LXP Industrial Trust (LXP) 10-K 27 Feb 18 2017 FY Annual report Financial data

Document and Entity Information

Document and Entity Information - USD ($)	12 Months Ended
	Dec. 31, 2017	Feb. 22, 2018	Jun. 30, 2017
Entity Information [Line Items]
Entity Registrant Name	LEXINGTON REALTY TRUST
Entity Central Index Key	910,108
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 Public Float			$ 2,328,797,004
Entity Common Stock, Shares Outstanding (in shares)		240,767,878
Document Fiscal Year Focus	2,017
Document Fiscal Period Focus	FY
Document Type	10-K
Amendment Flag	false
Document Period Ended Date	Dec. 31, 2017
LCIF [Member]
Entity Information [Line Items]
Entity Registrant Name	LEPERCQ CORPORATE INCOME FUND L.P.
Entity Central Index Key	790,877
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	Non-accelerated Filer
Entity Public Float			$ 0
Entity Common Stock, Shares Outstanding (in shares)		0
Document Fiscal Year Focus	2,017
Document Fiscal Period Focus	FY
Document Type	10-K
Amendment Flag	false
Document Period Ended Date	Dec. 31, 2017

CONSOLIDATED BALANCE SHEETS

CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Assets:
Real estate, at cost	$ 3,936,459	$ 3,533,172
Real estate - intangible assets	599,091	597,294
Investments in real estate under construction	0	106,652
Real estate, gross	4,535,550	4,237,118
Less: accumulated depreciation and amortization	1,225,650	1,208,792
Real estate, net	3,309,900	3,028,326
Assets held for sale	2,827	23,808
Cash and cash equivalents	107,762	86,637
Restricted cash	4,394	31,142
Investment in and advances to non-consolidated entities	17,476	67,125
Deferred expenses (net of accumulated amortization)	31,693	33,360
Loans receivable, net	0	94,210
Rent receivable - current	5,450	7,516
Rent receivable – deferred	52,769	31,455
Other assets	20,749	37,888
Assets	3,553,020	3,441,467
Liabilities:
Mortgages and notes payable, net	689,810	738,047
Revolving credit facility borrowings	160,000	0
Term loans payable, net	596,663	501,093
Senior notes payable, net	495,198	494,362
Trust preferred securities, net	127,196	127,096
Dividends payable	49,504	47,264
Liabilities held for sale	0	191
Accounts payable and other liabilities	38,644	59,601
Accrued interest payable	5,378	6,704
Deferred revenue - including below market leases (net of accumulated accretion)	33,182	39,895
Prepaid rent	16,610	14,723
Total liabilities	2,212,185	2,028,976
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, 240,689,081 and 238,037,177 shares issued and outstanding in 2017 and 2016, respectively	24	24
Additional paid-in-capital	2,818,520	2,800,736
Accumulated distributions in excess of net income	(1,589,724)	(1,500,966)
Accumulated other comprehensive income (loss)	1,065	(1,033)
Total shareholders’ equity	1,323,901	1,392,777
Noncontrolling interests	16,934	19,714
Total equity	1,340,835	1,412,491
Total liabilities and equity	3,553,020	3,441,467
LCIF [Member]
Assets:
Real estate, at cost	794,242	731,202
Real estate - intangible assets	116,861	104,761
Investments in real estate under construction	0	40,443
Real estate, gross	911,103	876,406
Less: accumulated depreciation and amortization	233,121	236,930
Real estate, net	677,982	639,476
Cash and cash equivalents	50,900	52,031
Restricted cash	932	1,545
Investment in and advances to non-consolidated entities	6,477	5,526
Deferred expenses (net of accumulated amortization)	6,326	5,070
Rent receivable - current	365	358
Rent receivable – deferred	22,529	17,449
Related party advances, net	0	5,967
Other assets	2,202	1,182
Assets	767,713	728,604
Liabilities:
Mortgages and notes payable, net	212,792	169,212
Co-borrower debt	157,789	146,404
Related party advances, net	2,422	0
Dividends payable	14,952	16,916
Accounts payable and other liabilities	8,748	3,559
Accrued interest payable	691	673
Deferred revenue - including below market leases (net of accumulated accretion)	804	1,003
Prepaid rent	3,233	3,214
Total liabilities	401,431	340,981
Commitments and contingencies
Equity:
Partners' capital	366,282	387,623
Total liabilities and equity	$ 767,713	$ 728,604

CONSOLIDATED BALANCE SHEETS (Pa

CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Assets:
Accumulated amortization on deferred expenses	$ 35,072	$ 31,095
Liabilities:
Accumulated accretion on deferred revenue	$ 26,081	$ 31,309
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)	240,689,081	238,037,177
Common shares, shares outstanding (in shares)	240,689,081	238,037,177
LCIF [Member]
Assets:
Accumulated amortization on deferred expenses	$ 5,878	$ 4,910
Liabilities:
Accumulated accretion on deferred revenue	$ 355	$ 3,180
Equity:
Common shares, par value (usd per share)	$ 0.0001

CONSOLIDATED STATEMENTS OF OPER

CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Gross revenues:
Rental	$ 359,832	$ 398,065	$ 399,485
Tenant reimbursements	31,809	31,431	31,354
Total gross revenues	391,641	429,496	430,839
Expense applicable to revenues:
Depreciation and amortization	(173,968)	(166,048)	(163,198)
Property operating	(49,194)	(47,355)	(59,655)
General and administrative	(34,158)	(31,104)	(29,276)
Litigation settlement	(2,050)	0	0
Non-operating income	10,378	13,043	11,429
Interest and amortization expense	(77,883)	(88,032)	(89,739)
Debt satisfaction gains (charges), net	6,196	(975)	25,150
Impairment charges and loan losses	(44,996)	(100,236)	(36,832)
Gains on sales of properties	63,428	81,510	23,307
Income (loss) before provision for income taxes and equity in earnings of non-consolidated entities	89,394	90,299	112,025
Provision for income taxes	(1,917)	(1,439)	(568)
Equity in earnings (losses) of non-consolidated entities	(848)	7,590	1,752
Income (loss) from continuing operations	86,629	96,450	113,209
Discontinued operations:
Income from discontinued operations	0	0	109
Provision for income taxes	0	0	(4)
Gains on sales of properties	0	0	1,577
Total discontinued operations	0	0	1,682
Net income (loss)	86,629	96,450	114,891
Less net income attributable to noncontrolling interests	(1,046)	(826)	(3,188)
Net income attributable to Lexington Realty Trust shareholders	85,583	95,624	111,703
Dividends attributable to preferred shares	(6,290)	(6,290)	(6,290)
Allocation to participating securities	(226)	(225)	(313)
Net income attributable to common shareholders	$ 79,067	$ 89,109	$ 105,100
Income per common share – basic:
Income from continuing operations, basic (usd per share)	$ 0.33	$ 0.38	$ 0.44
Income from discontinued operations, basic (usd per share)	0	0	0.01
Net income attributable to common shareholders, basic (usd per share)	$ 0.33	$ 0.38	$ 0.45
Weighted-average common shares outstanding - basic (in shares)	237,758,408	233,633,058	233,455,056
Income per common share – diluted:
Income from continuing operations, diluted (usd per share)	$ 0.33	$ 0.37	$ 0.44
Income from discontinued operations, diluted (usd per share)	0	0	0.01
Net income attributable to common shareholders, diluted (usd per share)	$ 0.33	$ 0.37	$ 0.45
Weighted-average common shares outstanding (in shares)	241,537,837	237,679,031	233,751,775
Amounts attributable to common shareholders:
Income from continuing operations	$ 79,067	$ 89,109	$ 103,418
Income from discontinued operations	0	0	1,682
Net income attributable to common shareholders	79,067	89,109	105,100
LCIF [Member]
Gross revenues:
Rental	74,707	115,403	117,847
Tenant reimbursements	8,066	8,766	10,154
Total gross revenues	82,773	124,169	128,001
Expense applicable to revenues:
Depreciation and amortization	(37,266)	(34,264)	(30,651)
Property operating	(12,516)	(14,414)	(17,046)
General and administrative	(6,721)	(9,570)	(8,541)
Non-operating income	386	299	531
Interest and amortization expense	(15,969)	(27,313)	(29,269)
Debt satisfaction gains (charges), net	0	(7,388)	(33)
Impairment charges and loan losses	(12,061)	(72,072)	(787)
Gains on sales of properties	4,491	36,380	0
Income (loss) before provision for income taxes and equity in earnings of non-consolidated entities	3,117	(4,173)	42,205
Provision for income taxes	(34)	(72)	(48)
Equity in earnings (losses) of non-consolidated entities	476	324	158
Discontinued operations:
Net income (loss)	$ 3,559	$ (3,921)	$ 42,315
Amounts attributable to common shareholders:
Net income (loss) (usd per unit)	$ 0.04	$ (0.05)	$ 0.58
Weighted-average units outstanding (in units)	82,537,628	83,241,396	72,615,795

