LXP Industrial Trust (LXP) 10-K 12 Mar 19 2018 FY Annual report Financial data

Document and Entity Information

Document and Entity Information - USD ($)	12 Months Ended
	Dec. 31, 2018	Mar. 08, 2019	Jun. 29, 2018
Document and Entity Information [Abstract]
Entity Registrant Name	LEXINGTON REALTY TRUST
Entity Central Index Key	0000910108
Current Fiscal Year End Date	--12-31
Entity Well-known Seasoned User	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Public Float			$ 2,044,256,426
Entity Common Stock, Shares Outstanding (in shares)		235,282,784
Document Fiscal Year Focus	2018
Document Fiscal Period Focus	FY
Document Type	10-K
Amendment Flag	false
Document Period Ended Date	Dec. 31, 2018

CONSOLIDATED BALANCE SHEETS

CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Assets:
Real estate, at cost	$ 3,090,134	$ 3,936,459
Real estate - intangible assets	419,612	599,091
Real estate, gross	3,509,746	4,535,550
Less: accumulated depreciation and amortization	954,087	1,225,650
Real estate, net	2,555,659	3,309,900
Assets held for sale	63,868	2,827
Cash and cash equivalents	168,750	107,762
Restricted cash	8,497	4,394
Investment in and advances to non-consolidated entities	66,183	17,476
Deferred expenses (net of accumulated amortization of $27,397 in 2018 and $35,072 in 2017)	15,937	31,693
Rent receivable - current	3,475	5,450
Rent receivable – deferred	58,692	52,769
Other assets	12,779	20,749
Total assets	2,953,840	3,553,020
Liabilities:
Mortgages and notes payable, net	570,420	689,810
Revolving credit facility borrowings	0	160,000
Term loans payable, net	298,733	596,663
Senior notes payable, net	496,034	495,198
Trust preferred securities, net	127,296	127,196
Dividends payable	48,774	49,504
Liabilities held for sale	386	0
Accounts payable and other liabilities	30,790	38,644
Accrued interest payable	4,523	5,378
Deferred revenue - including below market leases (net of accumulated accretion of $17,606 in 2018 and $26,081 in 2017)	20,531	33,182
Prepaid rent	9,675	16,610
Total liabilities	1,607,162	2,212,185
Commitments and contingencies
Equity:
Preferred shares, par value $0.0001 per share; authorized 100,000,000 shares, Series C Cumulative Convertible Preferred, liquidation preference $96,770 and 1,935,400 shares issued and outstanding	94,016	94,016
Common shares, par value $0.0001 per share; authorized 400,000,000 shares, 235,008,554 and 240,689,081 shares issued and outstanding in 2018 and 2017, respectively	24	24
Additional paid-in-capital	2,772,855	2,818,520
Accumulated distributions in excess of net income	(1,537,100)	(1,589,724)
Accumulated other comprehensive income	76	1,065
Total shareholders’ equity	1,329,871	1,323,901
Noncontrolling interests	16,807	16,934
Total equity	1,346,678	1,340,835
Total liabilities and equity	$ 2,953,840	$ 3,553,020

CONSOLIDATED BALANCE SHEETS (Pa

CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Assets:
Accumulated amortization on deferred expenses	$ 27,397	$ 35,072
Liabilities:
Accumulated accretion on deferred revenue	$ 17,606	$ 26,081
Equity:
Preferred shares, par value (usd per share)	$ 0.0001	$ 0.0001
Preferred shares, authorized shares (in shares)	100,000,000	100,000,000
Preferred shares, liquidation preference	$ 96,770	$ 96,770
Preferred shares, convertible preferred, shares issued (in shares)	1,935,400	1,935,400
Preferred shares, redeemable preferred, shares outstanding (in shares)	1,935,400	1,935,400
Common shares, par value (usd per share)	$ 0.0001	$ 0.0001
Common shares, authorized shares (in shares)	400,000,000	400,000,000
Common shares, shares issued (in shares)	235,008,554	240,689,081
Common shares, shares outstanding (in shares)	235,008,554	240,689,081

CONSOLIDATED STATEMENTS OF OPER

CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Gross revenues:
Rental	$ 364,731	$ 359,832	$ 398,065
Tenant reimbursements	30,608	31,809	31,431
Total gross revenues	395,339	391,641	429,496
Expense applicable to revenues:
Depreciation and amortization	(168,191)	(173,968)	(166,048)
General and administrative	(31,662)	(34,158)	(31,104)
Litigation settlement	0	(2,050)	0
Non-operating income	3,491	10,378	13,043
Interest and amortization expense	(79,880)	(77,883)	(88,032)
Debt satisfaction gains (charges), net	(2,596)	6,196	(975)
Impairment charges and loan losses	(95,813)	(44,996)	(100,236)
Gains on sales of properties	252,913	63,428	81,510
Income (loss) before provision for income taxes and equity in earnings of non-consolidated entities	230,926	89,394	90,299
Provision for income taxes	(1,728)	(1,917)	(1,439)
Equity in earnings (losses) of non-consolidated entities	1,708	(848)	7,590
Income (loss) from continuing operations	230,906	86,629	96,450
Less net income attributable to noncontrolling interests	(3,491)	(1,046)	(826)
Net income attributable to Lexington Realty Trust shareholders	227,415	85,583	95,624
Dividends attributable to preferred shares	(6,290)	(6,290)	(6,290)
Allocation to participating securities	(287)	(226)	(225)
Net income attributable to common shareholders	$ 220,838	$ 79,067	$ 89,109
Net income attributable to common shareholders - basic (usd per share)	$ 0.93	$ 0.33	$ 0.38
Weighted-average common shares outstanding - basic (in shares)	236,666,375	237,758,408	233,633,058
Net income attributable to common shareholders - diluted (usd per share)	$ 0.93	$ 0.33	$ 0.37
Weighted-average common shares outstanding - diluted (in shares)	240,810,990	241,537,837	237,679,031
Real Estate [Member]
Expense applicable to revenues:
Property operating	$ (42,675)	$ (49,194)	$ (47,355)

CONSOLIDATED STATEMENTS OF OP_2

CONSOLIDATED STATEMENTS OF OPERATIONS (Parentheticals)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Statement [Abstract]
Preferred dividend rate	6.50%	6.50%	6.50%

CONSOLIDATED STATEMENTS OF COMP

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Statement of Comprehensive Income [Abstract]
Net Income	$ 230,906	$ 86,629	$ 96,450
Other comprehensive income (loss):
Change in unrealized gain (loss) on interest rate swaps, net	(989)	2,098	906
Other comprehensive income (loss)	(989)	2,098	906
Comprehensive income	229,917	88,727	97,356
Comprehensive income attributable to noncontrolling interests	(3,491)	(1,046)	(826)
Comprehensive income attributable to Lexington Realty Trust shareholders	$ 226,426	$ 87,681	$ 96,530

CONSOLIDATED STATEMENT OF CHANG

CONSOLIDATED STATEMENT OF CHANGES IN EQUITY - USD ($) $ in Thousands	Total	Preferred Shares [Member]	Common Shares [Member]	Additional Paid-in-Capital [Member]	Accumulated Distributions in Excess of Net Income [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Noncontrolling Interests [Member]
Balance at beginning of period at Dec. 31, 2015	$ 1,462,531	$ 94,016	$ 23	$ 2,776,837	$ (1,428,908)	$ (1,939)	$ 22,502
Beginning balance (in shares) at Dec. 31, 2015		1,935,400	234,575,225
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Redemption of noncontrolling OP units for common shares				210			(210)
Redemption of noncontrolling OP units for common shares (in shares)			48,549
Repurchase of common shares	(8,973)			(8,973)
Repurchase of common shares (in shares)			(1,184,113)
Issuance of common shares upon conversion of convertible notes	12,027			12,027
Issuance of common shares upon conversion of convertible notes (in shares)			1,892,269
Exercise of employee common share options	(1,101)			(1,101)
Exercise of employee common share options, net (in shares)			170,412
Issuance of common shares and deferred compensation amortization, net	21,737		$ 1	21,736
Issuance of common shares and deferred compensation amortization, net (in shares)			2,534,835
Dividends/distributions	(171,086)				(167,682)		(3,404)
Net Income	96,450				95,624		826
Other comprehensive income (loss)	906					906
Balance at end of period at Dec. 31, 2016	1,412,491	$ 94,016	$ 24	2,800,736	(1,500,966)	(1,033)	19,714
Ending balance (in shares) at Dec. 31, 2016		1,935,400	238,037,177
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Redemption of noncontrolling OP units for common shares	0			584			(584)
Redemption of noncontrolling OP units for common shares (in shares)			140,746
Exercise of employee common share options	478			478
Exercise of employee common share options, net (in shares)			151,106
Issuance of common shares and deferred compensation amortization, net	24,673			24,673
Issuance of common shares and deferred compensation amortization, net (in shares)			2,360,052
Acquisition of consolidated joint venture partner's equity interest	(7,951)			(7,951)
Dividends/distributions	(177,583)				(174,341)		(3,242)
Net Income	86,629				85,583		1,046
Other comprehensive income (loss)	2,098					2,098
Balance at end of period at Dec. 31, 2017	1,340,835	$ 94,016	$ 24	2,818,520	(1,589,724)	1,065	16,934
Ending balance (in shares) at Dec. 31, 2017		1,935,400	240,689,081
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Redemption of noncontrolling OP units for common shares	0			189			(189)
Redemption of noncontrolling OP units for common shares (in shares)			53,388
Repurchase of common shares	(49,858)			(49,858)
Repurchase of common shares (in shares)			(5,851,252)
Exercise of employee common share options	115			115
Exercise of employee common share options, net (in shares)			16,390
Issuance of common shares and deferred compensation amortization, net	6,520			6,520
Issuance of common shares and deferred compensation amortization, net (in shares)			966,791
Repurchase of common shares to settle tax obligations	(2,544)			(2,544)
Repurchase of common shares to settle tax obligations (in shares)			(271,792)
Forfeiture of employee common shares	(71)			(87)	16
Forfeiture of employee common shares (in shares)			(594,052)
Dividends/distributions	(178,236)				(174,807)		(3,429)
Net Income	230,906				227,415		3,491
Other comprehensive income (loss)	(989)					(989)
Balance at end of period at Dec. 31, 2018	$ 1,346,678	$ 94,016	$ 24	$ 2,772,855	$ (1,537,100)	$ 76	$ 16,807
Ending balance (in shares) at Dec. 31, 2018		1,935,400	235,008,554

CONSOLIDATED STATEMENTS OF CASH

CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Cash flows from operating activities:
Net income	$ 230,906	$ 86,629	$ 96,450
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	172,088	177,561	170,038
Gains on sales of properties	(252,913)	(63,428)	(81,510)
Debt satisfaction (gains) charges, net	2,596	(6,196)	975
Impairment charges and loan losses	95,813	44,996	100,236
Straight-line rents	(20,207)	(19,568)	(37,445)
Other non-cash (income) expense, net	(3,060)	8,093	1,656
Equity in (earnings) losses of non-consolidated entities	(1,708)	848	(7,590)
Distributions of accumulated earnings from non-consolidated entities	2,083	403	815
Unearned contingent acquisition consideration	0	(3,922)	0
Deferred taxes, net	0	0	59
Change in accounts payable and other liabilities	(129)	(1,141)	(1,657)
Change in rent receivable and prepaid rent, net	(3,942)	2,922	(1,825)
Change in accrued interest payable	(891)	16	808
Other adjustments, net	(2,825)	657	(1,200)
Net cash provided by operating activities:	217,811	227,870	239,810
Cash flows from investing activities:
Investment in real estate, including intangible assets	(315,959)	(558,571)	(167,797)
Investment in real estate under construction	0	(83,274)	(132,192)
Capital expenditures	(15,506)	(15,184)	(4,408)
Net proceeds from sale of properties	898,514	223,853	370,038
Net proceeds from sale of non-consolidated investment	0	6,127	0
Principal payments received on loans receivable	0	139,042	2,214
Investments in and advances to non-consolidated entities, net	(10,206)	(9,898)	(37,240)
Distributions from non-consolidated entities in excess of accumulated earnings	3,330	531	8,175
Payments of deferred leasing costs	(4,522)	(6,526)	(6,558)
Change in real estate deposits	(760)	20,826	(20,848)
Net cash provided by (used in) investing activities	554,891	(283,074)	11,384
Cash flows from financing activities:
Dividends to common and preferred shareholders	(175,537)	(172,101)	(165,858)
Conversion of convertible notes	0	0	(672)
Principal amortization payments	(29,666)	(30,082)	(26,796)
Principal payments on debt, excluding normal amortization	(14,599)	(50,797)	(109,973)
Proceeds of mortgages and notes payable	26,350	45,400	254,650
Term loan payments	(300,000)	0	0
Proceeds from term loans	0	95,000	0
Revolving credit facility borrowings	150,000	270,000	95,000
Revolving credit facility payments	(310,000)	(110,000)	(272,000)
Payment of early extinguishment of debt charges	(5)	(1,326)	(5,603)
Payment of developer liabilities	0	0	(4,016)
Payments of deferred financing costs	(690)	(2,124)	(1,842)
Cash distributions to noncontrolling interests	(3,429)	(3,242)	(3,404)
Redemption of a noncontrolling interest	0	(7,951)	0
Repurchase of common shares	(47,217)	0	(8,973)
Issuance of common shares, net of costs and repurchases to settle tax obligations	(2,818)	16,804	12,186
Net cash provided by (used in) financing activities	(707,611)	49,581	(237,301)
Change in cash, cash equivalents and restricted cash	65,091	(5,623)	13,893
Cash, cash equivalents and restricted cash, at beginning of year	112,156	117,779	103,886
Cash, cash equivalents and restricted cash, at end of year	$ 177,247	$ 112,156	$ 117,779

The Company

The Company	12 Months Ended
	Dec. 31, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract]
The Company	The Company Lexington Realty Trust (together with its consolidated subsidiaries, except when the context only applies to the parent entity, the “Company”) is a Maryland statutory real estate investment trust (“REIT”) that owns a diversified portfolio of equity investments in single-tenant commercial properties. As of December 31, 2018 , the Company had equity ownership interests in approximately 135 consolidated properties located in 34 states. The properties in which the Company has an interest are primarily net-leased to tenants in various industries. The Company believes it has qualified as a REIT under the Internal Revenue Code of 1986, as amended (the “Code”). Accordingly, the Company will not be subject to federal income tax, provided that distributions to its shareholders equal at least the amount of its REIT taxable income as defined under the Code. The Company is permitted to participate in certain activities from which it was previously precluded in order to maintain its qualification as a REIT, so long as these activities are conducted in entities which elect to be treated as taxable REIT subsidiaries (“TRS”) under the Code. As such, the TRS are subject to federal income taxes on the income from these activities. The Company conducts its operations either directly or indirectly through (1) property owner subsidiaries and lender subsidiaries, which are single purpose entities, (2) an operating partnership, Lepercq Corporate Income Fund L.P. (“LCIF”), in which the Company is the sole unit holder of the general partner and the sole unit holder of the limited partner that holds a majority of the limited partner interests, (3) a wholly-owned TRS, Lexington Realty Advisors, Inc. (“LRA”), and (4) investments in joint ventures. References to “OP Units” refer to units of limited partner interests in LCIF. Property owner subsidiaries are landlords under leases for properties in which the Company has an interest and/or borrowers under loan agreements secured by properties in which the Company has an interest and lender subsidiaries are lenders under loan agreements where the Company made an investment in a loan asset, but in all cases are separate and distinct legal entities. Each property owner subsidiary is a separate legal entity that maintains separate books and records. The assets and credit of each property owner subsidiary with a property subject to a mortgage loan are not available to creditors to satisfy the debt and other obligations of any other person, including any other property owner subsidiary or any other affiliate. Consolidated entities that are not property owner subsidiaries do not directly own any of the assets of a property owner subsidiary (or the general partner, member or managing member of such property owner subsidiary), but merely hold partnership, membership or beneficial interest therein, which interests are subordinate to the claims of such property owner subsidiary's (or its general partner's, member's or managing member's) creditors.

Summary of Significant Accounti

Summary of Significant Accounting Policies	12 Months Ended
	Dec. 31, 2018
Accounting Policies [Abstract]
Summary of Significant Accounting Policies	Summary of Significant Accounting Policies Basis of Presentation and Consolidation. The Company's consolidated financial statements are prepared on the accrual basis of accounting in accordance with U.S. generally accepted accounting principles (“GAAP”). The financial statements reflect the accounts of the Company and its consolidated subsidiaries. The Company consolidates its wholly-owned subsidiaries, partnerships and joint ventures which it controls (i) through voting rights or similar rights or (ii) by means other than voting rights if the Company is the primary beneficiary of a variable interest entity ("VIE"). Entities which the Company does not control and entities which are VIEs in which the Company is not the primary beneficiary are accounted for under appropriate GAAP. The Company is the primary beneficiary of certain VIEs as it has a controlling financial interest in these entities. LCIF, which is consolidated and in which the Company has an approximate 96% interest, is a VIE. The Company had a joint venture limited partnership that owned the Lake Jackson, Texas property, with a developer which was a consolidated VIE. In 2017, upon the closeout of the build-to-suit project, the developer earned notional capital of $7,951 , which was simultaneously redeemed by the limited partnership for $7,951 . The Company treated the payment as a reduction in shareholders equity in accordance with ASC 810-10-45-23. As a result, the limited partnership, which is still consolidated, is wholly-owned by the Company and no longer a VIE. The assets of each VIE are only available to satisfy such VIE's respective liabilities. As of December 31, 2018 and 2017 , the VIEs' mortgages and notes payable were non-recourse to the Company. Below is a summary of selected financial data of consolidated VIEs for which the Company is the primary beneficiary included in the Consolidated Balance Sheets as of December 31, 2018 and 2017 : December 31, 2018 December 31, 2017 Real estate, net $ 509,916 $ 682,587 Total assets $ 607,963 $ 766,025 Mortgages and notes payable, net $ 192,791 $ 212,792 Total liabilities $ 203,322 $ 226,331 In addition, the Company acquires, from time to time, properties using a reverse like-kind exchange structure pursuant to Section 1031 of the Internal Revenue Code (a "reverse 1031 exchange") and, as such, the properties are in the possession of an Exchange Accommodation Titleholder ("EAT") until the reverse 1031 exchange is completed. The EAT is classified as a VIE as it is a “thinly capitalized” entity. The Company consolidates the EAT because it is the primary beneficiary as it has the ability to control the activities that most significantly impact the EAT's economic performance and can collapse the reverse 1031 exchange structure at any time. The assets of the EAT primarily consist of leased property (net real estate and intangibles). Earnings Per Share . Basic net income (loss) per share is computed by dividing net income (loss) reduced by preferred dividends and amounts allocated to certain non-vested share-based payment awards, if applicable, by the weighted-average number of common shares outstanding during the period. Diluted net income (loss) per share amounts are similarly computed but include the effect, when dilutive, of in-the-money common share options and non-vested common shares, OP units and put options of certain convertible securities. Use of Estimates. Management has made a number of significant estimates and assumptions relating to the reporting of assets and liabilities, the disclosure of contingent assets and liabilities and the reported amounts of revenues and expenses to prepare these consolidated financial statements in conformity with GAAP. These estimates and assumptions are based on management's best estimates and judgment. Management evaluates its estimates and assumptions on an ongoing basis using historical experience and other factors, including the economic environment. Management adjusts such estimates when facts and circumstances dictate. The most significant estimates made include the recoverability of accounts receivable, allocation of property purchase price to tangible and intangible assets acquired and liabilities assumed, the determination of VIEs and which entities should be consolidated, the determination of impairment of long-lived assets and equity method investments, valuation of derivative financial instruments, valuation of awards granted under compensation plans and the useful lives of long-lived assets. Actual results could differ materially from those estimates. Fair Value Measurements. The Company follows the guidance in the Financial Accounting Standards Board ("FASB") Accounting Standards Codification ("ASC") Topic 820, Fair Value Measurements and Disclosures ("Topic 820"), to determine the fair value of financial and non-financial instruments. Topic 820 defines fair value, establishes a framework for measuring fair value in GAAP and expands disclosures about fair value measurements. Topic 820 establishes a fair value hierarchy that prioritizes observable and unobservable inputs used to measure fair value into three levels: Level 1 - quoted prices (unadjusted) in active markets that are accessible at the measurement date for assets or liabilities; Level 2 - observable prices that are based on inputs not quoted in active markets, but corroborated by market data; and Level 3 - unobservable inputs, which are used when little or no market data is available. The fair value hierarchy gives the highest priority to Level 1 inputs and the lowest priority to Level 3 inputs. In determining fair value, the Company utilizes valuation techniques that maximize the use of observable inputs and minimize the use of unobservable inputs to the extent possible, as well as considering counterparty credit risk. The Company has formally elected to apply the portfolio exception within Topic 820 with respect to measuring counterparty risk for all of its derivative transactions subject to master netting arrangements. Revenue Recognition. The Company recognizes lease revenue on a straight-line basis over the term of the lease unless another systematic and rational basis is more representative of the time pattern in which the use benefit is derived from the leased property. Revenue is recognized on a contractual basis for leases with escalations tied to a consumer price index with no floor. Renewal options in leases with rental terms that are lower than those in the primary term are excluded from the calculation of straight-line rent if the renewals are not reasonably assured. If the Company funds tenant improvements and the improvements are deemed to be owned by the Company, revenue recognition will commence when the improvements are substantially completed and possession or control of the space is turned over to the tenant. If the Company determines that the tenant allowances are lease incentives, the Company commences revenue recognition when possession or control of the space is turned over to the tenant for tenant work to begin. The lease incentive is recorded as a deferred expense and amortized as a reduction of revenue on a straight-line basis over the respective lease term. The Company recognizes lease termination fees as rental revenue in the period received and writes off unamortized lease-related intangible and other lease-related account balances, provided there are no further Company obligations under the lease. Otherwise, such fees and balances are recognized on a straight-line basis over the remaining obligation period with the termination payments being recorded as a component of rent receivable-deferred on the Consolidated Balance Sheets. Acquisition of Real Estate. The fair value of the real estate acquired, which includes the impact of fair value adjustments for assumed mortgage debt related to property acquisitions, is allocated to the acquired tangible assets, consisting of land, building and improvements and identified intangible assets and liabilities, consisting of the value of above-market and below-market leases, other value of in-place leases and value of tenant relationships, based in each case on their fair values. Prior to January 1, 2018, acquisition and pursuit costs were expensed as incurred and were included in property operating expense in the accompanying Consolidated Statement of Operations, which were $2,171 and $836 for 2017 and 2016, respectively. Effective January 1, 2018, the Company's acquisitions are primarily considered asset acquisitions and acquisition costs are now capitalized. The fair value of the tangible assets of an acquired property (which includes land, building and improvements and fixtures and equipment) is determined by valuing the property as if it were vacant. The “as-if-vacant” value is then allocated to land and building and improvements based on management's determination of relative fair values of these assets. Factors considered by management in performing these analyses include an estimate of carrying costs during the expected lease-up periods considering current market conditions and costs to execute similar leases. In estimating carrying costs, management includes real estate taxes, insurance and other operating expenses and estimates of lost rental revenue during the expected lease-up periods based on current market demand. Management also estimates costs to execute similar leases including leasing commissions. Management generally retains a third party to assist in the allocations. In allocating the fair value of the identified intangible assets and liabilities of an acquired property, above-market and below-market lease values are recorded based on the difference between the current in-place lease rent and management's estimate of current market rents. Below-market lease intangibles are recorded as part of deferred revenue and amortized into rental revenue over the non-cancelable periods and bargain renewal periods of the respective leases. Above-market leases are recorded as part of intangible assets and amortized as a direct charge against rental revenue over the non-cancelable portion of the respective leases. The aggregate value of other acquired intangible assets, consisting of in-place leases and tenant relationship values, is measured by the excess of (1) the purchase price paid for a property over (2) the estimated fair value of the property as if vacant, determined as set forth above. This aggregate value is allocated between in-place lease values and tenant relationship values based on management's evaluation of the specific characteristics of each tenant's lease. The value of in-place leases is amortized to expense over the remaining non-cancelable periods and any bargain renewal periods of the respective leases. The value of tenant relationships is amortized to expense over the applicable lease term plus expected renewal periods. Depreciation is determined by the straight-line method over the remaining estimated economic useful lives of the properties. The Company generally depreciates its real estate assets over periods ranging up to 40 years. Impairment of Real Estate. The Company evaluates the carrying value of all tangible and intangible real estate assets held for investment for possible impairment when an event or change in circumstance has occurred that indicates its carrying value may not be recoverable. The evaluation includes estimating and reviewing anticipated future undiscounted cash flows to be derived from the asset. If such cash flows are less than the asset's carrying value, an impairment charge is recognized to the extent by which the asset's carrying value exceeds its estimated fair value, which may be below the balance of any non-recourse financing. Estimating future cash flows and fair values is highly subjective and such estimates could differ materially from actual results. Investments in Non-Consolidated Entities . The Company accounts for its investments in 50% or less owned entities under the equity method, unless consolidation is required. If the Company's investment in the entity is insignificant and the Company has no influence over the control of the entity then the entity is accounted for under the cost method. Impairment of Equity Method Investments. The Company assesses whether there are indicators that the value of its equity method investments may be impaired. An impairment charge is recognized only if the Company determines that a decline in the value of the investment below its carrying value is other-than-temporary. The assessment of impairment is highly subjective and involves the application of significant assumptions and judgments about the Company's intent and ability to recover its investment given the nature and operations of the underlying investment, including the level of the Company's involvement therein, among other factors. To the extent an impairment is deemed to be other-than-temporary, the loss is measured as the excess of the carrying amount of the investment over the estimated fair value of the investment. Acquisition, Development and Construction Arrangements. The Company evaluates loans receivable where the Company participates in residual profits through loan provisions or other contracts to ascertain whether the Company has the same risks and rewards as an owner or a joint venture partner. Where the Company concludes that such arrangements are more appropriately treated as an investment in real estate, the Company reflects such loan receivable as an equity investment in real estate under construction in the Consolidated Balance Sheets. In these cases, no interest income is recorded on the loan receivable and the Company records capitalized interest during the construction period. In arrangements where the Company engages a developer to construct a property or provide funds to a tenant to develop a property, the Company will capitalize the funds provided to the developer/tenant and internal costs of interest and real estate taxes, if applicable, during the construction period. Properties Held For Sale. Assets and liabilities of properties that meet various held for sale criteria, including whether it is probable that a sale will occur within 12 months, are presented separately in the Consolidated Balance Sheets. The operating results of these properties are reflected as discontinued operations in the Consolidated Statements of Operations only if the sale of these assets represents a strategic shift in operations; if not, the operating results are included in continuing operations. Properties classified as held for sale are carried at the lower of net carrying value or estimated fair value less costs to sell and depreciation and amortization are no longer recognized. Properties that do not meet the held for sale criteria are accounted for as operating properties. Deferred Expenses. Deferred expenses consist primarily of revolving line of credit debt and leasing costs. Debt costs are amortized using the straight-line method, which approximates the interest method, over the terms of the debt instruments and leasing costs are amortized over the term of the related lease. Derivative Financial Instruments . The Company accounts for its interest rate swap agreements in accordance with FASB ASC Topic 815, Derivatives and Hedging ("Topic 815"). In accordance with Topic 815, these agreements are carried on the balance sheet at their respective fair values, as an asset if fair value is positive, or as a liability if fair value is negative. If the interest rate swap is designated as a cash flow hedge, the effective portion of the interest rate swap's change in fair value is reported as a component of other comprehensive income (loss); the ineffective portion, if any, is recognized in earnings as an increase or decrease to interest expense. Upon entering into hedging transactions, the Company documents the relationship between the interest rate swap agreement and the hedged item. The Company also documents its risk-management policies, including objectives and strategies, as they relate to its hedging activities. The Company assesses, both at inception of a hedge and on an ongoing basis, whether or not the hedge is highly effective. The Company will discontinue hedge accounting on a prospective basis with changes in the estimated fair value reflected in earnings when (1) it is determined that the derivative is no longer effective in offsetting cash flows of a hedged item (including forecasted transactions), (2) it is no longer probable that the forecasted transaction will occur or (3) it is determined that designating the derivative as an interest rate swap is no longer appropriate. The Company does and may continue to utilize interest rate swap and cap agreements to manage interest rate risk, but does not anticipate entering into derivative transactions for speculative trading purposes. Stock Compensation. The Company maintains an equity participation plan. Non-vested share grants generally vest either based upon (1) time, (2) performance and/or (3) market conditions. Options granted under the plan in 2010 vested over a five -year period and expire ten years from the date of grant. Options granted under the plan in 2008 vested upon attainment of certain market performance measures and expired ten years from the date of grant. All share-based payments to employees, including grants of employee stock options, are recognized in the Consolidated Statements of Operations based on their fair values. The Company has made an accounting policy election to account for share-based award forfeitures in compensation costs when they occur. Tax Status. The Company has made an election to qualify, and believes it is operating so as to qualify, as a REIT for federal income tax purposes. Accordingly, the Company generally will not be subject to federal income tax, provided that distributions to its shareholders equal at least the amount of its REIT taxable income as defined under Sections 856 through 860 of the Code. The Company is permitted to participate in certain activities from which it was previously precluded in order to maintain its qualification as a REIT, so long as these activities are conducted in entities which elect to be treated as taxable REIT subsidiaries under the Code. As such, the Company is subject to federal and state income taxes on the income from these activities. Income taxes, primarily related to the Company's taxable REIT subsidiaries, are accounted for under the asset and liability method. Deferred tax assets and liabilities are recognized for the estimated future tax consequences attributable to differences between the financial statement carrying amounts of existing assets and liabilities and their respective tax basis and operating loss and tax credit carry-forwards. Deferred tax assets and liabilities are measured using enacted tax rates in effect for the year in which those temporary differences are expected to be recovered or settled. Cash and Cash Equivalents. The Company considers all highly liquid instruments with maturities of three months or less from the date of purchase to be cash equivalents. Restricted Cash. Restricted cash is comprised primarily of cash balances held in escrow by lenders. Environmental Matters. Under various federal, state and local environmental laws, statutes, ordinances, rules and regulations, an owner of real property may be liable for the costs of removal or remediation of certain hazardous or toxic substances at, on, in or under such property as well as certain other potential costs relating to hazardous or toxic substances. These liabilities may include government fines, penalties and damages for injuries to persons and adjacent property. Such laws often impose liability without regard to whether the owner knew of, or was responsible for, the presence or disposal of such substances. Although most of the tenants of properties in which the Company has an interest are primarily responsible for any environmental damage and claims related to the leased premises, in the event of the bankruptcy or inability of the tenant of such premises to satisfy any obligations with respect to such environmental liability, or if the tenant is not responsible, the Company's property owner subsidiary may be required to satisfy any such obligations, should they exist. In addition, the property owner subsidiary, as the owner of such a property, may be held directly liable for any such damages or claims irrespective of the provisions of any lease. As of December 31, 2018 , the Company was not aware of any environmental matter relating to any of its investments that would have a material impact on the consolidated financial statements. Segment Reporting. The Company operates generally in one industry segment, single-tenant real estate assets. Reclassifications . Certain amounts included in prior years' financial statements have been reclassified to conform to the current year's presentation. New Accounting Standards Adopted in 2018. In August 2016, the FASB issued ASU 2016-15, Statement of Cash Flows (Topic 230): Classification of Certain Cash Receipts and Cash Payments, which addresses how certain cash receipts and cash payments are presented and classified in the statement of cash flows. In November 2016, the FASB issued ASU 2016-18, Statement of Cash Flows (Topic 230): Restricted Cash, which clarifies guidance on the classification and presentation of changes in restricted cash. Restricted cash balances are now included along with cash and cash equivalents as of the end of the period and beginning of period, respectively, in the Company's consolidated statement of cash flows for all periods presented. In addition, separate line items showing changes in restricted cash balances are now eliminated from the Company's consolidated statement of cash flows. These ASUs were effective for fiscal years beginning after December 15, 2017, including interim periods within those years. Entities must apply the guidance retrospectively to all periods presented but may apply it prospectively if retrospective application would be impracticable. The Company adopted these ASUs effective January 1, 2018 on a retrospective basis. The effect of the adoption resulted in (1) a $109 and $4,537 change in cash flows from operating activities for 2017 and 2016, respectively, (2) a $(23,958) and $21,571 change in cash flows from investing activities for 2017 and 2016, respectively, and (3) a $(2,899) and $(5,603) change in cash flows from financing activities for 2017 and 2016, respectively. In January 2017, the FASB issued ASU 2017-01, Business Combinations (Topic 805): Clarifying the Definition of a Business, which clarifies the definition of a business when evaluating whether transactions should be accounted for as acquisitions (or disposals) of assets or businesses. The ASU was effective for reporting periods beginning after December 15, 2017. The Company expects that acquisitions of real estate or in-substance real estate will not meet the revised definition of a business and thus will be treated as asset acquisitions. Acquisition costs for those acquisitions that are not businesses will be capitalized rather than expensed. The Company adopted this guidance effective January 1, 2018 on a prospective basis. The Company's property acquisitions in 2018 were accounted for as asset acquisitions. The Company's adoption of this guidance did not have a material impact on its consolidated financial statements. In May 2014, the FASB issued ASU 2014-09, Revenue from Contracts with Customers (Topic 606), as subsequently amended, which amends the guidance for revenue recognition to eliminate the industry-specific revenue recognition guidance and replace it with a principle based approach for determining revenue recognition. The new guidance was effective for reporting periods beginning after December 15, 2017. The Company’s revenue-producing contracts are primarily leases that are not within the scope of this standard as leases are excluded from ASU 2014-09. Under ASU 2014-09, revenue recognition for real estate sales is largely based on the transfer of control and the buyer having the ability to direct the use of, or obtain substantially all of the remaining benefit from, the asset (which generally will occur on the closing date); the factor of continuing involvement is no longer a specific consideration for the timing of recognition. The Company adopted ASU 2014-09 effective January 1, 2018 using the modified retrospective approach. As the majority of the Company’s revenue is from rental income related to leases, the adoption of the ASU did not have a material impact on its consolidated financial statements. In February 2017, the FASB issued ASU 2017-05, Other Income - Gains and Losses from the Derecognition of Nonfinancial Assets (Topic 610-20), which requires that all entities account for the derecognition of a business in accordance with ASC 810, including instances in which the business is considered in-substance real estate. The ASU requires the Company to measure at fair value any retained interest in a partial sale of real estate. The Company adopted ASU 2017-05 effective January 1, 2018 using the modified retrospective approach, however there was no impact to prior balances as there were no open contracts at the date of adoption. During 2018, the Company entered into a transaction in which it contributed consolidated properties to a newly-formed joint venture and acquired a 20% interest in the joint venture. See note 7. Recently Issued Accounting Guidance. In February 2016, the FASB issued ASU 2016-02, Leases (Topic 842), which requires lessees to recognize a right of use asset and related lease liability for those leases classified as operating leases at the commencement date that have lease terms of more than 12 months and amends certain lessor guidance. The Company expects the ASU to result in the recognition of a right-of-use asset and related liability to primarily account for the Company's future obligations under its ground lease arrangements for which the Company is the lessee. The Company estimates that its initial right-of-use asset and lease liability will be within a range of $35,000 to $45,000 at adoption. From a lessor perspective, the Company expects that lease components will primarily be recognized on a straight-line basis over the lease term. ASU 2016-02 originally stated that companies would be required to bifurcate certain lease revenues between lease and non-lease components; however, the FASB issued ASU 2018-11, Leases (Topic 842): Targeted Improvements in July 2018, which allows lessors a practical expedient by class of underlying assets to account for lease and non-lease components as a single lease component if certain criteria are met. Additionally, ASU 2016-02 requires that the Company capitalize, as initial direct costs, only those costs that are incurred due to the execution of a lease. Historically, the Company has capitalized lease commissions and "other" lease related costs, primarily legal expenses. Effective January 1, 2019, the Company will not capitalize these "other" costs, however, the Company does not believe these will be material. ASU 2016-02 is effective for fiscal years beginning after December 15, 2018, and interim periods within those years. ASU 2016-02 originally required a modified retrospective method of adoption; however, under ASU 2018-11 companies may elect to recognize a cumulative-effect adjustment to the opening balance of retained earnings in the period of adoption. The Company will adopt this new guidance on January 1, 2019 utilizing the cumulative-effect adjustment outlined in ASU 2018-11. In addition, the Company will elect several practical expedients afforded to it at implementation. In August 2017, the FASB issued ASU-2017-12, Derivatives and Hedging (Topic 815): Targeted Improvements to Accounting for Hedging Activities, which amends the hedge accounting recognition and presentation requirements in Topic 815. The adoption of this guidance on January 1, 2019 did not have a material impact on the Company's consolidated financial statements.

