declaration Date	Series B Preferred Stock Per Share			Series C Preferred Stock Per Share		Payment Date
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		$	1.2890625

(1) On June 11, 2018, the Company gave notice to redeem all 2,800,000 issued and outstanding shares of the 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.

Quarter Ended 2017	Declaration Date	Series B Preferred Stock Per Share		Series C Preferred Stock Per Share		Payment Date
December 31	November 2, 2017	$	0.4140625	$	0.4296875	December 29, 2017
September 30	July 31, 2017	0.4140625		0.4296875		September 29, 2017
June 30	May 1, 2017	0.4140625		0.4296875		June 30, 2017
March 31	February 15, 2017	0.4140625		0.4296875		March 31, 2017
Total		$	1.6562500	$	1.7187500

On October 10, 2018, the Company’s board of directors declared the Series C Preferred Stock dividends for the quarter ending December 31, 2018 at a quarterly rate of $0.4296875 per share.

Common Stock

The following table sets forth the terms of the Company’s at-the market (“ATM”) common stock offering program as of September 30, 2018.

ATM Common Stock Offering Program	Date	Maximum Aggregate Offering Price (in thousands)		Aggregate Common Stock Available as of September 30, 2018 (in thousands)
2017 $500 million ATM	November 13, 2017	$	500,000	$	213,217

The table below set forth the activity under the ATM common stock offering programs during the nine months ended September 30, 2018 and year ended December 31, 2017 (in thousands, except share data).

	Nine months ended September 30, 2018
ATM Common Stock Offering Program	Shares Sold	Weighted Average Price Per Share		Gross Proceeds		Sales Agents’ Fee		Net Proceeds
2017 $500 million ATM	10,387,962	$	26.61	$	276,457	$	2,888	$	273,569
Total/weighted average	10,387,962	$	26.61	$	276,457	$	2,888	$	273,569

	Year ended December 31, 2017
ATM Common Stock Offering Program	Shares Sold	Weighted Average Price Per Share		Gross Proceeds		Sales Agents’ Fee		Net Proceeds
2017 $500 million ATM	363,843	$	28.38	$	10,326	$	129	$	10,197
2017 $300 million ATM(1)	11,098,748	$	27.03	300,000		3,637		296,363
2016 $228 million ATM(1)	4,799,784	$	24.42	117,216		1,604		115,612
Total/weighted average	16,262,375	$	26.29	$	427,542	$	5,370	$	422,172

(1) These programs ended before December 31, 2017.

The table below sets forth the dividends attributable to the Company's outstanding shares of common stock that were declared during the nine months ended September 30, 2018 and the year ended December 31, 2017.

Month Ended 2018	Declaration Date	Record Date	Per Share		Payment Date
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			$	1.064997

Month Ended 2017	Declaration Date	Record Date	Per Share		Payment Date
December 31	July 31, 2017	December 29, 2017	$	0.117500	January 16, 2018
November 30	July 31, 2017	November 30, 2017	0.117500		December 15, 2017
October 31	July 31, 2017	October 31, 2017	0.117500		November 15, 2017
September 30	May 1, 2017	September 29, 2017	0.117500		October 16, 2017
August 31	May 1, 2017	August 31, 2017	0.117500		September 15, 2017
July 31	May 1, 2017	July 31, 2017	0.117500		August 15, 2017
June 30	February 15, 2017	June 30, 2017	0.116667		July 17, 2017
May 31	February 15, 2017	May 31, 2017	0.116667		June 15, 2017
April 30	February 15, 2017	April 28, 2017	0.116667		May 15, 2017
March 31	November 2, 2016	March 31, 2017	0.116667		April 17, 2017
February 28	November 2, 2016	February 28, 2017	0.116667		March 15, 2017
January 31	November 2, 2016	January 31, 2017	0.116667		February 15, 2017
Total			$	1.405002

On October 10, 2018, the Company’s board of directors declared the common stock dividends for the months ending October 31, 2018, November 30, 2018 and December 31, 2018 at a monthly rate of $0.118333 per share of common stock.

Restricted Stock-Based Compensation

Restricted shares of common stock granted on January 5, 2018 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 2019. The following table summarizes activity related to the Company’s unvested restricted shares of common stock for the nine months ended September 30, 2018 and the year ended December 31, 2017.

Unvested Restricted Shares of Common Stock	Shares
Balance at December 31, 2016	272,337
Granted	75,001		(1)
Vested	(109,209	)	(2)
Forfeited	(922	)
Balance at December 31, 2017	237,207
Granted	76,659		(1)
Vested	(112,405	)	(2)
Forfeited	(10,630	)
Balance at September 30, 2018	190,831

(1) The fair value per share on the grant date of January 5, 2018 and January 6, 2017 was $26.40 and $24.41, respectively.

(2) The Company repurchased and retired 41,975 and 40,836 restricted shares of common stock that vested during the nine months ended September 30, 2018 and the year ended December 31, 2017, respectively.

The unrecognized compensation expense associated with the Company’s restricted shares of common stock at September 30, 2018 was approximately $3.1 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, 2018 and 2017. 

	Three months ended September 30,				Nine months ended September 30,
	2018		2017		2018		2017
Vested restricted shares of common stock	—		—		112,405		109,209
Fair value of vested restricted shares of common stock (in thousands)	$	—	$	—	$	3,002	$	2,591

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Noncontrolling Interest

9 Months Ended

Sep. 30, 2018

Noncontrolling Interest [Abstract]

Noncontrolling Interest

Noncontrolling Interest

The table below summarizes the activity for noncontrolling interest in the Company for the nine months ended September 30, 2018 and the year ended December 31, 2017.

	LTIP Units		Other Common Units		Total Noncontrolling Common Units		Noncontrolling Interest
Balance at December 31, 2016	1,576,516		2,057,365		3,633,881		4.3	%
Granted/Issued	126,239		687,827		814,066		N/A
Forfeited	—		—		—		N/A
Conversions from LTIP units to Other Common Units	(245,685	)	245,685		—		N/A
Redemptions from Other Common Units to common stock	—		(351,260	)	(351,260	)	N/A
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 September 30, 2018	1,616,200		2,453,234		4,069,434		3.6	%

LTIP Units

On March 12, 2018, the Company's board of directors appointed Michelle Dilley to serve as director of the Company. On March 12, 2018, Ms. Dilley was granted 3,930 LTIP units which, subject to Ms. Dilley's continued service, will vest on January 1, 2019.

LTIP units granted on January 5, 2018 to non-employee, independent directors, subject to the recipient’s continued service, will vest on January 1, 2019. LTIP units granted on January 5, 2018 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, 2018. Refer to Note 8 for a discussion of vested LTIP units granted on January 5, 2018 pursuant to the 2015 Outperformance Program (the “2015 OPP”).

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 table below sets forth the assumptions used in valuing such LTIP units granted during the nine months ended September 30, 2018 (excluding those vested LTIP units granted pursuant to the 2015 OPP; refer to Note 8 for details).

LTIP Units	Assumptions
Grant date	March 12, 2018			January 5, 2018
Expected term (years)	10			10
Expected volatility	22.0		%	22.0		%
Expected dividend yield	6.0		%	6.0		%
Risk-free interest rate	2.46		%	2.09		%
Fair value of LTIP units at issuance (in thousands)	$	90		$	3,447
LTIP units at issuance	3,930			137,616
Fair value unit price per LTIP unit at issuance	$	22.90		$	25.05

The following table summarizes activity related to the Company’s unvested LTIP units for the nine months ended September 30, 2018 and the year ended December 31, 2017.

Unvested LTIP Units	LTIP Units
Balance at December 31, 2016	403,423
Granted	126,239
Vested	(229,355	)
Forfeited	—
Balance at December 31, 2017	300,307
Granted	324,802
Vested	(342,940	)
Forfeited	—
Balance at September 30, 2018	282,169

The unrecognized compensation expense associated with the Company’s LTIP units at September 30, 2018 was approximately $5.7 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 LTIP units that vested during the three and nine months ended September 30, 2018 and 2017.

	Three months ended September 30,				Nine months ended September 30,
	2018		2017		2018		2017
Vested LTIP units	30,949		44,942		342,940		157,816
Fair value of vested LTIP units (in thousands)	$	851	$	1,235	$	9,002	$	4,146

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Equity Incentive Plan

9 Months Ended

Sep. 30, 2018

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

Equity Incentive Plan

Equity Incentive Plan

At the Company’s annual meeting of stockholders held on April 30, 2018, the Company’s stockholders approved an amendment and restatement of the 2011 Plan, under which the Company may issue equity-based awards, including stock options, stock appreciation rights, restricted stock, restricted stock units, unrestricted stock awards and other awards based on shares of the Company’s common stock, such as LTIP units, to executive officers, directors, employees and other individuals providing bona fide services to or for the Company or its affiliates. The amendment increased the total number of shares of common stock authorized and reserved for issuance under the 2011 Plan by 3,000,000 shares to an aggregate of 6,642,461 shares, subject to certain adjustments as described in the 2011 Plan. Awards previously granted under the 2011 Plan will remain in effect pursuant to their terms.  

On January 5, 2018, 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 5, 2018 are substantially the same as the terms of the performance units granted on January 6, 2017 and March 8, 2016, except that the measuring period commences on January 1, 2018 and ends on December 31, 2020.

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 into earnings ratably from the grant date over the respective vesting periods. The table below sets forth the assumptions used in valuing the performance units granted during the nine months ended September 30, 2018.

Performance Units	Assumptions
Grant date	January 5, 2018
Expected volatility	22.0		%
Expected dividend yield	6.0		%
Risk-free interest rate	2.09		%
Fair value of performance units grant (in thousands)	$	5,456

On January 1, 2018, the Company’s three year measurement period pursuant to the 2015 OPP concluded. It was determined that the Company's total stockholder return exceeded the threshold percentage and return hurdle and a pool of approximately $6.2 million was awarded to the participants. The compensation committee of the board of directors approved the issuance of 183,256 vested LTIP units and 53,722 vested shares of common stock (of which 15,183 shares of common stock were repurchased and retired) to the participants, all of which were issued on January 5, 2018.

The unrecognized compensation expense associated with the Company's performance units at September 30, 2018 was approximately $6.1 million and is expected to be recognized over a weighted average period of approximately 2.3 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, the 2015 OPP (performance units and the 2015 OPP, collectively the “Performance-based Compensation Plans”), and the Company’s director compensation for the three and nine months ended September 30, 2018 and 2017.

	Three months ended September 30,				Nine months ended September 30,
Non-Cash Compensation Expense (in thousands)	2018		2017		2018		2017
Restricted shares of common stock	$	406	$	594	$	1,269	$	1,776
LTIP units	893		1,167		2,654		3,508
Performance-based Compensation Plans	838		536		2,463		1,610
Director compensation (1)	99		87		285		265
Total non-cash compensation expense	$	2,236	$	2,384	$	6,671	$	7,159

(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, 2018 and 2017. 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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Earnings Per Share

9 Months Ended

Sep. 30, 2018

Earnings Per Share [Abstract]

Earnings Per Share

Earnings Per Share

During the three and nine months ended September 30, 2018 and 2017, there were 193,117, 196,871, 237,207 and 238,129, respectively, of unvested restricted shares of common stock on a weighted average basis that were considered participating securities.

The following table sets forth the computation of basic and diluted earnings per common share for the three and nine months ended September 30, 2018 and 2017.

	Three months ended September 30,				Nine months ended September 30,
Earnings Per Share (in thousands, except per share data)	2018		2017		2018		2017
Numerator
Net income	$	8,876	$	21,839	$	48,989	$	23,276
Less: preferred stock dividends	1,289		2,449		6,315		7,345
Less: redemption of preferred stock	—		—		2,661		—
Less: amount allocated to participating securities	69		84		209		250
Less: income attributable to noncontrolling interest after preferred stock dividends	281		828		1,589		673
Net income attributable to common stockholders	$	7,237	$	18,478	$	38,215	$	15,008
Denominator
Weighted average common shares outstanding — basic	105,783		92,787		101,095		87,632
Effect of dilutive securities(1)
Share-based compensation	550		648		400		606
Weighted average common shares outstanding — diluted	106,333		93,435		101,495		88,238
Net income per share — basic and diluted
Net income per share attributable to common stockholders — basic	$	0.07	$	0.20	$	0.38	$	0.17
Net income per share attributable to common stockholders — diluted	$	0.07	$	0.20	$	0.38	$	0.17

(1) During the three and nine months ended September 30, 2018 and 2017, there were approximately 193, 197, 237 and 238, respectively, unvested restricted shares of common stock on a weighted average basis that were not included in the computation of diluted earnings per share because to do so would have been antidilutive for the period.