CONSOLIDATED STATEMENTS OF OPE5

CONSOLIDATED STATEMENTS OF OPERATIONS (Parentheticals)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
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, 2017	Dec. 31, 2016	Dec. 31, 2015
Statement of Comprehensive Income [Abstract]
Net Income	$ 86,629	$ 96,450	$ 114,891
Other comprehensive income (loss):
Change in unrealized gain (loss) on interest rate swaps, net	2,098	906	(2,343)
Other comprehensive income (loss)	2,098	906	(2,343)
Comprehensive income	88,727	97,356	112,548
Comprehensive income attributable to noncontrolling interests	(1,046)	(826)	(3,188)
Comprehensive income attributable to Lexington Realty Trust shareholders	$ 87,681	$ 96,530	$ 109,360

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]
Beginning balance at Dec. 31, 2014	$ 1,508,920	$ 94,016	$ 23	$ 2,763,374	$ (1,372,051)	$ 404	$ 23,154
Beginning balance (in shares) at Dec. 31, 2014		1,935,400	233,278,037
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Redemption of noncontrolling OP units for common shares				165			(165)
Redemption of noncontrolling OP units for common shares (in shares)			32,780
Repurchase of common shares	(18,431)			(18,431)
Repurchase of common shares (in shares)			(2,216,799)
Issuance of common shares upon conversion of convertible notes	3,630			3,630
Issuance of common shares upon conversion of convertible notes (in shares)			519,664
Issuance of common shares and deferred compensation amortization, net	28,099			28,099
Issuance of common shares and deferred compensation amortization, net (in shares)			2,961,543
Acquisition of consolidated joint venture partner's equity interest	(1,234)				(1,247)		13
Dividends/distributions	(171,001)				(167,313)		(3,688)
Net Income	114,891				111,703		3,188
Other comprehensive income (loss)	(2,343)					(2,343)
Ending balance at Dec. 31, 2015	1,462,531	$ 94,016	$ 23	2,776,837	(1,428,908)	(1,939)	22,502
Ending 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
Ending balance 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
Ending balance 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

CONDENSED CONSOLIDATED STATEMEN

CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN PARTNERS' CAPITAL - USD ($) $ in Thousands	Total	LCIF [Member]	LCIF [Member]General Partner [Member]
Beginning balance (in units) at Dec. 31, 2014		70,682,266
Beginning balance at Dec. 31, 2014		$ 432,041
Changes in co-borrower debt		(64,139)
Issuance of units (in units)			12,559,130
Issuance of units			$ 112,286
Distributions		(60,846)
Net Income	$ 114,891	$ 42,315
Ending balance (in units) at Dec. 31, 2015		83,241,396
Ending balance at Dec. 31, 2015		$ 461,657
Changes in co-borrower debt		(3,298)
Distributions		(66,815)
Net Income	96,450	$ (3,921)
Ending balance (in units) at Dec. 31, 2016		83,241,396
Ending balance at Dec. 31, 2016		$ 387,623
Changes in co-borrower debt		$ 168,615
Redemption of units (in units)		(2,675,785)
Redemption of units		$ (129,990)
Distributions		(63,525)
Net Income	$ 86,629	$ 3,559
Ending balance (in units) at Dec. 31, 2017	3,223,000	80,565,611
Ending balance at Dec. 31, 2017		$ 366,282