Earnings Per Share

Earnings Per Share	12 Months Ended
	Dec. 31, 2018
Earnings Per Share [Abstract]
Earnings Per Share	Earnings Per Share A significant portion of the Company's non-vested share-based payment awards are considered participating securities and as such, the Company is required to use the two-class method for the computation of basic and diluted earnings per share. Under the two-class computation method, net losses are not allocated to participating securities unless the holder of the security has a contractual obligation to share in the losses. The non-vested share-based payment awards are not allocated losses as the awards do not have a contractual obligation to share in losses of the Company. The following is a reconciliation of the numerators and denominators of the basic and diluted earnings per share computations for each of the years in the three-year period ended December 31, 2018 : 2018 2017 2016 BASIC Net income attributable to common shareholders $ 220,838 $ 79,067 $ 89,109 Weighted-average number of common shares outstanding 236,666,375 237,758,408 233,633,058 Net income attributable to common shareholders - per common share basic $ 0.93 $ 0.33 $ 0.38 DILUTED: Net income attributable to common shareholders - basic $ 220,838 $ 79,067 $ 89,109 Impact of assumed conversions 2,528 147 (159 ) Net income attributable to common shareholders $ 223,366 $ 79,214 $ 88,950 Weighted-average common shares outstanding - basic 236,666,375 237,758,408 233,633,058 Effect of dilutive securities: Unvested share-based payment awards and options 528,495 86,285 230,352 Operating Partnership Units 3,616,120 3,693,144 3,815,621 Weighted-average common shares outstanding - diluted 240,810,990 241,537,837 237,679,031 Net income attributable to common shareholders - per common share diluted $ 0.93 $ 0.33 $ 0.37 For per common share amounts, all incremental shares are considered anti-dilutive for periods that have a loss from continuing operations attributable to common shareholders. In addition, other common share equivalents may be anti-dilutive in certain periods.

Investments in Real Estate

Investments in Real Estate	12 Months Ended
	Dec. 31, 2018
Real Estate Investments, Net [Abstract]
Investments in Real Estate	Investments in Real Estate The Company's real estate, net, consists of the following at December 31, 2018 and 2017 : 2018 2017 Real estate, at cost: Buildings and building improvements $ 2,746,446 $ 3,476,022 Land, land estates and land improvements 341,848 456,134 Fixtures and equipment — 84 Construction in progress 1,840 4,219 Real estate intangibles: In-place lease values 331,607 461,624 Tenant relationships 54,662 97,223 Above-market leases 33,343 40,244 3,509,746 4,535,550 Accumulated depreciation and amortization (1) (954,087 ) (1,225,650 ) Real estate, net $ 2,555,659 $ 3,309,900 (1) Includes accumulated amortization of real estate intangible assets of $231,443 and $334,681 in 2018 and 2017 , respectively. The estimated amortization of the above real estate intangible assets for the next five years is $24,021 in 2019 , $21,442 in 2020 , $19,501 in 2021 , $17,448 in 2022 and $17,065 in 2023 . The Company had below-market leases, net of accumulated accretion, which are included in deferred revenue, of $ 17,923 and $ 23,308 , respectively, as of December 31, 2018 and 2017 . The estimated accretion for the next five years is $ 2,144 in 2019 , $ 2,118 in 2020 , $ 1,778 in 2021 , $ 1,499 in 2022 and $ 1,499 in 2023 . The Company completed the following acquisitions and build-to-suit transactions during 2018 and 2017 : 2018 : Real Estate Intangibles Property Type Location Acquisition Date Initial Cost Basis Lease Expiration Land and Land Estate Building and Improvements Lease in-place Value Intangible Below Market Lease Intangible Industrial Olive Branch, MS April 2018 $ 44,090 07/2029 $ 1,958 $ 38,687 $ 3,445 $ — Industrial Olive Branch, MS April 2018 48,575 06/2021 2,500 42,538 5,151 (1,614 ) Industrial Edwardsville, IL June 2018 44,178 05/2030 3,649 41,292 3,467 (4,230 ) Industrial Spartanburg, SC August 2018 27,632 07/2024 1,447 23,744 2,441 — Industrial Pasadena, TX August 2018 23,868 08/2023 4,057 17,810 2,001 — Industrial Carrollton, TX September 2018 19,564 12/2033 3,228 15,766 1,247 (677 ) Industrial Goodyear, AZ November 2018 41,372 04/2026 5,247 36,115 2,014 (2,004 ) Industrial Chester, VA December 2018 66,311 06/2030 8,544 53,067 6,832 (2,132 ) $ 315,590 $ 30,630 $ 269,019 $ 26,598 $ (10,657 ) Weighted-average life of intangible assets (years) 8.4 9.4 In addition, the Company acquired a 57 -acre parcel of land from a non-consolidated joint venture and leased the parcel to a tenant to develop an industrial property. 2017 : Real Estate Intangibles Property Type Location Acquisition Date Initial Lease Expiration Land and Land Estate Building and Improvements Lease in-place Value Intangible Below Market Lease Intangible Office Lake Jackson, TX (1) January 2017 $ 70,401 10/2036 $ 3,078 $ 67,323 $ — $ — Industrial New Century, KS February 2017 12,056 01/2027 — 13,198 1,648 (2,790 ) Industrial Lebanon, IN February 2017 36,194 01/2024 2,100 29,443 4,651 — Office Charlotte, NC (2) April 2017 61,339 04/2032 3,771 47,064 10,504 — Industrial Cleveland, TN May 2017 34,400 03/2024 1,871 29,743 2,786 — Industrial Grand Prairie, TX June 2017 24,317 03/2037 3,166 17,985 3,166 — Industrial San Antonio, TX June 2017 45,507 04/2027 1,311 36,644 7,552 — Industrial Opelika, AL July 2017 37,269 05/2042 134 33,183 3,952 — Industrial McDonough, GA August 2017 66,700 01/2028 5,441 52,762 8,497 — Industrial Byhalia, MS September 2017 36,590 09/2027 1,751 31,236 3,603 — Industrial Jackson, TN September 2017 57,920 10/2027 1,454 49,026 7,440 — Industrial Smyrna, TN September 2017 104,890 04/2027 1,793 93,940 9,157 — Industrial Lafayette, IN October 2017 17,450 09/2024 662 15,578 1,210 — Industrial Romulus, MI November 2017 38,893 08/2032 2,438 33,786 2,669 — Industrial Warren, MI November 2017 46,955 10/2032 972 42,521 3,462 — Industrial Winchester, VA December 2017 36,700 12/2031 1,988 32,501 2,211 — $ 727,581 $ 31,930 $ 625,933 $ 72,508 $ (2,790 ) Weighted-average life of intangible assets (years) 12.2 14.9 (1) Completed the construction of the final building of a four -building project. Initial cost basis excludes developer partner payout of $7,951 . (2) Sold to newly-formed joint venture in 2018. See note 7. From time to time, the Company is engaged in various forms of build-to-suit development activities. As of December 31, 2018 and 2017, the Company had no development arrangements outstanding. During 2017, the Company recognized $3,922 in non-operating income on the Company's Consolidated Statement of Operations due to the write-off of contingent consideration relating to a 2015 build-to-suit project that was not required to be paid by the Company.

Dispositions and Impairment

Dispositions and Impairment	12 Months Ended
	Dec. 31, 2018
Discontinued Operations and Disposal Groups [Abstract]
Dispositions and Impairment	Dispositions and Impairment For the years ended December 31, 2018 , 2017 and 2016 , the Company disposed of its interests in certain properties generating aggregate net proceeds of $898,514 , $223,853 and $370,038 , respectively, which resulted in gains on sales of $252,913 , $63,428 and $81,510 , respectively, including, in 2018, the disposition of 21 office assets to a newly-formed joint venture, NNN Office JV L.P. (“NNN JV”), with an unaffiliated third-party. See note 7. For the years ended December 31, 2018 , 2017 and 2016 , the Company recognized net debt satisfaction gains (charges) relating to properties sold of $(1,698) , $5,938 and $(532) , respectively. The Company had two properties classified as held for sale at December 31, 2018 and one property classified as held for sale at December 31, 2017 . Assets and liabilities of held for sale properties as of December 31, 2018 and 2017 consisted of the following: December 31, 2018 December 31, 2017 Assets: Real estate, at cost $ 63,639 $ 2,827 Real estate, intangible assets 14,498 — Accumulated depreciation and amortization (16,873 ) — Rent receivable - deferred 2,439 — Other 165 — $ 63,868 $ 2,827 Liabilities: Other $ 386 $ — $ 386 $ — The Company assesses on a regular basis whether there are any indicators that the carrying value of real estate assets may be impaired. Potential indicators may include an increase in vacancy at a property, tenant financial instability, change in the estimated holding period of an asset and the potential sale of the property in the near future. An asset is determined to be impaired if the asset's carrying value is in excess of its estimated fair value and the Company estimates that its cost will not be recovered. During 2018 , 2017 and 2016 , the Company recognized aggregate impairment charges on real estate properties of $95,813 , $39,702 and $100,195 , respectively. During 2018 , $36,620 of the impairment charges of $95,813 were recognized on properties owned at December 31, 2018. The Company's office assets in Overland Park, Kansas and Kansas City, Missouri incurred an aggregate $23,496 of impairment charges due to a reduction in the anticipated holding period and leasing prospects. During 2017 , $18,023 of the impairment charges of $39,702 were recognized on properties held at December 31, 2017. The Company's office asset in Florence, South Carolina and industrial asset in Memphis, Tennessee incurred an aggregate $15,008 of the impairment charges due to a reduction in anticipating holding period. The 2016 impairment charges include an aggregate impairment charge of $65,500 recognized on the sale of three land investments in New York, New York. In February 2017, the Company recognized a $5,294 loan loss on the assignment of a loan receivable secured by a hospital in Kennewick, Washington.

Fair Value Measurements

Fair Value Measurements	12 Months Ended
	Dec. 31, 2018
Fair Value Disclosures [Abstract]
Fair Value Measurements	Fair Value Measurements The following tables present the Company's assets and liabilities measured at fair value on a recurring and non-recurring basis as of December 31, 2018 and 2017 , aggregated by the level in the fair value hierarchy within which those measurements fall: Fair Value Measurements Using Description 2018 (Level 1) (Level 2) (Level 3) Interest rate swap assets $ 76 $ — $ 76 $ — Impaired real estate assets* $ 35,036 $ — $ — $ 35,036 Fair Value Measurements Using Description 2017 (Level 1) (Level 2) (Level 3) Interest rate swap assets $ 1,065 $ — $ 1,065 $ — Impaired real estate assets* $ 7,829 $ — $ — $ 7,829 *Represents a non-recurring fair value measurement. Fair value as of the date of impairment. The table below sets forth the carrying amounts and estimated fair values of the Company's financial instruments as of December 31, 2018 and 2017 : As of December 31, 2018 As of December 31, 2017 Carrying Amount Fair Value Carrying Amount Fair Value Liabilities Debt $ 1,492,483 $ 1,409,773 $ 2,068,867 $ 2,013,226 The majority of the inputs used to value the Company's interest rate swaps fall within Level 2 of the fair value hierarchy, such as observable market interest rate curves; however, the credit valuation associated with the interest rate swaps utilizes Level 3 inputs, such as estimates of current credit spreads to evaluate the likelihood of default by the Company and its counterparties. As of December 31, 2018 and 2017 , the Company determined that the credit valuation adjustment relative to the overall interest rate swaps was not significant. As a result, all interest rate swaps have been classified in Level 2 of the fair value hierarchy. The Company estimates the fair value of its real estate assets, including non-consolidated real estate assets, by using income and market valuation techniques. The Company may estimate fair values using market information such as recent sale offers or discounted cash flow models, which primarily rely on Level 3 inputs. The cash flow models include estimated cash inflows and outflows over a specified holding period. These cash flows may include contractual rental revenues, projected future rental revenues and expenses and forecasted tenant improvements and lease commissions based upon market conditions determined through discussion with local real estate professionals, experience the Company has with its other owned properties in such markets and expectations for growth. Capitalization rates and discount rates utilized in these models are estimated by management based upon rates that management believes to be within a reasonable range of current market rates for the respective properties based upon an analysis of factors such as property and tenant quality, geographical location and local supply and demand observations. To the extent the Company under-estimates forecasted cash outflows (tenant improvements, lease commissions and operating costs) or over-estimates forecasted cash inflows (rental revenue rates), the estimated fair value of its real estate assets could be overstated. The fair value of the Company's debt is primarily estimated utilizing Level 3 inputs by using a discounted cash flow analysis, based upon estimates of market interest rates. The Company determines the fair value of its Senior Notes using market prices. The inputs used in determining the fair value of these notes are categorized as Level 1 due to the fact that the Company uses quoted market rates to value these instruments. However, the inputs used in determining the fair value could be categorized as Level 2 if trading volumes are low. Fair values cannot be determined with precision, may not be substantiated by comparison to quoted prices in active markets and may not be realized upon sale. Additionally, there are inherent uncertainties in any fair value measurement technique, and changes in the underlying assumptions used, including discount rates, liquidity risks and estimates of future cash flows, could significantly affect the fair value measurement amounts. Cash Equivalents, Restricted Cash, Accounts Receivable and Accounts Payable . The Company estimates that the fair value of cash equivalents, restricted cash, accounts receivable and accounts payable approximates carrying value due to the relatively short maturity of the instruments.

Investment in and Advances to N

Investment in and Advances to Non-Consolidated Entities	12 Months Ended
	Dec. 31, 2018
Equity Method Investments and Joint Ventures [Abstract]
Investment in and Advances to Non-Consolidated Entities	Investment in and Advances to Non-Consolidated Entities Below is a schedule of the Company's investments in and advances to non-consolidated entities: Percentage Ownership at Investment Balance as of Investment December 31, 2018 December 31, 2018 December 31, 2017 NNN JV (1) 20% $ 53,144 $ — Etna Park 70 LLC (2) 90% 4,774 5,831 Other (3) 15% to 25% 8,265 11,645 $ 66,183 $ 17,476 (1) During 2018 , the Company disposed of 21 office assets to NNN JV for an aggregate gross disposition price of $725,800 and acquired a 20% interest in NNN JV. Two of the 21 properties, with a combined estimated fair value of $45,653 , were contributed to NNN JV along with cash of $8,053 . The Company recognized a gain of $14,645 in connection with the contribution of the two office assets to NNN JV, and in addition, NNN JV assumed an aggregate of $103,400 of non-recourse mortgage debt in the transaction. NNN JV obtained an aggregate of $362,800 of non-recourse mortgage financing which bears interest at LIBOR plus 200 basis points and has an initial term of three years but can be extended for two additional terms of one -year each. There is a rate increase of 15 basis points upon each extension. NNN JV entered into interest rate agreements which cap the LIBOR component of the $362,800 mortgage financing at 4.0% for two years. As of December 31, 2018 , NNN JV had total assets of $757,811 and total liabilities of $492,091 . The properties are encumbered by an aggregate of $466,200 of non-recourse mortgage debt. (2) Joint venture formed in 2017 with a developer entity to acquire a 151 -acre parcel of developable land and pursue industrial build-to-suit opportunities. The developer entity has substantive participation rights. In December 2018, the parcel was subdivided and the Company received a distribution of an ownership interest in a 57 -acre parcel with a historical cost of $3,008 . The Company acquired control of the parcel via the purchase of the Company's joint venture partners' interest. (3) At December 31, 2018 , represents two joint venture investments, which own single-tenant, net-leased assets. During 2017, the Company received $49,085 in full satisfaction of a construction financing arrangement that the Company previously provided to one of the joint ventures. In December 2018, the Company received $4,312 from a non-consolidated investment in connection with its sale of a six -property office portfolio. In February 2017, the Company sold its 40% tenant-in-common interest in its Oklahoma City, Oklahoma office property for $6,198 . In January 2016, the Company received $6,681 in connection with the sale of a non-consolidated office property in Russellville, Arkansas. The Company recognized gains of $1,777 , $1,452 and $5,378 , respectively, in connection with these sales, which are included in equity in earnings of non-consolidated entities. During 2017, the Company recognized an impairment charge of $3,512 on its investment in a retail property in Palm Beach Gardens, Florida due to the bankruptcy of its tenant. This impairment charge reduced the Company's investment balance to zero . During 2018, the property was sold in a foreclosure sale. LRA earns advisory fees from certain of these non-consolidated entities for services related to acquisitions, asset management and debt placement. Advisory fees earned from these non-consolidated investments were $1,443 , $807 and $693 for the years ended December 31, 2018 , 2017 and 2016 .