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Commitments and Contingencies

9 Months Ended

Sep. 30, 2018

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 $5.6 million as of September 30, 2018 related to construction projects and certain other agreements.

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Subsequent Events

9 Months Ended

Sep. 30, 2018

Subsequent Events [Abstract]

Subsequent Events

Subsequent Events

There were no recognized or non-recognized subsequent events.

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Summary of Significant Accounting Policies (Policies)

9 Months Ended

Sep. 30, 2018

Accounting Policies [Abstract]

Revenue Recognition, Real Estate Transactions, Policy [Policy Text Block]

Gain on the Sales of Rental Property, net

The timing of the derecognition of a rental property and the corresponding recognition of gain on the sales of rental property, net is measured by various criteria related to the terms of the sale transaction, and if the Company has lost control of the property and the acquirer has gained control of the property after the transaction. If the derecognition criteria is met, the full gain is recognized.

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, 2017.

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 (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.

Reclassification

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

New Accounting Pronouncements

New Accounting Standards Adopted

In August 2017, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) 2017-12, Derivatives and Hedging (Topic 815):Targeted Improvements to Accounting for Hedging Activities. The purpose of this updated guidance is to better align a company’s financial reporting for hedging activities with the economic objectives of those activities. This standard is effective for fiscal years beginning after December 15, 2018 and interim periods within those years, with early adoption permitted, and the Company adopted this standard effective January 1, 2018 using the modified retrospective transition method. The adoption of this standard resulted in a cumulative effect adjustment of approximately $0.3 million recorded as an increase to cumulative dividends in excess of earnings and an increase to accumulated other comprehensive income as of January 1, 2018 in the accompanying Consolidated Statements of Equity.

In May 2017, the FASB issued ASU 2017-09, Stock Compensation (Topic 718): Scope of Modification Accounting, which provides updated guidance about which changes to the terms or conditions of a share-based payment award would require an entity to apply modification accounting under the topic. This standard is effective for fiscal years beginning after December 15, 2017 and interim periods within those years, and the Company adopted this standard prospectively effective January 1, 2018. The adoption of this standard did not have a material effect on the Company's consolidated financial statements.

In February 2017, the FASB issued ASU 2017-05, Other Income - Gains and Losses from the Derecognition of Nonfinancial Assets (Subtopic 610-20): Clarifying the Scope of Asset Derecognition Guidance and Accounting for Partial Sales of Nonfinancial Assets, which provides guidance for recognizing gains and losses from the transfer of nonfinancial assets in contracts with non-customers. The new standard was issued as part of the new revenue standard (ASU 2014-09, as discussed below), and defines “in substance nonfinancial asset,” unifies guidance related to partial sales of nonfinancial assets, eliminates rules specifically addressing sales of real estate, removes exceptions to the financial asset derecognition model, and clarifies the accounting for contributions of nonfinancial assets to joint ventures. As a result of the new guidance, the guidance specific to real estate sales in Subtopic 360-20 was eliminated, and sales and partial sales of real estate assets will now be subject to the same derecognition model as all other nonfinancial assets. This standard is effective at the same time an entity adopts ASU 2014-09, which the Company adopted effective January 1, 2018. The Company adopted this standard effective January 1, 2018 using the modified retrospective approach. The adoption of this standard did not have a material effect on the Company's consolidated financial statements.

In January 2017, the FASB issued ASU 2017-01, Business Combinations (Topic 805): Clarifying the Definition of a Business. The new standard provides a screen to determine when a set of assets and activities is not a business. The screen requires that when substantially all of the fair value of the gross assets acquired or disposed of is concentrated in a single identifiable asset or a group of similar identifiable assets, the set is not a business. This standard is effective for annual periods beginning after December 15, 2017 and interim periods within those periods, and the Company adopted this standard prospectively effective January 1, 2018. As a result, it is expected that the majority of the Company's acquisitions will be accounted for as asset acquisitions, whereas under the former guidance the majority of the Company's acquisitions had been accounted for as business combinations. The most significant difference between the two accounting models that impacts the Company's consolidated financial statements is that in an asset acquisition, property acquisition costs are generally a component of the consideration transferred to acquire a group of assets and are capitalized as a component of the cost of the assets, whereas in a business combination, property acquisition costs are expensed and not included as part of the consideration transferred.

In November 2016, the FASB issued ASU 2016-18, Statement of Cash Flows (Topic 230): Restricted Cash.The new standard requires that the statement of cash flows explain the changes during the period in the total of cash, cash equivalents, and amounts generally described as restricted cash or restricted cash equivalents. This standard is effective for fiscal years beginning after December 15, 2017 and the Company adopted this standard effective January 1, 2018. As a result, the Company has included restricted cash with cash and cash equivalents when reconciling the beginning and end of period total amounts on the accompanying Consolidated Statements of Cash Flows. The effects of this standard were applied retrospectively to all prior periods presented. For the nine months ended September 30, 2017, the effect of the change in accounting principle was a decrease in cash provided by operating activities of approximately $0.5 million and an increase in cash used in investing activities of approximately $5.6 million on the accompanying Consolidated Statements of Cash Flows.

In January 2016, the FASB issued ASU 2016-01, Recognition and Measurement of Financial Assets and Financial Liabilities (Subtopic 825-10). The amendments in ASU 2016-01 address certain aspects of recognition, measurement, presentation, and disclosure of financial instruments. The standard primarily affects the accounting for equity investments, financial liabilities under the fair value option, and the presentation and disclosure requirements for financial instruments. ASU 2016-01 is effective for the annual periods beginning after December 31, 2017 and for annual periods and interim periods within those years, and the Company adopted this standard prospectively effective January 1, 2018. The adoption of this standard did not have a material effect on the Company's consolidated financial statements.

In May 2014, the FASB issued ASU 2014-09, Revenue from Contracts with Customers(Topic 606). ASU 2014-09 is a comprehensive new revenue recognition model requiring a company to recognize revenue to depict the transfer of goods or services to a customer at an amount reflecting the consideration it expects to receive in exchange for those goods or services. Additionally, the new revenue guidance requires improved disclosures regarding the nature, amount, timing and uncertainty of revenue and cash flows arising from contracts with customers. The Company adopted this standard effective January 1, 2018 using the modified retrospective approach. The adoption of this standard did not have a material effect on the Company's consolidated financial statements.

New Accounting Standards Issued but not yet Adopted

In February 2016, the FASB issued ASU 2016-02, Leases (Topic 842), and various subsequent ASU’s, which sets 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 supersedes 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 will determine 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 will be accounted for similar to existing guidance for operating leases today. The new standard requires lessors to account for leases using an approach that is substantially equivalent to existing guidance for sales-type leases, direct financing leases and operating leases. ASU 2016-02 is expected to impact the Company’s consolidated financial statements as the Company has certain operating and land lease arrangements for which it is the lessee, which will result in the recording of a right of use asset and the related lease liability. The standard is effective for fiscal years beginning after December 15, 2018, including interim periods within those fiscal years, with early adoption permitted. The new standard must be adopted using the modified retrospective transition method by recognizing a cumulative effect adjustment to the opening balance of cumulative dividends in excess of earnings, by either applying the new guidance at the beginning of the earliest comparative period or by applying the new guidance at the adoption date. The Company intends to adopt available practical expedients which allows the Company to 1) not reassess whether any expired or existing contracts are or contain leases; 2) not reassess the lease classification for any expired or existing leases; and 3) not reassess initial direct costs for any existing leases. The Company is currently in the process of evaluating the impact the adoption of ASU 2016-02 will have on the Company’s financial position or results of operations, and plans to adopt this standard effective January 1, 2019.

In May 2014, the FASB issued ASU 2014-09, Revenue from Contracts with Customers(Topic 606), which the Company adopted on January 1, 2018, as discussedin “New Accounting Standards Adopted” above. While lease contracts with customers, which constitute a vast majority of the Company’s revenues, are specifically excluded from the model’s scope, once the new leases standard under ASU 2016-02 is adopted by the Company, the new revenue standard may apply to executory costs and other components of revenue due under leases that are deemed to be non-lease components (such as common area maintenance and provision of utilities), even when the revenue for such activities is not separately stipulated in the lease. In that case, revenue from these items previously recognized on a straight-line basis under current lease guidance would be recognized under the new revenue guidance as the related services are delivered. As a result, while the total revenue recognized over time would not differ under the new guidance, the recognition pattern may be different. In July 2018, the FASB issued 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. Otherwise, the company should account for the combined component as an operating lease in accordance with Topic 842. The Company is currently in the process of evaluating the impact the adoption of ASU 2016-02 will have on the Company’s financial position or results of operations, and plans to adopt this standard effective January 1, 2019.

Restricted cash and cash equivalents, policy

Restricted Cash

Restricted cash may include tenant security deposits and cash held in escrow for real estate taxes and capital improvements as required in various mortgage note agreements. Restricted cash also may include amounts held by the Company’s transfer agent for preferred stock dividends that are distributed subsequent to period end.

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

9 Months Ended

Sep. 30, 2018

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, 2018		December 31, 2017
Cash and cash equivalents	$	6,024	$	24,562
Restricted cash	5,231		3,567
Total cash and cash equivalents and restricted cash	$	11,255	$	28,129

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Rental Property (Tables)

9 Months Ended

Sep. 30, 2018

Real Estate [Abstract]

Schedule of components of rental property

The following table summarizes the components of rental property as of September 30, 2018 and December 31, 2017.

Rental Property (in thousands)	September 30, 2018		December 31, 2017
Land	$	355,590	$	321,560
Buildings, net of accumulated depreciation of $190,538 and $160,281, respectively	2,006,013		1,756,579
Tenant improvements, net of accumulated depreciation of $35,495 and $32,714, respectively	30,577		30,138
Building and land improvements, net of accumulated depreciation of $75,754 and $56,062, respectively	160,496		143,170
Construction in progress	5,669		2,877
Deferred leasing intangibles, net of accumulated amortization of $237,892 and $280,642, respectively	327,734		313,253
Total rental property, net	$	2,886,079	$	2,567,577

Schedule of real estate properties acquired

The following table summarizes the acquisitions of the Company during the three and nine months ended September 30, 2018.

Market (1)	Date Acquired	Square Feet	Buildings	Purchase Price (in thousands)
Greenville/Spartanburg, SC	January 11, 2018	203,000	1	$	10,755
Minneapolis/St Paul, MN	January 26, 2018	145,351	1	13,538
Philadelphia, PA	February 1, 2018	278,582	1	18,277
Houston, TX	February 22, 2018	242,225	2	22,478
Greenville/Spartanburg, SC	March 30, 2018	222,710	1	13,773
Three months ended March 31, 2018		1,091,868	6	78,821
Chicago, IL	April 23, 2018	169,311	2	10,975
Milwaukee/Madison, WI	April 26, 2018	53,680	1	4,316
Pittsburgh, PA	April 30, 2018	175,000	1	15,380
Detroit, MI	May 9, 2018	274,500	1	19,328
Minneapolis/St Paul, MN	May 15, 2018	509,910	2	26,983
Cincinnati/Dayton, OH	May 23, 2018	158,500	1	7,317
Baton Rouge, LA	May 31, 2018	279,236	1	21,379
Las Vegas, NV	June 12, 2018	122,472	1	17,920
Greenville/Spartanburg, SC	June 15, 2018	131,805	1	5,621
Denver, CO	June 18, 2018	64,750	1	7,044
Cincinnati/Dayton, OH	June 25, 2018	465,136	1	16,421
Charlotte, NC	June 29, 2018	69,200	1	5,446
Houston, TX	June 29, 2018	252,662	1	27,170
Three months ended June 30, 2018		2,726,162	15	185,300
Knoxville, TN	July 10, 2018	106,000	1	6,477
Pittsburgh, PA	August 2, 2018	265,568	1	19,186
Raleigh/Durham, NC	August 2, 2018	365,000	1	21,067
Detroit, MI	August 6, 2018	439,150	1	21,077
Des Moines, IA	August 8, 2018	121,922	1	6,053
McAllen/Edinburg/Pharr, TX	August 9, 2018	270,084	1	18,523
Pittsburgh, PA	August 15, 2018	200,500	1	11,327
Minneapolis/St Paul, MN	August 24, 2018	120,606	1	8,422
Milwaukee/Madison, WI	September 28, 2018	100,800	1	7,484
Milwaukee/Madison, WI	September 28, 2018	174,633	2	13,288
Chicago, IL	September 28, 2018	105,637	1	6,368
Indianapolis, IN	September 28, 2018	478,721	1	29,085
Augusta/Richmond County, GA	September 28, 2018	203,726	1	9,379
Charlotte, NC	September 28, 2018	301,000	1	16,807
Three months ended September 30, 2018		3,253,347	15	194,543
Nine months ended September 30, 2018		7,071,377	36	$	458,664

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, 2018 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	$	39,340		N/A
Buildings	317,293			N/A
Tenant improvements	4,849			N/A
Building and land improvements	21,731			N/A
Deferred leasing intangibles - In-place leases	52,276			8.7
Deferred leasing intangibles - Tenant relationships	21,861			11.8
Deferred leasing intangibles - Above market leases	4,062			8.2
Deferred leasing intangibles - Below market leases	(3,122		)	6.7
Deferred leasing intangibles - Above market ground leases	(178		)	48.1
Other assets	794			N/A
Other liabilities	(242		)	N/A
Total purchase price	$	458,664

Schedule of pro forma information for acquired properties

The table below sets forth the results of operations for the three and nine months ended September 30, 2018 for the buildings acquired during the nine months ended September 30, 2018 included in the Company’s Consolidated Statements of Operations from the date of acquisition.