CONSOLIDATED STATEMENTS OF CASH

CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Cash flows from operating activities:
Net income (loss)	$ 86,629	$ 96,450	$ 114,891
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	177,561	170,038	167,186
Gains on sales of properties	(63,428)	(81,510)	(24,884)
Debt satisfaction gains, net	(6,305)	(3,562)	(25,240)
Impairment charges and loan losses	44,996	100,236	36,832
Straight-line rents	(19,568)	(37,445)	(46,432)
Other non-cash (income) expense, net	8,093	1,656	3,695
Equity in (earnings) losses of non-consolidated entities	848	(7,590)	(1,752)
Distributions of accumulated earnings from non-consolidated entities, net	403	815	2,056
Unearned contingent acquisition consideration	(3,922)	0	0
Deferred taxes, net	0	59	(77)
Increase (decrease) in accounts payable and other liabilities	(1,141)	(1,657)	4,314
Change in rent receivable and prepaid rent, net	2,922	(1,825)	1,967
Increase in accrued interest payable	16	808	2,438
Other adjustments, net	657	(1,200)	9,936
Net cash provided by operating activities:	227,761	235,273	244,930
Cash flows from investing activities:
Investment in real estate, including intangible assets	(558,571)	(167,797)	(349,926)
Investment in real estate under construction	(83,274)	(132,192)	(137,158)
Capital expenditures	(15,184)	(4,408)	(29,110)
Net proceeds from sale of properties	223,853	370,038	156,461
Net proceeds from sale of non-consolidated investment	6,127	0	0
Principal payments received on loans receivable	139,280	2,214	4,746
Investment in loans receivable	0	0	(10,274)
Investments in and advances to non-consolidated entities, net	(9,898)	(37,240)	(18,900)
Distributions from non-consolidated entities in excess of accumulated earnings	531	8,175	1,728
Payments of deferred leasing costs	(6,526)	(6,558)	(6,681)
Change in escrow deposits and restricted cash	23,720	(21,571)	2,745
Change in real estate deposits	20,826	(20,848)	(1,902)
Net cash used in investing activities	(259,116)	(10,187)	(388,271)
Cash flows from financing activities:
Dividends to common and preferred shareholders	(172,101)	(165,858)	(164,737)
Conversion of convertible notes	0	(672)	(529)
Principal amortization payments	(30,082)	(26,796)	(32,440)
Principal payments on debt, excluding normal amortization	(50,797)	(109,973)	(106,956)
Change in revolving credit facility borrowing, net	160,000	(177,000)	177,000
Payment of developer liabilities	0	(4,016)	0
Payments of deferred financing costs	(2,124)	(1,842)	(9,336)
Proceeds of mortgages and notes payable	45,400	254,650	190,843
Proceeds from term loans	95,000	0	0
Change in restricted cash	1,573	0	(1,573)
Cash distributions to noncontrolling interests	(3,242)	(3,404)	(3,688)
Purchase/redemption of a noncontrolling interest	(7,951)	0	(4,022)
Repurchase of common shares	0	(8,973)	(18,431)
Issuance of common shares, net	16,804	12,186	19,382
Net cash provided by (used in) financing activities	52,480	(231,698)	45,513
Change in cash and cash equivalents	21,125	(6,612)	(97,828)
Cash and cash equivalents, at beginning of year	86,637	93,249	191,077
Cash and cash equivalents, at end of year	107,762	86,637	93,249
LCIF [Member]
Cash flows from operating activities:
Net income (loss)	3,559	(3,921)	42,315
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	37,356	34,660	31,145
Gains on sales of properties	(4,491)	(36,380)	0
Debt satisfaction gains, net	0	4,733	33
Impairment charges and loan losses	12,061	72,072	787
Straight-line rents	(4,499)	(26,891)	(35,962)
Other non-cash (income) expense, net	(603)	(1,914)	(2,190)
Equity in (earnings) losses of non-consolidated entities	(476)	(324)	(158)
Distributions of accumulated earnings from non-consolidated entities, net	408	324	150
Increase (decrease) in accounts payable and other liabilities	397	(2,180)	1,129
Change in rent receivable and prepaid rent, net	12	(710)	(316)
Increase in accrued interest payable	18	(269)	(215)
Other adjustments, net	126	(293)	1,692
Net cash provided by operating activities:	43,868	38,907	38,410
Cash flows from investing activities:
Investment in real estate, including intangible assets	(71,272)	(52,700)	(152,000)
Investment in real estate under construction	(20,894)	(31,220)	(20,699)
Capital expenditures	(4,277)	(1,466)	(6,295)
Net proceeds from sale of properties	17,847	238,891	0
Principal payments received on loans receivable	0	0	3,480
Investment in loans receivable	0	0	(318)
Investments in and advances to non-consolidated entities, net	(1,737)	(81)	(1,683)
Distributions from non-consolidated entities in excess of accumulated earnings	854	478	503
Payments of deferred leasing costs	(2,474)	(1,156)	(1,553)
Real estate deposits	(40)	(28)	0
Change in escrow deposits and restricted cash	613	912	(843)
Net cash used in investing activities	(81,380)	153,630	(179,408)
Cash flows from financing activities:
Distributions to partners	(65,489)	(67,113)	(19,741)
Principal amortization payments	(1,054)	(1,311)	(1,454)
Principal payments on debt, excluding normal amortization	0	(23,934)	(28,626)
Payments of deferred financing costs	(875)	(79)	(1,281)
Proceeds of mortgages and notes payable	45,400	0	139,193
Related party note payment	0	0	(8,250)
Co-borrower debt borrowings (payments), net	180,000	(58,000)	0
Related party advances, net	8,389	(9,199)	71,959
Redemption of noncontrolling interests	(129,990)	0	0
Net cash provided by (used in) financing activities	36,381	(159,636)	151,800
Change in cash and cash equivalents	(1,131)	32,901	10,802
Cash and cash equivalents, at beginning of year	52,031	19,130	8,328
Cash and cash equivalents, at end of year	$ 50,900	$ 52,031	$ 19,130

The Company

The Company	12 Months Ended
	Dec. 31, 2017
Variable Interest Entity [Line Items]
The Company/Partnership	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, 2017 , the Company had equity ownership interests in approximately 175 consolidated properties located in 37 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.
LCIF [Member]
Variable Interest Entity [Line Items]
The Company/Partnership	The Partnership Lepercq Corporate Income Fund L.P. (together with its consolidated subsidiaries, except when the context only applies to the parent entity, the “Partnership”) was organized in 1986 as a limited partnership under the Delaware Revised Uniform Limited Partnership Act. The Partnership's sole general partner, Lex GP-1 Trust (the “General Partner”), is a wholly-owned subsidiary of Lexington Realty Trust (“Lexington”). The Partnership is an operating partnership subsidiary of Lexington. As of December 31, 2017 , Lexington, through Lex LP-1 Trust, a wholly-owned subsidiary, and the General Partner owned approximately 96.0% of the outstanding units of the Partnership. As of December 31, 2017 , the Partnership had equity ownership interests in 32 consolidated real estate properties located in 20 states. The properties in which the Partnership has an interest are primarily net-leased to tenants in various industries. A majority of the real properties in which the Partnership had an interest are generally subject to net leases or similar leases where the tenant pays all or substantially all of the cost, including cost increases, for real estate taxes, insurance, utilities and ordinary maintenance of the property. However, certain leases provide that the landlord is responsible for certain operating expenses. Property owner subsidiaries are landlords under leases for properties in which the Partnership has an interest and/or borrows under loan agreements secured by properties in which the Partnership has an interest and lender subsidiaries are lenders under loan agreements where the Partnership made an investment in a loan asset, but in all cases are separate and distinct legal entities. The assets and credit of a property owner subsidiary or lender subsidiary are not available to satisfy the debt and other obligations of any other person, including any other property owner subsidiary or lender subsidiary or any other affiliate.