Mortgages and Notes Payable

Mortgages and Notes Payable	12 Months Ended
	Dec. 31, 2018
Debt Disclosure [Abstract]
Mortgages and Notes Payable	Mortgages and Notes Payable The Company had the following mortgages and notes payable outstanding as of December 31, 2018 and 2017 : December 31, 2018 December 31, 2017 Mortgages and notes payable $ 575,514 $ 697,068 Unamortized debt issuance costs (5,094 ) (7,258 ) $ 570,420 $ 689,810 Interest rates, including imputed rates on mortgages and notes payable, ranged from 2.2% to 6.5% at December 31, 2018 and the mortgages and notes payable mature between 2019 and 2036 . Interest rates, including imputed rates, ranged from 2.2% to 7.8% at December 31, 2017 . The weighted-average interest rate at December 31, 2018 and 2017 was approximately 4.5% and 4.6% , respectively. The Company has an unsecured credit agreement with KeyBank National Association, as agent. A summary of the significant terms, as of December 31, 2018, are as follows: Maturity Date Interest Rate $505,000 Revolving Credit Facility (1) August 2019 LIBOR + 1.00% $300,000 Term Loan (2)(3) January 2021 LIBOR + 1.10% (1) Maturity date can be extended to August 2020 at the Company's option. The interest rate ranges from LIBOR plus 0.85% to 1.55% . At December 31, 2018 , the revolving credit facility had no borrowings outstanding and availability of $505,000 , subject to covenant compliance. See note 20. (2) The interest rate ranges from LIBOR plus 0.90% to 1.75% . The Company had aggregate interest-rate swap agreements to fix the LIBOR component at a weighted-average rate of 1.42% through January 2019 on $255,000 of the $300,000 outstanding LIBOR-based borrowings. During 2018, the Company satisfied in full the $300,000 term loan due in 2020. (3) The aggregate unamortized debt issuance costs for the term loan was $1,267 and $1,804 as of December 31, 2018 and 2017 , respectively. The unsecured revolving credit facility and the unsecured term loan are subject to financial covenants, which the Company was in compliance with at December 31, 2018 . Mortgages payable and secured loans are generally collateralized by real estate and the related leases. Certain mortgages payable have yield maintenance or defeasance requirements relating to any prepayments. Scheduled principal and balloon payments for mortgages, notes payable and term loan for the next five years and thereafter are as follows: Year ending December 31, Total 2019 $ 101,887 2020 55,143 2021 340,465 2022 22,120 2023 23,998 Thereafter 331,901 875,514 Unamortized debt issuance costs (6,361 ) $ 869,153 Included in the Consolidated Statements of Operations, the Company recognized debt satisfaction gains (charges), net, of $(898) , $258 and $(7) for the years ended December 31, 2018 , 2017 and 2016 , respectively, due to the satisfaction of mortgages and notes payable other than those disclosed elsewhere in these financial statements. In addition, the Company capitalized $15 , $1,174 and $4,933 in interest for the years ended 2018 , 2017 and 2016 , respectively. Senior Notes, Convertible Notes and Trust Preferred Securities The Company had the following Senior Notes outstanding as of December 31, 2018 and 2017 : Issue Date December 31, 2018 December 31, 2017 Interest Rate Maturity Date Issue Price May 2014 $ 250,000 $ 250,000 4.40 % June 2024 99.883 % June 2013 250,000 250,000 4.25 % June 2023 99.026 % 500,000 500,000 Unamortized debt discount (1,235 ) (1,507 ) Unamortized debt issuance cost (2,731 ) (3,295 ) $ 496,034 $ 495,198 Each series of the Senior Notes is unsecured and pays interest semi-annually in arrears. The Company may redeem the notes at its option at any time prior to maturity in whole or in part by paying the principal amount of the notes being redeemed plus a premium. During 2010, the Company issued $115,000 aggregate principal amount of 6.00% Convertible Guaranteed Notes. The notes paid interest semi-annually in arrears and were scheduled to mature in January 2030 . The notes were fully satisfied/converted in 2016. During 2016 , $12,400 aggregate principal amount of the notes were converted for 1,892,269 common shares and an aggregate cash payment of $672 plus accrued and unpaid interest. The Company recognized aggregate debt satisfaction charges of $436 during 2016 relating to the conversions. During 2007, the Company issued $200,000 original principal amount of Trust Preferred Securities. The Trust Preferred Securities, which are classified as debt, are due in 2037, are open for redemption at the Company's option, bore interest at a fixed rate of 6.804% through April 2017 and thereafter bear interest at a variable rate of three month LIBOR plus 170 basis points through maturity. The interest rate at December 31, 2018 was 4.220% . As of December 31, 2018 and 2017, there was $129,120 original principal amount of Trust Preferred Securities outstanding and $1,824 and $1,924 , respectively, of unamortized debt issuance costs. Scheduled principal payments for these debt instruments for the next five years and thereafter are as follows: Year ending December 31, Total 2019 $ — 2020 — 2021 — 2022 — 2023 250,000 Thereafter 379,120 629,120 Unamortized debt discounts (1,235 ) Unamortized debt issuance costs (4,555 ) $ 623,330

Senior Notes, Convertible Notes

Senior Notes, Convertible Notes and Trust Preferred Securities	12 Months Ended
	Dec. 31, 2018
Debt Disclosure [Abstract]
Senior Notes, Convertible Notes and Trust Preferred Securities	Mortgages and Notes Payable The Company had the following mortgages and notes payable outstanding as of December 31, 2018 and 2017 : December 31, 2018 December 31, 2017 Mortgages and notes payable $ 575,514 $ 697,068 Unamortized debt issuance costs (5,094 ) (7,258 ) $ 570,420 $ 689,810 Interest rates, including imputed rates on mortgages and notes payable, ranged from 2.2% to 6.5% at December 31, 2018 and the mortgages and notes payable mature between 2019 and 2036 . Interest rates, including imputed rates, ranged from 2.2% to 7.8% at December 31, 2017 . The weighted-average interest rate at December 31, 2018 and 2017 was approximately 4.5% and 4.6% , respectively. The Company has an unsecured credit agreement with KeyBank National Association, as agent. A summary of the significant terms, as of December 31, 2018, are as follows: Maturity Date Interest Rate $505,000 Revolving Credit Facility (1) August 2019 LIBOR + 1.00% $300,000 Term Loan (2)(3) January 2021 LIBOR + 1.10% (1) Maturity date can be extended to August 2020 at the Company's option. The interest rate ranges from LIBOR plus 0.85% to 1.55% . At December 31, 2018 , the revolving credit facility had no borrowings outstanding and availability of $505,000 , subject to covenant compliance. See note 20. (2) The interest rate ranges from LIBOR plus 0.90% to 1.75% . The Company had aggregate interest-rate swap agreements to fix the LIBOR component at a weighted-average rate of 1.42% through January 2019 on $255,000 of the $300,000 outstanding LIBOR-based borrowings. During 2018, the Company satisfied in full the $300,000 term loan due in 2020. (3) The aggregate unamortized debt issuance costs for the term loan was $1,267 and $1,804 as of December 31, 2018 and 2017 , respectively. The unsecured revolving credit facility and the unsecured term loan are subject to financial covenants, which the Company was in compliance with at December 31, 2018 . Mortgages payable and secured loans are generally collateralized by real estate and the related leases. Certain mortgages payable have yield maintenance or defeasance requirements relating to any prepayments. Scheduled principal and balloon payments for mortgages, notes payable and term loan for the next five years and thereafter are as follows: Year ending December 31, Total 2019 $ 101,887 2020 55,143 2021 340,465 2022 22,120 2023 23,998 Thereafter 331,901 875,514 Unamortized debt issuance costs (6,361 ) $ 869,153 Included in the Consolidated Statements of Operations, the Company recognized debt satisfaction gains (charges), net, of $(898) , $258 and $(7) for the years ended December 31, 2018 , 2017 and 2016 , respectively, due to the satisfaction of mortgages and notes payable other than those disclosed elsewhere in these financial statements. In addition, the Company capitalized $15 , $1,174 and $4,933 in interest for the years ended 2018 , 2017 and 2016 , respectively. Senior Notes, Convertible Notes and Trust Preferred Securities The Company had the following Senior Notes outstanding as of December 31, 2018 and 2017 : Issue Date December 31, 2018 December 31, 2017 Interest Rate Maturity Date Issue Price May 2014 $ 250,000 $ 250,000 4.40 % June 2024 99.883 % June 2013 250,000 250,000 4.25 % June 2023 99.026 % 500,000 500,000 Unamortized debt discount (1,235 ) (1,507 ) Unamortized debt issuance cost (2,731 ) (3,295 ) $ 496,034 $ 495,198 Each series of the Senior Notes is unsecured and pays interest semi-annually in arrears. The Company may redeem the notes at its option at any time prior to maturity in whole or in part by paying the principal amount of the notes being redeemed plus a premium. During 2010, the Company issued $115,000 aggregate principal amount of 6.00% Convertible Guaranteed Notes. The notes paid interest semi-annually in arrears and were scheduled to mature in January 2030 . The notes were fully satisfied/converted in 2016. During 2016 , $12,400 aggregate principal amount of the notes were converted for 1,892,269 common shares and an aggregate cash payment of $672 plus accrued and unpaid interest. The Company recognized aggregate debt satisfaction charges of $436 during 2016 relating to the conversions. During 2007, the Company issued $200,000 original principal amount of Trust Preferred Securities. The Trust Preferred Securities, which are classified as debt, are due in 2037, are open for redemption at the Company's option, bore interest at a fixed rate of 6.804% through April 2017 and thereafter bear interest at a variable rate of three month LIBOR plus 170 basis points through maturity. The interest rate at December 31, 2018 was 4.220% . As of December 31, 2018 and 2017, there was $129,120 original principal amount of Trust Preferred Securities outstanding and $1,824 and $1,924 , respectively, of unamortized debt issuance costs. Scheduled principal payments for these debt instruments for the next five years and thereafter are as follows: Year ending December 31, Total 2019 $ — 2020 — 2021 — 2022 — 2023 250,000 Thereafter 379,120 629,120 Unamortized debt discounts (1,235 ) Unamortized debt issuance costs (4,555 ) $ 623,330

Derivatives and Hedging Activit

Derivatives and Hedging Activities	12 Months Ended
	Dec. 31, 2018
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivatives and Hedging Activities	Derivatives and Hedging Activities Risk Management Objective of Using Derivatives . The Company is exposed to certain risks arising from both its business operations and economic conditions. The Company principally manages its exposures to a wide variety of business and operational risks through management of its core business activities. The Company manages economic risks, including interest rate, liquidity, and credit risk primarily by managing the type, amount, sources, and duration of its debt funding and the use of derivative financial instruments. Specifically, the Company enters into derivative financial instruments to manage exposures that arise from business activities that result in the receipt or payment of future known and uncertain cash amounts, the value of which are determined by interest rates. The Company's derivative financial instruments are used to manage differences in the amount, timing, and duration of the Company's known or expected cash receipts and its known or expected cash payments principally related to the Company's investments and borrowings. Cash Flow Hedges of Interest Rate Risk . The Company's objectives in using interest rate derivatives are to add stability to interest expense, to manage its exposure to interest rate movements and therefore manage its cash outflows as it relates to the underlying debt instruments. To accomplish these objectives the Company primarily uses interest rate swaps as part of its interest rate risk management strategy relating to certain of its variable rate debt instruments. Interest rate swaps designated as cash flow hedges involve the receipt of variable-rate amounts from a counterparty in exchange for the Company making fixed-rate payments over the life of the agreements without exchange of the underlying notional amount. The effective portion of changes in the fair value of derivatives designated and that qualify as cash flow hedges is recorded in accumulated other comprehensive income (loss) and is subsequently reclassified into earnings in the period that the hedged forecasted transaction affects earnings. The ineffective portion of the change in fair value of the derivatives is recognized directly in earnings. The Company did not incur any ineffectiveness during 2018 , 2017 and 2016 . The Company has designated the interest rate swap agreements with its counterparties as cash flow hedges of the risk of variability attributable to changes in the LIBOR swap rates on $255,000 of LIBOR-indexed variable-rate unsecured term loans. Accordingly, changes in the fair value of the swaps are recorded in other comprehensive income (loss) and reclassified to earnings as interest becomes receivable or payable. Amounts reported in accumulated other comprehensive income (loss) related to derivatives will be reclassified to interest expense as interest payments are made on the aggregate $255,000 term loans. During the next 12 months, the Company estimates that an additional $76 will be reclassified as a decrease to interest expense if the swaps remain outstanding. As of December 31, 2018 , the Company had the following outstanding interest rate derivatives that were designated as cash flow hedges of interest rate risk: Interest Rate Derivative Number of Instruments Notional Interest Rate Swaps 5 $255,000 The table below presents the fair value of the Company's derivative financial instruments as well as their classification on the Consolidated Balance Sheets as of December 31, 2018 and 2017 . As of December 31, 2018 As of December 31, 2017 Balance Sheet Location Fair Value Balance Sheet Location Fair Value Derivatives designated as hedging instruments: Interest Rate Swap Asset Other Assets $ 76 Other Assets $ 1,065 The tables below present the effect of the Company's derivative financial instruments on the Consolidated Statements of Operations for 2018 and 2017 : Derivatives in Cash Flow Amount of Income Recognized Location of Income (Loss) Reclassified from Accumulated OCI into Income (Effective Portion) Amount of (Income) Loss Reclassified Hedging Relationships 2018 2017 2018 2017 Interest Rate Swap $ 597 $ 1,168 Interest expense $ (1,586 ) $ 930 The Company's agreements with the swap derivative counterparties contain provisions whereby if the Company defaults on the underlying indebtedness, including default where repayment of the indebtedness has not been accelerated by the lender, then the Company could also be declared in default of the swap derivative obligation. As of December 31, 2018 , the Company had not posted any collateral related to the agreements.

Leases

Leases	12 Months Ended
	Dec. 31, 2018
Leases [Abstract]
Leases	Leases Lessor: Minimum future rental receipts under the non-cancelable portion of tenant leases, assuming no new or re-negotiated leases, for the next five years and thereafter are as follows: Year ending December 31, Total 2019 $ 270,557 2020 253,660 2021 233,192 2022 212,893 2023 211,387 Thereafter 1,619,848 $ 2,801,537 The above minimum lease payments do not include reimbursements to be received from tenants for certain operating expenses and real estate taxes and do not include early termination payments provided for in certain leases. Certain leases allow for the tenant to terminate the lease if the property is deemed obsolete, as defined, and upon payment of a termination fee to the landlord, as stipulated in the lease. In addition, certain leases provide the tenant with the right to purchase the leased property at fair market value or a stipulated price. Lessee: The Company holds, through property owner subsidiaries, leasehold interests in various properties. Generally, the ground rents on these properties are either paid directly by the tenants to the fee holder or reimbursed to the Company as additional rent. Certain properties are economically owned through the holding of industrial revenue bonds and as such neither ground lease payments nor bond debt service payments are made or received, respectively. For certain of these properties, the Company has an option to purchase the fee interest. Minimum future rental payments under non-cancelable leasehold interests, excluding leases held through industrial revenue bonds and lease payments in the future that are based upon fair market value, for the next five years and thereafter are as follows: Year ending December 31, Total 2019 $ 3,826 2020 3,827 2021 3,769 2022 3,834 2023 4,008 Thereafter 28,326 $ 47,590 Rent expense for the leasehold interests was $597 , $690 and $987 in 2018 , 2017 and 2016 , respectively. The Company leases its corporate headquarters. The lease expires March 2026. The Company is responsible for its proportionate share of operating expenses and real estate taxes above a base year. In addition, the Company leases office space for its regional offices. The minimum lease payments for the Company's offices are $1,295 for 2019 , $1,296 for 2020 , $1,325 for 2021 , $1,335 for 2022 and $1,304 for 2023 and $2,935 thereafter. Rent expense for 2018 , 2017 and 2016 was $1,274 , $1,256 and $1,242 , respectively.

Concentration of Risk

Concentration of Risk	12 Months Ended
	Dec. 31, 2018
Risks and Uncertainties [Abstract]
Concentration of Risk	Concentration of Risk The Company seeks to reduce its operating and leasing risks through the geographic diversification of its properties, tenant industry diversification, avoidance of dependency on a single asset and the creditworthiness of its tenants. For the years ended December 31, 2018 , 2017 and 2016 , no single tenant represented greater than 10% of rental revenues. Cash and cash equivalent balances at certain institutions may exceed insurable amounts. The Company believes it mitigates this risk by investing in or through major financial institutions.

Equity

Equity	12 Months Ended
	Dec. 31, 2018
Equity [Abstract]
Equity	Equity Shareholders' Equity: During 2016 , the Company issued 577,823 common shares under its direct share purchase plan, which includes a dividend reinvestment component, raising net proceeds of approximately $4,115 . In 2018 and 2017, no shares were issued under this plan. During 2013, the Company implemented, and in 2016, the Company updated, its At-The-Market offering program under which the Company may issue up to $125,000 in common shares over the term of this program. During 2017 and 2016, the Company issued 1,593,603 and 976,109 common shares, respectively, under this program and generated aggregate gross proceeds of $17,362 and $10,498 , respectively. No shares were sold under this program in 2018. The proceeds from these issuances were primarily used for general working capital, to fund investments and retire indebtedness. The Company had 1,935,400 shares of Series C Cumulative Convertible Preferred Stock (“Series C Preferred”) outstanding at December 31, 2018 . The shares have a dividend of $3.25 per share per annum, have a liquidation preference of $96,770 , and the Company, if certain common share prices are achieved, can force conversion into common shares of the Company. As of December 31, 2018 , each share was convertible into 2.4339 common shares. This conversion ratio may increase over time if the Company's common share dividend exceeds certain quarterly thresholds. If certain fundamental changes occur, holders may require the Company, in certain circumstances, to repurchase all or part of their shares of Series C Preferred. In addition, upon the occurrence of certain fundamental changes, the Company will, under certain circumstances, increase the conversion rate by a number of additional common shares or, in lieu thereof, may in certain circumstances elect to adjust the conversion rate upon the shares of Series C Preferred becoming convertible into shares of the public acquiring or surviving company. The Company may, at the Company's option, cause shares of Series C Preferred to be automatically converted into that number of common shares that are issuable at the then prevailing conversion rate. The Company may exercise its conversion right only if, at certain times, the closing price of the Company's common shares equals or exceeds 125% of the then prevailing conversion price of the Series C Preferred. Investors in shares of Series C Preferred generally have no voting rights, but will have limited voting rights if the Company fails to pay dividends for six or more quarters and under certain other circumstances. Upon conversion, the Company may choose to deliver the conversion value to investors in cash, common shares, or a combination of cash and common shares. During 2018 , 2017 and 2016 , the Company issued 965,932 , 835,234 and 1,084,835 of its common shares, respectively, to certain employees and trustees. Typically, trustee share grants vest immediately. Employee share grants generally vest ratably, on anniversaries of the grant date, however, in certain situations vesting is cliff-based after a specific number of years and/or subject to meeting certain performance criteria (see note 14). In July 2015, the Company's Board of Trustees authorized the repurchase of up to 10,000,000 common shares and increased this authorization by 10,000,000 common shares in 2018. This share repurchase program has no expiration date. During 2018 and 2016, the Company repurchased and retired 5,851,252 and 1,184,113 , respectively, common shares at an average price of $8.05 and $7.56 , respectively, per common share under this share repurchase program. No shares were repurchased in 2017. There were $2,641 of unsettled repurchases as of December 31, 2018 . A summary of the changes in accumulated other comprehensive income (loss) related to the Company's cash flow hedges is as follows: Twelve months ended December 31, 2018 2017 Balance at beginning of period $ 1,065 $ (1,033 ) Other comprehensive income before reclassifications 597 1,168 Amounts of (income) loss reclassified from accumulated other comprehensive income (loss) to interest expense (1,586 ) 930 Balance at end of period $ 76 $ 1,065 Noncontrolling Interests: In conjunction with several of the Company's acquisitions in prior years, sellers were issued OP units as a form of consideration. All OP units, other than OP units owned by the Company, are redeemable for common shares at certain times, at the option of the holders, and are generally not otherwise mandatorily redeemable by the Company. The OP units are classified as a component of permanent equity as the Company has determined that the OP units are not redeemable securities as defined by GAAP. Each OP unit is currently redeemable for approximately 1.13 common shares, subject to future adjustments. During 2018 , 2017 and 2016 , 53,388 , 140,746 and 48,549 common shares, respectively, were issued by the Company, in connection with OP unit redemptions, for an aggregate value of $189 , $584 and $210 , respectively. As of December 31, 2018 , there were approximately 3,177,000 OP units outstanding other than OP units owned by the Company. All OP units receive distributions in accordance with the LCIF partnership agreement. To the extent that the Company's dividend per common share is less than the stated distribution per OP unit per the LCIF partnership agreement, the distributions per OP unit are reduced by the percentage reduction in the Company's dividend per common share. No OP units have a liquidation preference. The following discloses the effects of changes in the Company's ownership interests in its noncontrolling interests: Net Income Attributable to Shareholders and Transfers from Noncontrolling Interests 2018 2017 2016 Net income attributable to Lexington Realty Trust shareholders $ 227,415 $ 85,583 $ 95,624 Transfers from noncontrolling interests: Increase in additional paid-in-capital for redemption of noncontrolling OP units 189 584 210 Change from net income attributable to shareholders and transfers from noncontrolling interests $ 227,604 $ 86,167 $ 95,834

Benefit Plans

Benefit Plans	12 Months Ended
	Dec. 31, 2018
Employee Benefits and Share-based Compensation, Noncash [Abstract]
Benefit Plans	Benefit Plans The Company maintains an equity award plan pursuant to which qualified and non-qualified options may be issued. No common share options were issued in 2018 , 2017 and 2016 . The Company granted 1,248,501 , 1,265,500 and 2,000,000 common share options on December 31, 2010 (“2010 options”), January 8, 2010 (“2009 options”) and December 31, 2008 (“2008 options”), respectively, at an exercise price of $7.95 , $6.39 and $5.60 , respectively. The 2010 options (1) vested 20% annually on each December 31, 2011 through 2015 and (2) terminate on the earlier of (x) six months of termination of service with the Company and (y) December 31, 2020. The 2009 options (1) vested 20% annually on each December 31, 2010 through 2014 and (2) terminate on the earlier of (x) six months of termination of service with the Company and (y) December 31, 2019. The 2008 options (1) vested 50% following a 20 -day trading period where the average closing price of a common share of the Company on the New York Stock Exchange (“NYSE”) was $8.00 or higher and vested 50% following a 20 -day trading period where the average closing price of a common share of the Company on the NYSE was $10.00 or higher, and (2) terminated on the earlier of (x) termination of service with the Company or (y) December 31, 2018. As a result of the share dividends paid in 2009, each of the 2008 options were exchangeable for approximately 1.13 common shares at an exercise price of $4.97 per common share. The Company engaged third parties to value the options as of each option's respective grant date. The third parties determined the value to be $2,422 and $2,771 for the 2010 options and 2009 options, respectively, using the Black-Scholes model and $2,480 for the 2008 options using the Monte Carlo model. The options are considered equity awards as they are settled through the issuance of common shares. As such, the options were valued as of the grant date and do not require subsequent remeasurement. There were several assumptions used to fair value the options including the expected volatility in the Company's common share price based upon the fluctuation in the Company's historical common share price. The more significant assumptions underlying the determination of fair value for options granted were as follows: 2010 Options 2009 Options 2008 Options Weighted-average fair value of options granted $ 1.94 $ 2.19 $ 1.24 Weighted-average risk-free interest rate 2.54 % 3.29 % 1.33 % Weighted-average expected option lives (in years) 6.50 6.70 3.60 Weighted-average expected volatility 49.00 % 59.08 % 59.94 % Weighted-average expected dividend yield 7.40 % 6.26 % 14.40 % The Company recognized compensation expense relating to these options over an average of 5.0 years for the 2010 options and 2009 options and 3.6 years for the 2008 options. All deferred compensation costs relating to the outstanding options were fully amortized by December 31, 2015. The intrinsic value of an option is the amount by which the market value of the underlying common share at the date the option is exercised exceeds the exercise price of the option. The total intrinsic value of options exercised for the years ended December 31, 2018 and 2017 were $26 and $1,064 , respectively. Share option activity during the years indicated is as follows: Number of Shares Weighted-Average Exercise Price Per Share Balance at December 31, 2016 406,241 $ 6.78 Exercised (271,451 ) 6.48 Balance at December 31, 2017 134,790 7.39 Exercised (16,390 ) 6.99 Balance at December 31, 2018 118,400 $ 7.44 As of December 31, 2018 , the aggregate intrinsic value of options that were outstanding and exercisable was $91 . Non-vested share activity for the years ended December 31, 2018 and 2017 , is as follows: Number of Shares Weighted-Average Grant-Date Fair Value Per Share Balance at December 31, 2016 3,151,310 $ 8.09 Granted 777,900 6.83 Vested (161,912 ) 8.90 Balance at December 31, 2017 3,767,298 7.79 Granted 899,614 6.55 Vested (618,383 ) 9.70 Forfeited (593,452 ) 6.59 Balance at December 31, 2018 3,455,077 $ 7.34 During 2018 and 2017 , the Company granted common shares to certain employees and trustees as follows: 2018 2017 Performance Shares (1) Shares issued: Index - 1Q 331,025 106,706 Peer - 1Q 331,019 106,705 Index - 2Q 163,466 Peer - 2Q 163,463 Grant date fair value per share: (2) Index - 1Q $5.81 $6.82 Peer - 1Q $5.37 $6.34 Index - 2Q $4.05 Peer - 2Q $4.27 Non-Vested Common Shares: (3) Shares issued 237,570 237,560 Grant date fair value $2,190 $2,551 (1) The shares vest based on the Company's total shareholder return growth after a three -year measurement period relative to an index and a group of Company peers. Dividends will not be paid on these grants until earned. Once the performance criteria are met and the actual number of shares earned is determined, such shares vest immediately. During 2018, 116,926 of the 642,029 performance shares issued in 2015 vested. (2) The fair value of grants was determined at the grant date using a Monte Carlo simulation model. (3) The shares vest ratably over a three -year service period. In addition, during 2018 , 2017 and 2016 , the Company issued 66,318 , 57,334 , and 50,816 , respectively, of fully vested common shares to non-management members of the Company's Board of Trustees with a fair value of $599 , $596 , and $427 , respectively. As of December 31, 2018 , of the remaining 3,455,077 non-vested shares, 1,495,608 are subject to time-based vesting and 1,959,469 are subject to performance-based vesting. At December 31, 2018 , there are 4,012,870 awards available for grant. The Company has $7,915 in unrecognized compensation costs relating to the non-vested shares that will be charged to compensation expense over an average of approximately 2.1 years. The Company has established a trust for certain officers in which vested common shares granted for the benefit of the officers are deposited. The officers exert no control over the common shares in the trust and the common shares are available to the general creditors of the Company. As of December 31, 2018 and 2017 , there were 427,531 common shares in the trust. The Company sponsors a 401(k) retirement savings plan covering all eligible employees. The Company makes a discretionary matching contribution on a portion of employee participant salaries and, based on its profitability, may make an additional discretionary contribution at each fiscal year end to all eligible employees. These discretionary contributions are subject to vesting under a schedule providing for 25% annual vesting starting with the first year of employment and 100% vesting after four years of employment. Approximately $397 , $439 and $357 of contributions are applicable to 2018 , 2017 and 2016 , respectively. During 2018 , 2017 and 2016 , the Company recognized $6,901 , $8,333 and $8,415 , respectively, in expense relating to scheduled vesting and issuance of common share grants.