Results of Operations (in thousands)	Three months ended September 30, 2018		Nine months ended September 30, 2018
Total revenue	$	7,122	$	11,156
Net income	$	1,556	$	1,642

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

The following table summarizes the Company's loss on impairments for assets held and used during the nine months ended September 30, 2018.

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)
Buena Vista, VA(4)	1	Change in estimated hold period	(5)	Discounted cash flows	(6)
Sergeant Bluff, IA(4)	1	Change in estimated hold period	(5)	Discounted cash flows	(6)
Three months ended March 31, 2018						$	3,176	$	2,934
Nine months ended September 30, 2018						$	3,176	$	2,934

(1) As defined by CoStar Realty Information Inc.

(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 assets held and used 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) These buildings do not have markets as defined by CoStar Realty Information Inc.

(5) This property was sold during the nine months ended September 30, 2018.

(6) Level 3 inputs used to determine fair value for the impaired assets held and used for the three months ended March 31, 2018: discount rates ranged from 11.0% to 14.5% and exit capitalization rates ranged from 11.0% to 13.0%.

Schedule of Finite-Lived Intangible Assets and Below Market Leases

The following table sets forth the deferred leasing intangibles on the accompanying Consolidated Balance Sheets as of September 30, 2018 and December 31, 2017.

	September 30, 2018							December 31, 2017
Deferred Leasing Intangibles (in thousands)	Gross		Accumulated Amortization			Net		Gross		Accumulated Amortization			Net
Above market leases	$	70,454	$	(31,663	)	$	38,791	$	78,558	$	(36,810	)	$	41,748
Other intangible lease assets	495,172		(206,229		)	288,943		515,337		(243,832		)	271,505
Total deferred leasing intangible assets	$	565,626	$	(237,892	)	$	327,734	$	593,895	$	(280,642	)	$	313,253
Below market leases	$	33,751	$	(13,043	)	$	20,708	$	34,776	$	(13,555	)	$	21,221
Total deferred leasing intangible liabilities	$	33,751	$	(13,043	)	$	20,708	$	34,776	$	(13,555	)	$	21,221

The following table sets forth 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, 2018 and 2017.

	Three months ended September 30,				Nine months ended September 30,
Deferred Leasing Intangibles Amortization (in thousands)	2018		2017		2018		2017
Net decrease to rental income related to above and below market lease amortization	$	1,150	$	1,318	$	3,206	$	3,873
Amortization expense related to other intangible lease assets	$	20,361	$	17,934	$	56,698	$	53,747

Schedule of Finite-Lived Intangible Assets, Future Amortization Expense

The following table sets forth the amortization of deferred leasing intangibles over the next five calendar years beginning with 2018 as of September 30, 2018.

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 2018	$	17,263	$	927
2019	$	57,841	$	3,926
2020	$	47,750	$	3,546
2021	$	37,229	$	2,163
2022	$	29,690	$	1,154

Below Market Lease, Future Amortization Income

The following table sets forth the amortization of deferred leasing intangibles over the next five calendar years beginning with 2018 as of September 30, 2018.

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 2018	$	17,263	$	927
2019	$	57,841	$	3,926
2020	$	47,750	$	3,546
2021	$	37,229	$	2,163
2022	$	29,690	$	1,154

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Debt (Tables)

9 Months Ended

Sep. 30, 2018

Debt Disclosure [Abstract]

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

The following table sets forth a summary of 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, 2018 and December 31, 2017.

Loan	Principal Outstanding as of September 30, 2018 (in thousands)			Principal Outstanding as of December 31, 2017 (in thousands)			Interest  Rate (1)		Maturity Date	Prepayment Terms (2)
Unsecured credit facility:
Unsecured Credit Facility (3)	$	95,000		$	271,000		L + 1.05%		Jan-15-2023	i
Total unsecured credit facility	95,000			271,000
Unsecured term loans:
Unsecured Term Loan C	150,000			150,000			L + 1.30%		Sep-29-2020	i
Unsecured Term Loan B	150,000			150,000			L + 1.30%		Mar-21-2021	i
Unsecured Term Loan A	150,000			150,000			L + 1.30%		Mar-31-2022	i
Unsecured Term Loan D	150,000			—			L + 1.30%		Jan-04-2023	i
Unsecured Term Loan E (4)	—			—			L + 1.20%		Jan-15-2024	i
Total unsecured term loans	600,000			450,000
Less: Total unamortized deferred financing fees and debt issuance costs	(3,915		)	(3,735		)
Total carrying value unsecured term loans, net	596,085			446,265
Unsecured notes:
Series F Unsecured Notes	100,000			100,000			3.98	%	Jan-05-2023	ii
Series A Unsecured Notes	50,000			50,000			4.98	%	Oct-1-2024	ii
Series D Unsecured Notes	100,000			100,000			4.32	%	Feb-20-2025	ii
Series G Unsecured Notes	75,000			—			4.10	%	Jun-13-2025	ii
Series B Unsecured Notes	50,000			50,000			4.98	%	Jul-1-2026	ii
Series C Unsecured Notes	80,000			80,000			4.42	%	Dec-30-2026	ii
Series E Unsecured Notes	20,000			20,000			4.42	%	Feb-20-2027	ii
Series H Unsecured Notes	100,000			—			4.27	%	Jun-13-2028	ii
Total unsecured notes	575,000			400,000
Less: Total unamortized deferred financing fees and debt issuance costs	(2,611		)	(1,766		)
Total carrying value unsecured notes, net	572,389			398,234
Mortgage notes (secured debt):
Wells Fargo Bank, National Association CMBS Loan	53,652			54,949			4.31	%	Dec-1-2022	iii
Thrivent Financial for Lutherans	3,824			3,906			4.78	%	Dec-15-2023	iv
Total mortgage notes	57,476			58,855
Add: Total unamortized fair market value premiums	52			61
Less: Total unamortized deferred financing fees and debt issuance costs	(535		)	(634		)
Total carrying value mortgage notes, net	56,993			58,282
Total / weighted average interest rate (5)	$	1,320,467		$	1,173,781		3.69	%

(1) Interest rate as of September 30, 2018. At September 30, 2018, the one-month LIBOR (“L”) was 2.26056%. The 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 consolidated leverage ratio, as defined in the respective loan agreements.

(2) 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 beginning January 1, 2016; and (iv) pre-payable without penalty three months prior to the maturity date.

(3) 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 $3.4 million and $1.5 million is included in prepaid expenses and other assets on the accompanying Consolidated Balance Sheets as of September 30, 2018 and December 31, 2017, respectively.

(4) Capacity of $175.0 million, which the Company has until July 25, 2019 to draw.

(5) The weighted average interest rate was calculated using the fixed interest rate swapped on the notional amount of $600.0 million of debt that was in effect as of September 30, 2018, 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 table below sets forth 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, 2018 and 2017.

	Three months ended September 30,				Nine months ended September 30,
Costs Included in Interest Expense (in thousands)	2018		2017		2018		2017
Amortization of deferred financing fees and debt issuance costs and fair market value premiums	$	617	$	546	$	1,698	$	1,553
Facility fees and unused fees	$	275	$	286	$	928	$	839

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

The following table presents the aggregate principal outstanding under the Company’s debt arrangements and the corresponding estimate of fair value as of September 30, 2018 and December 31, 2017 (in thousands).

	September 30, 2018					December 31, 2017
	Principal Outstanding			Fair Value		Principal Outstanding			Fair Value
Unsecured credit facility	$	95,000		$	95,000	$	271,000		$	271,528
Unsecured term loans	600,000			607,663		450,000			451,463
Unsecured notes	575,000			569,493		400,000			415,599
Mortgage notes	57,476			57,608		58,855			59,769
Total principal amount	1,327,476			$	1,329,764	1,179,855			$	1,198,359
Add: Total unamortized fair market value premiums	52					61
Less: Total unamortized deferred financing fees and debt issuance costs	(7,061		)			(6,135		)
Total carrying value	$	1,320,467				$	1,173,781

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Use of Derivative Financial Instruments (Tables)

9 Months Ended

Sep. 30, 2018

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Schedule of Derivative Instruments [Table Text Block]

The following table details the Company’s outstanding interest rate swaps as of September 30, 2018. 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	$	471	1.3300	%	One-month L	Feb-14-2020
Capital One, N.A.	Jun-13-2013	Jul-01-2013	$	50,000	$	703	1.6810	%	One-month L	Feb-14-2020
Capital One, N.A.	Jun-13-2013	Aug-01-2013	$	25,000	$	344	1.7030	%	One-month L	Feb-14-2020
Regions Bank	Sep-30-2013	Feb-03-2014	$	25,000	$	245	1.9925	%	One-month L	Feb-14-2020
The Toronto-Dominion Bank	Oct-14-2015	Sep-29-2016	$	25,000	$	700	1.3830	%	One-month L	Sep-29-2020
PNC Bank, N.A.	Oct-14-2015	Sep-29-2016	$	50,000	$	1,391	1.3906	%	One-month L	Sep-29-2020
Regions Bank	Oct-14-2015	Sep-29-2016	$	35,000	$	978	1.3858	%	One-month L	Sep-29-2020
U.S. Bank, N.A.	Oct-14-2015	Sep-29-2016	$	25,000	$	695	1.3950	%	One-month L	Sep-29-2020
Capital One, N.A.	Oct-14-2015	Sep-29-2016	$	15,000	$	417	1.3950	%	One-month L	Sep-29-2020
Royal Bank of Canada	Jan-08-2015	Mar-20-2015	$	25,000	$	684	1.7090	%	One-month L	Mar-21-2021
The Toronto-Dominion Bank	Jan-08-2015	Mar-20-2015	$	25,000	$	682	1.7105	%	One-month L	Mar-21-2021
The Toronto-Dominion Bank	Jan-08-2015	Sep-10-2017	$	100,000	$	1,488	2.2255	%	One-month L	Mar-21-2021
Wells Fargo, N.A.	Jan-08-2015	Mar-20-2015	$	25,000	$	886	1.8280	%	One-month L	Mar-31-2022
The Toronto-Dominion Bank	Jan-08-2015	Feb-14-2020	$	25,000	$	271	2.4535	%	One-month L	Mar-31-2022
Regions Bank	Jan-08-2015	Feb-14-2020	$	50,000	$	520	2.4750	%	One-month L	Mar-31-2022
Capital One, N.A.	Jan-08-2015	Feb-14-2020	$	50,000	$	467	2.5300	%	One-month L	Mar-31-2022
The Toronto-Dominion Bank	Jul-20-2017	Oct-30-2017	$	25,000	$	1,054	1.8485	%	One-month L	Jan-04-2023
Royal Bank of Canada	Jul-20-2017	Oct-30-2017	$	25,000	$	1,054	1.8505	%	One-month L	Jan-04-2023
Wells Fargo, N.A.	Jul-20-2017	Oct-30-2017	$	25,000	$	1,055	1.8505	%	One-month L	Jan-04-2023
PNC Bank, N.A.	Jul-20-2017	Oct-30-2017	$	25,000	$	1,052	1.8485	%	One-month L	Jan-04-2023
PNC Bank, N.A.	Jul-20-2017	Oct-30-2017	$	50,000	$	2,105	1.8475	%	One-month L	Jan-04-2023
The Toronto-Dominion Bank	Jul-24-2018	Jul-26-2019	$	50,000	$	111	2.9180	%	One-month L	Jan-12-2024
PNC Bank, N.A.	Jul-24-2018	Jul-26-2019	$	50,000	$	106	2.9190	%	One-month L	Jan-12-2024
Bank of Montreal	Jul-24-2018	Jul-26-2019	$	50,000	$	113	2.9190	%	One-month L	Jan-12-2024
U.S. Bank, N.A.	Jul-24-2018	Jul-26-2019	$	25,000	$	57	2.9190	%	One-month L	Jan-12-2024

Schedule of interest rate swaps

The fair value of the interest rate swaps outstanding as of September 30, 2018 and December 31, 2017 was as follows.