Summary of Significant Accounti

Summary of Significant Accounting Policies	12 Months Ended
	Dec. 31, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
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. See the consolidated financial statements of LCIF included within this Annual Report. 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 of December 31, 2017, 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, 2017 and 2016 , 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, 2017 and 2016 : December 31, 2017 December 31, 2016 Real estate, net $ 682,587 $ 778,265 Total assets $ 766,025 $ 899,801 Mortgages and notes payable, net $ 212,792 $ 364,099 Total liabilities $ 226,331 $ 395,332 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, loans receivable and equity method investments, valuation of derivative financial instruments, valuation of 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. Gains on sales of real estate are recognized based upon the specific timing of the sale as measured against various criteria related to the terms of the transactions and any continuing involvement associated with the properties. If the sales criteria are not met, the gain is deferred and the finance, installment or cost recovery method, as appropriate, is applied until the sales criteria are met. To the extent the Company sells a property and retains a partial ownership interest in the property, the Company recognizes gain to the extent of the third-party ownership interest. Purchase Accounting and 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. Acquisition costs are expensed as incurred and are included in property operating expense in the accompanying Consolidated Statement of Operations. 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. Loans Receivable. Loans held for investment are intended to be held to maturity and, accordingly, are carried at cost, net of unamortized loan origination costs and fees, loan purchase discounts, and net of an allowance for loan losses when such loan is deemed to be impaired. Loan origination costs and fees and loan purchase discounts are amortized over the term of the loan. The Company considers a loan impaired when, based upon current information and events, it is probable that it will be unable to collect all amounts due for both principal and interest according to the contractual terms of the loan agreement. Significant judgments are required in determining whether impairment has occurred. The Company performs an impairment analysis by comparing either the present value of expected future cash flows discounted at the loan's effective interest rate, the loan's observable current market price or the fair value of the underlying collateral to the net carrying value of the loan, which may result in an allowance and corresponding loan loss charge. Interest income is recorded on a cash basis for impaired loans. 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. Commencing January 1, 2015, 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 expire 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. 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, 2017 , 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. Recently Issued Accounting Guidance. In May 2014, the FASB issued ASU 2014-09, Revenue from Contracts with Customers (Topic 606), 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 effective date of the new guidance was updated by ASU 2015-14 and is 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. The Company expects that it may be impacted upon adoption of ASU 2014-09 in its recognition of non-lease revenue, non-lease components of revenue from lease agreements (upon adoption of ASU 2016-02) and the timing of its recognition of real estate sale transactions. 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. As a result, the Company generally expects that the new guidance may result in transactions qualifying as sales of real estate at an earlier date than under current accounting guidance. The Company believes the impact would be limited to the timing and income statement presentation of revenue and not the total amount of revenue recognized over time. The Company adopted ASU 2014-09 effective January 1, 2018 using the modified retrospective approach, and, as the majority of the Company’s revenue is from rental income related to leases, the Company does not believe the ASU will have a material impact on its consolidated financial statements. 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 ASU is expected to result in the recognition of a right-to-use asset and related liability to account for the Company's future obligations under its ground lease arrangements for which the Company is the lessee. 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 an exposure draft in January 2018 (2018 Exposure Draft) which, if adopted as written, would allow 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 will require that the Company capitalize, as initial direct costs, only those costs that are incurred due to the execution of a lease. ASU 2016-02 will be 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, the 2018 Exposure Draft indicates that companies may be permitted to recognize a cumulative-effect adjustment to the opening balance of retained earnings in the period of adoption. The pronouncement allows some optional practical expedients. The Company expects to adopt this new guidance on January 1, 2019 and will continue to evaluate the impact of this guidance until it becomes effective. In March 2016, the FASB issued ASU 2016-09, Compensation-Stock Compensation-Improvements to Employee Share-Based Payment Accounting (Topic 718), which involves several aspects of the accounting for share-based payment transactions, including the income tax consequences, classification of awards as either equity or liabilities, and classification on the statement of cash flows. The Company adopted this new guidance on January 1, 2017. This new guidance did not have a material impact on the Company's consolidated financial statements. The Company has made an accounting policy election to account for share-based award forfeitures in compensation costs when they occur. 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. The ASU is effective for fiscal years beginning after December 15, 2017, including interim periods within those years; however, early adoption is permitted. Entities must apply the guidance retrospectively to all periods presented but may apply it prospectively if retrospective application would be impracticable. The Company adopted this guidance effective January 1, 2018. The Company does not believe the adoption of this guidance will have a material impact on its consolidated financial statements. 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. The ASU is effective for reporting periods beginning after December 15, 2017, with early adoption permitted, and will be applied retrospectively to all periods presented. Upon adoption, restricted cash balances will be 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. Upon adoption, separate line items showing changes in restricted cash balances will be eliminated from the Company's consolidated statement of cash flows. The Company adopted this guidance effective January 1, 2018. 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 is effective for reporting periods beginning after December 15, 2017, with early adoption permitted. 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. The Company does not believe that the adoption of this guidance will 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 ASU is effective for annual periods, and interim periods therein, beginning after December 15, 2017. The Company adopted ASU 2017-05 effective January 1, 2018 and it is not expected to have a material impact on its consolidated financial statements. 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 ASU is effective for reporting periods beginning after December 15, 2018. Early adoption is permitted. The Company is currently evaluating the impact of the adoption of the new guidance on its consolidated financial statements.
LCIF [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Summary of Significant Accounting Policies	Summary of Significant Accounting Policies Basis of Presentation and Consolidation. The Partnership'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 Partnership and its consolidated subsidiaries. The Partnership 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 Partnership is the primary beneficiary of a variable interest entity (“VIE”). Entities which the Partnership does not control and entities which are VIEs in which the Partnership is not the primary beneficiary are accounted for under appropriate GAAP. Earnings Per Unit . Net income (loss) per unit is computed by dividing net income (loss) by the weighted-average number of units outstanding during the period. There are no potential dilutive securities. Unit Redemptions . The Partnership's limited partner units that are issued and outstanding, other than those held by Lexington, are currently redeemable at certain times, only at the option of the holders, for Lexington shares of beneficial interests, par value $0.0001 per share classified as common stock (“common shares”), on a one to approximately 1.13 basis, subject to future adjustments. These units are not otherwise mandatorily redeemable by the Partnership. As of December 31, 2017 , Lexington's common shares had a closing price of $9.65 per share. The estimated fair value of these units was $35,021 , assuming all outstanding limited partner units not held by Lexington were redeemed on such date. Allocation of Overhead Expenses . The Partnership does not pay a fee to the General Partner for the day-to-day management of the Partnership. Certain expenses incurred by the General Partner and its affiliates, including Lexington, such as corporate-level interest, amortization of deferred loan costs, payroll and general and administrative expenses are allocated to the Partnership and reimbursed to the General Partner in accordance with the Partnership's partnership agreement. The allocation is based upon gross rental revenues. Distributions; Allocations of Income and Loss . As provided in the Partnership's partnership agreement, distributions and income and loss for financial reporting purposes are allocated to the partners based on their ownership of units. Special allocation rules included in the partnership agreement affect the allocation of taxable income and loss. The Partnership paid or accrued gross distributions of $63,525 ( $0.77 per weighted average unit), $66,815 ( $0.80 per weighted-average unit) and $60,846 ( $0.84 per weighted-average unit) to its partners during the years ended December 31, 2017 , 2016 and 2015 , respectively. Use of Estimates. The Partnership 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. The Partnership evaluates its estimates and assumptions on an ongoing basis using historical experience and other factors, including the economic environment. The Partnership 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, loans receivable and equity method investments and the useful lives of long-lived assets. Actual results could differ materially from those estimates. Fair Value Measurements. The Partnership 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 Partnership 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 counter-party credit risk. Revenue Recognition. The Partnership 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 Partnership funds tenant improvements and the improvements are deemed to be owned by the Partnership, 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 Partnership determines that the tenant allowances are lease incentives, the Partnership 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 Partnership 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 Partnership 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. Gains on sales of real estate are recognized based upon the specific timing of the sale as measured against various criteria related to the terms of the transactions and any continuing involvement associated with the properties. If the sales criteria are not met, the gain is deferred and the finance, installment or cost recovery method, as appropriate, is applied until the sales criteria are met. To the extent the Partnership sells a property and retains a partial ownership interest in the property, the Partnership recognizes gain to the extent of the third-party ownership interest. Purchase Accounting and 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. Acquisition costs are expensed as incurred and are included in property operating expense in the accompanying Consolidated Statement of Operations. 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. The Partnership also estimates costs to execute similar leases including leasing commissions. The Partnership's 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 the Partnership'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 are 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 Partnership generally depreciates its real estate assets over periods ranging up to 40 years. Impairment of Real Estate. The Partnership 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 the 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 Partnership accounts for its investments in 50% or less owned entities under the equity method, unless consolidation is required. If the Partnership's investment in the entity is insignificant and the Partnership 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 Partnership assesses whether there are indicators that the value of its equity method investments may be impaired. An impairment charge is recognized only if the Partnership 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 Partnership's intent and ability to recover its investment given the nature and operations of the underlying investment, 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. 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. Commencing January 1, 2015, 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. Acquisition, Development and Construction Arrangements. The Partnership evaluates loans receivable where the Partnership participates in residual profits through loan provisions or other contracts to ascertain whether the Partnership has the same risks and rewards as an owner or a joint venture partner. Where the Partnership concludes that such arrangements are more appropriately treated as an investment in real estate, the Partnership 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 Partnership records capitalized interest during the construction period. In arrangements where the Partnership engages a developer to construct a property or provide funds to a tenant to develop a property, the Partnership will capitalize the funds provided to the developer/tenant and internal costs of interest and real estate taxes, if applicable, during the construction period. Deferred Expenses. Deferred expenses consist primarily of leasing costs, which are amortized over the term of the related lease. Income Taxes. Because the Partnership is a limited partnership, taxable income or loss of the Partnership is reported in the income tax returns of its partners. Accordingly, no provision for income taxes is made in the Consolidated Financial Statements of the Partnership. However, the Partnership is required to pay certain state and local entity level taxes which are expensed as incurred. The Partnership does not have any unrecognized tax benefits or any additional tax liabilities as of December 31, 2017 and 2016 . Cash and Cash Equivalents. The Partnership 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. Co-borrower Debt. The Partnership is subject to ASC 405-40, which requires recognition of obligations as to which it is a co-borrower as the sum of (a) the amount the reporting entity agreed to pay on the basis of its arrangement among its co-obligors and (b) any additional amount the reporting entity expects to pay on behalf of its co-obligors. 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 Partnership 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 Partnership'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, 2017 , the Partnership 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 Partnership operates generally in one industry segment, single-tenant real estate assets. Recently Issued Accounting Guidance. In May 2014, the FASB issued ASU 2014-09, Revenue from Contracts with Customers (Topic 606), 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 effective date of the new guidance was updated by ASU 2015-14 and is effective for reporting periods beginning after December 15, 2017. The Partnership’s revenue-producing contracts are primarily leases that are not within the scope of this standard as leases are excluded from ASU 2014-09. The Partnership expects that it may be impacted in its recognition of non-lease revenue, non-lease components of revenue from lease agreements (upon adoption of ASU 2016-02) and the timing of its recognition of real estate sale transactions. 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. As a result, the Partnership generally expects that the new guidance may result in transactions qualifying as sales of real estate at an earlier date than under current accounting guidance. The Partnership believes the impact would be limited to the timing and income statement presentation of revenue and not the total amount of revenue recognized over time. The Partnership adopted ASU 2014-09 effective January 1, 2018 using the modified retrospective approach. As the majority of the Partnership’s revenue is from rental income related to leases, the Partnership does not believe the ASU will have a material impact on its consolidated financial statements. 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 ASU is expected to result in the recognition of a right-to-use asset and related liability to account for the Partnership's future obligations under its ground lease arrangements for which the Partnership is the lessee. From a lessor perspective, the Partnership 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 an exposure draft in January 2018 (2018 Exposure Draft) which, if adopted as written, would allow 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 will require that the Partnership capitalize, as initial direct costs, only those costs that are incurred due to the execution of a lease. ASU 2016-02 will be 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, the 2018 Exposure Draft indicates that companies may be permitted to recognize a cumulative-effect adjustment to the opening balance of retained earnings in the period of adoption. The pronouncement allows some optional practical expedients. The Partnership expects to adopt this new guidance on January 1, 2019 and will continue to evaluate the impact of this guidance until it becomes effective. 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. The ASU is effective for fiscal years beginning after December 15, 2017, including interim periods within those years; however, early adoption is permitted. Entities must apply the guidance retrospectively to all periods presented but may apply it prospectively if retrospective application would be impracticable. The Partnership adopted this guidance effective January 1, 2018. The Partnership does not believe the adoption of this guidance will have a material impact on its consolidated financial statements. 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. The ASU is effective for reporting periods beginning after December 15, 2017, with early adoption permitted, and will be applied retrospectively to all periods presented. Upon adoption, restricted cash balances will be included along with cash and cash equivalents as of the end of the period and beginning of period, respectively, in the Partnership's consolidated statement of cash flows for all periods presented. Upon adoption, separate line items showing changes in restricted cash balances will be eliminated from the Partnership's consolidated statement of cash flows. The Partnership adopted this guidance effective January 1, 2018. 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 is effective for reporting periods beginning after December 15, 2017, with early adoption permitted. The Partnership 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 Partnership adopted this guidance effective January 1, 2018. The Partnership does not believe that the adoption of this guidance will 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 Partnership to measure at fair value any retained interest in a partial sale of real estate. The ASU is effective for annual periods, and interim periods therein, beginning after December 15, 2017. The Partnership adopted ASU 2017-05 effective January 1, 2018 and it is not expected to have a material impact on its consolidated financial statements.