Related Party Transactions

Related Party Transactions	12 Months Ended
	Dec. 31, 2018
Related Party Transactions [Abstract]
Related Party Transactions	Related Party Transactions The Company has an indemnity obligation to Vornado Realty Trust ("VNO"), one of its significant shareholders, with respect to actions by the Company that affect Vornado Realty Trust's status as a REIT. All related party transactions are approved by the independent members of the Company's Board of Trustees or the Audit Committee as provided for in the Company's Code of Business Conduct and Ethics. The Company leased a property to an entity in which VNO, a significant shareholder, has an interest. During 2017 and 2016 , the Company recognized $234 and $236 , respectively, in rental revenue from this property. This property was sold in 2017. The Company leases its corporate office from an affiliate of Vornado Realty Trust. Rent expense for this property was $1,192 , $1,179 and $1,176 in 2018 , 2017 and 2016 , respectively. In connection with efforts, on a non-binding basis, to procure non-recourse mezzanine financing from an affiliate of the Company's Chairman, pursuant to the terms of the EB-5 visa program administered by the United States Citizenship and Immigration Services (“USCIS”), for a joint venture investment in Houston, Texas, in which the Company has an investment, the Company executed a guaranty in favor of an affiliate of its Chairman. The guaranty provided that the Company will reimburse investors providing the funds for such financing if the following occurs: (1) the joint venture receives such funds, (2) the USCIS denies the financing solely because the project is not permitted under the EB-5 visa program, and (3) the joint venture fails to return such funds. During 2017, USCIS approved the project, and the guaranty terminated by its terms. In 2018, the joint venture obtained $8,500 of EB-5 mezzanine financing from an affiliate of the Company's Chairman. The joint venture reimbursed the Chairman's affiliate $150 for its expenses. Under an indemnity agreement, the joint venture is required to pay an affiliate of the Company's Chairman 0.625% of the outstanding principal amount of the EB-5 mezzanine financing per annum. In addition, during 2017, the Company obtained non-recourse mezzanine financing in the initial amount of $8,000 from an affiliate of the Company's Chairman, pursuant to the terms of the EB-5 visa program administered by the USCIS, for an investment in Charlotte, North Carolina. In January 2018, the Company obtained an additional $500 of financing proceeds. The Company reimbursed the Chairman's affiliate approximately $105 for its expenses and paid a $128 structuring fee to the Chairman's affiliate. The property was subsequently contributed to, and the financing assumed by, NNN JV.

Income Taxes

Income Taxes	12 Months Ended
	Dec. 31, 2018
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes The provision for income taxes relates primarily to the taxable income of the Company's taxable REIT subsidiaries. The earnings, other than in taxable REIT subsidiaries, of the Company are not generally subject to federal income taxes at the Company level due to the REIT election made by the Company. Income taxes have been provided for on the asset and liability method. Under the asset and liability method, deferred income taxes are recognized for the temporary differences between the financial reporting basis and the tax basis of assets and liabilities. The Company's provision for income taxes for the years ended December 31, 2018 , 2017 and 2016 is summarized as follows: 2018 2017 2016 Current: Federal $ (60 ) $ (107 ) $ (140 ) State and local (1,668 ) (1,810 ) (1,299 ) NOL utilized — — 59 Deferred: Federal — — (44 ) State and local — — (15 ) $ (1,728 ) $ (1,917 ) $ (1,439 ) The income tax provision differs from the amount computed by applying the statutory federal income tax rate to pre-tax operating income as follows: 2018 2017 2016 Federal provision at statutory tax rate (21% for 2018 and 34% for 2017 and 2016) $ (65 ) $ (182 ) $ (154 ) State and local taxes, net of federal benefit (11 ) (40 ) (30 ) Other (1,652 ) (1,695 ) (1,255 ) $ (1,728 ) $ (1,917 ) $ (1,439 ) For the years ended December 31, 2018 , 2017 and 2016 , the “other” amount is comprised primarily of state franchise taxes of $1,679 , $1,598 and $1,252 , respectively. A summary of the average taxable nature of the Company's common dividends for each of the years in the three -year period ended December 31, 2018 , is as follows: 2018 2017 2016 Total dividends per share $ 0.710 $ 0.700 $ 0.685 Ordinary income 87.89 % 59.93 % 96.73 % Qualifying dividend 0.14 % 0.15 % 0.22 % Capital gain — — — Return of capital 11.97 % 39.92 % 3.05 % 100.00 % 100.00 % 100.00 % A summary of the average taxable nature of the Company's dividend on shares of its Series C Preferred for each of the years in the three -year period ended December 31, 2018 , is as follows: 2018 2017 2016 Total dividends per share $ 3.25 $ 3.25 $ 3.25 Ordinary income 99.84 % 99.75 % 99.78 % Qualifying dividend 0.16 % 0.25 % 0.22 Capital gain — — — Return of capital — — — 100.00 % 100.00 % 100.00 %

Commitments and Contingencies

Commitments and Contingencies	12 Months Ended
	Dec. 31, 2018
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments and Contingencies In addition to the commitments and contingencies disclosed elsewhere, the Company has the following commitments and contingencies. The Company is obligated under certain tenant leases, including its proportionate share for leases for non-consolidated entities, to fund the expansion of the underlying leased properties. The Company, under certain circumstances, may guarantee to tenants the completion of base building improvements and the payment of tenant improvement allowances and lease commissions on behalf of its subsidiaries. The Company and LCIF are parties to a funding agreement under which the Company may be required to fund distributions made on account of LCIF's OP units. Pursuant to the funding agreement, the parties agreed that, if LCIF does not have sufficient cash available to make a quarterly distribution to its limited partners in an amount in accordance with the partnership agreement, Lexington will fund the shortfall. Payments under the agreement will be made in the form of loans to LCIF and will bear interest at prevailing rates as determined by the Company in its discretion but, no less than the applicable federal rate. LCIF's right to receive these loans will expire if no OP units remain outstanding and all such loans are repaid. No amounts have been advanced under this agreement. From time to time, the Company is directly or indirectly involved in legal proceedings arising in the ordinary course of business. Management believes, based on currently available information, and after consultation with legal counsel, that although the outcomes of those normal course proceedings are uncertain, the results of such proceedings, in the aggregate, will not have a material adverse effect on the Company's business, financial condition and results of operations. Cummins Inc. v. Lexington Columbus (Jackson Street) L.P. and Wells Fargo Bank, N.A. (State of Indiana, County of Bartholomew, in the Bartholomew Superior Court). On October 25, 2018, Cummins Inc., the tenant in the Company's Columbus, Indiana office building, filed a complaint for declaratory relief against Lexington Columbus (Jackson Street) L.P., the Company's property owner subsidiary, and Wells Fargo Bank, N.A., the trustee for the noteholders with a security interest in the office building. Under the subject lease, Cummins Inc.’s tenancy extends through July 31, 2024, with options to further extend for additional time periods. Despite failing to timely exercise a purchase option for the office building that was expressly due by July 15, 2018, where time was of the essence, Cummins Inc. has asked the court for a declaration that it is entitled to purchase the building at the option price and to terminate the lease effective July 31, 2019. Cummins Inc. does not dispute that it failed to comply with the requirements of the purchase option, but alleges that it is entitled to relief under several equitable theories. Lexington Columbus (Jackson Street) L.P. filed a motion to dismiss the complaint on January 8, 2019. The Company believes that Indiana law supports the Company's right to retain ownership of the building, and the Company intends to vigorously defend this claim. As of December 31, 2018, the Company maintained an executive severance policy and entered into related agreements with certain of its executive officers whereby the Company's executives are entitled to severance benefits upon certain events. In January 2018, the Company entered into retirement agreements with two of its then executive officers. One of the retirement agreements provides for contingent payments, not to exceed $795 , in 2020 following the receipt of certain incentive fees by the Company, if any. As of December 31, 2018, $89 of these contingent payments was earned.

Supplemental Disclosure of Stat

Supplemental Disclosure of Statement of Cash Flow Information	12 Months Ended
	Dec. 31, 2018
Supplemental Cash Flow Information [Abstract]
Supplemental Disclosure of Statement of Cash Flow Information	Supplemental Disclosure of Statement of Cash Flow Information 2018 2017 2016 Reconciliation of cash, cash equivalents and restricted cash: Cash and cash equivalents at beginning of period $ 107,762 $ 86,637 $ 93,249 Restricted cash at beginning of period 4,394 31,142 10,637 Cash, cash equivalents and restricted cash at beginning of period $ 112,156 $ 117,779 $ 103,886 Cash and cash equivalents at end of period $ 168,750 $ 107,762 $ 86,637 Restricted cash at end of period 8,497 4,394 31,142 Cash, cash equivalents and restricted cash at end of period $ 177,247 $ 112,156 $ 117,779 In addition to disclosures discussed elsewhere, during 2018 , 2017 and 2016 , the Company paid $76,562 , $75,069 and $87,692 , respectively, for interest and $2,025 , $2,340 and $1,240 , respectively, for income taxes. During 2017 and 2016 , the Company conveyed its interests in certain properties to its lenders in full satisfaction of the $12,616 and $21,582 , respectively, non-recourse mortgage notes payable. In addition, during 2016 , the Company sold its interests in certain properties, which included the assumption by the buyers of the related non-recourse mortgage debt in the aggregate amount of $242,269 .

Unaudited Quarterly Financial D

Unaudited Quarterly Financial Data	12 Months Ended
	Dec. 31, 2018
Quarterly Financial Information Disclosure [Abstract]
Unaudited Quarterly Financial Data	Unaudited Quarterly Financial Data 3/31/2018 6/30/2018 9/30/2018 12/31/2018 Total gross revenues $ 102,637 $ 105,493 $ 99,958 $ 87,251 Net income (loss) $ (14,823 ) $ (795 ) $ 220,850 $ 25,674 Net income (loss) attributable to common shareholders $ (15,957 ) $ (3,327 ) $ 216,190 $ 23,796 Net income (loss) attributable to common shareholders - basic per share $ (0.07 ) $ (0.01 ) $ 0.91 $ 0.10 Net income (loss) attributable to common shareholders - diluted per share $ (0.07 ) $ (0.01 ) $ 0.90 $ 0.10 3/31/2017 6/30/2017 9/30/2017 12/31/2017 Total gross revenues $ 96,099 $ 95,684 $ 97,689 $ 102,169 Net income $ 42,220 $ 7,365 $ 5,596 $ 31,448 Net income attributable to common shareholders $ 40,397 $ 5,519 $ 3,916 $ 29,235 Net income attributable to common shareholders - basic per share $ 0.17 $ 0.02 $ 0.02 $ 0.12 Net income attributable to common shareholders - diluted per share $ 0.17 $ 0.02 $ 0.02 $ 0.12 The sum of the quarterly income (loss) attributable to common shareholders and per common share amounts may not equal the full year amounts primarily because the computations of amounts allocated to participating securities and the weighted-average number of common shares of the Company outstanding for each quarter and the full year are made independently.

Subsequent Events

Subsequent Events	12 Months Ended
	Dec. 31, 2018
Subsequent Events [Abstract]
Subsequent Events	Subsequent Events Subsequent to December 31, 2018 and in addition to disclosures elsewhere in the financial statements, the Company: – sold a consolidated property for $79,300 ; – acquired two industrial properties for an aggregate purchase price of approximately $58,000 ; – repurchased and retired 441,581 common shares at an average price of $8.13 per common share; – replaced the Company's revolving credit facility and the 2021 term loan with a new revolving credit facility and the continuation of the 2021 term loan, which extended the maturity of the revolving credit facility to February 2023 and reduced the applicable margin rates on the revolving credit facility and 2021 term loan; – entered into an agreement to purchase upon completion the expansion of the Company's property in Richland, Washington for $67,000 ; and – declared a quarterly common share dividend of $0.1025 per common share.

Summary of Significant Accoun_2

Summary of Significant Accounting Policies (Policies)	12 Months Ended
	Dec. 31, 2018
Accounting Policies [Abstract]
Basis of Presentation and Consolidation	Basis of Presentation and Consolidation. The Company's consolidated financial statements are prepared on the accrual basis of accounting in accordance with U.S. generally accepted accounting principles (“GAAP”). The financial statements reflect the accounts of the Company and its consolidated subsidiaries. The Company consolidates its wholly-owned subsidiaries, partnerships and joint ventures which it controls (i) through voting rights or similar rights or (ii) by means other than voting rights if the Company is the primary beneficiary of a variable interest entity ("VIE"). Entities which the Company does not control and entities which are VIEs in which the Company is not the primary beneficiary are accounted for under appropriate GAAP.
Variable Interest Entity	The Company is the primary beneficiary of certain VIEs as it has a controlling financial interest in these entities. LCIF, which is consolidated and in which the Company has an approximate 96% interest, is a VIE.
Earnings Per Share	Earnings Per Share . Basic net income (loss) per share is computed by dividing net income (loss) reduced by preferred dividends and amounts allocated to certain non-vested share-based payment awards, if applicable, by the weighted-average number of common shares outstanding during the period. Diluted net income (loss) per share amounts are similarly computed but include the effect, when dilutive, of in-the-money common share options and non-vested common shares, OP units and put options of certain convertible securities.
Use of Estimates	Use of Estimates. Management has made a number of significant estimates and assumptions relating to the reporting of assets and liabilities, the disclosure of contingent assets and liabilities and the reported amounts of revenues and expenses to prepare these consolidated financial statements in conformity with GAAP. These estimates and assumptions are based on management's best estimates and judgment. Management evaluates its estimates and assumptions on an ongoing basis using historical experience and other factors, including the economic environment. Management adjusts such estimates when facts and circumstances dictate. The most significant estimates made include the recoverability of accounts receivable, allocation of property purchase price to tangible and intangible assets acquired and liabilities assumed, the determination of VIEs and which entities should be consolidated, the determination of impairment of long-lived assets and equity method investments, valuation of derivative financial instruments, valuation of awards granted under compensation plans and the useful lives of long-lived assets. Actual results could differ materially from those estimates.
Fair Value Measurements	Fair Value Measurements. The Company follows the guidance in the Financial Accounting Standards Board ("FASB") Accounting Standards Codification ("ASC") Topic 820, Fair Value Measurements and Disclosures ("Topic 820"), to determine the fair value of financial and non-financial instruments. Topic 820 defines fair value, establishes a framework for measuring fair value in GAAP and expands disclosures about fair value measurements. Topic 820 establishes a fair value hierarchy that prioritizes observable and unobservable inputs used to measure fair value into three levels: Level 1 - quoted prices (unadjusted) in active markets that are accessible at the measurement date for assets or liabilities; Level 2 - observable prices that are based on inputs not quoted in active markets, but corroborated by market data; and Level 3 - unobservable inputs, which are used when little or no market data is available. The fair value hierarchy gives the highest priority to Level 1 inputs and the lowest priority to Level 3 inputs. In determining fair value, the Company utilizes valuation techniques that maximize the use of observable inputs and minimize the use of unobservable inputs to the extent possible, as well as considering counterparty credit risk. The Company has formally elected to apply the portfolio exception within Topic 820 with respect to measuring counterparty risk for all of its derivative transactions subject to master netting arrangements.
Revenue Recognition	Revenue Recognition. The Company recognizes lease revenue on a straight-line basis over the term of the lease unless another systematic and rational basis is more representative of the time pattern in which the use benefit is derived from the leased property. Revenue is recognized on a contractual basis for leases with escalations tied to a consumer price index with no floor. Renewal options in leases with rental terms that are lower than those in the primary term are excluded from the calculation of straight-line rent if the renewals are not reasonably assured. If the Company funds tenant improvements and the improvements are deemed to be owned by the Company, revenue recognition will commence when the improvements are substantially completed and possession or control of the space is turned over to the tenant. If the Company determines that the tenant allowances are lease incentives, the Company commences revenue recognition when possession or control of the space is turned over to the tenant for tenant work to begin. The lease incentive is recorded as a deferred expense and amortized as a reduction of revenue on a straight-line basis over the respective lease term. The Company recognizes lease termination fees as rental revenue in the period received and writes off unamortized lease-related intangible and other lease-related account balances, provided there are no further Company obligations under the lease. Otherwise, such fees and balances are recognized on a straight-line basis over the remaining obligation period with the termination payments being recorded as a component of rent receivable-deferred on the Consolidated Balance Sheets.
Acquisition of Real Estate	Acquisition of Real Estate. The fair value of the real estate acquired, which includes the impact of fair value adjustments for assumed mortgage debt related to property acquisitions, is allocated to the acquired tangible assets, consisting of land, building and improvements and identified intangible assets and liabilities, consisting of the value of above-market and below-market leases, other value of in-place leases and value of tenant relationships, based in each case on their fair values. Prior to January 1, 2018, acquisition and pursuit costs were expensed as incurred and were included in property operating expense in the accompanying Consolidated Statement of Operations, which were $2,171 and $836 for 2017 and 2016, respectively. Effective January 1, 2018, the Company's acquisitions are primarily considered asset acquisitions and acquisition costs are now capitalized. The fair value of the tangible assets of an acquired property (which includes land, building and improvements and fixtures and equipment) is determined by valuing the property as if it were vacant. The “as-if-vacant” value is then allocated to land and building and improvements based on management's determination of relative fair values of these assets. Factors considered by management in performing these analyses include an estimate of carrying costs during the expected lease-up periods considering current market conditions and costs to execute similar leases. In estimating carrying costs, management includes real estate taxes, insurance and other operating expenses and estimates of lost rental revenue during the expected lease-up periods based on current market demand. Management also estimates costs to execute similar leases including leasing commissions. Management generally retains a third party to assist in the allocations. In allocating the fair value of the identified intangible assets and liabilities of an acquired property, above-market and below-market lease values are recorded based on the difference between the current in-place lease rent and management's estimate of current market rents. Below-market lease intangibles are recorded as part of deferred revenue and amortized into rental revenue over the non-cancelable periods and bargain renewal periods of the respective leases. Above-market leases are recorded as part of intangible assets and amortized as a direct charge against rental revenue over the non-cancelable portion of the respective leases. The aggregate value of other acquired intangible assets, consisting of in-place leases and tenant relationship values, is measured by the excess of (1) the purchase price paid for a property over (2) the estimated fair value of the property as if vacant, determined as set forth above. This aggregate value is allocated between in-place lease values and tenant relationship values based on management's evaluation of the specific characteristics of each tenant's lease. The value of in-place leases is amortized to expense over the remaining non-cancelable periods and any bargain renewal periods of the respective leases. The value of tenant relationships is amortized to expense over the applicable lease term plus expected renewal periods. Depreciation is determined by the straight-line method over the remaining estimated economic useful lives of the properties. The Company generally depreciates its real estate assets over periods ranging up to 40 years.
Impairment of Real Estate	Impairment of Real Estate. The Company evaluates the carrying value of all tangible and intangible real estate assets held for investment for possible impairment when an event or change in circumstance has occurred that indicates its carrying value may not be recoverable. The evaluation includes estimating and reviewing anticipated future undiscounted cash flows to be derived from the asset. If such cash flows are less than the asset's carrying value, an impairment charge is recognized to the extent by which the asset's carrying value exceeds its estimated fair value, which may be below the balance of any non-recourse financing. Estimating future cash flows and fair values is highly subjective and such estimates could differ materially from actual results.
Investments in Non-Consolidated Entities	Investments in Non-Consolidated Entities . The Company accounts for its investments in 50% or less owned entities under the equity method, unless consolidation is required. If the Company's investment in the entity is insignificant and the Company has no influence over the control of the entity then the entity is accounted for under the cost method.
Impairment of Equity Method Investments	Impairment of Equity Method Investments. The Company assesses whether there are indicators that the value of its equity method investments may be impaired. An impairment charge is recognized only if the Company determines that a decline in the value of the investment below its carrying value is other-than-temporary. The assessment of impairment is highly subjective and involves the application of significant assumptions and judgments about the Company's intent and ability to recover its investment given the nature and operations of the underlying investment, including the level of the Company's involvement therein, among other factors. To the extent an impairment is deemed to be other-than-temporary, the loss is measured as the excess of the carrying amount of the investment over the estimated fair value of the investment.
Acquisition, Development and Construction Arrangements	Acquisition, Development and Construction Arrangements. The Company evaluates loans receivable where the Company participates in residual profits through loan provisions or other contracts to ascertain whether the Company has the same risks and rewards as an owner or a joint venture partner. Where the Company concludes that such arrangements are more appropriately treated as an investment in real estate, the Company reflects such loan receivable as an equity investment in real estate under construction in the Consolidated Balance Sheets. In these cases, no interest income is recorded on the loan receivable and the Company records capitalized interest during the construction period. In arrangements where the Company engages a developer to construct a property or provide funds to a tenant to develop a property, the Company will capitalize the funds provided to the developer/tenant and internal costs of interest and real estate taxes, if applicable, during the construction period.
Properties Held For Sale	Properties Held For Sale. Assets and liabilities of properties that meet various held for sale criteria, including whether it is probable that a sale will occur within 12 months, are presented separately in the Consolidated Balance Sheets. The operating results of these properties are reflected as discontinued operations in the Consolidated Statements of Operations only if the sale of these assets represents a strategic shift in operations; if not, the operating results are included in continuing operations. Properties classified as held for sale are carried at the lower of net carrying value or estimated fair value less costs to sell and depreciation and amortization are no longer recognized. Properties that do not meet the held for sale criteria are accounted for as operating properties.
Deferred Expenses	Deferred Expenses. Deferred expenses consist primarily of revolving line of credit debt and leasing costs. Debt costs are amortized using the straight-line method, which approximates the interest method, over the terms of the debt instruments and leasing costs are amortized over the term of the related lease.
Derivative Financial Instruments	Derivative Financial Instruments . The Company accounts for its interest rate swap agreements in accordance with FASB ASC Topic 815, Derivatives and Hedging ("Topic 815"). In accordance with Topic 815, these agreements are carried on the balance sheet at their respective fair values, as an asset if fair value is positive, or as a liability if fair value is negative. If the interest rate swap is designated as a cash flow hedge, the effective portion of the interest rate swap's change in fair value is reported as a component of other comprehensive income (loss); the ineffective portion, if any, is recognized in earnings as an increase or decrease to interest expense. Upon entering into hedging transactions, the Company documents the relationship between the interest rate swap agreement and the hedged item. The Company also documents its risk-management policies, including objectives and strategies, as they relate to its hedging activities. The Company assesses, both at inception of a hedge and on an ongoing basis, whether or not the hedge is highly effective. The Company will discontinue hedge accounting on a prospective basis with changes in the estimated fair value reflected in earnings when (1) it is determined that the derivative is no longer effective in offsetting cash flows of a hedged item (including forecasted transactions), (2) it is no longer probable that the forecasted transaction will occur or (3) it is determined that designating the derivative as an interest rate swap is no longer appropriate. The Company does and may continue to utilize interest rate swap and cap agreements to manage interest rate risk, but does not anticipate entering into derivative transactions for speculative trading purposes.
Stock Compensation	Stock Compensation. The Company maintains an equity participation plan. Non-vested share grants generally vest either based upon (1) time, (2) performance and/or (3) market conditions. Options granted under the plan in 2010 vested over a five -year period and expire ten years from the date of grant. Options granted under the plan in 2008 vested upon attainment of certain market performance measures and expired ten years from the date of grant. All share-based payments to employees, including grants of employee stock options, are recognized in the Consolidated Statements of Operations based on their fair values.
Tax Status	Tax Status. The Company has made an election to qualify, and believes it is operating so as to qualify, as a REIT for federal income tax purposes. Accordingly, the Company generally will not be subject to federal income tax, provided that distributions to its shareholders equal at least the amount of its REIT taxable income as defined under Sections 856 through 860 of the Code. The Company is permitted to participate in certain activities from which it was previously precluded in order to maintain its qualification as a REIT, so long as these activities are conducted in entities which elect to be treated as taxable REIT subsidiaries under the Code. As such, the Company is subject to federal and state income taxes on the income from these activities. Income taxes, primarily related to the Company's taxable REIT subsidiaries, are accounted for under the asset and liability method. Deferred tax assets and liabilities are recognized for the estimated future tax consequences attributable to differences between the financial statement carrying amounts of existing assets and liabilities and their respective tax basis and operating loss and tax credit carry-forwards. Deferred tax assets and liabilities are measured using enacted tax rates in effect for the year in which those temporary differences are expected to be recovered or settled.
Cash and Cash Equivalents	Cash and Cash Equivalents. The Company considers all highly liquid instruments with maturities of three months or less from the date of purchase to be cash equivalents.
Restricted Cash	Restricted Cash. Restricted cash is comprised primarily of cash balances held in escrow by lenders.
Environmental Matters	Environmental Matters. Under various federal, state and local environmental laws, statutes, ordinances, rules and regulations, an owner of real property may be liable for the costs of removal or remediation of certain hazardous or toxic substances at, on, in or under such property as well as certain other potential costs relating to hazardous or toxic substances. These liabilities may include government fines, penalties and damages for injuries to persons and adjacent property. Such laws often impose liability without regard to whether the owner knew of, or was responsible for, the presence or disposal of such substances. Although most of the tenants of properties in which the Company has an interest are primarily responsible for any environmental damage and claims related to the leased premises, in the event of the bankruptcy or inability of the tenant of such premises to satisfy any obligations with respect to such environmental liability, or if the tenant is not responsible, the Company's property owner subsidiary may be required to satisfy any such obligations, should they exist. In addition, the property owner subsidiary, as the owner of such a property, may be held directly liable for any such damages or claims irrespective of the provisions of any lease.
Segment Reporting	Segment Reporting. The Company operates generally in one industry segment, single-tenant real estate assets.
Reclassification	Reclassifications . Certain amounts included in prior years' financial statements have been reclassified to conform to the current year's presentation.
Recently Issued Accounting Guidance	New Accounting Standards Adopted in 2018. In August 2016, the FASB issued ASU 2016-15, Statement of Cash Flows (Topic 230): Classification of Certain Cash Receipts and Cash Payments, which addresses how certain cash receipts and cash payments are presented and classified in the statement of cash flows. In November 2016, the FASB issued ASU 2016-18, Statement of Cash Flows (Topic 230): Restricted Cash, which clarifies guidance on the classification and presentation of changes in restricted cash. Restricted cash balances are now included along with cash and cash equivalents as of the end of the period and beginning of period, respectively, in the Company's consolidated statement of cash flows for all periods presented. In addition, separate line items showing changes in restricted cash balances are now eliminated from the Company's consolidated statement of cash flows. These ASUs were effective for fiscal years beginning after December 15, 2017, including interim periods within those years. Entities must apply the guidance retrospectively to all periods presented but may apply it prospectively if retrospective application would be impracticable. The Company adopted these ASUs effective January 1, 2018 on a retrospective basis. The effect of the adoption resulted in (1) a $109 and $4,537 change in cash flows from operating activities for 2017 and 2016, respectively, (2) a $(23,958) and $21,571 change in cash flows from investing activities for 2017 and 2016, respectively, and (3) a $(2,899) and $(5,603) change in cash flows from financing activities for 2017 and 2016, respectively. In January 2017, the FASB issued ASU 2017-01, Business Combinations (Topic 805): Clarifying the Definition of a Business, which clarifies the definition of a business when evaluating whether transactions should be accounted for as acquisitions (or disposals) of assets or businesses. The ASU was effective for reporting periods beginning after December 15, 2017. The Company expects that acquisitions of real estate or in-substance real estate will not meet the revised definition of a business and thus will be treated as asset acquisitions. Acquisition costs for those acquisitions that are not businesses will be capitalized rather than expensed. The Company adopted this guidance effective January 1, 2018 on a prospective basis. The Company's property acquisitions in 2018 were accounted for as asset acquisitions. The Company's adoption of this guidance did not have a material impact on its consolidated financial statements. In May 2014, the FASB issued ASU 2014-09, Revenue from Contracts with Customers (Topic 606), as subsequently amended, which amends the guidance for revenue recognition to eliminate the industry-specific revenue recognition guidance and replace it with a principle based approach for determining revenue recognition. The new guidance was effective for reporting periods beginning after December 15, 2017. The Company’s revenue-producing contracts are primarily leases that are not within the scope of this standard as leases are excluded from ASU 2014-09. Under ASU 2014-09, revenue recognition for real estate sales is largely based on the transfer of control and the buyer having the ability to direct the use of, or obtain substantially all of the remaining benefit from, the asset (which generally will occur on the closing date); the factor of continuing involvement is no longer a specific consideration for the timing of recognition. The Company adopted ASU 2014-09 effective January 1, 2018 using the modified retrospective approach. As the majority of the Company’s revenue is from rental income related to leases, the adoption of the ASU did not have a material impact on its consolidated financial statements. In February 2017, the FASB issued ASU 2017-05, Other Income - Gains and Losses from the Derecognition of Nonfinancial Assets (Topic 610-20), which requires that all entities account for the derecognition of a business in accordance with ASC 810, including instances in which the business is considered in-substance real estate. The ASU requires the Company to measure at fair value any retained interest in a partial sale of real estate. The Company adopted ASU 2017-05 effective January 1, 2018 using the modified retrospective approach, however there was no impact to prior balances as there were no open contracts at the date of adoption. During 2018, the Company entered into a transaction in which it contributed consolidated properties to a newly-formed joint venture and acquired a 20% interest in the joint venture. See note 7. Recently Issued Accounting Guidance. In February 2016, the FASB issued ASU 2016-02, Leases (Topic 842), which requires lessees to recognize a right of use asset and related lease liability for those leases classified as operating leases at the commencement date that have lease terms of more than 12 months and amends certain lessor guidance. The Company expects the ASU to result in the recognition of a right-of-use asset and related liability to primarily account for the Company's future obligations under its ground lease arrangements for which the Company is the lessee. The Company estimates that its initial right-of-use asset and lease liability will be within a range of $35,000 to $45,000 at adoption. From a lessor perspective, the Company expects that lease components will primarily be recognized on a straight-line basis over the lease term. ASU 2016-02 originally stated that companies would be required to bifurcate certain lease revenues between lease and non-lease components; however, the FASB issued ASU 2018-11, Leases (Topic 842): Targeted Improvements in July 2018, which allows lessors a practical expedient by class of underlying assets to account for lease and non-lease components as a single lease component if certain criteria are met. Additionally, ASU 2016-02 requires that the Company capitalize, as initial direct costs, only those costs that are incurred due to the execution of a lease. Historically, the Company has capitalized lease commissions and "other" lease related costs, primarily legal expenses. Effective January 1, 2019, the Company will not capitalize these "other" costs, however, the Company does not believe these will be material. ASU 2016-02 is effective for fiscal years beginning after December 15, 2018, and interim periods within those years. ASU 2016-02 originally required a modified retrospective method of adoption; however, under ASU 2018-11 companies may elect to recognize a cumulative-effect adjustment to the opening balance of retained earnings in the period of adoption. The Company will adopt this new guidance on January 1, 2019 utilizing the cumulative-effect adjustment outlined in ASU 2018-11. In addition, the Company will elect several practical expedients afforded to it at implementation. In August 2017, the FASB issued ASU-2017-12, Derivatives and Hedging (Topic 815): Targeted Improvements to Accounting for Hedging Activities, which amends the hedge accounting recognition and presentation requirements in Topic 815. The adoption of this guidance on January 1, 2019 did not have a material impact on the Company's consolidated financial statements.