Balance Sheet Line Item (in thousands)	Notional Amount September 30, 2018		Fair Value September 30, 2018		Notional Amount December 31, 2017		Fair Value December 31, 2017
Interest rate swaps-Asset	$	900,000	$	17,649	$	475,000	$	6,079
Interest rate swaps-Liability	$	—	$	—	$	250,000	$	(1,217	)

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

The table below presents the effect of cash flow hedge accounting and the location in the consolidated financial statements for the three and nine months ended September 30, 2018 and 2017.

	Three months ended September 30,					Nine months ended September 30,
Effect of Cash Flow Hedge Accounting (in thousands)	2018		2017			2018		2017
Income (loss) recognized in accumulated other comprehensive income on interest rate swaps	$	2,572	$	316		$	13,349	$	(1,126	)
Income (loss) reclassified from accumulated other comprehensive income into income (loss) as interest expense	$	512	$	(282	)	$	538	$	(1,426	)
Total interest expense presented in the Consolidated Statements of Operations in which the effects of cash flow hedges are recorded	$	12,698	$	10,446		$	35,602	$	31,557

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

The following sets forth the Company’s financial instruments that are accounted for at fair value on a recurring basis as of September 30, 2018 and December 31, 2017. 

			Fair Value Measurements as of September 30, 2018 Using
Balance Sheet Line Item (in thousands)	Fair Value September 30, 2018		Level 1		Level 2		Level 3
Interest rate swaps-Asset	$	17,649	$	—	$	17,649	$	—
Interest rate swaps-Liability	$	—	$	—	$	—	$	—

				Fair Value Measurements as of December 31, 2017 Using
Balance Sheet Line Item (in thousands)	Fair Value December 31, 2017			Level 1		Level 2			Level 3
Interest rate swaps-Asset	$	6,079		$	—	$	6,079		$	—
Interest rate swaps-Liability	$	(1,217	)	$	—	$	(1,217	)	$	—

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Equity (Tables)

9 Months Ended

Sep. 30, 2018

Stockholders' Equity Note [Abstract]

Schedule of Stock by Class

he table below sets forth the Company’s outstanding preferred stock issuances as of September 30, 2018.

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	%

Schedule of dividends

The tables below set forth the dividends attributable to the Company's outstanding preferred stock issuances during the nine months ended September 30, 2018 and the year ended December 31, 2017.

Quarter Ended 2018	Declaration Date	Series B Preferred Stock Per Share			Series C Preferred Stock Per Share		Payment Date
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		$	1.2890625

(1) On June 11, 2018, the Company gave notice to redeem all 2,800,000 issued and outstanding shares of the 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.

Quarter Ended 2017	Declaration Date	Series B Preferred Stock Per Share		Series C Preferred Stock Per Share		Payment Date
December 31	November 2, 2017	$	0.4140625	$	0.4296875	December 29, 2017
September 30	July 31, 2017	0.4140625		0.4296875		September 29, 2017
June 30	May 1, 2017	0.4140625		0.4296875		June 30, 2017
March 31	February 15, 2017	0.4140625		0.4296875		March 31, 2017
Total		$	1.6562500	$	1.7187500

On October 10, 2018, the Company’s board of directors declared the Series C Preferred Stock dividends for the quarter ending December 31, 2018 at a quarterly rate of $0.4296875 per share.

The table below sets forth the dividends attributable to the Company's outstanding shares of common stock that were declared during the nine months ended September 30, 2018 and the year ended December 31, 2017.

Month Ended 2018	Declaration Date	Record Date	Per Share		Payment Date
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			$	1.064997

Month Ended 2017	Declaration Date	Record Date	Per Share		Payment Date
December 31	July 31, 2017	December 29, 2017	$	0.117500	January 16, 2018
November 30	July 31, 2017	November 30, 2017	0.117500		December 15, 2017
October 31	July 31, 2017	October 31, 2017	0.117500		November 15, 2017
September 30	May 1, 2017	September 29, 2017	0.117500		October 16, 2017
August 31	May 1, 2017	August 31, 2017	0.117500		September 15, 2017
July 31	May 1, 2017	July 31, 2017	0.117500		August 15, 2017
June 30	February 15, 2017	June 30, 2017	0.116667		July 17, 2017
May 31	February 15, 2017	May 31, 2017	0.116667		June 15, 2017
April 30	February 15, 2017	April 28, 2017	0.116667		May 15, 2017
March 31	November 2, 2016	March 31, 2017	0.116667		April 17, 2017
February 28	November 2, 2016	February 28, 2017	0.116667		March 15, 2017
January 31	November 2, 2016	January 31, 2017	0.116667		February 15, 2017
Total			$	1.405002

On October 10, 2018, the Company’s board of directors declared the common stock dividends for the months ending October 31, 2018, November 30, 2018 and December 31, 2018 at a monthly rate of $0.118333 per share of common stock.

Schedule of stock sale activity

The following table sets forth the terms of the Company’s at-the market (“ATM”) common stock offering program as of September 30, 2018.

ATM Common Stock Offering Program	Date	Maximum Aggregate Offering Price (in thousands)		Aggregate Common Stock Available as of September 30, 2018 (in thousands)
2017 $500 million ATM	November 13, 2017	$	500,000	$	213,217

The table below set forth the activity under the ATM common stock offering programs during the nine months ended September 30, 2018 and year ended December 31, 2017 (in thousands, except share data).

	Nine months ended September 30, 2018
ATM Common Stock Offering Program	Shares Sold	Weighted Average Price Per Share		Gross Proceeds		Sales Agents’ Fee		Net Proceeds
2017 $500 million ATM	10,387,962	$	26.61	$	276,457	$	2,888	$	273,569
Total/weighted average	10,387,962	$	26.61	$	276,457	$	2,888	$	273,569

	Year ended December 31, 2017
ATM Common Stock Offering Program	Shares Sold	Weighted Average Price Per Share		Gross Proceeds		Sales Agents’ Fee		Net Proceeds
2017 $500 million ATM	363,843	$	28.38	$	10,326	$	129	$	10,197
2017 $300 million ATM(1)	11,098,748	$	27.03	300,000		3,637		296,363
2016 $228 million ATM(1)	4,799,784	$	24.42	117,216		1,604		115,612
Total/weighted average	16,262,375	$	26.29	$	427,542	$	5,370	$	422,172

(1) These programs ended before December 31, 2017.

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, 2018 and the year ended December 31, 2017.

Unvested Restricted Shares of Common Stock	Shares
Balance at December 31, 2016	272,337
Granted	75,001		(1)
Vested	(109,209	)	(2)
Forfeited	(922	)
Balance at December 31, 2017	237,207
Granted	76,659		(1)
Vested	(112,405	)	(2)
Forfeited	(10,630	)
Balance at September 30, 2018	190,831

(1) The fair value per share on the grant date of January 5, 2018 and January 6, 2017 was $26.40 and $24.41, respectively.

(2) The Company repurchased and retired 41,975 and 40,836 restricted shares of common stock that vested during the nine months ended September 30, 2018 and the year ended December 31, 2017, 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, 2018 and 2017. 

	Three months ended September 30,				Nine months ended September 30,
	2018		2017		2018		2017
Vested restricted shares of common stock	—		—		112,405		109,209
Fair value of vested restricted shares of common stock (in thousands)	$	—	$	—	$	3,002	$	2,591

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Noncontrolling Interest (Tables)

9 Months Ended

Sep. 30, 2018

Noncontrolling Interest [Abstract]

Noncontrolling interest activity

The table below summarizes the activity for noncontrolling interest in the Company for the nine months ended September 30, 2018 and the year ended December 31, 2017.

	LTIP Units		Other Common Units		Total Noncontrolling Common Units		Noncontrolling Interest
Balance at December 31, 2016	1,576,516		2,057,365		3,633,881		4.3	%
Granted/Issued	126,239		687,827		814,066		N/A
Forfeited	—		—		—		N/A
Conversions from LTIP units to Other Common Units	(245,685	)	245,685		—		N/A
Redemptions from Other Common Units to common stock	—		(351,260	)	(351,260	)	N/A
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 September 30, 2018	1,616,200		2,453,234		4,069,434		3.6	%

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

The table below sets forth the assumptions used in valuing such LTIP units granted during the nine months ended September 30, 2018 (excluding those vested LTIP units granted pursuant to the 2015 OPP; refer to Note 8 for details).

LTIP Units	Assumptions
Grant date	March 12, 2018			January 5, 2018
Expected term (years)	10			10
Expected volatility	22.0		%	22.0		%
Expected dividend yield	6.0		%	6.0		%
Risk-free interest rate	2.46		%	2.09		%
Fair value of LTIP units at issuance (in thousands)	$	90		$	3,447
LTIP units at issuance	3,930			137,616
Fair value unit price per LTIP unit at issuance	$	22.90		$	25.05

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, 2018 and the year ended December 31, 2017.

Unvested LTIP Units	LTIP Units
Balance at December 31, 2016	403,423
Granted	126,239
Vested	(229,355	)
Forfeited	—
Balance at December 31, 2017	300,307
Granted	324,802
Vested	(342,940	)
Forfeited	—
Balance at September 30, 2018	282,169

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, 2018 and 2017.

	Three months ended September 30,				Nine months ended September 30,
	2018		2017		2018		2017
Vested LTIP units	30,949		44,942		342,940		157,816
Fair value of vested LTIP units (in thousands)	$	851	$	1,235	$	9,002	$	4,146

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Equity Incentive Plan (Tables)

9 Months Ended

Sep. 30, 2018

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

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

The table below sets forth the assumptions used in valuing the performance units granted during the nine months ended September 30, 2018.

Performance Units	Assumptions
Grant date	January 5, 2018
Expected volatility	22.0		%
Expected dividend yield	6.0		%
Risk-free interest rate	2.09		%
Fair value of performance units grant (in thousands)	$	5,456

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, the 2015 OPP (performance units and the 2015 OPP, collectively the “Performance-based Compensation Plans”), and the Company’s director compensation for the three and nine months ended September 30, 2018 and 2017.

	Three months ended September 30,				Nine months ended September 30,
Non-Cash Compensation Expense (in thousands)	2018		2017		2018		2017
Restricted shares of common stock	$	406	$	594	$	1,269	$	1,776
LTIP units	893		1,167		2,654		3,508
Performance-based Compensation Plans	838		536		2,463		1,610
Director compensation (1)	99		87		285		265
Total non-cash compensation expense	$	2,236	$	2,384	$	6,671	$	7,159

(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, 2018 and 2017. 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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Earnings Per Share (Tables)

9 Months Ended

Sep. 30, 2018

Earnings Per Share [Abstract]

Schedule of computation of basic and diluted earnings per common share

The following table sets forth the computation of basic and diluted earnings per common share for the three and nine months ended September 30, 2018 and 2017.