Earnings Per Share

Earnings Per Share	12 Months Ended
	Dec. 31, 2017
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, 2017 : 2017 2016 2015 BASIC Income from continuing operations attributable to common shareholders $ 79,067 $ 89,109 $ 103,418 Income from discontinued operations attributable to common shareholders — — 1,682 Net income attributable to common shareholders $ 79,067 $ 89,109 $ 105,100 Weighted-average number of common shares outstanding 237,758,408 233,633,058 233,455,056 Income per common share: Income from continuing operations $ 0.33 $ 0.38 $ 0.44 Income from discontinued operations — — 0.01 Net income attributable to common shareholders $ 0.33 $ 0.38 $ 0.45 2017 2016 2015 DILUTED: Income from continuing operations attributable to common shareholders $ 79,067 $ 89,109 $ 103,418 Impact of assumed conversions 147 (159 ) — Income from continuing operations attributable to common shareholders 79,214 88,950 103,418 Income from discontinued operations attributable to common shareholders — — 1,682 Impact of assumed conversions: — — — Income from discontinued operations attributable to common shareholders — — 1,682 Net income attributable to common shareholders $ 79,214 $ 88,950 $ 105,100 Weighted-average common shares outstanding - basic 237,758,408 233,633,058 233,455,056 Effect of dilutive securities: Share options 86,285 230,352 296,719 Operating Partnership Units 3,693,144 3,815,621 — Weighted-average common shares outstanding - diluted 241,537,837 237,679,031 233,751,775 Income per common share: Income from continuing operations $ 0.33 $ 0.37 $ 0.44 Income from discontinued operations — — 0.01 Net income attributable to common shareholders $ 0.33 $ 0.37 $ 0.45 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 and