Summary of Significant Accoun_3

Summary of Significant Accounting Policies (Tables)	12 Months Ended
	Dec. 31, 2018
Accounting Policies [Abstract]
Schedule of Variable Interest Entities	Below is a summary of selected financial data of consolidated VIEs for which the Company is the primary beneficiary included in the Consolidated Balance Sheets as of December 31, 2018 and 2017 : December 31, 2018 December 31, 2017 Real estate, net $ 509,916 $ 682,587 Total assets $ 607,963 $ 766,025 Mortgages and notes payable, net $ 192,791 $ 212,792 Total liabilities $ 203,322 $ 226,331

Earnings Per Share (Tables)

Earnings Per Share (Tables)	12 Months Ended
	Dec. 31, 2018
Earnings Per Share [Abstract]
Schedule of Earnings Per Share Reconciliation	The following is a reconciliation of the numerators and denominators of the basic and diluted earnings per share computations for each of the years in the three-year period ended December 31, 2018 : 2018 2017 2016 BASIC Net income attributable to common shareholders $ 220,838 $ 79,067 $ 89,109 Weighted-average number of common shares outstanding 236,666,375 237,758,408 233,633,058 Net income attributable to common shareholders - per common share basic $ 0.93 $ 0.33 $ 0.38 DILUTED: Net income attributable to common shareholders - basic $ 220,838 $ 79,067 $ 89,109 Impact of assumed conversions 2,528 147 (159 ) Net income attributable to common shareholders $ 223,366 $ 79,214 $ 88,950 Weighted-average common shares outstanding - basic 236,666,375 237,758,408 233,633,058 Effect of dilutive securities: Unvested share-based payment awards and options 528,495 86,285 230,352 Operating Partnership Units 3,616,120 3,693,144 3,815,621 Weighted-average common shares outstanding - diluted 240,810,990 241,537,837 237,679,031 Net income attributable to common shareholders - per common share diluted $ 0.93 $ 0.33 $ 0.37

Investments in Real Estate (Tab

Investments in Real Estate (Tables)	12 Months Ended
	Dec. 31, 2018
Real Estate Investments, Net [Abstract]
Schedule of Net Real Estate	The Company's real estate, net, consists of the following at December 31, 2018 and 2017 : 2018 2017 Real estate, at cost: Buildings and building improvements $ 2,746,446 $ 3,476,022 Land, land estates and land improvements 341,848 456,134 Fixtures and equipment — 84 Construction in progress 1,840 4,219 Real estate intangibles: In-place lease values 331,607 461,624 Tenant relationships 54,662 97,223 Above-market leases 33,343 40,244 3,509,746 4,535,550 Accumulated depreciation and amortization (1) (954,087 ) (1,225,650 ) Real estate, net $ 2,555,659 $ 3,309,900 (1) Includes accumulated amortization of real estate intangible assets of $231,443 and $334,681 in 2018 and 2017 , respectively. The estimated amortization of the above real estate intangible assets for the next five years is $24,021 in 2019 , $21,442 in 2020 , $19,501 in 2021 , $17,448 in 2022 and $17,065 in 2023 .
Schedule of Acquired Properties	The Company completed the following acquisitions and build-to-suit transactions during 2018 and 2017 : 2018 : Real Estate Intangibles Property Type Location Acquisition Date Initial Cost Basis Lease Expiration Land and Land Estate Building and Improvements Lease in-place Value Intangible Below Market Lease Intangible Industrial Olive Branch, MS April 2018 $ 44,090 07/2029 $ 1,958 $ 38,687 $ 3,445 $ — Industrial Olive Branch, MS April 2018 48,575 06/2021 2,500 42,538 5,151 (1,614 ) Industrial Edwardsville, IL June 2018 44,178 05/2030 3,649 41,292 3,467 (4,230 ) Industrial Spartanburg, SC August 2018 27,632 07/2024 1,447 23,744 2,441 — Industrial Pasadena, TX August 2018 23,868 08/2023 4,057 17,810 2,001 — Industrial Carrollton, TX September 2018 19,564 12/2033 3,228 15,766 1,247 (677 ) Industrial Goodyear, AZ November 2018 41,372 04/2026 5,247 36,115 2,014 (2,004 ) Industrial Chester, VA December 2018 66,311 06/2030 8,544 53,067 6,832 (2,132 ) $ 315,590 $ 30,630 $ 269,019 $ 26,598 $ (10,657 ) Weighted-average life of intangible assets (years) 8.4 9.4 In addition, the Company acquired a 57 -acre parcel of land from a non-consolidated joint venture and leased the parcel to a tenant to develop an industrial property. 2017 : Real Estate Intangibles Property Type Location Acquisition Date Initial Lease Expiration Land and Land Estate Building and Improvements Lease in-place Value Intangible Below Market Lease Intangible Office Lake Jackson, TX (1) January 2017 $ 70,401 10/2036 $ 3,078 $ 67,323 $ — $ — Industrial New Century, KS February 2017 12,056 01/2027 — 13,198 1,648 (2,790 ) Industrial Lebanon, IN February 2017 36,194 01/2024 2,100 29,443 4,651 — Office Charlotte, NC (2) April 2017 61,339 04/2032 3,771 47,064 10,504 — Industrial Cleveland, TN May 2017 34,400 03/2024 1,871 29,743 2,786 — Industrial Grand Prairie, TX June 2017 24,317 03/2037 3,166 17,985 3,166 — Industrial San Antonio, TX June 2017 45,507 04/2027 1,311 36,644 7,552 — Industrial Opelika, AL July 2017 37,269 05/2042 134 33,183 3,952 — Industrial McDonough, GA August 2017 66,700 01/2028 5,441 52,762 8,497 — Industrial Byhalia, MS September 2017 36,590 09/2027 1,751 31,236 3,603 — Industrial Jackson, TN September 2017 57,920 10/2027 1,454 49,026 7,440 — Industrial Smyrna, TN September 2017 104,890 04/2027 1,793 93,940 9,157 — Industrial Lafayette, IN October 2017 17,450 09/2024 662 15,578 1,210 — Industrial Romulus, MI November 2017 38,893 08/2032 2,438 33,786 2,669 — Industrial Warren, MI November 2017 46,955 10/2032 972 42,521 3,462 — Industrial Winchester, VA December 2017 36,700 12/2031 1,988 32,501 2,211 — $ 727,581 $ 31,930 $ 625,933 $ 72,508 $ (2,790 ) Weighted-average life of intangible assets (years) 12.2 14.9 (1) Completed the construction of the final building of a four -building project. Initial cost basis excludes developer partner payout of $7,951 . (2) Sold to newly-formed joint venture in 2018. See note 7.

Dispositions and Impairment (Ta

Dispositions and Impairment (Tables)	12 Months Ended
	Dec. 31, 2018
Discontinued Operations and Disposal Groups [Abstract]
Schedule of Assets and Liabilities of Held for Sale Properties	Assets and liabilities of held for sale properties as of December 31, 2018 and 2017 consisted of the following: December 31, 2018 December 31, 2017 Assets: Real estate, at cost $ 63,639 $ 2,827 Real estate, intangible assets 14,498 — Accumulated depreciation and amortization (16,873 ) — Rent receivable - deferred 2,439 — Other 165 — $ 63,868 $ 2,827 Liabilities: Other $ 386 $ — $ 386 $ —

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	12 Months Ended
	Dec. 31, 2018
Fair Value Disclosures [Abstract]
Schedule of Fair Value Measurement Inputs	The following tables present the Company's assets and liabilities measured at fair value on a recurring and non-recurring basis as of December 31, 2018 and 2017 , aggregated by the level in the fair value hierarchy within which those measurements fall: Fair Value Measurements Using Description 2018 (Level 1) (Level 2) (Level 3) Interest rate swap assets $ 76 $ — $ 76 $ — Impaired real estate assets* $ 35,036 $ — $ — $ 35,036 Fair Value Measurements Using Description 2017 (Level 1) (Level 2) (Level 3) Interest rate swap assets $ 1,065 $ — $ 1,065 $ — Impaired real estate assets* $ 7,829 $ — $ — $ 7,829 *Represents a non-recurring fair value measurement. Fair value as of the date of impairment.
Fair Value, by Balance Sheet Grouping	The table below sets forth the carrying amounts and estimated fair values of the Company's financial instruments as of December 31, 2018 and 2017 : As of December 31, 2018 As of December 31, 2017 Carrying Amount Fair Value Carrying Amount Fair Value Liabilities Debt $ 1,492,483 $ 1,409,773 $ 2,068,867 $ 2,013,226

Investment in and Advances to_2

Investment in and Advances to Non-Consolidated Entities Investment in and Advances to Non-Consolidated Entities (Tables)	12 Months Ended
	Dec. 31, 2018
Equity Method Investments and Joint Ventures [Abstract]
Investments in and Advances to Affiliates	Below is a schedule of the Company's investments in and advances to non-consolidated entities: Percentage Ownership at Investment Balance as of Investment December 31, 2018 December 31, 2018 December 31, 2017 NNN JV (1) 20% $ 53,144 $ — Etna Park 70 LLC (2) 90% 4,774 5,831 Other (3) 15% to 25% 8,265 11,645 $ 66,183 $ 17,476 (1) During 2018 , the Company disposed of 21 office assets to NNN JV for an aggregate gross disposition price of $725,800 and acquired a 20% interest in NNN JV. Two of the 21 properties, with a combined estimated fair value of $45,653 , were contributed to NNN JV along with cash of $8,053 . The Company recognized a gain of $14,645 in connection with the contribution of the two office assets to NNN JV, and in addition, NNN JV assumed an aggregate of $103,400 of non-recourse mortgage debt in the transaction. NNN JV obtained an aggregate of $362,800 of non-recourse mortgage financing which bears interest at LIBOR plus 200 basis points and has an initial term of three years but can be extended for two additional terms of one -year each. There is a rate increase of 15 basis points upon each extension. NNN JV entered into interest rate agreements which cap the LIBOR component of the $362,800 mortgage financing at 4.0% for two years. As of December 31, 2018 , NNN JV had total assets of $757,811 and total liabilities of $492,091 . The properties are encumbered by an aggregate of $466,200 of non-recourse mortgage debt. (2) Joint venture formed in 2017 with a developer entity to acquire a 151 -acre parcel of developable land and pursue industrial build-to-suit opportunities. The developer entity has substantive participation rights. In December 2018, the parcel was subdivided and the Company received a distribution of an ownership interest in a 57 -acre parcel with a historical cost of $3,008 . The Company acquired control of the parcel via the purchase of the Company's joint venture partners' interest. (3) At December 31, 2018 , represents two joint venture investments, which own single-tenant, net-leased assets. During 2017, the Company received $49,085 in full satisfaction of a construction financing arrangement that the Company previously provided to one of the joint ventures.

Mortgages and Notes Payable (Ta

Mortgages and Notes Payable (Tables)	12 Months Ended
	Dec. 31, 2018
Debt Disclosure [Abstract]
Schedule of Long-term Debt Instruments	The Company had the following mortgages and notes payable outstanding as of December 31, 2018 and 2017 : December 31, 2018 December 31, 2017 Mortgages and notes payable $ 575,514 $ 697,068 Unamortized debt issuance costs (5,094 ) (7,258 ) $ 570,420 $ 689,810
Schedule of Line of Credit Facilities	A summary of the significant terms, as of December 31, 2018, are as follows: Maturity Date Interest Rate $505,000 Revolving Credit Facility (1) August 2019 LIBOR + 1.00% $300,000 Term Loan (2)(3) January 2021 LIBOR + 1.10% (1) Maturity date can be extended to August 2020 at the Company's option. The interest rate ranges from LIBOR plus 0.85% to 1.55% . At December 31, 2018 , the revolving credit facility had no borrowings outstanding and availability of $505,000 , subject to covenant compliance. See note 20. (2) The interest rate ranges from LIBOR plus 0.90% to 1.75% . The Company had aggregate interest-rate swap agreements to fix the LIBOR component at a weighted-average rate of 1.42% through January 2019 on $255,000 of the $300,000 outstanding LIBOR-based borrowings. During 2018, the Company satisfied in full the $300,000 term loan due in 2020. (3) The aggregate unamortized debt issuance costs for the term loan was $1,267 and $1,804 as of December 31, 2018 and 2017 , respectively.
Schedule of Maturities of Long-term Debt	Scheduled principal and balloon payments for mortgages, notes payable and term loan for the next five years and thereafter are as follows: Year ending December 31, Total 2019 $ 101,887 2020 55,143 2021 340,465 2022 22,120 2023 23,998 Thereafter 331,901 875,514 Unamortized debt issuance costs (6,361 ) $ 869,153 Scheduled principal payments for these debt instruments for the next five years and thereafter are as follows: Year ending December 31, Total 2019 $ — 2020 — 2021 — 2022 — 2023 250,000 Thereafter 379,120 629,120 Unamortized debt discounts (1,235 ) Unamortized debt issuance costs (4,555 ) $ 623,330

Senior Notes, Convertible Not_2

Senior Notes, Convertible Notes and Trust Preferred Securities (Tables)	12 Months Ended
	Dec. 31, 2018
Debt Disclosure [Abstract]
Debt Instrument Redemption	The Company had the following Senior Notes outstanding as of December 31, 2018 and 2017 : Issue Date December 31, 2018 December 31, 2017 Interest Rate Maturity Date Issue Price May 2014 $ 250,000 $ 250,000 4.40 % June 2024 99.883 % June 2013 250,000 250,000 4.25 % June 2023 99.026 % 500,000 500,000 Unamortized debt discount (1,235 ) (1,507 ) Unamortized debt issuance cost (2,731 ) (3,295 ) $ 496,034 $ 495,198
Schedule of Maturities of Long-term Debt	Scheduled principal and balloon payments for mortgages, notes payable and term loan for the next five years and thereafter are as follows: Year ending December 31, Total 2019 $ 101,887 2020 55,143 2021 340,465 2022 22,120 2023 23,998 Thereafter 331,901 875,514 Unamortized debt issuance costs (6,361 ) $ 869,153 Scheduled principal payments for these debt instruments for the next five years and thereafter are as follows: Year ending December 31, Total 2019 $ — 2020 — 2021 — 2022 — 2023 250,000 Thereafter 379,120 629,120 Unamortized debt discounts (1,235 ) Unamortized debt issuance costs (4,555 ) $ 623,330

Derivatives and Hedging Activ_2

Derivatives and Hedging Activities (Tables)	12 Months Ended
	Dec. 31, 2018
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Schedule of Derivative Instruments	As of December 31, 2018 , the Company had the following outstanding interest rate derivatives that were designated as cash flow hedges of interest rate risk: Interest Rate Derivative Number of Instruments Notional Interest Rate Swaps 5 $255,000
Schedule of Derivative Instruments in Statement of Financial Position, Fair Value	The table below presents the fair value of the Company's derivative financial instruments as well as their classification on the Consolidated Balance Sheets as of December 31, 2018 and 2017 . As of December 31, 2018 As of December 31, 2017 Balance Sheet Location Fair Value Balance Sheet Location Fair Value Derivatives designated as hedging instruments: Interest Rate Swap Asset Other Assets $ 76 Other Assets $ 1,065
Schedule of Derivative Instruments, Gain (Loss) in Statement of Financial Performance	The tables below present the effect of the Company's derivative financial instruments on the Consolidated Statements of Operations for 2018 and 2017 : Derivatives in Cash Flow Amount of Income Recognized Location of Income (Loss) Reclassified from Accumulated OCI into Income (Effective Portion) Amount of (Income) Loss Reclassified Hedging Relationships 2018 2017 2018 2017 Interest Rate Swap $ 597 $ 1,168 Interest expense $ (1,586 ) $ 930

Leases (Tables)

Leases (Tables)	12 Months Ended
	Dec. 31, 2018
Leases [Abstract]
Schedule of Future Minimum Rental Payments Receivable for Operating Leases	Minimum future rental receipts under the non-cancelable portion of tenant leases, assuming no new or re-negotiated leases, for the next five years and thereafter are as follows: Year ending December 31, Total 2019 $ 270,557 2020 253,660 2021 233,192 2022 212,893 2023 211,387 Thereafter 1,619,848 $ 2,801,537
Schedule of Future Minimum Rental Payments for Operating Leases	Minimum future rental payments under non-cancelable leasehold interests, excluding leases held through industrial revenue bonds and lease payments in the future that are based upon fair market value, for the next five years and thereafter are as follows: Year ending December 31, Total 2019 $ 3,826 2020 3,827 2021 3,769 2022 3,834 2023 4,008 Thereafter 28,326 $ 47,590

Equity (Tables)

Equity (Tables)	12 Months Ended
	Dec. 31, 2018
Equity [Abstract]
Accumulated Other Comprehensive Income Loss	A summary of the changes in accumulated other comprehensive income (loss) related to the Company's cash flow hedges is as follows: Twelve months ended December 31, 2018 2017 Balance at beginning of period $ 1,065 $ (1,033 ) Other comprehensive income before reclassifications 597 1,168 Amounts of (income) loss reclassified from accumulated other comprehensive income (loss) to interest expense (1,586 ) 930 Balance at end of period $ 76 $ 1,065
Effects of Changes in the Company's Ownership Interests in Noncontrolling Interests	The following discloses the effects of changes in the Company's ownership interests in its noncontrolling interests: Net Income Attributable to Shareholders and Transfers from Noncontrolling Interests 2018 2017 2016 Net income attributable to Lexington Realty Trust shareholders $ 227,415 $ 85,583 $ 95,624 Transfers from noncontrolling interests: Increase in additional paid-in-capital for redemption of noncontrolling OP units 189 584 210 Change from net income attributable to shareholders and transfers from noncontrolling interests $ 227,604 $ 86,167 $ 95,834

Benefit Plans (Tables)

Benefit Plans (Tables)	12 Months Ended
	Dec. 31, 2018
Employee Benefits and Share-based Compensation, Noncash [Abstract]
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions	The more significant assumptions underlying the determination of fair value for options granted were as follows: 2010 Options 2009 Options 2008 Options Weighted-average fair value of options granted $ 1.94 $ 2.19 $ 1.24 Weighted-average risk-free interest rate 2.54 % 3.29 % 1.33 % Weighted-average expected option lives (in years) 6.50 6.70 3.60 Weighted-average expected volatility 49.00 % 59.08 % 59.94 % Weighted-average expected dividend yield 7.40 % 6.26 % 14.40 %
Schedule of Share-based Compensation, Stock Options, Activity	Share option activity during the years indicated is as follows: Number of Shares Weighted-Average Exercise Price Per Share Balance at December 31, 2016 406,241 $ 6.78 Exercised (271,451 ) 6.48 Balance at December 31, 2017 134,790 7.39 Exercised (16,390 ) 6.99 Balance at December 31, 2018 118,400 $ 7.44
Schedule of Nonvested Share Activity	Non-vested share activity for the years ended December 31, 2018 and 2017 , is as follows: Number of Shares Weighted-Average Grant-Date Fair Value Per Share Balance at December 31, 2016 3,151,310 $ 8.09 Granted 777,900 6.83 Vested (161,912 ) 8.90 Balance at December 31, 2017 3,767,298 7.79 Granted 899,614 6.55 Vested (618,383 ) 9.70 Forfeited (593,452 ) 6.59 Balance at December 31, 2018 3,455,077 $ 7.34
Schedule of Share-based Compensation, Activity	During 2018 and 2017 , the Company granted common shares to certain employees and trustees as follows: 2018 2017 Performance Shares (1) Shares issued: Index - 1Q 331,025 106,706 Peer - 1Q 331,019 106,705 Index - 2Q 163,466 Peer - 2Q 163,463 Grant date fair value per share: (2) Index - 1Q $5.81 $6.82 Peer - 1Q $5.37 $6.34 Index - 2Q $4.05 Peer - 2Q $4.27 Non-Vested Common Shares: (3) Shares issued 237,570 237,560 Grant date fair value $2,190 $2,551 (1) The shares vest based on the Company's total shareholder return growth after a three -year measurement period relative to an index and a group of Company peers. Dividends will not be paid on these grants until earned. Once the performance criteria are met and the actual number of shares earned is determined, such shares vest immediately. During 2018, 116,926 of the 642,029 performance shares issued in 2015 vested. (2) The fair value of grants was determined at the grant date using a Monte Carlo simulation model. (3) The shares vest ratably over a three -year service period

Income Taxes (Tables)