	Three months ended September 30,				Nine months ended September 30,
Earnings Per Share (in thousands, except per share data)	2018		2017		2018		2017
Numerator
Net income	$	8,876	$	21,839	$	48,989	$	23,276
Less: preferred stock dividends	1,289		2,449		6,315		7,345
Less: redemption of preferred stock	—		—		2,661		—
Less: amount allocated to participating securities	69		84		209		250
Less: income attributable to noncontrolling interest after preferred stock dividends	281		828		1,589		673
Net income attributable to common stockholders	$	7,237	$	18,478	$	38,215	$	15,008
Denominator
Weighted average common shares outstanding — basic	105,783		92,787		101,095		87,632
Effect of dilutive securities(1)
Share-based compensation	550		648		400		606
Weighted average common shares outstanding — diluted	106,333		93,435		101,495		88,238
Net income per share — basic and diluted
Net income per share attributable to common stockholders — basic	$	0.07	$	0.20	$	0.38	$	0.17
Net income per share attributable to common stockholders — diluted	$	0.07	$	0.20	$	0.38	$	0.17

(1) During the three and nine months ended September 30, 2018 and 2017, there were approximately 193, 197, 237 and 238, respectively, unvested restricted shares of common stock on a weighted average basis that were not included in the computation of diluted earnings per share because to do so would have been antidilutive for the period.

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Organization and Description of Business (Details) ft² in Millions	9 Months Ended	12 Months Ended
	Sep. 30, 2018 ft² tenant state building	Dec. 31, 2017
Real Estate Properties [Line Items]
Ownership interest in Operating Partnership (as a percent)	96.40%	95.90%
Number of properties	381
Number of states in which the entity owned buildings | state	37
Area (in square feet) | ft²	75.4
Percentage of buildings leased to tenants	95.40%
Number of tenants | tenant	330
Warehouse - Distribution buildings
Real Estate Properties [Line Items]
Number of properties	313
Light Manufacturing buildings
Real Estate Properties [Line Items]
Number of properties	59
Flex/Office Buildings
Real Estate Properties [Line Items]
Number of properties	9

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Summary of Significant Accounting Policies - New Accounting Pronouncements (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Jan. 01, 2018	Dec. 31, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Increase to accumulated other comprehensive income (loss)	$ 16,485			$ 3,936
Increase in cash provided by operating activities	148,610	$ 120,034
Increase in cash used in investing activities	$ 393,250	468,294
Accounting Standards Update 2016-18 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Increase in cash provided by operating activities		500
Increase in cash used in investing activities		$ (5,600)
New Accounting Pronouncement, Early Adoption, Effect [Member] | Accounting Standards Update 2017-12 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Increase to accumulated other comprehensive income (loss)			$ 300
Decrease in accumulated distributions in excess of net income			$ (300)

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Summary of Significant Accounting Policies - Restricted Cash (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017	Sep. 30, 2017	Dec. 31, 2016
Accounting Policies [Abstract]
Cash and cash equivalents	$ 6,024	$ 24,562
Restricted cash	5,231	3,567
Cash and cash equivalents and restricted cash—end of period	$ 11,255	$ 28,129	$ 14,587	$ 21,805

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Summary of Significant Accounting Policies - Tenant Accounts Receivable (Details) - USD ($) $ in Millions	Sep. 30, 2018	Dec. 31, 2017
Tenant Accounts Receivable, net
Lease security deposits available in existing letters of credit	$ 14.6	$ 12.7
Lease security deposits in restricted cash	0.7	0.7
Lease security deposits included in tenant prepaid rent and security deposits on the Balance Sheet	8.7	8.1
Trade Accounts Receivable
Tenant Accounts Receivable, net
Allowance for doubtful accounts	0.6	0.1
Accrued Income Receivable
Tenant Accounts Receivable, net
Allowance for doubtful accounts	0.2	0.2
Deferred Rent Receivables, Net	$ 30.7	$ 24.7

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Summary of Significant Accounting Policies - Revenue Recognition (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Revenue Recognition
Estimated amount of real estate taxes, which are the responsibility of tenants	$ 3.8	$ 2.9	$ 10.9	$ 9.2

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Summary of Significant Accounting Policies - Taxes (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Business Acquisition [Line Items]
Net income	$ 8,876,000	$ 21,839,000	$ 48,989,000	$ 23,276,000
State and local income, excise and franchise taxes	100,000	300,000	600,000	700,000
Liabilities for uncertain tax positions	0		0		$ 0
Real Estate Investment Trust
Business Acquisition [Line Items]
Net income	$ (22,000)	$ (200,000)	$ (100,000)	$ (400,000)

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Rental Property - Summary (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Property Subject to or Available for Operating Lease [Line Items]
Rental property, net	$ 2,886,079	$ 2,567,577
Deferred leasing intangibles assets, accumulated amortization	237,892	280,642
Land
Property Subject to or Available for Operating Lease [Line Items]
Rental property, net	355,590	321,560
Buildings, net of accumulated depreciation of $190,538 and $160,281, respectively
Property Subject to or Available for Operating Lease [Line Items]
Rental property, net	2,006,013	1,756,579
Rental property, accumulated depreciation	190,538	160,281
Tenant improvements, net of accumulated depreciation of $35,495 and $32,714, respectively
Property Subject to or Available for Operating Lease [Line Items]
Rental property, net	30,577	30,138
Rental property, accumulated depreciation	35,495	32,714
Building and land improvements, net of accumulated depreciation of $75,754 and $56,062, respectively
Property Subject to or Available for Operating Lease [Line Items]
Rental property, net	160,496	143,170
Rental property, accumulated depreciation	75,754	56,062
Construction in progress
Property Subject to or Available for Operating Lease [Line Items]
Rental property, net	5,669	2,877
Deferred leasing intangibles, net of accumulated amortization of $280,642 and $280,642, respectively
Property Subject to or Available for Operating Lease [Line Items]
Rental property, net	327,734	313,253
Deferred leasing intangibles assets, accumulated amortization	$ 237,892	$ 280,642

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Rental Property - Acquisitions (Details) $ in Thousands	3 Months Ended			9 Months Ended
	Sep. 30, 2018 USD ($) ft² building	Jun. 30, 2018 USD ($) ft² building	Mar. 31, 2018 USD ($) ft² building	Sep. 30, 2018 USD ($) ft² building
Business Acquisition [Line Items]
Area (in square feet)	75,400,000			75,400,000
Acquisitions 2018 [Member]
Business Acquisition [Line Items]
Area (in square feet)	7,071,377			7,071,377
Number of Buildings Acquired | building				36
Business Combination, Consideration Transferred | $				$ 458,664
Acquisitions Q1 2018 [Member]
Business Acquisition [Line Items]
Area (in square feet)			1,091,868
Number of Buildings Acquired | building			6
Business Combination, Consideration Transferred | $			$ 78,821
Fountain Inn, SC, Q1 2018 [Member]
Business Acquisition [Line Items]
Area (in square feet)			203,000
Number of Buildings Acquired | building			1
Business Combination, Consideration Transferred | $			$ 10,755
Bloomington, MN, Q1 2018 [Member]
Business Acquisition [Line Items]
Area (in square feet)			145,351
Number of Buildings Acquired | building			1
Business Combination, Consideration Transferred | $			$ 13,538
York, PA, Q1 2018 [Member]
Business Acquisition [Line Items]
Area (in square feet)			278,582
Number of Buildings Acquired | building			1
Business Combination, Consideration Transferred | $			$ 18,277
Houston, TX, Q1 2018 [Member]
Business Acquisition [Line Items]
Area (in square feet)			242,225
Number of Buildings Acquired | building			2
Business Combination, Consideration Transferred | $			$ 22,478
Greer, SC, Q1 2018 [Member]
Business Acquisition [Line Items]
Area (in square feet)			222,710
Number of Buildings Acquired | building			1
Business Combination, Consideration Transferred | $			$ 13,773
Acquisitions Q2 2018 [Member]
Business Acquisition [Line Items]
Area (in square feet)		2,726,162
Number of Buildings Acquired | building		15
Business Combination, Consideration Transferred | $		$ 185,300
McHenry, IL, Q2 2018 [Member]
Business Acquisition [Line Items]
Area (in square feet)		169,311
Number of Buildings Acquired | building		2
Business Combination, Consideration Transferred | $		$ 10,975
Caledonia, WI, Q2 2018 [Member]
Business Acquisition [Line Items]
Area (in square feet)		53,680
Number of Buildings Acquired | building		1
Business Combination, Consideration Transferred | $		$ 4,316
Clinton, PA, Q2 2018 [Member]
Business Acquisition [Line Items]
Area (in square feet)		175,000
Number of Buildings Acquired | building		1
Business Combination, Consideration Transferred | $		$ 15,380
Romulus, MI, Q2 2018 [Member]
Business Acquisition [Line Items]
Area (in square feet)		274,500
Number of Buildings Acquired | building		1
Business Combination, Consideration Transferred | $		$ 19,328
Mendota Heights, MN, Q2 2018 [Member]
Business Acquisition [Line Items]
Area (in square feet)		509,910
Number of Buildings Acquired | building		2
Business Combination, Consideration Transferred | $		$ 26,983
Fairfield, OH, Q2 2018 [Member]
Business Acquisition [Line Items]
Area (in square feet)		158,500
Number of Buildings Acquired | building		1
Business Combination, Consideration Transferred | $		$ 7,317
Baton Rouge, LA , Q2 2018 [Member]
Business Acquisition [Line Items]
Area (in square feet)		279,236
Number of Buildings Acquired | building		1
Business Combination, Consideration Transferred | $		$ 21,379
Las Vegas, NV , Q2 2018 [Member]
Business Acquisition [Line Items]
Area (in square feet)		122,472
Number of Buildings Acquired | building		1
Business Combination, Consideration Transferred | $		$ 17,920
Greer, SC , Q2 2018 [Member]
Business Acquisition [Line Items]
Area (in square feet)		131,805
Number of Buildings Acquired | building		1
Business Combination, Consideration Transferred | $		$ 5,621
Longmont, CO , Q2 2018 [Member]
Business Acquisition [Line Items]
Area (in square feet)		64,750
Number of Buildings Acquired | building		1
Business Combination, Consideration Transferred | $		$ 7,044
Florence, KY , Q2 2018 [Member]
Business Acquisition [Line Items]
Area (in square feet)		465,136
Number of Buildings Acquired | building		1
Business Combination, Consideration Transferred | $		$ 16,421
Charlotte, NC , Q2 2018 [Member]
Business Acquisition [Line Items]
Area (in square feet)		69,200
Number of Buildings Acquired | building		1
Business Combination, Consideration Transferred | $		$ 5,446
Conroe, TX , Q2 2018 [Member]
Business Acquisition [Line Items]
Area (in square feet)		252,662
Number of Buildings Acquired | building		1
Business Combination, Consideration Transferred | $		$ 27,170
Acquisitions Q3 2018 [Member]
Business Acquisition [Line Items]
Area (in square feet)	3,253,347			3,253,347
Number of Buildings Acquired | building	15
Business Combination, Consideration Transferred | $	$ 194,543
Knoxville, TN, Q3 2018 [Member]
Business Acquisition [Line Items]
Area (in square feet)	106,000			106,000
Number of Buildings Acquired | building	1
Business Combination, Consideration Transferred | $	$ 6,477
Pittsburgh, PA, Q3 2018 [Member]
Business Acquisition [Line Items]
Area (in square feet)	265,568			265,568
Number of Buildings Acquired | building	1
Business Combination, Consideration Transferred | $	$ 19,186
Raleigh/Durham, NC, Q3 2018 [Member]
Business Acquisition [Line Items]
Area (in square feet)	365,000			365,000
Number of Buildings Acquired | building	1
Business Combination, Consideration Transferred | $	$ 21,067
Detroit, MI, Q3 2018 [Member]
Business Acquisition [Line Items]
Area (in square feet)	439,150			439,150
Number of Buildings Acquired | building	1
Business Combination, Consideration Transferred | $	$ 21,077
Des Moines, IA, Q3 2018 [Member]
Business Acquisition [Line Items]
Area (in square feet)	121,922			121,922
Number of Buildings Acquired | building	1
Business Combination, Consideration Transferred | $	$ 6,053
McAllen/Edinburg/Pharr, TX, Q3 2018 [Member]
Business Acquisition [Line Items]
Area (in square feet)	270,084			270,084
Number of Buildings Acquired | building	1
Business Combination, Consideration Transferred | $	$ 18,523
Pittsburgh, PA2, Q3 2018 [Member]
Business Acquisition [Line Items]
Area (in square feet)	200,500			200,500
Number of Buildings Acquired | building	1
Business Combination, Consideration Transferred | $	$ 11,327
Minneapolis/St Paul, MN, Q3 2018 [Member]
Business Acquisition [Line Items]
Area (in square feet)	120,606			120,606
Number of Buildings Acquired | building	1
Business Combination, Consideration Transferred | $	$ 8,422
Milwaukee/Madison, WI, Q3 2018 [Member]
Business Acquisition [Line Items]
Area (in square feet)	100,800			100,800
Number of Buildings Acquired | building	1
Business Combination, Consideration Transferred | $	$ 7,484
Milwaukee/Madison, WI2, Q3 2018 [Member]
Business Acquisition [Line Items]
Area (in square feet)	174,633			174,633
Number of Buildings Acquired | building	2
Business Combination, Consideration Transferred | $	$ 13,288
Chicago, IL, Q3 2018 [Member]
Business Acquisition [Line Items]
Area (in square feet)	105,637			105,637
Number of Buildings Acquired | building	1
Business Combination, Consideration Transferred | $	$ 6,368
Indianapolis, IN, Q3 2018 [Member]
Business Acquisition [Line Items]
Area (in square feet)	478,721			478,721
Number of Buildings Acquired | building	1
Business Combination, Consideration Transferred | $	$ 29,085
Augusta/Richmond County, GA, Q3 2018 [Member]
Business Acquisition [Line Items]
Area (in square feet)	203,726			203,726
Number of Buildings Acquired | building	1
Business Combination, Consideration Transferred | $	$ 9,379
Charlotte, NC, Q3 2018 [Member]
Business Acquisition [Line Items]
Area (in square feet)	301,000			301,000
Number of Buildings Acquired | building	1
Business Combination, Consideration Transferred | $	$ 16,807