Investments in Real Estate and Real Estate Under Construction	12 Months Ended
	Dec. 31, 2017
Investments in Real Estate and Real Estate Under Construction [Line Items]
Investments in Real Estate and Real Estate Under Construction	Investments in Real Estate and Real Estate Under Construction The Company's real estate, net, consists of the following at December 31, 2017 and 2016 : 2017 2016 Real estate, at cost: Buildings and building improvements $ 3,476,022 $ 3,050,082 Land, land estates and land improvements 456,134 472,394 Fixtures and equipment 84 5,577 Construction in progress 4,219 5,119 Real estate intangibles: In-place lease values 461,624 436,185 Tenant relationships 97,223 113,839 Above-market leases 40,244 47,270 Investments in real estate under construction — 106,652 4,535,550 4,237,118 Accumulated depreciation and amortization (1) (1,225,650 ) (1,208,792 ) Real estate, net $ 3,309,900 $ 3,028,326 (1) Includes accumulated amortization of real estate intangible assets of $334,681 and $363,861 in 2017 and 2016 , respectively. The estimated amortization of the above real estate intangible assets for the next five years is $31,401 in 2018 , $26,578 in 2019 , $23,360 in 2020 , $22,211 in 2021 and $20,951 in 2022 . The Company had below-market leases, net of accumulated accretion, which are included in deferred revenue, of $ 23,308 and $ 28,416 , respectively as of December 31, 2017 and 2016 . The estimated accretion for the next five years is $ 1,526 in 2018 , $ 1,261 in 2019 , $ 1,235 in 2020 , $ 1,143 in 2021 and $ 1,113 in 2022 . The Company completed the following acquisitions and build-to-suit transactions during 2017 and 2016 : 2017 : 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 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 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 (see Note 2) 2016 : Real Estate Intangibles Property Type Location Acquisition Date Initial Cost Basis Lease Expiration Land and Land Estate Building and Improvements Lease in-place Value Below Market Lease Industrial Detroit, MI January 2016 $ 29,697 10/2035 $ 1,133 $ 25,009 $ 3,555 $ — Industrial Anderson, SC June 2016 61,347 06/2036 4,663 45,011 11,673 — Industrial Wilsonville, OR September 2016 43,100 10/2032 6,815 32,380 5,920 (2,015 ) Office Lake Jackson, TX November 2016 78,484 10/2036 4,357 74,127 — — Industrial Romeoville, IL December 2016 52,700 10/2031 7,524 40,167 5,009 — Industrial Edwardsville, IL December 2016 44,800 09/2026 4,593 34,251 5,956 — $ 310,128 $ 29,085 $ 250,945 $ 32,113 $ (2,015 ) Weighted-average life of intangible assets (years) 16.6 16.1 The Company recognized aggregate acquisition and pursuit expenses of $2,171 and $836 in 2017 and 2016 , respectively, which are included in property operating expenses within the Company's Consolidated Statements of Operations. From time to time, the Company is engaged in various forms of build-to-suit development activities. As of December 31, 2017 , the Company had no development arrangements outstanding. As of December 31, 2016, the Company's aggregate investment in development arrangements was $106,652 , which included $3,442 of capitalized interest and is presented as investments in real estate under construction in the accompanying Consolidated Balance Sheets. 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.
LCIF [Member]
Investments in Real Estate and Real Estate Under Construction [Line Items]
Investments in Real Estate and Real Estate Under Construction	Investments in Real Estate and Real Estate Under Construction The Partnership's real estate, net, consists of the following at December 31, 2017 and 2016 : 2017 2016 Real estate, at cost: Buildings and building improvements $ 705,565 $ 644,173 Land, land estates and land improvements 88,589 86,120 Fixtures and equipment 84 84 Construction in progress 4 825 Real estate intangibles: In-place lease values 95,166 82,190 Tenant relationships 19,067 19,943 Above-market leases 2,628 2,628 Investment in real estate under construction — 40,443 911,103 876,406 Accumulated depreciation and amortization (1) (233,121 ) (236,930 ) Real estate, net $ 677,982 $ 639,476 (1) Includes accumulated amortization of real estate intangible assets of $54,745 and $54,425 in 2017 and 2016 , respectively. The estimated amortization of the above real estate intangible assets for the next five years is $5,307 in 2018 , $4,557 in 2019 , $4,445 in 2020 , $4,431 in 2021 and $4,431 in 2022 . In addition, the Partnership had below-market leases, net of accumulated accretion, which are included in deferred revenue, of $32 and $64 , respectively as of December 31, 2017 and 2016 . The estimated accretion for the next five years is $32 in 2018 , $0 in 2019 , $0 in 2020 , $0 in 2021 and $0 in 2022 . The Partnership, through property owner subsidiaries, completed the following build-to-suit transaction/acquisitions during 2017 : Property Type Location Acquisition Date Initial Cost Basis Lease Expiration Land Building and Improvements Lease in-place Value Intangible Office Charlotte, NC Apr-17 $ 61,339 04/2032 $ 3,771 $ 47,064 $ 10,504 Industrial Grand Prairie, TX Jun-17 24,317 03/2037 3,166 17,985 3,166 Industrial Warren, MI Nov-17 46,955 10/2032 972 42,521 3,462 $ 132,611 $ 7,909 $ 107,570 $ 17,132 Weighted-average life of intangible assets (years) 15.9 The Partnership, through property owner subsidiaries, completed the following acquisition during 2016 : Property Type Location Acquisition Date Initial Cost Basis Lease Expiration Land and Land Estates Building and Improvements Lease in-place Value Intangible Industrial Romeoville, IL Dec-16 $ 52,700 10/2031 $ 7,524 $ 40,167 $ 5,009 Life of intangible asset (years) 14.9 The Partnership recognized aggregate acquisition and pursuit expenses of $343 and $359 in 2017 and 2016 , respectively.

Property Dispositions and Real

Property Dispositions and Real Estate Impairment	12 Months Ended
	Dec. 31, 2017
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Property Dispositions and Real Estate Impairment	Property Dispositions and Real Estate Impairment For the years ended December 31, 2017 , 2016 and 2015 , the Company disposed of its interests in certain properties generating aggregate net proceeds of $223,853 , $370,038 and $156,461 , respectively, which resulted in gains on sales of $63,428 , $81,510 and $24,884 , respectively. For the years ended December 31, 2017 , 2016 and 2015 , the Company recognized net debt satisfaction gains (charges) relating to properties ultimately sold of $5,938 , $(532) and $21,498 , respectively. The results of operations for properties disposed of in 2017 and 2016 , that were not classified as held for sale as of December 31, 2015, are included within continuing operations in the consolidated financial statements. At December 31, 2017 and 2016 , the Company had one and two properties, respectively, classified as held for sale. Assets and liabilities of held for sale properties as of December 31, 2017 and 2016 consisted of the following: December 31, 2017 December 31, 2016 Assets: Real estate, at cost $ 2,827 $ 25,957 Real estate, intangible assets — 7,789 Accumulated depreciation and amortization — (13,346 ) Rent receivable - deferred — 1,715 Other — 1,693 $ 2,827 $ 23,808 Liabilities: Other $ — $ 191 $ — $ 191 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 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. As a result, during 2017 , 2016 and 2015 , the Company recognized impairment charges of $39,702 , $100,195 and $36,832 on assets that were sold, impaired prior to sale or held for use. 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.
LCIF [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Property Dispositions and Real Estate Impairment	Property Dispositions and Real Estate Impairment For the years ended December 31, 2017 and 2016 , the Partnership disposed of its interests in certain properties generating aggregate net proceeds of $17,847 and $238,891 , respectively, which resulted in gains on sales of $4,491 and $36,380 , respectively. During 2017 , 2016 and 2015, the Partnership recognized aggregate impairment charges of $5,259 , $72,072 and $787 , respectively, relating to properties that were ultimately disposed. The aggregate 2016 impairment charges related primarily to the sale of three land investments in New York, New York for $65,500 . For the year ended December 31, 2016, the Partnership recognized debt satisfaction charges, net, relating to sold properties of $7,388 . No properties were disposed of during the year ended December 31, 2015. At December 31, 2017 and 2016 , the Partnership had no properties classified as held for sale. The Partnership 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 reduction in utilization of a property, tenant financial instability 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. During 2017, the Partnership recognized an impairment charge of $6,802 on a partially vacant office property located in Florence, South Carolina.