Income Taxes (Tables)	12 Months Ended
	Dec. 31, 2018
Income Tax Disclosure [Abstract]
Schedule of Components of Income Tax Expense (Benefit)	The Company's provision for income taxes for the years ended December 31, 2018 , 2017 and 2016 is summarized as follows: 2018 2017 2016 Current: Federal $ (60 ) $ (107 ) $ (140 ) State and local (1,668 ) (1,810 ) (1,299 ) NOL utilized — — 59 Deferred: Federal — — (44 ) State and local — — (15 ) $ (1,728 ) $ (1,917 ) $ (1,439 )
Statutory Accounting Practices Disclosure	The income tax provision differs from the amount computed by applying the statutory federal income tax rate to pre-tax operating income as follows: 2018 2017 2016 Federal provision at statutory tax rate (21% for 2018 and 34% for 2017 and 2016) $ (65 ) $ (182 ) $ (154 ) State and local taxes, net of federal benefit (11 ) (40 ) (30 ) Other (1,652 ) (1,695 ) (1,255 ) $ (1,728 ) $ (1,917 ) $ (1,439 )
Summary of Average Taxable Nature of Dividends	A summary of the average taxable nature of the Company's common dividends for each of the years in the three -year period ended December 31, 2018 , is as follows: 2018 2017 2016 Total dividends per share $ 0.710 $ 0.700 $ 0.685 Ordinary income 87.89 % 59.93 % 96.73 % Qualifying dividend 0.14 % 0.15 % 0.22 % Capital gain — — — Return of capital 11.97 % 39.92 % 3.05 % 100.00 % 100.00 % 100.00 % A summary of the average taxable nature of the Company's dividend on shares of its Series C Preferred for each of the years in the three -year period ended December 31, 2018 , is as follows: 2018 2017 2016 Total dividends per share $ 3.25 $ 3.25 $ 3.25 Ordinary income 99.84 % 99.75 % 99.78 % Qualifying dividend 0.16 % 0.25 % 0.22 Capital gain — — — Return of capital — — — 100.00 % 100.00 % 100.00 %

Supplemental Disclosure of St_2

Supplemental Disclosure of Statement of Cash Flow Information (Tables)	12 Months Ended
	Dec. 31, 2018
Supplemental Cash Flow Information [Abstract]
Schedule of Cash Flow, Supplemental Disclosures	2018 2017 2016 Reconciliation of cash, cash equivalents and restricted cash: Cash and cash equivalents at beginning of period $ 107,762 $ 86,637 $ 93,249 Restricted cash at beginning of period 4,394 31,142 10,637 Cash, cash equivalents and restricted cash at beginning of period $ 112,156 $ 117,779 $ 103,886 Cash and cash equivalents at end of period $ 168,750 $ 107,762 $ 86,637 Restricted cash at end of period 8,497 4,394 31,142 Cash, cash equivalents and restricted cash at end of period $ 177,247 $ 112,156 $ 117,779

Unaudited Quarterly Financial_2

Unaudited Quarterly Financial Data (Tables)	12 Months Ended
	Dec. 31, 2018
Quarterly Financial Information Disclosure [Abstract]
Schedule of Quarterly Financial Information	3/31/2018 6/30/2018 9/30/2018 12/31/2018 Total gross revenues $ 102,637 $ 105,493 $ 99,958 $ 87,251 Net income (loss) $ (14,823 ) $ (795 ) $ 220,850 $ 25,674 Net income (loss) attributable to common shareholders $ (15,957 ) $ (3,327 ) $ 216,190 $ 23,796 Net income (loss) attributable to common shareholders - basic per share $ (0.07 ) $ (0.01 ) $ 0.91 $ 0.10 Net income (loss) attributable to common shareholders - diluted per share $ (0.07 ) $ (0.01 ) $ 0.90 $ 0.10 3/31/2017 6/30/2017 9/30/2017 12/31/2017 Total gross revenues $ 96,099 $ 95,684 $ 97,689 $ 102,169 Net income $ 42,220 $ 7,365 $ 5,596 $ 31,448 Net income attributable to common shareholders $ 40,397 $ 5,519 $ 3,916 $ 29,235 Net income attributable to common shareholders - basic per share $ 0.17 $ 0.02 $ 0.02 $ 0.12 Net income attributable to common shareholders - diluted per share $ 0.17 $ 0.02 $ 0.02 $ 0.12

The Company (Details)

The Company (Details)	Dec. 31, 2018Propertystate
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Number of consolidated properties | Property	135
Number of states in which entity has interests | state	34

Summary of Significant Accoun_4

Summary of Significant Accounting Policies - Additional Information (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2018USD ($)segment	Dec. 31, 2017USD ($)	Dec. 31, 2016USD ($)	Jan. 01, 2019USD ($)
Property, Plant and Equipment [Line Items]
Acquisition expense		$ 2,171	$ 836
Vesting period (in years)	5 years
Expiration period of options (in years)	10 years
Number of operating segments | segment	1
Increase (decrease) in cash from operating activities	$ 217,811	227,870	239,810
Increase (decrease) in cash from investing activities	554,891	(283,074)	11,384
Increase (decrease) in cash from financing activities	$ (707,611)	49,581	(237,301)
Minimum [Member]
Property, Plant and Equipment [Line Items]
Co-venture equity ownership percentage	15.00%
Maximum [Member]
Property, Plant and Equipment [Line Items]
Co-venture equity ownership percentage	25.00%
NNN Office Joint Venture [Member]
Property, Plant and Equipment [Line Items]
Co-venture equity ownership percentage	20.00%
Accounting Standards Update 2016-15 [Member]
Property, Plant and Equipment [Line Items]
Increase (decrease) in cash from operating activities		109	4,537
Increase (decrease) in cash from investing activities		(23,958)	21,571
Increase (decrease) in cash from financing activities		(2,899)	$ (5,603)
Accounting Standards Update 2016-02 [Member] | Subsequent Event [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Right-of-use asset				$ 35,000
Lease, liability				35,000
Accounting Standards Update 2016-02 [Member] | Subsequent Event [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Right-of-use asset				45,000
Lease, liability				$ 45,000
Building and Building Improvements [Member]
Property, Plant and Equipment [Line Items]
Maximum useful life of PPE (in years)	40 years
Office Building [Member] | Lake Jackson, Texas [Member]
Property, Plant and Equipment [Line Items]
Redemption of noncontrolling interests	$ 7,951
Variable Interest Entity, Primary Beneficiary [Member]
Property, Plant and Equipment [Line Items]
VIE, ownership percentage	96.00%
Variable Interest Entity, Primary Beneficiary [Member] | Office Building [Member] | Affiliated Entity [Member] | Lake Jackson, Texas [Member]
Property, Plant and Equipment [Line Items]
Redemption of noncontrolling interests		$ 7,951

Summary of Significant Accoun_5

Summary of Significant Accounting Policies - Variable Interest Entities (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Variable Interest Entity [Line Items]
Real estate, net	$ 2,555,659	$ 3,309,900
Total assets	2,953,840	3,553,020
Mortgages and notes payable, net	570,420	689,810
Total liabilities	1,607,162	2,212,185
Variable Interest Entity, Primary Beneficiary [Member]
Variable Interest Entity [Line Items]
Real estate, net	509,916	682,587
Total assets	607,963	766,025
Mortgages and notes payable, net	192,791	212,792
Total liabilities	$ 203,322	$ 226,331

Earnings Per Share (Details)

Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
BASIC
Net income attributable to common shareholders									$ 220,838	$ 79,067	$ 89,109
Weighted-average common shares outstanding - basic (in shares)									236,666,375	237,758,408	233,633,058
Net income attributable to common shareholders - basic (usd per share)	$ 0.10	$ 0.91	$ (0.01)	$ (0.07)	$ 0.12	$ 0.02	$ 0.02	$ 0.17	$ 0.93	$ 0.33	$ 0.38
DILUTED:
Net income attributable to common shareholders - basic									$ 220,838	$ 79,067	$ 89,109
Impact of assumed conversions									2,528	147	(159)
Net income attributable to common shareholders									$ 223,366	$ 79,214	$ 88,950
Weighted-average common shares outstanding - basic (in shares)									236,666,375	237,758,408	233,633,058
Effect of dilutive securities:
Unvested share-based payment awards and options (in shares)									528,495	86,285	230,352
Operating Partnership Units (in units)									3,616,120	3,693,144	3,815,621
Weighted-average common shares outstanding (in shares)									240,810,990	241,537,837	237,679,031
Net income (loss) attributable to common shareholders - per common share diluted (usd per share)	$ 0.10	$ 0.90	$ (0.01)	$ (0.07)	$ 0.12	$ 0.02	$ 0.02	$ 0.17	$ 0.93	$ 0.33	$ 0.37

Investments in Real Estate - S

Investments in Real Estate - Schedule of Net Real Estate (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Real Estate [Line Items]
Buildings and building improvements	$ 2,746,446	$ 3,476,022
Land, land estates and land improvements	341,848	456,134
Fixtures and equipment	0	84
Construction in progress	1,840	4,219
Real estate - intangible assets	419,612	599,091
Real estate, gross	3,509,746	4,535,550
Accumulated depreciation and amortization	(954,087)	(1,225,650)
Real estate, net	2,555,659	3,309,900
Accumulated amortization	231,443	334,681
Amortization expense, next 12 months	24,021
Amortization expense, year 2	21,442
Amortization expense, year 3	19,501
Amortization expense, year 4	17,448
Amortization expense, year 5	17,065
Leases, Acquired-in-Place [Member]
Real Estate [Line Items]
Real estate - intangible assets	331,607	461,624
Customer Relationships [Member]
Real Estate [Line Items]
Real estate - intangible assets	54,662	97,223
Above Market Leases [Member]
Real Estate [Line Items]
Real estate - intangible assets	$ 33,343	$ 40,244

Investments in Real Estate - A

Investments in Real Estate - Additional Information (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2017USD ($)a	Dec. 31, 2018USD ($)a
Real Estate [Line Items]
Below-market leases, net of accretion	$ 23,308	$ 17,923
Future accretion, year 1		2,144
Future accretion, year 2		2,118
Future accretion, year 3		1,778
Future accretion, year 4		1,499
Future accretion, year 5		$ 1,499
Change in amount of contingent consideration	$ 3,922
Etna GL 66 LLC [Member]
Real Estate [Line Items]
Area of land (in acres) | a	151	57

Investments in Real Estate -_2

Investments in Real Estate - Schedule of Acquired Properties (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2018USD ($)building	Dec. 31, 2017USD ($)
Real Estate [Line Items]
Initial Cost Basis	$ 315,590	$ 727,581
Land and Land Estate	30,630	31,930
Building and Improvements	269,019	625,933
Lease in-place Value	26,598	72,508
Below Market Lease	$ (10,657)	$ (2,790)
Leases, Acquired-in-Place [Member]
Real Estate [Line Items]
Weighted-average life of intangible assets (years)	8 years 4 months 24 days	12 years 2 months
Leases, Acquired-in-Place, Market Adjustment [Member]
Real Estate [Line Items]
Weighted-average life of intangible assets (years)	9 years 4 months 24 days	14 years 11 months
Industrial Property [Member] | Olive Branch, Mississippi [Member] | Olive Branch, Mississippi, Industrial Property Expiring 2029 [Member]
Real Estate [Line Items]
Initial Cost Basis	$ 44,090
Land and Land Estate	1,958
Building and Improvements	38,687
Lease in-place Value	3,445
Below Market Lease	0
Industrial Property [Member] | Olive Branch, Mississippi [Member] | Olive Branch, Mississippi, Industrial Property Expiring 2021 [Member]
Real Estate [Line Items]
Initial Cost Basis	48,575
Land and Land Estate	2,500
Building and Improvements	42,538
Lease in-place Value	5,151
Below Market Lease	(1,614)
Industrial Property [Member] | Edwardsville, Illinois [Member]
Real Estate [Line Items]
Initial Cost Basis	44,178
Land and Land Estate	3,649
Building and Improvements	41,292
Lease in-place Value	3,467
Below Market Lease	(4,230)
Industrial Property [Member] | Spartanburg, South Carolina [Member]
Real Estate [Line Items]
Initial Cost Basis	27,632
Land and Land Estate	1,447
Building and Improvements	23,744
Lease in-place Value	2,441
Below Market Lease	0
Industrial Property [Member] | Pasadena, Texas [Member]
Real Estate [Line Items]
Initial Cost Basis	23,868
Land and Land Estate	4,057
Building and Improvements	17,810
Lease in-place Value	2,001
Below Market Lease	0
Industrial Property [Member] | Carrollton, Texas [Member]
Real Estate [Line Items]
Initial Cost Basis	19,564
Land and Land Estate	3,228
Building and Improvements	15,766
Lease in-place Value	1,247
Below Market Lease	(677)
Industrial Property [Member] | Goodyear, Arizona [Member]
Real Estate [Line Items]
Initial Cost Basis	41,372
Land and Land Estate	5,247
Building and Improvements	36,115
Lease in-place Value	2,014
Below Market Lease	(2,004)
Industrial Property [Member] | Chester, South Carolina [Member]
Real Estate [Line Items]
Initial Cost Basis	66,311
Land and Land Estate	8,544
Building and Improvements	53,067
Lease in-place Value	6,832
Below Market Lease	$ (2,132)
Industrial Property [Member] | New Century, Kansas [Member]
Real Estate [Line Items]
Initial Cost Basis		$ 12,056
Land and Land Estate		0
Building and Improvements		13,198
Lease in-place Value		1,648
Below Market Lease		(2,790)
Industrial Property [Member] | Lebanon, Indiana [Member]
Real Estate [Line Items]
Initial Cost Basis		36,194
Land and Land Estate		2,100
Building and Improvements		29,443
Lease in-place Value		4,651
Below Market Lease		0
Industrial Property [Member] | Cleveland, Tennessee [Member]
Real Estate [Line Items]
Initial Cost Basis		34,400
Land and Land Estate		1,871
Building and Improvements		29,743
Lease in-place Value		2,786
Below Market Lease		0
Industrial Property [Member] | Grand Prairie, Texas [Member]
Real Estate [Line Items]
Initial Cost Basis		24,317
Land and Land Estate		3,166
Building and Improvements		17,985
Lease in-place Value		3,166
Below Market Lease		0
Industrial Property [Member] | San Antonio, Texas [Member]
Real Estate [Line Items]
Initial Cost Basis		45,507
Land and Land Estate		1,311
Building and Improvements		36,644
Lease in-place Value		7,552
Below Market Lease		0
Industrial Property [Member] | Opelika, Alabama [Member]
Real Estate [Line Items]
Initial Cost Basis		37,269
Land and Land Estate		134
Building and Improvements		33,183
Lease in-place Value		3,952
Below Market Lease		0
Industrial Property [Member] | McDonough, Georgia [Member]
Real Estate [Line Items]
Initial Cost Basis		66,700
Land and Land Estate		5,441
Building and Improvements		52,762
Lease in-place Value		8,497
Below Market Lease		0
Industrial Property [Member] | Byhalia, Mississippi [Member]
Real Estate [Line Items]
Initial Cost Basis		36,590
Land and Land Estate		1,751
Building and Improvements		31,236
Lease in-place Value		3,603
Below Market Lease		0
Industrial Property [Member] | Jackson, Tennessee [Member]
Real Estate [Line Items]
Initial Cost Basis		57,920
Land and Land Estate		1,454
Building and Improvements		49,026
Lease in-place Value		7,440
Below Market Lease		0
Industrial Property [Member] | Smyrna, Tennessee [Member]
Real Estate [Line Items]
Initial Cost Basis		104,890
Land and Land Estate		1,793
Building and Improvements		93,940
Lease in-place Value		9,157
Below Market Lease		0
Industrial Property [Member] | Lafayette, Indiana [Member]
Real Estate [Line Items]
Initial Cost Basis		17,450
Land and Land Estate		662
Building and Improvements		15,578
Lease in-place Value		1,210
Below Market Lease		0
Industrial Property [Member] | Romulus, Michigan [Member]
Real Estate [Line Items]
Initial Cost Basis		38,893
Land and Land Estate		2,438
Building and Improvements		33,786
Lease in-place Value		2,669
Below Market Lease		0
Industrial Property [Member] | Warren, Michigan [Member]
Real Estate [Line Items]
Initial Cost Basis		46,955
Land and Land Estate		972
Building and Improvements		42,521
Lease in-place Value		3,462
Below Market Lease		0
Industrial Property [Member] | Winchester, Virginia [Member]
Real Estate [Line Items]
Initial Cost Basis		36,700
Land and Land Estate		1,988
Building and Improvements		32,501
Lease in-place Value		2,211
Below Market Lease		0
Office Property [Member] | Lake Jackson, Texas [Member]
Real Estate [Line Items]
Initial Cost Basis		70,401
Land and Land Estate		3,078
Building and Improvements		67,323
Lease in-place Value		0
Below Market Lease		0
Number of buildings completed | building	4
Redemption of noncontrolling interests	$ 7,951
Office Property [Member] | Charlotte, North Carolina [Member]
Real Estate [Line Items]
Initial Cost Basis		61,339
Land and Land Estate		3,771
Building and Improvements		47,064
Lease in-place Value		10,504
Below Market Lease		$ 0

Dispositions and Impairment - A

Dispositions and Impairment - Additional Information (Details) $ in Thousands	1 Months Ended		12 Months Ended
	Dec. 31, 2018Propertyproperty	Feb. 28, 2017USD ($)	Dec. 31, 2018USD ($)buildingProperty	Dec. 31, 2017USD ($)Property	Dec. 31, 2016USD ($)Property
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from sale of property			$ 898,514	$ 223,853	$ 370,038
Aggregate gain on sale of properties			252,913	63,428	81,510
Gain (loss) on debt extinguishment on sale of properties			$ (1,698)	$ 5,938	(532)
Properties classified as held-for-sale (in number of properties) | Property	2		2	1
Other asset impairment charges			$ 95,813	$ 39,702	$ 100,195
Impairment charges on real estate			36,620	18,023
Impairment losses related to real estate partnerships		$ 5,294
Office Building [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Aggregate gain on sale of properties		$ 1,777
Number of properties sold | property	6
Asset impairment charges			23,496	$ 15,008
Land [Member] | New York, New York [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of properties sold | Property					3
Impairment charges on real estate					$ 65,500
NNN Office Joint Venture Properties [Member] | Transferred Property [Member] | Office Building [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from sale of property			$ 725,800
Number of properties sold | building			21

Dispositions and Impairment - S

Dispositions and Impairment - Schedule of Properties Held for Sale (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Discontinued Operations and Disposal Groups [Abstract]
Real estate, at cost	$ 63,639	$ 2,827
Real estate, intangible assets	14,498	0
Accumulated depreciation and amortization	(16,873)	0
Rent receivable - deferred	2,439	0
Other	165	0
Assets held for sale	63,868	2,827
Other	386	0
Liabilities held for sale	$ 386	$ 0

Fair Value Measurements - Sche

Fair Value Measurements - Schedule of Fair Value Measurements Inputs (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Interest rate swap assets	$ 76	$ 1,065
Fair Value, Measurements, Nonrecurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired real estate assets	35,036	7,829
Fair Value Measurements Using Level 1 [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Interest rate swap assets	0	0
Fair Value Measurements Using Level 1 [Member] | Fair Value, Measurements, Nonrecurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired real estate assets	0	0
Fair Value Measurements Using Level 2 [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Interest rate swap assets	76	1,065
Fair Value Measurements Using Level 2 [Member] | Fair Value, Measurements, Nonrecurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired real estate assets	0	0
Fair Value Measurements Using Level 3 [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Interest rate swap assets	0	0
Fair Value Measurements Using Level 3 [Member] | Fair Value, Measurements, Nonrecurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired real estate assets	$ 35,036	$ 7,829

Fair Value Measurements - Fair

Fair Value Measurements - Fair Value, by Balance Sheet Grouping (Details) - Fair Value Measurements Using Level 3 [Member] - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Carrying Amount [Member]
Liabilities
Debt, Carrying Amount	$ 1,492,483	$ 2,068,867
Fair Value [Member]
Liabilities
Debt, Fair Value	$ 1,409,773	$ 2,013,226

Investment in and Advances to_3

Investment in and Advances to Non-Consolidated Entities - Schedule of Investments in and Non-consolidated Entities (Details) $ in Thousands	1 Months Ended	12 Months Ended
	Dec. 31, 2018USD ($)apropertypartnershipterm	Dec. 31, 2018USD ($)abuildingpartnershipterm	Dec. 31, 2017USD ($)a	Dec. 31, 2016USD ($)
Schedule of Equity Method Investments [Line Items]
Equity method investments	$ 66,183	$ 66,183	$ 17,476
Proceeds from sale of property		898,514	223,853	$ 370,038
Payments to acquire interest in joint venture		0	7,951	$ 0
Real estate, at cost	3,090,134	3,090,134	3,936,459
NNN Office Joint Venture [Member]
Schedule of Equity Method Investments [Line Items]
Non-recourse debt	466,200	466,200
Mortgages [Member] | NNN Office Joint Venture [Member]
Schedule of Equity Method Investments [Line Items]
Non-recourse debt	$ 362,800	$ 362,800
Long-term debt, term	3 years	3 years
Number of additional extensions available | term	2	2
Term of additional extensions		1 year
Term of contract		2 years
Mortgages [Member] | NNN Office Joint Venture [Member] | London Interbank Offered Rate (LIBOR) [Member]
Schedule of Equity Method Investments [Line Items]
Basis spread on variable rate		2.00%
Basis spread rate increase per extension		0.15%
Cap interest rate	4.00%	4.00%
Office Building [Member]
Schedule of Equity Method Investments [Line Items]
Number of properties sold | property	6
NNN Office Joint Venture Properties [Member]
Schedule of Equity Method Investments [Line Items]
Equity method investments, assets	$ 757,811	$ 757,811
Equity method investments, liabilities	$ 492,091	$ 492,091
NNN Office Joint Venture Properties [Member] | Office Building [Member] | Transferred Property [Member]
Schedule of Equity Method Investments [Line Items]
Number of properties sold | building		21
Proceeds from sale of property		$ 725,800
Minimum [Member]
Schedule of Equity Method Investments [Line Items]
Ownership percentage	15.00%	15.00%
Maximum [Member]
Schedule of Equity Method Investments [Line Items]
Ownership percentage	25.00%	25.00%
NNN Office Joint Venture [Member]
Schedule of Equity Method Investments [Line Items]
Ownership percentage	20.00%	20.00%
Equity method investments	$ 53,144	$ 53,144	0
NNN Office Joint Venture [Member] | 2 of 21 Transferred Properties [Member]
Schedule of Equity Method Investments [Line Items]
Contribution of property		45,653
Payments to acquire interest in joint venture		8,053
Gain (loss) on disposition of assets		14,645
Transfer mortgage payable		$ 103,400
Etna Park 70 [Member]
Schedule of Equity Method Investments [Line Items]
Ownership percentage	90.00%	90.00%
Equity method investments	$ 4,774	$ 4,774	$ 5,831
Etna GL 66 LLC [Member]
Schedule of Equity Method Investments [Line Items]
Area of land (in acres) | a	57	57	151
Real estate, at cost	$ 3,008	$ 3,008
Other Joint Ventures [Member]
Schedule of Equity Method Investments [Line Items]
Equity method investments	$ 8,265	$ 8,265	$ 11,645
Number of joint venture interests | partnership	2	2
Proceeds from collection of loans receivable			$ 49,085

Investment in and Advances to_4

Investment in and Advances to Non-Consolidated Entities - Additional Information (Details) $ in Thousands	1 Months Ended			12 Months Ended
	Dec. 31, 2018USD ($)property	Feb. 28, 2017USD ($)	Jan. 31, 2016USD ($)	Dec. 31, 2018USD ($)	Dec. 31, 2017USD ($)	Dec. 31, 2016USD ($)	Jan. 31, 2017
Investments in and Advances to Affiliates [Line Items]
Aggregate gain on sale of properties				$ 252,913	$ 63,428	$ 81,510
Impairment charges on real estate				36,620	18,023
Investment advisory fees				30,608	31,809	31,431
Lexington Reality Advisors Inc [Member] | Investment Advice [Member]
Investments in and Advances to Affiliates [Line Items]
Investment advisory fees				$ 1,443	807	$ 693
Palm Beach Gardens, Florida [Member]
Investments in and Advances to Affiliates [Line Items]
Impairment charges on real estate					$ 3,512
Oklahoma City, Oklahoma [Member] | Tenant-in-Common [Member]
Investments in and Advances to Affiliates [Line Items]
Proceeds from divestiture of interest in joint venture		$ 6,198
Co-venture equity ownership percentage							40.00%
Aggregate gain on sale of properties		1,452
Office Building [Member]
Investments in and Advances to Affiliates [Line Items]
Proceeds from divestiture of interest in joint venture	$ 4,312
Number of properties sold | property	6
Aggregate gain on sale of properties		$ 1,777
Office Building [Member] | Russellville, Arkansas [Member]
Investments in and Advances to Affiliates [Line Items]
Proceeds from divestiture of interest in joint venture			$ 6,681
Aggregate gain on sale of properties			$ 5,378

Mortgages and Notes Payable - S

Mortgages and Notes Payable - Schedule of Mortgages and Notes Payable (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Debt Instrument [Line Items]
Unamortized debt issuance costs	$ (5,094)
Mortgages and Notes Payable [Member]
Debt Instrument [Line Items]
Mortgages and notes payable	575,514	$ 697,068
Unamortized debt issuance costs	(5,094)	(7,258)
Long-term debt	$ 570,420	$ 689,810

Mortgages and Notes Payable - A

Mortgages and Notes Payable - Additional Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Debt Instrument [Line Items]
Debt satisfaction gains (charges), net	$ (2,596)	$ 6,196	$ (975)
Interest paid, capitalized	$ 15	$ 1,174	4,933
Mortgages and Notes Payable [Member]
Debt Instrument [Line Items]
Weighted-average interest rate	4.50%	4.60%
Debt satisfaction gains (charges), net	$ (898)	$ 258	$ (7)
Minimum [Member] | Mortgages and Notes Payable [Member]
Debt Instrument [Line Items]
Debt interest rate percentage	2.20%
Effective interest percentage		2.20%
Maximum [Member] | Mortgages and Notes Payable [Member]
Debt Instrument [Line Items]
Debt interest rate percentage	6.50%
Effective interest percentage		7.80%

Mortgages and Notes Payable - C

Mortgages and Notes Payable - Credit Agreement Terms (Details) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Debt Instrument [Line Items]
Remaining borrowing capacity	$ 505,000,000
Unsecured Term Loan [Member]
Debt Instrument [Line Items]
Debt issuance costs, gross	1,267,000	$ 1,804,000
Unsecured Revolving Credit Facility, Expiring August 2019 [Member] | Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Face amount	$ 505,000,000
Unsecured Term Loan, Expiring January 2021 [Member] | Minimum [Member]
Debt Instrument [Line Items]
Interest rate stated percentage rate range minimum excluding LIBOR	0.90%
Unsecured Term Loan, Expiring January 2021 [Member] | Maximum [Member]
Debt Instrument [Line Items]
Interest rate stated percentage rate range minimum excluding LIBOR	1.75%
Unsecured Term Loan, Expiring January 2021 [Member] | Unsecured Term Loan [Member]
Debt Instrument [Line Items]
Face amount	$ 300,000,000
Unsecured Term Loan, Expiring January 2019 [Member] | Interest Rate Swap [Member]
Debt Instrument [Line Items]
Weighted-average interest rate	1.42%
Unsecured Term Loan, Expiring January 2019 [Member] | Unsecured Term Loan [Member]
Debt Instrument [Line Items]
Face amount	$ 255,000,000
London Interbank Offered Rate (LIBOR) [Member] | Unsecured Revolving Credit Facility, Expiring August 2019 [Member] | Minimum [Member]
Debt Instrument [Line Items]
Interest rate stated percentage rate range minimum excluding LIBOR	0.85%
London Interbank Offered Rate (LIBOR) [Member] | Unsecured Revolving Credit Facility, Expiring August 2019 [Member] | Maximum [Member]
Debt Instrument [Line Items]
Interest rate stated percentage rate range minimum excluding LIBOR	1.55%
London Interbank Offered Rate (LIBOR) [Member] | Unsecured Revolving Credit Facility, Expiring August 2019 [Member] | Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Interest rate stated percentage rate range minimum excluding LIBOR	1.00%
London Interbank Offered Rate (LIBOR) [Member] | Unsecured Term Loan, Expiring January 2021 [Member] | Unsecured Term Loan [Member]
Debt Instrument [Line Items]
Interest rate stated percentage rate range minimum excluding LIBOR	1.10%