XML

Rental Property - Acquisitions - Allocation of Consideration (Details) - Acquisitions 2018 [Member] $ in Thousands	9 Months Ended
	Sep. 30, 2018 USD ($)
Allocation of the consideration paid for the acquired assets and liabilities
Land	$ 39,340
Buildings	317,293
Tenant improvements	4,849
Building and land improvements	21,731
Other assets	794
Other liabilities	242
Total purchase price	458,664
In-place leases
Allocation of the consideration paid for the acquired assets and liabilities
Deferred leasing intangibles	$ (52,276)
Weighted average amortization period of lease intangibles	8 years 7 months 25 days
Tenant relationships
Allocation of the consideration paid for the acquired assets and liabilities
Deferred leasing intangibles	$ (21,861)
Weighted average amortization period of lease intangibles	11 years 9 months 10 days
Above market leases
Allocation of the consideration paid for the acquired assets and liabilities
Deferred leasing intangibles	$ (4,062)
Weighted average amortization period of lease intangibles	8 years 2 months 10 days
Below market leases
Allocation of the consideration paid for the acquired assets and liabilities
Deferred leasing intangibles	$ 3,122
Weighted average amortization period of lease intangibles	6 years 7 months 25 days
Above market ground leases
Allocation of the consideration paid for the acquired assets and liabilities
Deferred leasing intangibles	$ (178)
Weighted average amortization period of lease intangibles	48 years 1 month

XML

Rental Property - Acquisitions - Results of Operations (Details) - Acquisitions 2018 [Member] - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2018
Business Acquisition [Line Items]
Revenue	$ 7,122	$ 11,156
Net income (loss)	$ 1,556	$ 1,642

XML

Rental Property - Disposals (Details) ft² in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018 USD ($) ft² building	Sep. 30, 2017 USD ($)	Sep. 30, 2018 USD ($) ft² building	Sep. 30, 2017 USD ($)	Dec. 31, 2017 USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of buildings disposed | building	381		381
Area (in square feet) | ft²	75.4		75.4
Carrying value of property sold	$ 2,886,079,000		$ 2,886,079,000		$ 2,567,577,000
Disposal Group, Disposed of by Sale, Not Discontinued Operations | 2018 Disposals [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of buildings disposed | building	11		11
Area (in square feet) | ft²	2.0		2.0
Carrying value of property sold	$ 57,100,000		$ 57,100,000
Contribution to revenue	100,000	$ 2,600,000	2,700,000	$ 7,700,000
Disposal Group, Including Discontinued Operation, Operating Income (Loss)	$ 5,000	$ 500,000	100,000	$ 1,400,000
Net proceeds from sales of rental property			89,400,000
Gain (Loss) on Sale			$ 32,300,000

XML

Rental Property - Loss on Impairments (Details) $ in Thousands	3 Months Ended	9 Months Ended
	Mar. 31, 2018 USD ($) building Rate	Sep. 30, 2018 USD ($)
2018 Impairments [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Loss on Impairment | $	$ 2,934	$ 2,934
2018 Impairments [Member] | Income Approach Valuation Technique | Fair Value, Inputs, Level 3
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Fair Value Disclosure | $	$ 3,176	$ 3,176
2018 Impairments [Member] | Income Approach Valuation Technique | Minimum | Fair Value, Inputs, Level 3
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Fair Value Inputs Exit Capitalization Rate	11.00%
2018 Impairments [Member] | Income Approach Valuation Technique | Maximum | Fair Value, Inputs, Level 3
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Fair Value Inputs Exit Capitalization Rate	13.00%
Buena Vista, VA, Q3 2012
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of Buildings Impaired | building	1
Sergeant Bluff, IA, Q4 2007
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of Buildings Impaired | building	1
Measurement Input, Discount Rate [Member] | 2018 Impairments [Member] | Income Approach Valuation Technique | Minimum | Fair Value, Inputs, Level 3
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Fair Value Inputs, Discount Rates	11.00%
Measurement Input, Discount Rate [Member] | 2018 Impairments [Member] | Income Approach Valuation Technique | Maximum | Fair Value, Inputs, Level 3
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Fair Value Inputs, Discount Rates	14.50%

XML

Rental Property - Deferred Leasing Intangibles (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Finite-Lived Intangible Assets [Line Items]
Deferred leasing intangibles, gross	$ 565,626		$ 565,626		$ 593,895
Deferred leasing intangibles assets, accumulated amortization	(237,892)		(237,892)		(280,642)
Deferred leasing intangibles, net	327,734		327,734		313,253
Below market lease, gross	33,751		33,751		34,776
Below market lease, accumulated amortization	(13,043)		(13,043)		(13,555)
Below market lease, net	20,708		20,708		21,221
Net decrease to rental revenue related to above and below market lease amortization	1,150	$ 1,318	3,206	$ 3,873
Above market leases
Finite-Lived Intangible Assets [Line Items]
Deferred leasing intangibles, gross	70,454		70,454		78,558
Deferred leasing intangibles assets, accumulated amortization	(31,663)		(31,663)		(36,810)
Deferred leasing intangibles, net	38,791		38,791		41,748
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 2018	927		927
2019	3,926		3,926
2020	3,546		3,546
2021	2,163		2,163
2022	1,154		1,154
Other intangible lease assets
Finite-Lived Intangible Assets [Line Items]
Deferred leasing intangibles, gross	495,172		495,172		515,337
Deferred leasing intangibles assets, accumulated amortization	(206,229)		(206,229)		(243,832)
Deferred leasing intangibles, net	288,943		288,943		$ 271,505
Amortization expense related to other intangible lease assets	20,361	$ 17,934	56,698	$ 53,747
Estimated Net Amortization of In-Place Leases, Leasing Commissions and Tenant Relationships
Remainder of 2018	17,263		17,263
2019	57,841		57,841
2020	47,750		47,750
2021	37,229		37,229
2022	$ 29,690		$ 29,690

XML

Debt - Summary (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2018	Dec. 31, 2017	Jul. 26, 2018	Apr. 10, 2018
Debt Instrument [Line Items]
Long-term debt, gross	$ 1,327,476	$ 1,179,855
Unamortized debt issuance costs	(7,061)	(6,135)
Debt Instrument, Unused Borrowing Capacity, Amount	574,400
Unamortized fair market value premium	52	61
Principal outstanding	$ 1,320,467	1,173,781
Weighted average interest rate	3.69%
Interest Rate Swaps
Debt Instrument [Line Items]
Notional amount	$ 600,000
London Interbank Offered Rate (LIBOR) [Member]
Debt Instrument [Line Items]
Stated interest rate	2.26056%
$175 Million Unsecured Term Loan E [Member]
Debt Instrument [Line Items]
Debt Instrument, Unused Borrowing Capacity, Amount	$ 175,000
Mortgage Loans Payable
Debt Instrument [Line Items]
Long-term debt, gross	57,476	58,855
Unamortized debt issuance costs	(535)	(634)
Unamortized fair market value premium	52	61
Principal outstanding	56,993	58,282
Mortgage Loans Payable | Wells Fargo Bank, National Association CMBS Loan
Debt Instrument [Line Items]
Long-term debt, gross	$ 53,652	54,949
Stated interest rate	4.31%
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	$ 3,824	3,906
Stated interest rate	4.78%
Penalty free prepayment period	3 months
Unsecured Term Loans
Debt Instrument [Line Items]
Long-term debt, gross	$ 600,000	450,000
Unamortized debt issuance costs	(3,915)	(3,735)
Principal outstanding	596,085	446,265
Unsecured Term Loans | $150 Million Wells Fargo Unsecured Term Loan C
Debt Instrument [Line Items]
Long-term debt, gross	$ 150,000	$ 150,000
Unsecured Term Loans | $150 Million Wells Fargo Unsecured Term Loan C | London Interbank Offered Rate (LIBOR) [Member]
Debt Instrument [Line Items]
Interest rate margin (as a percent)	1.30%	1.30%
Unsecured Term Loans | $150 Million Wells Fargo Unsecured Term Loan B
Debt Instrument [Line Items]
Long-term debt, gross	$ 150,000	$ 150,000
Unsecured Term Loans | $150 Million Wells Fargo Unsecured Term Loan B | London Interbank Offered Rate (LIBOR) [Member]
Debt Instrument [Line Items]
Interest rate margin (as a percent)	1.30%	1.30%
Unsecured Term Loans | $150 Million Wells Fargo Unsecured Term Loan A
Debt Instrument [Line Items]
Long-term debt, gross	$ 150,000	$ 150,000
Unsecured Term Loans | $150 Million Wells Fargo Unsecured Term Loan A | London Interbank Offered Rate (LIBOR) [Member]
Debt Instrument [Line Items]
Interest rate margin (as a percent)	1.30%	1.30%
Unsecured Term Loans | $150 Million Unsecured Term Loan D [Member]
Debt Instrument [Line Items]
Long-term debt, gross	$ 150,000	$ 0
Unsecured Term Loans | $150 Million Unsecured Term Loan D [Member] | London Interbank Offered Rate (LIBOR) [Member]
Debt Instrument [Line Items]
Interest rate margin (as a percent)	1.30%	1.30%
Unsecured Term Loans | $175 Million Unsecured Term Loan E [Member]
Debt Instrument [Line Items]
Long-term debt, gross	$ 0	$ 0	$ 175,000
Unsecured Term Loans | $175 Million Unsecured Term Loan E [Member] | London Interbank Offered Rate (LIBOR) [Member]
Debt Instrument [Line Items]
Interest rate margin (as a percent)	1.20%
Unsecured Notes
Debt Instrument [Line Items]
Long-term debt, gross	$ 575,000	400,000
Unamortized debt issuance costs	(2,611)	(1,766)
Principal outstanding	572,389	398,234
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%
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%
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%
Unsecured Notes | $75 Million Series G Unsecured Notes [Member]
Debt Instrument [Line Items]
Long-term debt, gross	$ 75,000	0
Stated interest rate	4.10%			4.10%
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%
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%
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%
Unsecured Notes | $100 Million Series H Unsecured Notes [Member]
Debt Instrument [Line Items]
Long-term debt, gross	$ 100,000	0
Stated interest rate	4.27%			4.27%
Unsecured Credit Facility
Debt Instrument [Line Items]
Principal outstanding	$ 95,000	$ 271,000
Maximum borrowing capacity	$ 500,000		$ 500,000
Unsecured Credit Facility | London Interbank Offered Rate (LIBOR) [Member]
Debt Instrument [Line Items]
Interest rate margin (as a percent)	1.05%	1.15%
Unsecured Credit Facility | Prepaid Expenses and Other Assets
Debt Instrument [Line Items]
Unamortized debt issuance costs	$ (3,400)	$ (1,500)