Loans Receivable

Loans Receivable	12 Months Ended
	Dec. 31, 2017
Loans Receivable, Net [Abstract]
Loans Receivable	Loans Receivable As of December 31, 2017 , all of the Company's loans receivable were fully satisfied. As of December 31, 2016, the Company's loans receivable were comprised primarily of mortgage loans on real estate. The following is a summary of the Company's loans receivable as of December 31, 2016: Loan carrying-value (1) Loan 12/31/2016 Interest Rate Maturity Date Kennewick, WA (2) $ 85,709 9.00 % 05/2022 Oklahoma City, OK (3) 8,501 11.50 % 03/2016 $ 94,210 (1) Loan carrying value included accrued interest and was net of origination costs, if any. (2) Loan provided for a current pay rate of 8.75% , an accrual rate of 9.0% and a balloon of $87,245 at maturity. During 2017 , the loan was assigned to a third party for 94% of its principal balance. The Company recognized a $5,294 loan loss on the transaction. (3) In June 2015, the Company loaned a tenant-in-common $8,420 . The loan was secured by the tenant-in-common's interest in an office property, in which the Company had a 40% tenant-in-common interest. The loan was satisfied in full in February 2017. The Company incurred professional fees of $376 to collect this loan. Such fees are included in general and administrative expenses on the Company's Consolidated Statements of Operations for the year ended December 31, 2017 .

Fair Value Measurements

Fair Value Measurements	12 Months Ended
	Dec. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
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, 2017 and 2016 , aggregated by the level in the fair value hierarchy within which those measurements fall: 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 Fair Value Measurements Using Description 2016 (Level 1) (Level 2) (Level 3) Interest rate swap assets $ 44 $ — $ 44 $ — Impaired real estate assets* $ 15,801 $ — $ — $ 15,801 Interest rate swap liabilities $ (1,077 ) $ — $ (1,077 ) $ — *Represents a non-recurring fair value measurement determined during the respective years. The table below sets forth the carrying amounts and estimated fair values of the Company's financial instruments as of December 31, 2017 and 2016 : As of December 31, 2017 As of December 31, 2016 Carrying Amount Fair Value Carrying Amount Fair Value Assets Loans Receivable $ — $ — $ 94,210 $ 94,911 Liabilities Debt $ 2,068,867 $ 2,013,226 $ 1,860,598 $ 1,814,824 The majority of the inputs used to value the Company's interest rate swap assets (liabilities) 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 swap assets (liabilities) 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, 2017 and 2016 , the Company determined that the credit valuation adjustment relative to the overall interest rate swap assets (liabilities) is not significant. As a result, all interest rate swap assets (liabilities) 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 broker opinions of value, 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 Company estimated the fair values of its loans receivable utilizing Level 3 inputs by using an estimated discounted cash flow analysis consisting of scheduled cash flows and discount rate estimates to approximate those that a willing buyer and seller might use and/or the estimated value of the underlying collateral. 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.
LCIF [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value Measurements	Fair Value Measurements The following tables present the Partnership's assets and liabilities measured at fair value on a non-recurring basis during the year ended December 31, 2017 , aggregated by the level in the fair value hierarchy within which those measurements fall: Fair Value Measurements Using Description 2017 (Level 1) (Level 2) (Level 3) Impaired real estate asset* $ 2,090 $ — $ — $ 2,090 *Represents a non-recurring fair value measurement determined during the year. The table below sets forth the carrying amounts and estimated fair values of the Partnership's financial instruments as of December 31, 2017 and 2016 : As of December 31, 2017 As of December 31, 2016 Carrying Amount Fair Value Carrying Amount Fair Value Liabilities Debt $ 370,581 $ 352,806 $ 315,616 $ 314,509 The fair value of the Partnership's debt is primarily estimated utilizing Level 3 inputs by using an estimated discounted cash flow analysis, based upon estimates of market interest rates. The Partnership estimates the fair value of its real estate assets, including non-consolidated real estate assets, by using income and market valuation techniques. The Partnership may estimate fair values using market information such as broker opinions of value, 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 Partnership 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 Partnership 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. 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 Partnership 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, 2017
Investments in and Advances to Affiliates [Line Items]
Investment in and Advances to Non-Consolidated Entities	Investment in and Advances to Non-Consolidated Entities As of December 31, 2017 , the Company had ownership interests ranging from 15% to 25% in certain non-consolidated entities, which primarily own single-tenant net-leased assets. The acquisitions of these assets by the non-consolidated entities were partially funded through non-recourse mortgage debt with an aggregate balance of $96,603 at December 31, 2017 (the Company's proportionate share was $20,886 ). In addition, in 2017, the Company formed a non-consolidated joint venture with a developer to pursue industrial build-to-suit opportunities. The Company's initial contribution of $5,831 was used to acquire a 151 -acre parcel of developable land. 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 $1,452 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. In November 2014, the Company formed a joint venture to construct a private school in Houston, Texas. As of December 31, 2017 , the Company had a 25% equity interest in the joint venture. The joint venture completed the project during 2016 for a total construction cost of $79,964 . The Company was contractually obligated to provide construction financing to the joint venture up to $56,686 . During 2017 , the Company received $49,085 in full satisfaction of the construction financing from the proceeds of a $50,000 third-party financing. 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 $807 , $693 and $223 for the years ended December 31, 2017 , 2016 and 2015 .
LCIF [Member]
Investments in and Advances to Affiliates [Line Items]
Investment in and Advances to Non-Consolidated Entities	Investments in and Advances to Non-Consolidated Entities In July 2014, the Partnership acquired a 1.0% interest in an office property in Philadelphia, Pennsylvania for $263 . The Partnership accounts for this investment under the cost basis of accounting. On September 1, 2012, the Partnership acquired a 2% equity interest in Net Lease Strategic Assets Fund L.P. (“NLS”) for cash of $189 and the issuance of 457,211 limited partner units to Lexington. The Partnership's carrying value in NLS at December 31, 2017 and 2016 was $6,175 and $5,224 , respectively. The Partnership recognized net income from NLS of $458 , $302 and $141 in equity in earnings from non-consolidated entities during 2017 , 2016 and 2015 , respectively. The Partnership contributed $1,737 and $81 to NLS in 2017 and 2016 . In addition, the Partnership received distributions of $1,244 , $781 and $636 from NLS in 2017 , 2016 and 2015 , respectively.