Mortgages and Notes Payable - M

Mortgages and Notes Payable - Maturities of Long-term Debt (Details) $ in Thousands	Dec. 31, 2018USD ($)
Debt Instrument [Line Items]
Unamortized debt issuance costs	$ (5,094)
Mortgages, Notes Payable, Credit Facility Borrowings, and Term Loans [Member]
Debt Instrument [Line Items]
2019	101,887
2020	55,143
2021	340,465
2022	22,120
2023	23,998
Thereafter	331,901
Long-term debt, gross	875,514
Unamortized debt issuance costs	(6,361)
Long-term debt	$ 869,153

Senior Notes, Convertible Not_3

Senior Notes, Convertible Notes and Trust Preferred Securities - Schedule of Long-term Debt Instruments (Details) - USD ($)	Dec. 31, 2018	Dec. 31, 2017
Debt Instrument [Line Items]
Unamortized debt issuance costs	$ (5,094,000)
Senior Notes [Member]
Debt Instrument [Line Items]
Principal amount of debt component	500,000,000	$ 500,000,000
Unamortized debt discounts	(1,235,000)	(1,507,000)
Unamortized debt issuance costs	(2,731,000)	(3,295,000)
Long-term debt	496,034,000	495,198,000
Senior Notes [Member] | Senior Notes Due 2024 [Member]
Debt Instrument [Line Items]
Principal amount of debt component	$ 250,000,000	250,000,000
Debt interest rate percentage	4.40%
Issue Price	99.883%
Senior Notes [Member] | Senior Notes Due 2023 [Member]
Debt Instrument [Line Items]
Principal amount of debt component	$ 250,000,000	$ 250,000,000
Debt interest rate percentage	4.25%
Issue Price	99.026%

Senior Notes, Convertible Not_4

Senior Notes, Convertible Notes and Trust Preferred Securities - Narrative (Details) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2007	Dec. 31, 2010
Accounts, Notes, Loans and Financing Receivable [Line Items]
Debt satisfaction (gains) charges, net	$ 2,596,000	$ (6,196,000)	$ 975,000
Convertible Debt [Member] | Six Percent Convertible Guaranteed Note [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Face amount					$ 115,000,000
Debt interest rate percentage					6.00%
Original debt, amount			$ 12,400,000
Shares issued (in shares)			1,892,269
Cash payments			$ 672,000
Debt satisfaction (gains) charges, net			$ 436,000
6.804% Trust Preferred Securities [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Face amount				$ 200,000,000
Debt interest rate percentage				6.804%
Effective interest percentage	4.22%
Principal amount outstanding on Trust Preferred Securities	$ 129,120,000	129,120,000
Debt issuance costs, gross	$ 1,824,000	$ 1,924,000
6.804% Trust Preferred Securities [Member] | London Interbank Offered Rate (LIBOR) [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Basis spread on variable rate				1.70%

Senior Notes, Convertible Not_5

Senior Notes, Convertible Notes and Trust Preferred Securities - Schedule of Maturities of Long-term Debt (Details) $ in Thousands	Dec. 31, 2018USD ($)
Debt Instrument [Line Items]
Unamortized debt issuance costs	$ (5,094)
Senior Notes, Convertible Notes, and Trust Preferred Securities [Member]
Debt Instrument [Line Items]
2019	0
2020	0
2021	0
2022	0
2023	250,000
Thereafter	379,120
Long-term debt, gross	629,120
Unamortized debt discounts	(1,235)
Unamortized debt issuance costs	(4,555)
Long-term debt	$ 623,330

Derivatives and Hedging Activ_3

Derivatives and Hedging Activities (Details)	12 Months Ended
	Dec. 31, 2018USD ($)Financial_Instrument	Dec. 31, 2017USD ($)
Derivative [Line Items]
Expected amount of derivative related interest to be reclassified to interest expense over the next 12 months	$ 76,000
Interest Rate Swap [Member] | Designated as Hedging Instrument [Member] | Other Assets [Member]
Derivative [Line Items]
Derivative asset	$ 76,000	$ 1,065,000
Cash Flow Hedging [Member] | Interest Rate Swap [Member] | Designated as Hedging Instrument [Member]
Derivative [Line Items]
Number of derivative instruments held | Financial_Instrument	5
Notional amount of derivatives	$ 255,000,000
Cash Flow Hedging [Member] | Interest Rate Swap [Member] | Designated as Hedging Instrument [Member] | Interest Expense [Member]
Derivative [Line Items]
Amount of Income Recognized in OCI on Derivative (Effective Portion) December 31,	597,000	1,168,000
Amount of (Income) Loss Reclassified from Accumulated OCI into Income (Effective Portion) December 31,	$ (1,586,000)	$ 930,000

Leases (Details)

Leases (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Minimum Future Rental Receipts [Abstract]
2019	$ 270,557
2020	253,660
2021	233,192
2022	212,893
2023	211,387
Thereafter	1,619,848
Future Minimum Payments Receivable	2,801,537
Leaseholds Interests [Member]
Future Rental Payments [Abstract]
2019	3,826
2020	3,827
2021	3,769
2022	3,834
2023	4,008
Thereafter	28,326
Future Minimum Payments Due	47,590
Rent expense for leasehold interests	597	$ 690	$ 987
Corporate HQ and Office Space [Member]
Future Rental Payments [Abstract]
2019	1,295
2020	1,296
2021	1,325
2022	1,335
2023	1,304
Thereafter	2,935
Rent expense for leasehold interests	$ 1,274	$ 1,256	$ 1,242

Equity - Additional Informatio

Equity - Additional Information (Details) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Jul. 31, 2015
Equity [Line Items]
Common shares issued through public offering and direct share purchase plan during period (in shares)	0	0	577,823
Proceeds from issuance of common shares	$ (2,818,000)	$ 16,804,000	$ 12,186,000
Preferred shares outstanding (in shares)	1,935,400	1,935,400
Shares issued, net of forfeitures (in shares)	965,932	835,234	1,084,835
Unsettled repurchases	$ 2,641,000
OP unit equivalent in common shares (in unit per share)	1.13
Shares issued for units redeemed (in shares)	53,388	140,746	48,549
Partners' capital account, exchanges and conversions	$ 189,000	$ 584,000	$ 210,000
OP units outstanding (in units)	3,177,000
Common Shares [Member]
Equity [Line Items]
Number of shares authorized to be repurchased (in shares)	10,000,000			10,000,000
Repurchase of common shares (in shares)	5,851,252	0	1,184,113
Average cost per share (usd per share)	$ 8.05		$ 7.56
Series C [Member]
Equity [Line Items]
Preferred shares outstanding (in shares)	1,935,400
Dividend rate (usd per share)	$ 3.25
Preferred shares, liquidation preference	$ 96,770,000
Preferred shares to common shares conversion ratio	2.4339
Series C [Member] | Minimum [Member]
Equity [Line Items]
Common share closing price percent of conversion price	125.00%
Public Offering And Direct Share Purchase Plan Proceeds [Member]
Equity [Line Items]
Proceeds from issuance of common shares			$ 4,115,000
At The Market [Member]
Equity [Line Items]
Common shares issued through public offering and direct share purchase plan during period (in shares)	0	1,593,603	976,109
Value authorized	$ 125,000,000
Value, new issues		$ 17,362,000	$ 10,498,000

Equity - Schedule of Changes i

Equity - Schedule of Changes in AOCI (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Changes in Accumulated Other Comprehensive Income
Balance at beginning of period	$ 1,340,835	$ 1,412,491
Balance at end of period	1,346,678	1,340,835
Accumulated Other Comprehensive Income (Loss) [Member]
Changes in Accumulated Other Comprehensive Income
Balance at beginning of period	1,065	(1,033)
Balance at end of period	76	1,065
Accumulated Net Gain (Loss) from Cash Flow Hedges Including Portion Attributable to Noncontrolling Interest [Member]
Changes in Accumulated Other Comprehensive Income
Other comprehensive income before reclassifications	597	1,168
Amounts of (income) loss reclassified from accumulated other comprehensive income (loss) to interest expense	$ (1,586)	$ 930

Equity - Schedule of Effects o

Equity - Schedule of Effects of Changes in Noncontrolling Interest (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Equity [Abstract]
Net income (loss) attributable to common shareholders	$ 23,796	$ 216,190	$ (3,327)	$ (15,957)	$ 29,235	$ 3,916	$ 5,519	$ 40,397	$ 227,415	$ 85,583	$ 95,624
Increase in additional paid-in-capital for redemption of noncontrolling OP units									189	584	210
Change from net income attributable to shareholders and transfers from noncontrolling interests									$ 227,604	$ 86,167	$ 95,834

Benefit Plans - Additional Inf

Benefit Plans - Additional Information (Details) $ / shares in Units, $ in Thousands	Dec. 31, 2010$ / sharesshares	Jan. 08, 2010$ / sharesshares	Dec. 31, 2008$ / sharesshares	Dec. 31, 2018USD ($)shares	Dec. 31, 2017USD ($)shares	Dec. 31, 2016USD ($)shares
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Common share options granted (in shares)				0	0	0
Exercises in period, intrinsic value | $				$ 26	$ 1,064
Options, exercisable, intrinsic value | $				$ 91
Shares held in employee trust (in shares)				427,531	427,531
Initial vesting percentage				25.00%
Vesting percentage				100.00%
Vesting period (in years)				4 years
Cost recognized | $				$ 397	$ 439	$ 357
Allocated share-based compensation expense | $				$ 6,901	$ 8,333	$ 8,415
Options 2010 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Common share options granted (in shares)	1,248,501
Common share options exercise price (usd per share) | $ / shares	$ 7.95
Expiration period after termination (in months)				6 months
Deferred compensation equity | $				$ 2,422
Recognized compensation expense average period (in years)				5 years
Options 2010 [Member] | Share-based Compensation Award, Tranche One [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Award vesting rights, percentage	20.00%
Options 2010 [Member] | Share-based Compensation Award, Tranche Two [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Award vesting rights, percentage	20.00%
Options 2010 [Member] | Share-based Compensation Award, Tranche Three [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Award vesting rights, percentage	20.00%
Options 2010 [Member] | Share-based Compensation Award, Tranche Four [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Award vesting rights, percentage	20.00%
Options 2010 [Member] | Share-based Compensation Award, Tranche Five [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Award vesting rights, percentage	20.00%
Options 2009 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Common share options granted (in shares)		1,265,500
Common share options exercise price (usd per share) | $ / shares		$ 6.39
Expiration period after termination (in months)				6 months
Deferred compensation equity | $				$ 2,771
Recognized compensation expense average period (in years)				5 years
Options 2009 [Member] | Share-based Compensation Award, Tranche One [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Award vesting rights, percentage		20.00%
Options 2009 [Member] | Share-based Compensation Award, Tranche Two [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Award vesting rights, percentage	20.00%
Options 2009 [Member] | Share-based Compensation Award, Tranche Three [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Award vesting rights, percentage	20.00%
Options 2009 [Member] | Share-based Compensation Award, Tranche Four [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Award vesting rights, percentage	20.00%
Options 2009 [Member] | Share-based Compensation Award, Tranche Five [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Award vesting rights, percentage	20.00%
Options 2008 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Common share options granted (in shares)			2,000,000
Common share options exercise price (usd per share) | $ / shares			$ 5.60
Number of trading period days (in days)			20 days
Options convertible to common shares			1.13
Options converted to common shares exercise price (usd per share) | $ / shares			$ 4.97
Deferred compensation equity | $				$ 2,480
Recognized compensation expense average period (in years)				3 years 7 months 6 days
Options 2008 [Member] | Minimum [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Average closing price, lower limit (usd per share) | $ / shares			8
Options 2008 [Member] | Maximum [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Average closing price, lower limit (usd per share) | $ / shares			$ 10
Options 2008 [Member] | Share Based Compensation Arrangement By Share Based Payment Award Vesting Rate First Vesting Trigger [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Award vesting rights, percentage			50.00%
Non-Management Award Grant [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Shares issued for services (in shares)				66,318	57,334	50,816
Shares issued for services, value | $				$ 599	$ 596	$ 427
Non-vested Shares [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Shares issued for services (in shares)				237,570	237,560
Shares issued for services, value | $				$ 2,190	$ 2,551
Non-options, nonvested, number (in shares)				3,455,077	3,767,298	3,151,310
Number of shares available for grant (in shares)				4,012,870
Compensation cost not yet recognized | $				$ 7,915
Total compensation cost not yet recognized, period for recognition (in years)				2 years 1 month 6 days
Shares Subject to Time [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Non-options, nonvested, number (in shares)				1,495,608
Shares Subject to Performance [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Non-options, nonvested, number (in shares)				1,959,469

Benefit Plans - Assumptions Us

Benefit Plans - Assumptions Used (Details)	12 Months Ended
	Dec. 31, 2018$ / shares
Options 2010 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted-average fair value of options granted (usd per share)	$ 1.94
Weighted-average risk-free interest rate	2.54%
Weighted-average expected option lives (in years)	6 years 6 months
Weighted-average expected volatility	49.00%
Weighted-average expected dividend yield	7.40%
Options 2009 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted-average fair value of options granted (usd per share)	$ 2.19
Weighted-average risk-free interest rate	3.29%
Weighted-average expected option lives (in years)	6 years 8 months 12 days
Weighted-average expected volatility	59.08%
Weighted-average expected dividend yield	6.26%
Options 2008 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted-average fair value of options granted (usd per share)	$ 1.24
Weighted-average risk-free interest rate	1.33%
Weighted-average expected option lives (in years)	3 years 7 months 6 days
Weighted-average expected volatility	59.94%
Weighted-average expected dividend yield	14.40%

Benefit Plans - Share Option A

Benefit Plans - Share Option Activity (Details) - Share Options [Member] - $ / shares	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Number of shares outstanding, beginning (in shares)	134,790	406,241
Number of shares exercised (in shares)	(16,390)	(271,451)
Number of shares outstanding, ending (in shares)	118,400	134,790
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]
Price per share outstanding, beginning (usd per share)	$ 7.39	$ 6.78
Price per share exercised (usd per share)	6.99	6.48
Price per share outstanding, ending (usd per share)	$ 7.44	$ 7.39

Benefit Plans - Non-Vested Sha

Benefit Plans - Non-Vested Share Activity (Details) - Non-vested Shares [Member] - $ / shares	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Number of shares outstanding, beginning (in shares)	3,767,298	3,151,310
Number of shares granted (in shares)	899,614	777,900
Number of shares vested (in shares)	(618,383)	(161,912)
Number of shares forfeited (in shares)	(593,452)
Number of shares outstanding, ending (in shares)	3,455,077	3,767,298
Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
Value per share outstanding, beginning (usd per share)	$ 7.79	$ 8.09
Value per share granted (usd per share)	6.55	6.83
Value per share vested (usd per share)	9.70	8.90
Value per share forfeited (usd per share)	6.59
Value per share outstanding, ending (usd per share)	$ 7.34	$ 7.79

Benefit Plans - Shares Granted

Benefit Plans - Shares Granted to Certain Employees and Trustees (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period (in years)	5 years
Non-vested Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares issued for services (in shares)	237,570	237,560
Value per share granted (usd per share)	$ 6.55	$ 6.83
Shares issued for services, value	$ 2,190	$ 2,551
Vesting period (in years)	3 years
Number of shares vested (in shares)	618,383	161,912
Number of shares granted (in shares)	899,614	777,900
Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Measurement period (in years)	3 years
Number of shares vested (in shares)	116,926
Number of shares granted (in shares)			642,029
Share-based Compensation Award, Tranche One [Member] | Index Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares issued for services (in shares)	331,025	106,706
Value per share granted (usd per share)	$ 5.81	$ 6.82
Share-based Compensation Award, Tranche One [Member] | Peer Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares issued for services (in shares)	331,019	106,705
Value per share granted (usd per share)	$ 5.37	$ 6.34
Share-based Compensation Award, Tranche Two [Member] | Index Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares issued for services (in shares)		163,466
Value per share granted (usd per share)	$ 4.05
Share-based Compensation Award, Tranche Two [Member] | Peer Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares issued for services (in shares)		163,463
Value per share granted (usd per share)	$ 4.27

Related Party Transactions (Det

Related Party Transactions (Details) - USD ($) $ in Thousands	1 Months Ended	12 Months Ended
	Jan. 31, 2018	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Related Party Transaction [Line Items]
Rent revenue		$ 364,731	$ 359,832	$ 398,065
Vorando Realty Trust [Member]
Related Party Transaction [Line Items]
Rent revenue			234	236
Rent expense for corporate headquarters		1,192	1,179	$ 1,176
Affiliated Entity [Member]
Related Party Transaction [Line Items]
Notes payable, related parties	$ 500	$ 8,500	$ 8,000
Related party transaction, rate		0.625%
Affiliated Entity [Member] | Expense Reimbursement [Member]
Related Party Transaction [Line Items]
Expenses from transactions with related party	$ 105	$ 150
Affiliated Entity [Member] | Structuring Fee [Member]
Related Party Transaction [Line Items]
Expenses from transactions with related party		$ 128

Income Taxes - Components of I

Income Taxes - Components of Income Tax Provision (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Current:
Federal	$ (60)	$ (107)	$ (140)
State and local	(1,668)	(1,810)	(1,299)
NOL utilized	0	0	59
Deferred:
Federal	0	0	(44)
State and local	0	0	(15)
Benefit (provision) for income taxes	$ (1,728)	$ (1,917)	$ (1,439)

Income Taxes - Additional Info

Income Taxes - Additional Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
State and Local Jurisdiction [Member]
Income Taxes [Line Items]
State taxes paid	$ 1,679	$ 1,598	$ 1,252

Income Taxes - Statutory Feder

Income Taxes - Statutory Federal Income Tax (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Tax Disclosure [Abstract]
Federal provision at statutory tax rate (21% for 2018 and 34% for 2017 and 2016)	$ (65)	$ (182)	$ (154)
Federal tax rate	21.00%	34.00%	34.00%
State and local taxes, net of federal benefit	$ (11)	$ (40)	$ (30)
Other	(1,652)	(1,695)	(1,255)
Benefit (provision) for income taxes	$ (1,728)	$ (1,917)	$ (1,439)

Income Taxes - Summary of Aver

Income Taxes - Summary of Average Taxable Nature of Dividends (Details) - $ / shares	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Common [Member]
Income Tax Contingency [Line Items]
Total dividends per share, common (usd per share)	$ 0.71	$ 0.7	$ 0.685
Taxable percentage allocation on dividends	100.00%	100.00%	100.00%
Common [Member] | Ordinary Income [Member]
Income Tax Contingency [Line Items]
Taxable percentage allocation on dividends	87.89%	59.93%	96.73%
Common [Member] | 15% Rate, Qualifying Dividend [Member]
Income Tax Contingency [Line Items]
Taxable percentage allocation on dividends	0.14%	0.15%	0.22%
Common [Member] | 15% Rate Gain [Member]
Income Tax Contingency [Line Items]
Taxable percentage allocation on dividends	0.00%	0.00%	0.00%
Common [Member] | Return of Capital [Member]
Income Tax Contingency [Line Items]
Taxable percentage allocation on dividends	11.97%	39.92%	3.05%
Series C Cumulative Redeemable Preferred Shares [Member]
Income Tax Contingency [Line Items]
Total dividends per share, preferred (usd per share)	$ 3.25	$ 3.25	$ 3.25
Taxable percentage allocation on dividends	100.00%	100.00%	100.00%
Series C Cumulative Redeemable Preferred Shares [Member] | Ordinary Income [Member]
Income Tax Contingency [Line Items]
Taxable percentage allocation on dividends	99.84%	99.75%	99.78%
Series C Cumulative Redeemable Preferred Shares [Member] | 15% Rate, Qualifying Dividend [Member]
Income Tax Contingency [Line Items]
Taxable percentage allocation on dividends	0.16%	0.25%	0.22%
Series C Cumulative Redeemable Preferred Shares [Member] | 15% Rate Gain [Member]
Income Tax Contingency [Line Items]
Taxable percentage allocation on dividends	0.00%	0.00%	0.00%
Series C Cumulative Redeemable Preferred Shares [Member] | Return of Capital [Member]
Income Tax Contingency [Line Items]
Taxable percentage allocation on dividends	0.00%	0.00%	0.00%

Commitments and Contingencies (

Commitments and Contingencies (Details) - Officer [Member] $ in Thousands	12 Months Ended
	Dec. 31, 2018USD ($)retirement_agreement
Loss Contingencies [Line Items]
Number of retirement agreements | retirement_agreement	2
Maximum retirement agreement amount	$ 795
Retirement obligation earned	$ 89

Supplemental Disclosure of St_3

Supplemental Disclosure of Statement of Cash Flow Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Other Significant Noncash Transactions [Line Items]
Cash and cash equivalents at beginning of period	$ 107,762	$ 86,637	$ 93,249
Cash and cash equivalents at end of period	168,750	107,762	86,637
Restricted cash at beginning of period	4,394	31,142	10,637
Restricted cash at end of period	8,497	4,394	31,142
Cash, cash equivalents and restricted cash, at beginning of year	112,156	117,779	103,886
Cash, cash equivalents and restricted cash, at end of year	177,247	112,156	117,779
Interest paid	76,562	75,069	87,692
Income taxes paid, net	$ 2,025	2,340	1,240
Conveyed Interest [Member]
Other Significant Noncash Transactions [Line Items]
Mortgage loans on real estate, foreclosures		$ 12,616	21,582
Interests Sold [Member]
Other Significant Noncash Transactions [Line Items]
Loans assumed			$ 242,269

Unaudited Quarterly Financial_3

Unaudited Quarterly Financial Data (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Quarterly Financial Information Disclosure [Abstract]
Revenues	$ 87,251	$ 99,958	$ 105,493	$ 102,637	$ 102,169	$ 97,689	$ 95,684	$ 96,099	$ 395,339	$ 391,641	$ 429,496
Net income	25,674	220,850	(795)	(14,823)	31,448	5,596	7,365	42,220	230,906	86,629	96,450
Net income (loss) attributable to common shareholders	$ 23,796	$ 216,190	$ (3,327)	$ (15,957)	$ 29,235	$ 3,916	$ 5,519	$ 40,397	$ 227,415	$ 85,583	$ 95,624
Net income attributable to common shareholders - basic (usd per share)	$ 0.10	$ 0.91	$ (0.01)	$ (0.07)	$ 0.12	$ 0.02	$ 0.02	$ 0.17	$ 0.93	$ 0.33	$ 0.38
Net income (loss) attributable to common shareholders - per common share diluted (usd per share)	$ 0.10	$ 0.90	$ (0.01)	$ (0.07)	$ 0.12	$ 0.02	$ 0.02	$ 0.17	$ 0.93	$ 0.33	$ 0.37

Subsequent Events (Details)

Subsequent Events (Details) - Subsequent Event [Member] $ / shares in Units, $ in Thousands	2 Months Ended
	Mar. 12, 2019USD ($)property$ / sharesshares
Subsequent Event [Line Items]
Proceeds from sale of real estate	$ 79,300
Number of real estate properties acquired | property	2
Payments to acquire real estate	$ 58,000
Repurchase of common shares (in shares) | shares	441,581
Average cost per share (usd per share) | $ / shares	$ 8.13
Common stock dividends declared (usd per share) | $ / shares	$ 0.1025
Richland, Washington [Member] | Scenario, Forecast [Member]
Subsequent Event [Line Items]
Payments to acquire real estate	$ 67,000