XML

Debt - 2018 Activity (Details)			3 Months Ended		9 Months Ended
	Jul. 27, 2018 USD ($)	Mar. 28, 2018 USD ($)	Sep. 30, 2018 USD ($)	Sep. 30, 2017 USD ($)	Sep. 30, 2018 USD ($) advance Rate	Sep. 30, 2017 USD ($)	Apr. 10, 2018 USD ($) Rate	Dec. 31, 2017 USD ($)
Debt Instrument [Line Items]
Debt Instrument, Unused Borrowing Capacity, Amount			$ 574,400,000		$ 574,400,000
Amortization of deferred financing fees			617,000	$ 546,000	1,698,000	$ 1,553,000
Net book value of properties that are collateral for debt arrangements			88,400,000		$ 88,400,000			$ 90,900,000
Unsecured Credit Facility
Debt Instrument [Line Items]
Write off of Deferred Debt Issuance Cost			13,000
Line of Credit Facility, Commitment Fee Percentage | Rate					0.15%
Debt Instrument, Fee Amount			50,000		$ 50,000
Accounts Payable and Accrued Liabilities [Member]
Debt Instrument [Line Items]
Interest payable			7,700,000		7,700,000			$ 5,600,000
$175 Million Unsecured Term Loan E [Member]
Debt Instrument [Line Items]
Debt Instrument, Unused Borrowing Capacity, Amount			175,000,000		175,000,000
$175 Million Unsecured Term Loan E [Member] | Unsecured Term Loans
Debt Instrument [Line Items]
Line of Credit Facility, Accordion Feature, Increase Limit			350,000,000		$ 350,000,000
Debt Instrument, Accordion Feature, Number of Advances, Maximum | advance					6
Debt Instrument, Accordion Feature, Increase Limit, Minimum Advance					$ 25,000,000
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage | Rate					0.15%
Debt Instrument, Fee Amount			$ 35,000		$ 35,000
$75 Million Series G Unsecured Notes [Member] | Unsecured Notes
Debt Instrument [Line Items]
Debt Instrument, Face Amount							$ 75,000,000
Stated interest rate			4.10%		4.10%		4.10%
$100 Million Series H Unsecured Notes [Member] | Unsecured Notes
Debt Instrument [Line Items]
Debt Instrument, Face Amount							$ 100,000,000
Stated interest rate			4.27%		4.27%		4.27%
$150 Million Unsecured Term Loan D [Member] | Unsecured Term Loans
Debt Instrument [Line Items]
Proceeds from Issuance of Debt	$ 75,000,000	$ 75,000,000
Interest Expense [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Commitment Fee Amount			$ 275,000	$ 286,000	$ 928,000	$ 839,000

XML

Debt - Fair Value (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Debt Instrument [Line Items]
Long-term debt, gross	$ 1,327,476	$ 1,179,855
Unamortized fair market value premium	52	61
Unamortized debt issuance costs	(7,061)	(6,135)
Principal outstanding	1,320,467	1,173,781
Long-term debt, fair value	1,329,764	1,198,359
Unsecured Credit Facility
Debt Instrument [Line Items]
Principal outstanding	95,000	271,000
Long-term debt, fair value	95,000	271,528
Unsecured Term Loans
Debt Instrument [Line Items]
Long-term debt, gross	600,000	450,000
Unamortized debt issuance costs	(3,915)	(3,735)
Principal outstanding	596,085	446,265
Long-term debt, fair value	607,663	451,463
Unsecured Notes
Debt Instrument [Line Items]
Long-term debt, gross	575,000	400,000
Unamortized debt issuance costs	(2,611)	(1,766)
Principal outstanding	572,389	398,234
Long-term debt, fair value	569,493	415,599
Mortgage Loans Payable
Debt Instrument [Line Items]
Long-term debt, gross	57,476	58,855
Unamortized fair market value premium	52	61
Unamortized debt issuance costs	(535)	(634)
Principal outstanding	56,993	58,282
Long-term debt, fair value	$ 57,608	$ 59,769

XML

Use of Derivative Financial Instruments - Risk Management and Unsecured Loan Swaps (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Interest Rate Swaps
Unsecured Term Loan Swaps
Notional amount assets	$ 900,000	$ 475,000
Interest Rate Derivative, Regions Bank, March 01, 2013
Unsecured Term Loan Swaps
Notional amount assets	25,000
Fair value	$ 471
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
Fair value	$ 703
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
Fair value	$ 344
Fixed Interest Rate (as a percent)	1.703%
Interest Rate Derivative, Regions Bank, February 03, 2014
Unsecured Term Loan Swaps
Notional amount assets	$ 25,000
Fair value	$ 245
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
Fair value	$ 700
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
Fair value	$ 1,391
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
Fair value	$ 978
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
Fair value	$ 695
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
Fair value	$ 417
Fixed Interest Rate (as a percent)	1.395%
Interest Rate Derivative, Royal Bank of Canada, March 20, 2015
Unsecured Term Loan Swaps
Notional amount assets	$ 25,000
Fair value	$ 684
Fixed Interest Rate (as a percent)	1.709%
Interest Rate Derivative, The Toronto-Dominion Bank, March 20, 2015
Unsecured Term Loan Swaps
Notional amount assets	$ 25,000
Fair value	$ 682
Fixed Interest Rate (as a percent)	1.7105%
Interest Rate Derivative, The Toronto-Dominion Bank, September 10, 2017
Unsecured Term Loan Swaps
Notional amount assets	$ 100,000
Fair value	$ 1,488
Fixed Interest Rate (as a percent)	2.2255%
Interest Rate Derivative, Wells Fargo Bank, March 20, 2015
Unsecured Term Loan Swaps
Notional amount assets	$ 25,000
Fair value	$ 886
Fixed Interest Rate (as a percent)	1.828%
Interest Rate Derivative, The Toronto-Dominion Bank, February 14, 2020
Unsecured Term Loan Swaps
Notional amount assets	$ 25,000
Fair value	$ 271
Fixed Interest Rate (as a percent)	2.4535%
Interest Rate Derivative, Regions Bank, February 14, 2020
Unsecured Term Loan Swaps
Notional amount assets	$ 50,000
Fair value	$ 520
Fixed Interest Rate (as a percent)	2.475%
Interest Rate Derivative, Capital One, February 14, 2020
Unsecured Term Loan Swaps
Notional amount assets	$ 50,000
Fair value	$ 467
Fixed Interest Rate (as a percent)	2.53%
Interest Rate Derivative, The Toronto-Dominion Bank, October 30, 2017
Unsecured Term Loan Swaps
Notional amount assets	$ 25,000
Fair value	$ 1,054
Fixed Interest Rate (as a percent)	1.8485%
Interest Rate Derivative, Royal Bank of Canada, October 30, 2017
Unsecured Term Loan Swaps
Notional amount assets	$ 25,000
Fair value	$ 1,054
Fixed Interest Rate (as a percent)	1.8505%
Interest Rate Derivative, Wells Fargo Bank, October 30, 2017
Unsecured Term Loan Swaps
Notional amount assets	$ 25,000
Fair value	$ 1,055
Fixed Interest Rate (as a percent)	1.8505%
Interest Rate Derivative, PNC Bank, $25m, October 30, 2017
Unsecured Term Loan Swaps
Notional amount assets	$ 25,000
Fair value	$ 1,052
Fixed Interest Rate (as a percent)	1.8485%
Interest Rate Derivative, PNC Bank, $50m, October 30, 2017
Unsecured Term Loan Swaps
Notional amount assets	$ 50,000
Fair value	$ 2,105
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 assets	$ 50,000
Fair value	$ 111
Fixed Interest Rate (as a percent)	2.918%
Interest Rate Derivative, PNC Bank, July 26, 2019 [Member]
Unsecured Term Loan Swaps
Notional amount assets	$ 50,000
Fair value	$ 106
Fixed Interest Rate (as a percent)	2.919%
Interest Rate Derivative, Bank of Montreal, July 26, 2019 [Member]
Unsecured Term Loan Swaps
Notional amount assets	$ 50,000
Fair value	$ 113
Fixed Interest Rate (as a percent)	2.919%
Interest Rate Derivative, US Bank, July 26, 2019 [Member]
Unsecured Term Loan Swaps
Notional amount assets	$ 25,000
Fair value	$ 57
Fixed Interest Rate (as a percent)	2.919%

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Use of Derivative Financial Instruments - FV of Interest Rate Swaps (Details) - Interest Rate Swaps - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Fair value of the interest rate swaps outstanding
Notional amount assets	$ 900,000	$ 475,000
Fair value - assets	17,649	6,079
Notional amount liabilities	0	250,000
Fair Value - liabilities	$ 0	$ (1,217)

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Use of Derivative Financial Instruments - Cash Flow Hedges and Contingent Features (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
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	$ 12,698	$ 10,446	$ 35,602	$ 31,557
Interest Rate Swaps
Cash Flow Hedges of Interest Rate Risk
Additional amount reclassified from accumulated other comprehensive income (loss) as a decrease to interest expense over the next twelve months	(5,100)		(5,100)
Income (loss) recognized in accumulated other comprehensive income on interest rate swaps	2,572	316	13,349	(1,126)
Income (loss) reclassified from accumulated other comprehensive income into income (loss) as interest expense	512	(282)	538	(1,426)
Total interest expense presented in the Consolidated Statements of Operations in which the effects of cash flow hedges are recorded	$ 12,698	$ 10,446	$ 35,602	$ 31,557

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Use of Derivative Financial Instruments - FV on Recurring Basis (Details) - Interest Rate Swaps - Fair value on recurring basis - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Assets (liabilities):
Interest rate swaps-Asset	$ 17,649	$ 6,079
Interest rate swaps-Liability	0	(1,217)
Level 1
Assets (liabilities):
Interest rate swaps-Asset	0	0
Interest rate swaps-Liability	0	0
Level 2
Assets (liabilities):
Interest rate swaps-Asset	17,649	6,079
Interest rate swaps-Liability	0	(1,217)
Level 3
Assets (liabilities):
Interest rate swaps-Asset	0	0
Interest rate swaps-Liability	$ 0	$ 0

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Equity - Preferred Stock (Details) - USD ($) $ / shares in Units, $ in Thousands			3 Months Ended							9 Months Ended		12 Months Ended
	Oct. 10, 2018	Jun. 11, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017	Jul. 11, 2018
Class of Stock [Line Items]
Preferred Stock Redemption Premium			$ 0				$ 0			$ 2,661	$ 0
Preferred stock, shares authorized			15,000,000			15,000,000				15,000,000		15,000,000
Preferred stock, par value (in dollars per share)			$ 0.01			$ 0.01				$ 0.01		$ 0.01
Series B Preferred Stock
Class of Stock [Line Items]
Stock Redeemed or Called During Period, Shares		2,800,000
Dividend rate (as a percent)		6.625%
Preferred Stock Redemption Premium										$ 2,700
Preferred Stock, Redemption Price Per Share													$ 25.00
Preferred stock, shares issued			0			2,800,000				0		2,800,000
Preferred stock, liquidation preference (in dollars per share)			$ 0.00			$ 25.00				$ 0.00		$ 25.00
Number of shares outstanding		2,800,000	0			2,800,000				0		2,800,000
Preferred Stock, Dividends Per Share, Declared			$ 0.0460069	$ 0.4140625	$ 0.4140625	$ 0.4140625	$ 0.4140625	$ 0.4140625	$ 0.4140625	$ 0.8741319		$ 1.6562500
Dividends Payable, Date Declared			Jul. 11, 2018	Apr. 10, 2018	Feb. 14, 2018	Nov. 02, 2017	Jul. 31, 2017	May 01, 2017	Feb. 15, 2017
Dividends Payable, Date to be Paid			Oct. 01, 2018	Jul. 02, 2018	Apr. 02, 2018	Dec. 29, 2017	Sep. 29, 2017	Jun. 30, 2017	Mar. 31, 2017
Series C Preferred Stock
Class of Stock [Line Items]
Dividend rate (as a percent)										6.875%
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
Number of shares outstanding			3,000,000			3,000,000				3,000,000		3,000,000
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. 11, 2018	Apr. 10, 2018	Feb. 14, 2018	Nov. 02, 2017	Jul. 31, 2017	May 01, 2017	Feb. 15, 2017
Dividends Payable, Date to be Paid			Oct. 01, 2018	Jul. 02, 2018	Apr. 02, 2018	Dec. 29, 2017	Sep. 29, 2017	Jun. 30, 2017	Mar. 31, 2017
Series C Preferred Stock | Scenario, Forecast [Member]
Class of Stock [Line Items]
Preferred Stock, Dividends Per Share, Declared	$ 0.4296875

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Equity - Common Stock ATM (Details) - USD ($) $ / shares in Units, $ in Thousands	9 Months Ended		12 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Class of Stock [Line Items]
Proceeds from sales of common stock	$ 276,457	$ 339,624
At The Market Program 2017 $500 Million | Common Stock
Class of Stock [Line Items]
Common Stock Value Authorized under Stock Offering Program	500,000
Aggregate value of common stock available to be sold under the ATM	$ 213,217
Number of shares sold	10,387,962		363,843
Proceeds from sales of common stock	$ 276,457		$ 10,326
Sales agents' fee	2,888		129
Net proceeds	$ 273,569		$ 10,197
At The Market Program 2017 $300 Million | Common Stock
Class of Stock [Line Items]
Number of shares sold			11,098,748
Proceeds from sales of common stock			$ 300,000
Sales agents' fee			3,637
Net proceeds			$ 296,363
At The Market Program 2016 $228 Million | Common Stock
Class of Stock [Line Items]
Number of shares sold			4,799,784
Proceeds from sales of common stock			$ 117,216
Sales agents' fee			1,604
Net proceeds			$ 115,612
At The Market (ATM) Program | Common Stock
Class of Stock [Line Items]
Number of shares sold	10,387,962		16,262,375
Proceeds from sales of common stock	$ 276,457		$ 427,542
Sales agents' fee	2,888		5,370
Net proceeds	$ 273,569		$ 422,172
Weighted Average | At The Market Program 2017 $500 Million | Common Stock
Class of Stock [Line Items]
Issue price (in dollars per share)	$ 26.61		$ 28.38
Weighted Average | At The Market Program 2017 $300 Million | Common Stock
Class of Stock [Line Items]
Issue price (in dollars per share)			27.03
Weighted Average | At The Market Program 2016 $228 Million | Common Stock
Class of Stock [Line Items]
Issue price (in dollars per share)			24.42
Weighted Average | At The Market (ATM) Program | Common Stock
Class of Stock [Line Items]
Issue price (in dollars per share)	$ 26.61		$ 26.29

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Equity - Common Stock Dividends (Details) - Common Stock - $ / shares																													9 Months Ended	12 Months Ended
	Oct. 15, 2018	Oct. 10, 2018	Sep. 17, 2018	Aug. 15, 2018	Jul. 16, 2018	Jul. 11, 2018	Jun. 15, 2018	May 15, 2018	Apr. 16, 2018	Apr. 10, 2018	Mar. 15, 2018	Feb. 15, 2018	Jan. 16, 2018	Dec. 15, 2017	Nov. 15, 2017	Nov. 02, 2017	Oct. 16, 2017	Sep. 15, 2017	Aug. 15, 2017	Jul. 31, 2017	Jul. 17, 2017	Jun. 15, 2017	May 15, 2017	May 01, 2017	Apr. 17, 2017	Mar. 15, 2017	Feb. 15, 2017	Nov. 02, 2016	Sep. 30, 2018	Dec. 31, 2017
Class of Stock [Line Items]
Common Stock, Dividends, Per Share, Cash Paid			$ 0.118333	$ 0.118333	$ 0.118333		$ 0.118333	$ 0.118333	$ 0.118333		$ 0.118333	$ 0.118333	$ 0.117500	$ 0.117500	$ 0.117500		$ 0.117500	$ 0.117500	$ 0.117500		$ 0.116667	$ 0.116667	$ 0.116667		$ 0.116667	$ 0.116667	$ 0.116667		$ 1.064997	$ 1.405002
Common Stock, Dividends, Per Share, Declared						$ 0.118333				$ 0.118333						$ 0.118333				$ 0.117500				$ 0.117500			$ 0.116667	$ 0.116667	$ 1.064997	$ 1.405002
Scenario, Forecast [Member]
Class of Stock [Line Items]
Common Stock, Dividends, Per Share, Cash Paid	$ 0.118333
Common Stock, Dividends, Per Share, Declared		$ 0.118333

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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
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Shares
Unvested at beginning of period (in shares)			237,207	272,337	272,337
Granted (in shares)			76,659		75,001
Vested (in shares)	0	0	(112,405)	(109,209)	(109,209)
Forfeited (in shares)			(10,630)		(922)
Unvested at end of period (in shares)	190,831		190,831		237,207
Stock Repurchased and Retired During Period, Shares			41,975		40,836
Unrecognized compensation costs	$ 3,100		$ 3,100
Unrecognized compensation costs, period for recognition			2 years 5 months 20 days
Vested (in shares)	0	0	(112,405)	(109,209)	(109,209)
Fair value of shares vested	$ 0	$ 0	$ 3,002	$ 2,591
Granted on January 5, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period (in years)			4 years
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value			$ 26.40
Granted on January 6, 2017 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value					$ 24.41

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Noncontrolling Interest - Summary (Details) - shares	9 Months Ended	12 Months Ended
	Sep. 30, 2018	Dec. 31, 2017	Dec. 31, 2016
Noncontrolling interest
Noncontrolling interest ownership percentage	3.60%	4.10%	4.30%
Noncontrolling Interest - Unit holders in Operating Partnership
Noncontrolling interest
Units outstanding, balance at beginning of period (in units)	4,096,687	3,633,881
Granted/Issued	324,802	814,066
Forfeited	0	0
Conversions from LTIP units to Other Common Units	0	0
Redemptions from Other Common Units to common stock	352,055	351,260
Units outstanding, balance at end of period (in units)	4,069,434	4,096,687
LTIP Units | Noncontrolling Interest - Unit holders in Operating Partnership
Noncontrolling interest
Units outstanding, balance at beginning of period (in units)	1,457,070	1,576,516
Granted/Issued	324,802	126,239
Forfeited	0	0
Conversions from LTIP units to Other Common Units	165,672	245,685
Redemptions from Other Common Units to common stock	0	0
Units outstanding, balance at end of period (in units)	1,616,200	1,457,070
Other Common Units | Noncontrolling Interest - Unit holders in Operating Partnership
Noncontrolling interest
Units outstanding, balance at beginning of period (in units)	2,639,617	2,057,365
Granted/Issued	0	687,827
Forfeited	0	0
Conversions from LTIP units to Other Common Units	(165,672)	(245,685)
Redemptions from Other Common Units to common stock	352,055	351,260
Units outstanding, balance at end of period (in units)	2,453,234	2,639,617

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Noncontrolling Interest - LTIP FV Assumptions (Details) - LTIP Units - USD ($) $ / shares in Units, $ in Thousands			9 Months Ended	12 Months Ended
	Mar. 12, 2018	Jan. 05, 2018	Sep. 30, 2018	Dec. 31, 2017
Assumptions
LTIP units at issuance			324,802	126,239
Granted on March 12, 2018
Assumptions
Expected term (years)	10 years
Expected volatility	22.00%
Expected dividend yield	6.00%
Risk-free interest rate	2.46%
Fair value of LTIP units at issuance (in thousands)	$ 90
LTIP units at issuance	3,930
Fair value unit price per LTIP unit at issuance	$ 22.90
Granted on January 5, 2018
Assumptions
Expected term (years)		10 years
Expected volatility		22.00%
Expected dividend yield		6.00%
Risk-free interest rate		2.09%
Fair value of LTIP units at issuance (in thousands)		$ 3,447
LTIP units at issuance		137,616
Fair value unit price per LTIP unit at issuance		$ 25.05
Executive Officer [Member] | Share-based Compensation Award, Tranche One [Member] | Granted on January 5, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period (in years)		4 years

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Noncontrolling Interest - LTIP Units (Details) - LTIP Units - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation costs	$ 5,700		$ 5,700
Unrecognized compensation costs, period for recognition			2 years 5 months 20 days
Units
Unvested at beginning of period (in shares)			300,307	403,423	403,423
Granted (in shares)			324,802		126,239
Vested (in shares)	(30,949)	(44,942)	(342,940)	(157,816)	(229,355)
Forfeited (in shares)			0		0
Unvested at end of period (in shares)	282,169		282,169		300,307
Fair value of shares vested	$ 851	$ 1,235	$ 9,002	$ 4,146

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Equity Incentive Plan - Performance Plan Assumptions (Details) - Performance shares - Awarded in 2018 $ in Thousands	Jan. 05, 2018 USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected volatility	22.00%
Expected dividend yield	6.00%
Risk-free interest rate	2.09%
Fair value of performance units grant (in thousands)	$ 5,456

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Equity Incentive Plan - 2018 Activity (Details) - USD ($) $ in Thousands			3 Months Ended		9 Months Ended
	Apr. 30, 2018	Jan. 01, 2018	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
LTIP Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value			$ 851	$ 1,235	$ 9,002	$ 4,146
Unrecognized compensation costs			5,700		$ 5,700
Unrecognized compensation costs, period for recognition					2 years 5 months 20 days
Performance shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation costs			$ 6,100		$ 6,100
Unrecognized compensation costs, period for recognition					2 years 3 months 20 days
Equity Incentive Plan2011 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Shares Authorized	3,000,000
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized	6,642,461
Outperformance Program2015 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period (in years)		3 years
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value		$ 6,200
Outperformance Program2015 [Member] | LTIP Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock Issued During Period, Shares, Share-based Compensation, Gross		183,256
Outperformance Program2015 [Member] | Common Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock Issued During Period, Shares, Share-based Compensation, Gross		53,722
Stock Repurchased and Retired During Period, Shares		15,183

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Equity Incentive Plan - Equity Non-cash Compensation Expense (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Common Stock
Equity Incentive Plan
Number of days of average trailing stock price used to calculate number of shares of common stock granted			10 days
General and Administrative Expenses
Equity Incentive Plan
Share-based compensation	$ 2,236	$ 2,384	$ 6,671	$ 7,159
General and Administrative Expenses | Independent Director
Equity Incentive Plan
Share-based compensation	99	87	285	265
General and Administrative Expenses | Restricted stock
Equity Incentive Plan
Share-based compensation	406	594	1,269	1,776
General and Administrative Expenses | LTIP Units
Equity Incentive Plan
Share-based compensation	893	1,167	2,654	3,508
General and Administrative Expenses | Performance shares
Equity Incentive Plan
Share-based compensation	$ 838	$ 536	$ 2,463	$ 1,610

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Earnings Per Share (Details) - shares	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Earnings Per Share [Abstract]
Participating securities	193,117	237,207	196,871	238,129

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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, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Numerator
Net income	$ 8,876	$ 21,839	$ 48,989	$ 23,276
Less: preferred stock dividends	1,289	2,449	6,315	7,345
Preferred Stock Redemption Premium	0	0	2,661	0
Less: amount allocated to participating securities	69	84	209	250
Less: income attributable to noncontrolling interest after preferred stock dividends	281	828	1,589	673
Net income attributable to common stockholders	$ 7,237	$ 18,478	$ 38,215	$ 15,008
Denominator
Weighted average common shares outstanding — basic	105,783	92,787	101,095	87,632
Share-based compensation	550	648	400	606
Weighted average common shares outstanding — diluted	106,333	93,435	101,495	88,238
Net income per share — basic and diluted
Net income per share attributable to common stockholders — basic	$ 0.07	$ 0.20	$ 0.38	$ 0.17
Net income per share attributable to common stockholders — diluted	$ 0.07	$ 0.20	$ 0.38	$ 0.17
Restricted stock
Net income per share — basic and diluted
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	193	237	197	238

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Commitments and Contingencies - Agreements (Details) $ in Millions	Sep. 30, 2018 USD ($)
Commitments and Contingencies Disclosure [Abstract]
Letters of credit outstanding	$ 5.6