Schedule III - Real Estate and

Schedule III - Real Estate and Accumulated Depreciation and Amortization - Schedule III (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	$ 570,420
Land and Land Estates	341,848
Buildings and Improvements	2,746,446
Total	3,090,134	$ 3,936,459	$ 3,533,172	$ 3,789,711
Accumulated Depreciation and Amortization	722,644	890,969	$ 844,931	$ 812,207
Construction in progress	1,840	$ 4,219
Unamortized debt issuance costs	$ (5,094)
Building and Improvements [Member] | Maximum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	40 years
Land Estates [Member] | Maximum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	51 years
Office Building [Member] | Glendale, Arizona [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	$ 0
Land and Land Estates	9,418
Buildings and Improvements	8,394
Total	17,812
Accumulated Depreciation and Amortization	4,229
Office Building [Member] | Tempe, Arizona [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Land and Land Estates	0
Buildings and Improvements	13,086
Total	13,086
Accumulated Depreciation and Amortization	3,035
Office Building [Member] | Tucson, Arizona [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Land and Land Estates	681
Buildings and Improvements	4,037
Total	4,718
Accumulated Depreciation and Amortization	1,103
Office Building [Member] | Palo Alto, California [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	32,188
Land and Land Estates	12,398
Buildings and Improvements	16,977
Total	29,375
Accumulated Depreciation and Amortization	23,153
Office Building [Member] | Boca Raton, Florida [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	18,785
Land and Land Estates	4,290
Buildings and Improvements	17,160
Total	21,450
Accumulated Depreciation and Amortization	6,811
Office Building [Member] | Orlando, Florida [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Land and Land Estates	3,538
Buildings and Improvements	9,353
Total	12,891
Accumulated Depreciation and Amortization	6,908
Office Building [Member] | McDonough, Georgia [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Land and Land Estates	693
Buildings and Improvements	6,405
Total	7,098
Accumulated Depreciation and Amortization	1,601
Office Building [Member] | Meridian, Idaho [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Land and Land Estates	2,255
Buildings and Improvements	8,144
Total	10,399
Accumulated Depreciation and Amortization	2,555
Office Building [Member] | Columbus, Indiana [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	7,301
Land and Land Estates	235
Buildings and Improvements	45,729
Total	45,964
Accumulated Depreciation and Amortization	37,145
Office Building [Member] | Indianapolis, Indiana [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Land and Land Estates	1,700
Buildings and Improvements	18,719
Total	20,419
Accumulated Depreciation and Amortization	14,193
Office Building [Member] | Lenexa, Kansas [Member] | Lenexa, KS Office Acquired Sep-12 [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	8,153
Land and Land Estates	2,828
Buildings and Improvements	6,075
Total	8,903
Accumulated Depreciation and Amortization	1,827
Office Building [Member] | Lenexa, Kansas [Member] | Lenexa, KS Office Acquired Jul-08 [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	31,698
Land and Land Estates	6,909
Buildings and Improvements	41,966
Total	48,875
Accumulated Depreciation and Amortization	15,556
Office Building [Member] | Baton Rouge, Louisiana [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Land and Land Estates	1,252
Buildings and Improvements	11,926
Total	13,178
Accumulated Depreciation and Amortization	5,187
Office Building [Member] | Oakland, Maine [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	8,138
Land and Land Estates	551
Buildings and Improvements	8,774
Total	9,325
Accumulated Depreciation and Amortization	2,282
Office Building [Member] | Auburn Hill, Michigan [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Land and Land Estates	4,416
Buildings and Improvements	30,012
Total	34,428
Accumulated Depreciation and Amortization	5,573
Office Building [Member] | Kansas City, Missouri [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	15,272
Land and Land Estates	1,525
Buildings and Improvements	7,691
Total	9,216
Accumulated Depreciation and Amortization	209
Office Building [Member] | Pascagoula, Mississippi [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Land and Land Estates	618
Buildings and Improvements	3,677
Total	4,295
Accumulated Depreciation and Amortization	1,009
Office Building [Member] | Wall, New Jersey [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	8,847
Land and Land Estates	8,985
Buildings and Improvements	26,961
Total	35,946
Accumulated Depreciation and Amortization	15,722
Office Building [Member] | Whippany, New Jersey [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	12,156
Land and Land Estates	4,063
Buildings and Improvements	19,711
Total	23,774
Accumulated Depreciation and Amortization	9,828
Office Building [Member] | Redmond, Oregon [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Land and Land Estates	2,064
Buildings and Improvements	8,316
Total	10,380
Accumulated Depreciation and Amortization	2,272
Office Building [Member] | Philadelphia, Pennsylvania [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Land and Land Estates	13,209
Buildings and Improvements	61,011
Total	74,220
Accumulated Depreciation and Amortization	43,083
Office Building [Member] | Florence, South Carolina [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Land and Land Estates	774
Buildings and Improvements	3,629
Total	4,403
Accumulated Depreciation and Amortization	727
Office Building [Member] | Fort Mill, South Carolina [Member] | Fort Mill, SC Office, Acquired Dec-02 [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Land and Land Estates	3,601
Buildings and Improvements	16,306
Total	19,907
Accumulated Depreciation and Amortization	6,290
Office Building [Member] | Fort Mill, South Carolina [Member] | Fort Mill, SC Office, Acquired Nov-04 [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Land and Land Estates	1,798
Buildings and Improvements	26,947
Total	28,745
Accumulated Depreciation and Amortization	19,565
Office Building [Member] | Knoxville, Tennessee [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Land and Land Estates	621
Buildings and Improvements	6,487
Total	7,108
Accumulated Depreciation and Amortization	1,643
Office Building [Member] | Arlington, Texas [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Land and Land Estates	1,274
Buildings and Improvements	15,309
Total	16,583
Accumulated Depreciation and Amortization	3,489
Office Building [Member] | Houston, Texas [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Land and Land Estates	1,875
Buildings and Improvements	10,959
Total	12,834
Accumulated Depreciation and Amortization	8,345
Office Building [Member] | Lake Jackson, Texas [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	187,980
Land and Land Estates	7,435
Buildings and Improvements	141,436
Total	148,871
Accumulated Depreciation and Amortization	12,105
Office Building [Member] | Mission, Texas [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Land and Land Estates	2,556
Buildings and Improvements	2,911
Total	5,467
Accumulated Depreciation and Amortization	1,038
Office Building [Member] | Westlake, Texas [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Land and Land Estates	2,361
Buildings and Improvements	26,631
Total	28,992
Accumulated Depreciation and Amortization	13,421
Office Building [Member] | Herndon, Virginia [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Land and Land Estates	5,127
Buildings and Improvements	25,293
Total	30,420
Accumulated Depreciation and Amortization	11,353
Office Building, Multi-tenant/vacant properties [Member] | Phoenix, Arizona [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Land and Land Estates	1,096
Buildings and Improvements	6,193
Total	7,289
Accumulated Depreciation and Amortization	229
Office Building, Multi-tenant/vacant properties [Member] | Overland Park, Kansas [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	32,112
Land and Land Estates	2,025
Buildings and Improvements	10,976
Total	13,001
Accumulated Depreciation and Amortization	4,242
Office Building, Multi-tenant/vacant properties [Member] | Charleston, South Carolina [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	6,878
Land and Land Estates	1,189
Buildings and Improvements	9,419
Total	10,608
Accumulated Depreciation and Amortization	4,651
Office Building, Multi-tenant/vacant properties [Member] | Farmers Branch, Texas [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Land and Land Estates	3,984
Buildings and Improvements	32,842
Total	36,826
Accumulated Depreciation and Amortization	14,111
Office Building, Multi-tenant/vacant properties [Member] | Houston, Texas [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Land and Land Estates	800
Buildings and Improvements	27,667
Total	28,467
Accumulated Depreciation and Amortization	21,686
Industrial Property [Member] | Anniston, Alabama [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Land and Land Estates	1,201
Buildings and Improvements	16,771
Total	17,972
Accumulated Depreciation and Amortization	3,159
Industrial Property [Member] | Moody, Alabama [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Land and Land Estates	654
Buildings and Improvements	9,943
Total	10,597
Accumulated Depreciation and Amortization	7,757
Industrial Property [Member] | Opelika, Alabama [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Land and Land Estates	134
Buildings and Improvements	31,734
Total	31,868
Accumulated Depreciation and Amortization	1,952
Industrial Property [Member] | Goodyear, Arizona [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Land and Land Estates	5,247
Buildings and Improvements	36,115
Total	41,362
Accumulated Depreciation and Amortization	138
Industrial Property [Member] | Orlando, Florida [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Land and Land Estates	1,030
Buildings and Improvements	10,869
Total	11,899
Accumulated Depreciation and Amortization	3,678
Industrial Property [Member] | Tampa, Florida [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Land and Land Estates	2,160
Buildings and Improvements	8,526
Total	10,686
Accumulated Depreciation and Amortization	6,723
Industrial Property [Member] | Lavonia, Georgia [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	6,647
Land and Land Estates	171
Buildings and Improvements	7,657
Total	7,828
Accumulated Depreciation and Amortization	1,371
Industrial Property [Member] | McDonough, Georgia [Member] | McDonough, GA Industrial Acquired Aug-17 [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Land and Land Estates	5,441
Buildings and Improvements	52,762
Total	58,203
Accumulated Depreciation and Amortization	3,101
Industrial Property [Member] | McDonough, Georgia [Member] | McDonough, GA Industrial Acquired Dec-06 [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Land and Land Estates	2,463
Buildings and Improvements	24,811
Total	27,274
Accumulated Depreciation and Amortization	7,820
Industrial Property [Member] | Thomson, Georgia [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Land and Land Estates	909
Buildings and Improvements	7,746
Total	8,655
Accumulated Depreciation and Amortization	1,368
Industrial Property [Member] | Edwardsville, Illinois [Member] | Edwardsville, IL Industrial Acquired Dec-16 [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Land and Land Estates	4,593
Buildings and Improvements	34,362
Total	38,955
Accumulated Depreciation and Amortization	2,838
Industrial Property [Member] | Edwardsville, Illinois [Member] | Edwardsville, IL Industrial Acquired Jun- 18 [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Land and Land Estates	3,649
Buildings and Improvements	41,310
Total	44,959
Accumulated Depreciation and Amortization	932
Industrial Property [Member] | Rantoul, Illinois [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Land and Land Estates	1,304
Buildings and Improvements	32,562
Total	33,866
Accumulated Depreciation and Amortization	4,473
Industrial Property [Member] | Rockford, Illinois [Member] | Rockford, IL Industrial Acquired Dec-06 [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Land and Land Estates	371
Buildings and Improvements	2,619
Total	2,990
Accumulated Depreciation and Amortization	861
Industrial Property [Member] | Rockford, Illinois [Member] | Rockford, IL Industrial Acquired Dec-06, Property 2 [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Land and Land Estates	509
Buildings and Improvements	5,289
Total	5,798
Accumulated Depreciation and Amortization	1,740
Industrial Property [Member] | Romeoville, Illinois [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Land and Land Estates	7,524
Buildings and Improvements	40,167
Total	47,691
Accumulated Depreciation and Amortization	3,458
Industrial Property [Member] | Lafayette, Indiana [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Land and Land Estates	662
Buildings and Improvements	15,578
Total	16,240
Accumulated Depreciation and Amortization	1,000
Industrial Property [Member] | Lebanon, Indiana [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Land and Land Estates	2,100
Buildings and Improvements	29,443
Total	31,543
Accumulated Depreciation and Amortization	2,317
Industrial Property [Member] | New Century, Kansas [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Land and Land Estates	0
Buildings and Improvements	13,198
Total	13,198
Accumulated Depreciation and Amortization	1,079
Industrial Property [Member] | Dry Ridge, Kentucky [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Land and Land Estates	560
Buildings and Improvements	12,553
Total	13,113
Accumulated Depreciation and Amortization	5,889
Industrial Property [Member] | Elizabethtown, Kentucky [Member] | Elizabethtown, KY Industrial Acquired Jun-05 [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Land and Land Estates	352
Buildings and Improvements	4,862
Total	5,214
Accumulated Depreciation and Amortization	2,281
Industrial Property [Member] | Elizabethtown, Kentucky [Member] | Elizabethtown, KY Industrial Acquired Jun-05, Property 2 [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Land and Land Estates	890
Buildings and Improvements	26,868
Total	27,758
Accumulated Depreciation and Amortization	12,605
Industrial Property [Member] | Hopkinsville, Kentucky [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Land and Land Estates	631
Buildings and Improvements	16,154
Total	16,785
Accumulated Depreciation and Amortization	8,063
Industrial Property [Member] | Owensboro, Kentucky [Member] | Owensboro, KY Industrial Acquired Jun-05 [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Land and Land Estates	393
Buildings and Improvements	11,956
Total	12,349
Accumulated Depreciation and Amortization	6,474
Industrial Property [Member] | Owensboro, Kentucky [Member] | Owensboro, KY Industrial Acquired Dec-06 [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Land and Land Estates	819
Buildings and Improvements	2,439
Total	3,258
Accumulated Depreciation and Amortization	1,092
Industrial Property [Member] | Shreveport, Louisiana [Member] | Shreveport, LA Industrial Acquired Mar-07 [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Land and Land Estates	860
Buildings and Improvements	21,840
Total	22,700
Accumulated Depreciation and Amortization	6,438
Industrial Property [Member] | Shreveport, Louisiana [Member] | Shreveport, LA Industrial Acquired Jun-12 [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Land and Land Estates	1,078
Buildings and Improvements	10,134
Total	11,212
Accumulated Depreciation and Amortization	2,423
Industrial Property [Member] | North Berwick, Maine [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	381
Land and Land Estates	1,383
Buildings and Improvements	35,659
Total	37,042
Accumulated Depreciation and Amortization	10,660
Industrial Property [Member] | Detroit, Michigan [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Land and Land Estates	1,133
Buildings and Improvements	25,009
Total	26,142
Accumulated Depreciation and Amortization	3,903
Industrial Property [Member] | Kalamazoo, Michigan [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Land and Land Estates	1,942
Buildings and Improvements	14,169
Total	16,111
Accumulated Depreciation and Amortization	3,606
Industrial Property [Member] | Marshall, Michigan [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Land and Land Estates	143
Buildings and Improvements	4,302
Total	4,445
Accumulated Depreciation and Amortization	2,884
Industrial Property [Member] | Plymouth, Michigan [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Land and Land Estates	2,296
Buildings and Improvements	15,795
Total	18,091
Accumulated Depreciation and Amortization	6,497
Industrial Property [Member] | Romulus, Michigan [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Land and Land Estates	2,438
Buildings and Improvements	33,786
Total	36,224
Accumulated Depreciation and Amortization	2,069
Industrial Property [Member] | Warren, Michigan [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	25,850
Land and Land Estates	972
Buildings and Improvements	42,521
Total	43,493
Accumulated Depreciation and Amortization	2,073
Industrial Property [Member] | Minneapolis, Minnesota [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Land and Land Estates	1,886
Buildings and Improvements	1,922
Total	3,808
Accumulated Depreciation and Amortization	381
Industrial Property [Member] | Byhalia, Mississippi [Member] | Byhalia, MS Industrial Property Acquired May-11 [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Land and Land Estates	1,006
Buildings and Improvements	35,795
Total	36,801
Accumulated Depreciation and Amortization	6,241
Industrial Property [Member] | Byhalia, Mississippi [Member] | Byhalia, MS Industrial Property Acquired Sep-17 [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Land and Land Estates	1,751
Buildings and Improvements	31,236
Total	32,987
Accumulated Depreciation and Amortization	2,274
Industrial Property [Member] | Canton, Mississippi [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Land and Land Estates	5,077
Buildings and Improvements	71,289
Total	76,366
Accumulated Depreciation and Amortization	12,950
Industrial Property [Member] | Olive Branch, Mississippi [Member] | Olive Branch, MS Industrial Acquired Apr- 18 [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Land and Land Estates	2,500
Buildings and Improvements	42,538
Total	45,038
Accumulated Depreciation and Amortization	1,471
Industrial Property [Member] | Olive Branch, Mississippi [Member] | Olive Branch, MS Industrial Acquired Dec- 04 [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Land and Land Estates	198
Buildings and Improvements	10,276
Total	10,474
Accumulated Depreciation and Amortization	7,539
Industrial Property [Member] | Olive Branch, Mississippi [Member] | Olive Branch, MS Industrial Acquired Apr- 18, Property 2 [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Land and Land Estates	1,958
Buildings and Improvements	38,687
Total	40,645
Accumulated Depreciation and Amortization	1,342
Industrial Property [Member] | Lumberton, North Carolina [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Land and Land Estates	405
Buildings and Improvements	12,049
Total	12,454
Accumulated Depreciation and Amortization	4,651
Industrial Property [Member] | Shelby, North Carolina [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Land and Land Estates	1,421
Buildings and Improvements	18,862
Total	20,283
Accumulated Depreciation and Amortization	5,300
Industrial Property [Member] | Statesville, North Carolina [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Land and Land Estates	891
Buildings and Improvements	16,771
Total	17,662
Accumulated Depreciation and Amortization	5,751
Industrial Property [Member] | Durham, New Hampshire [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Land and Land Estates	3,464
Buildings and Improvements	18,094
Total	21,558
Accumulated Depreciation and Amortization	7,002
Industrial Property [Member] | North Las Vegas, Nevada [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Land and Land Estates	3,244
Buildings and Improvements	21,732
Total	24,976
Accumulated Depreciation and Amortization	2,949
Industrial Property [Member] | Erwin, New York [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Land and Land Estates	1,648
Buildings and Improvements	12,514
Total	14,162
Accumulated Depreciation and Amortization	2,977
Industrial Property [Member] | Long Island City, New York [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	39,994
Land and Land Estates	0
Buildings and Improvements	42,759
Total	42,759
Accumulated Depreciation and Amortization	16,584
Industrial Property [Member] | Chillicothe, Ohio [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Land and Land Estates	735
Buildings and Improvements	9,021
Total	9,756
Accumulated Depreciation and Amortization	3,076
Industrial Property [Member] | Cincinnati, Ohio [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Land and Land Estates	1,049
Buildings and Improvements	8,784
Total	9,833
Accumulated Depreciation and Amortization	3,075
Industrial Property [Member] | Columbus, Ohio [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Land and Land Estates	1,990
Buildings and Improvements	10,767
Total	12,757
Accumulated Depreciation and Amortization	4,194
Industrial Property [Member] | Glenwillow, Ohio [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Land and Land Estates	2,228
Buildings and Improvements	24,530
Total	26,758
Accumulated Depreciation and Amortization	7,774
Industrial Property [Member] | Hebron, Ohio [Member] | Hebron, OH Industrial, Acquired Dec-97 [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Land and Land Estates	1,063
Buildings and Improvements	4,947
Total	6,010
Accumulated Depreciation and Amortization	2,013
Industrial Property [Member] | Hebron, Ohio [Member] | Hebron, OH Industrial, Acquired Dec-01 [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Land and Land Estates	1,681
Buildings and Improvements	8,179
Total	9,860
Accumulated Depreciation and Amortization	3,606
Industrial Property [Member] | Streetsboro, Ohio [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	16,565
Land and Land Estates	2,441
Buildings and Improvements	25,282
Total	27,723
Accumulated Depreciation and Amortization	9,629
Industrial Property [Member] | Wilsonville, Oregon [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Land and Land Estates	6,815
Buildings and Improvements	32,380
Total	39,195
Accumulated Depreciation and Amortization	3,188
Industrial Property [Member] | Bristol, Pennsylvania [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Land and Land Estates	2,508
Buildings and Improvements	15,863
Total	18,371
Accumulated Depreciation and Amortization	7,694
Industrial Property [Member] | Chester, South Carolina [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	6,569
Land and Land Estates	1,629
Buildings and Improvements	8,470
Total	10,099
Accumulated Depreciation and Amortization	1,959
Industrial Property [Member] | Laurens, South Carolina [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Land and Land Estates	5,552
Buildings and Improvements	21,908
Total	27,460
Accumulated Depreciation and Amortization	7,834
Industrial Property [Member] | Spartanburg, South Carolina [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Land and Land Estates	1,447
Buildings and Improvements	23,744
Total	25,191
Accumulated Depreciation and Amortization	426
Industrial Property [Member] | Cleveland, Tennessee [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Land and Land Estates	1,871
Buildings and Improvements	29,743
Total	31,614
Accumulated Depreciation and Amortization	2,163
Industrial Property [Member] | Crossville, Tennessee [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Land and Land Estates	545
Buildings and Improvements	6,999
Total	7,544
Accumulated Depreciation and Amortization	4,571
Industrial Property [Member] | Franklin, Tennessee [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Land and Land Estates	0
Buildings and Improvements	5,673
Total	5,673
Accumulated Depreciation and Amortization	3,057
Industrial Property [Member] | Jackson, Tennessee [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Land and Land Estates	1,454
Buildings and Improvements	49,026
Total	50,480
Accumulated Depreciation and Amortization	2,624
Industrial Property [Member] | Lewisburg, Tennessee [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Land and Land Estates	173
Buildings and Improvements	10,865
Total	11,038
Accumulated Depreciation and Amortization	1,583
Industrial Property [Member] | Memphis, Tennessee [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Land and Land Estates	1,054
Buildings and Improvements	11,538
Total	12,592
Accumulated Depreciation and Amortization	11,487
Industrial Property [Member] | Millington, Tennessee [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Land and Land Estates	723
Buildings and Improvements	19,383
Total	20,106
Accumulated Depreciation and Amortization	12,951
Industrial Property [Member] | Smyrna, Tennessee [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Land and Land Estates	1,793
Buildings and Improvements	93,940
Total	95,733
Accumulated Depreciation and Amortization	5,154
Industrial Property [Member] | Arlington, Texas [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Land and Land Estates	589
Buildings and Improvements	7,739
Total	8,328
Accumulated Depreciation and Amortization	1,604
Industrial Property [Member] | Brookshire, Texas [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Land and Land Estates	2,388
Buildings and Improvements	16,614
Total	19,002
Accumulated Depreciation and Amortization	2,915
Industrial Property [Member] | Carrollton, Texas [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Land and Land Estates	3,228
Buildings and Improvements	15,769
Total	18,997
Accumulated Depreciation and Amortization	330
Industrial Property [Member] | Grand Prairie, Texas [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Land and Land Estates	3,166
Buildings and Improvements	17,985
Total	21,151
Accumulated Depreciation and Amortization	1,170
Industrial Property [Member] | Houston, Texas [Member] | Houston, TX Industrial Acquired Mar-15 [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Land and Land Estates	4,674
Buildings and Improvements	19,540
Total	24,214
Accumulated Depreciation and Amortization	8,016
Industrial Property [Member] | Houston, Texas [Member] | Houston, TX Industrial Acquired Mar-13 [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Land and Land Estates	15,055
Buildings and Improvements	57,949
Total	73,004
Accumulated Depreciation and Amortization	10,371
Industrial Property [Member] | Missouri City, Texas [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Land and Land Estates	14,555
Buildings and Improvements	5,895
Total	20,450
Accumulated Depreciation and Amortization	5,615
Industrial Property [Member] | Pasadena, Texas [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Land and Land Estates	4,057
Buildings and Improvements	17,810
Total	21,867
Accumulated Depreciation and Amortization	271
Industrial Property [Member] | San Antonio, Texas [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Land and Land Estates	1,311
Buildings and Improvements	36,644
Total	37,955
Accumulated Depreciation and Amortization	2,364
Industrial Property [Member] | Chester, Virginia [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Land and Land Estates	8,544
Buildings and Improvements	53,067
Total	61,611
Accumulated Depreciation and Amortization	220
Industrial Property [Member] | Winchester, Virginia [Member] | Winchester, VA Industrial Acquired Dec-17 [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Land and Land Estates	1,988
Buildings and Improvements	32,536
Total	34,524
Accumulated Depreciation and Amortization	1,392
Industrial Property [Member] | Winchester, Virginia [Member] | Winchester, VA Industrial Acquired Jun-07 [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Land and Land Estates	3,823
Buildings and Improvements	12,276
Total	16,099
Accumulated Depreciation and Amortization	4,311
Industrial Property [Member] | Bingen, Washington [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Land and Land Estates	0
Buildings and Improvements	18,075
Total	18,075
Accumulated Depreciation and Amortization	4,269
Industrial Property [Member] | Richland, Washington [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	110,000
Land and Land Estates	1,293
Buildings and Improvements	126,947
Total	128,240
Accumulated Depreciation and Amortization	16,632
Industrial Property [Member] | Oak Creek, Wisconsin [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Land and Land Estates	3,015
Buildings and Improvements	15,300
Total	18,315
Accumulated Depreciation and Amortization	2,352
Industrial properties, Multi-tenant/vacant properties [Member] | Plymouth, Indiana [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Land and Land Estates	254
Buildings and Improvements	8,101
Total	8,355
Accumulated Depreciation and Amortization	1,816
Industrial properties, Multi-tenant/vacant properties [Member] | Henderson, North Carolina [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Land and Land Estates	1,488
Buildings and Improvements	5,953
Total	7,441
Accumulated Depreciation and Amortization	2,549
Industrial properties, Multi-tenant/vacant properties [Member] | Duncan, South Carolina [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Land and Land Estates	884
Buildings and Improvements	8,626
Total	9,510
Accumulated Depreciation and Amortization	2,604
Industrial properties, Multi-tenant/vacant properties [Member] | Antioch, Tennessee [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Land and Land Estates	3,847
Buildings and Improvements	12,659
Total	16,506
Accumulated Depreciation and Amortization	3,479
Industrial properties, Multi-tenant/vacant properties [Member] | Memphis, Tennessee [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Land and Land Estates	0
Buildings and Improvements	0
Total	0
Accumulated Depreciation and Amortization	0
Other Property [Member] | Venice, Florida [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Land and Land Estates	4,696
Buildings and Improvements	11,753
Total	16,449
Accumulated Depreciation and Amortization	9,071
Other Property [Member] | Baltimore, Maryland [Member] | Baltimore, MD Other Acquired Dec-15 [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Land and Land Estates	5,000
Buildings and Improvements	0
Total	5,000
Accumulated Depreciation and Amortization	0
Other Property [Member] | Baltimore, Maryland [Member] | Baltimore, MD Other Acquired Dec-06 [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Land and Land Estates	4,605
Buildings and Improvements	0
Total	4,605
Accumulated Depreciation and Amortization	0
Other Property [Member] | Pataskala, Ohio [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Land and Land Estates	3,605
Buildings and Improvements	0
Total	3,605
Accumulated Depreciation and Amortization	0
Other Property [Member] | Lawton, Oklahoma [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Land and Land Estates	663
Buildings and Improvements	1,288
Total	1,951
Accumulated Depreciation and Amortization	587
Other Property [Member] | Paris, Tennessee [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Land and Land Estates	247
Buildings and Improvements	547
Total	794
Accumulated Depreciation and Amortization	240
Other Property [Member] | Danville, Virginia [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Land and Land Estates	3,454
Buildings and Improvements	0
Total	3,454
Accumulated Depreciation and Amortization	0
Other properties, Multi-tenant/vacant properties [Member] | Albany, Georgia [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Land and Land Estates	455
Buildings and Improvements	1,206
Total	1,661
Accumulated Depreciation and Amortization	17
Other properties, Multi-tenant/vacant properties [Member] | Honolulu, Hawaii [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Land and Land Estates	8,259
Buildings and Improvements	7,414
Total	15,673
Accumulated Depreciation and Amortization	6,025
Other properties, Multi-tenant/vacant properties [Member] | Watertown, New York [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Land and Land Estates	270
Buildings and Improvements	2,333
Total	2,603
Accumulated Depreciation and Amortization	52
Other properties, Multi-tenant/vacant properties [Member] | Fairlea, West Virginia [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Land and Land Estates	79
Buildings and Improvements	216
Total	295
Accumulated Depreciation and Amortization	$ 4

Schedule III - Real Estate an_2

Schedule III - Real Estate and Accumulated Depreciation and Amortization - Summary (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Real Estate and Accumulated Depreciation [Line Items]
Total cost basis for federal income tax purposes	$ 3,800,000
Reconciliation of real estate owned:
Balance at the beginning of year	3,936,459	$ 3,533,172	$ 3,789,711
Additions during year	310,207	676,355	291,004
Properties sold and impaired during the year	(1,091,956)	(270,241)	(527,597)
Other reclassifications	(64,576)	(2,827)	(19,946)
Balance at end of year	3,090,134	3,936,459	3,533,172
Reconciliation of accumulated depreciation and amortization:
Balance at the beginning of year	890,969	844,931	812,207
Depreciation and amortization expense	136,571	139,493	128,384
Accumulated depreciation and amortization of properties sold, impaired and held for sale during year	(290,938)	(93,455)	(86,428)
Other reclassifications	(13,958)	0	(9,232)
Balance at end of year	$ 722,644	$ 890,969	$ 844,931