Mortgages and Notes Payable

Mortgages and Notes Payable	12 Months Ended
	Dec. 31, 2017
Debt Instrument [Line Items]
Mortgages and Notes Payable	Mortgages and Notes Payable The Company had the following mortgages and notes payable outstanding as of December 31, 2017 and 2016 : December 31, 2017 December 31, 2016 Mortgages and notes payable $ 697,068 $ 745,173 Unamortized debt issuance costs (7,258 ) (7,126 ) $ 689,810 $ 738,047 Interest rates, including imputed rates on mortgages and notes payable, ranged from 2.2% to 7.8% at December 31, 2017 and the mortgages and notes payable mature between 2018 and 2036 . Interest rates, including imputed rates, ranged from 2.2% to 7.8% at December 31, 2016 . The weighted-average interest rate at December 31, 2017 and 2016 was approximately 4.6% . In 2017, the Company's unsecured credit agreement with KeyBank National Association, as agent, was amended to, among other things, increase the overall facility to $1,105,000 . With lender approval, the Company can increase the size of the amended facility to an aggregate of $2,010,000 . A summary of the significant terms are as follows: Current $505,000 Revolving Credit Facility (1) August 2019 LIBOR + 1.00% $300,000 Term Loan (2)(4) August 2020 LIBOR + 1.10% $300,000 Term Loan (3)(4) January 2021 LIBOR + 1.10% (1) Increased from $400,000 . 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, 2017 , the revolving credit facility had $160,000 borrowings outstanding and availability of $345,000 , subject to covenant compliance. (2) Increased from $250,000 . The interest rate ranges from LIBOR plus 0.90% to 1.75% . The Company has aggregate interest-rate swap agreements to fix the LIBOR component at a weighted-average rate of 1.09% through February 2018 on $250,000 of the $300,000 outstanding LIBOR-based borrowings. (3) Increased from $255,000 . The interest rate ranges from LIBOR plus 0.90% to 1.75% . The Company has 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. (4) The aggregate unamortized debt issuance costs for the term loans were $3,337 and $3,907 as of December 31, 2017 and 2016, respectively. The unsecured revolving credit facility and the unsecured term loans are subject to financial covenants, which the Company was in compliance with at December 31, 2017 . 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, credit facility borrowings and term loans for the next five years and thereafter are as follows: Year ending December 31, Total 2018 $ 35,940 2019 270,448 2020 355,147 2021 340,465 2022 30,120 Thereafter 424,948 1,457,068 Unamortized debt discounts (10,595 ) $ 1,446,473 Included in the Consolidated Statements of Operations, the Company recognized debt satisfaction gains (charges), net, of $258 , $(7) and $4,128 for the years ended December 31, 2017 , 2016 and 2015 , respectively, due to the satisfaction of mortgages and notes payable other than those disclosed elsewhere in these financial statements. In addition, the Company capitalized $1,174 , $4,933 and $6,062 in interest for the years ended 2017 , 2016 and 2015 , respectively. Senior Notes, Convertible Notes and Trust Preferred Securities The Company had the following Senior Notes outstanding as of December 31, 2017 and 2016 : Issue Date December 31, 2017 December 31, 2016 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 (1,507 ) (1,780 ) Unamortized debt issuance cost (3,295 ) (3,858 ) $ 495,198 $ 494,362 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 and 2015 , $12,400 and $3,828 aggregate principal amount of the notes were converted for 1,892,269 and 519,664 common shares and an aggregate cash payment of $672 and $529 plus accrued and unpaid interest, respectively. The Company recognized aggregate debt satisfaction charges of $436 and $476 , during 2016 and 2015 , respectively, 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, 2017 was 3.078% . As of December 31, 2017 and 2016, there was $129,120 original principal amount of Trust Preferred Securities outstanding and $1,924 and $2,024 , 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 2018 $ — 2019 — 2020 — 2021 — 2022 — Thereafter 629,120 629,120 Unamortized debt discounts (1,507 ) Unamortized debt issuance costs (5,219 ) $ 622,394
LCIF [Member]
Debt Instrument [Line Items]
Mortgages and Notes Payable	Mortgages and Notes Payable and Co-Borrower Debt The Partnership had the following mortgages and notes payable outstanding as of December 31, 2017 and 2016 : December 31, 2017 December 31, 2016 Mortgages and notes payable $ 214,303 $ 169,958 Unamortized debt issuance costs (1,511 ) (746 ) $ 212,792 $ 169,212 Interest rates, including imputed rates, ranged from 4.0% to 6.5% at December 31, 2017 and the mortgages and notes payable mature between 2019 and 2033. Interest rates, including imputed rates, ranged from 4.0% to 6.5% at December 31, 2016 . The weighted-average interest rate at December 31, 2017 and 2016 was approximately 4.8% and 4.7% , respectively. Lexington's, and the Partnership's as co-borrower, unsecured credit agreement with KeyBank National Association, as agent, was amended in 2017 to, among other things, increase the overall facility to $1,105,000 . With lender approval, Lexington can increase the size of the amended facility to an aggregate $2,010,000 . A summary of the significant terms are as follows: Maturity Date Current $505,000 Revolving Credit Facility (1) August 2019 LIBOR + 1.00% $300,000 Term Loan (2) August 2020 LIBOR + 1.10% $300,000 Term Loan (3) January 2021 LIBOR + 1.10% (1) Increased from $400,000 . Maturity date can be extended to August 2020 at the Lexington's option. The interest rate ranges from LIBOR plus 0.85% to 1.55% . At December 31, 2017 , the revolving credit facility had $160,000 of borrowings outstanding and availability of $345,000 subject to covenant compliance. (2) Increased from $250,000 . The interest rate ranges from LIBOR plus 0.90% to 1.75% . Interest-rate swap agreements exist to fix the LIBOR component at a weighted-average rate of 1.09% through February 2018 on $250,000 of the $300,000 outstanding LIBOR-based borrowings. (3) Increased from $255,000 . The interest rate ranges from LIBOR plus 0.90% to 1.75% . Interest-rate swap agreements exist 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. The unsecured revolving credit facility and the unsecured term loans are subject to financial covenants, which Lexington was in compliance with at December 31, 2017 . In accordance with the guidance of ASU 2013-04, the Partnership recognizes a proportion of the outstanding amounts of the above mentioned term loans and revolving credit facility as it is a co-borrower with Lexington, as co-borrower debt in the accompanying balances sheets. In accordance with the Partnership’s partnership agreement, the Partnership is allocated a portion of these debts based on gross rental revenues, which represents its agreed to obligation. The Partnership's allocated co-borrower debt was $157,789 and $146,404 as of December 31, 2017 and 2016 , respectively. Changes in co-borrower debt are recognized in partners’ capital, exclusive of direct borrowings/payments, in the accompanying consolidated statements of changes in partners’ capital. 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. In addition, certain mortgages are cross-collateralized and cross-defaulted. Scheduled principal and balloon payments for mortgages and notes payable and co-borrower debt for the next five years and thereafter are as follows: Year ending December 31, Total 2018 $ 1,124 2019 65,767 2020 80,875 2021 70,864 2022 10,016 Thereafter 143,446 $ 372,092 Unamortized debt issuance costs (1,511 ) $ 370,581 Included in the Consolidated Statements of Operations, the Partnership recognized debt satisfaction charges, net of $33 for the year ended 2015 due to the satisfaction of mortgages and notes payable. In addition, the Partnership capitalized $596 , $954 and $152 in interest for the years ended 2017 , 2016 , and 2015 , respectively.

Senior Notes, Convertible Notes

Senior Notes, Convertible Notes and Trust Preferred Securities	12 Months Ended
	Dec. 31, 2017
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, 2017 and 2016 : December 31, 2017 December 31, 2016 Mortgages and notes payable $ 697,068 $ 745,173 Unamortized debt issuance costs (7,258 ) (7,126 ) $ 689,810 $ 738,047 Interest rates, including imputed rates on mortgages and notes payable, ranged from 2.2% to 7.8% at December 31, 2017 and the mortgages and notes payable mature between 2018 and 2036 . Interest rates, including imputed rates, ranged from 2.2% to 7.8% at December 31, 2016 . The weighted-average interest rate at December 31, 2017 and 2016 was approximately 4.6% . In 2017, the Company's unsecured credit agreement with KeyBank National Association, as agent, was amended to, among other things, increase the overall facility to $1,105,000 . With lender approval, the Company can increase the size of the amended facility to an aggregate of $2,010,000 . A summary of the significant terms are as follows: Current $505,000 Revolving Credit Facility (1) August 2019 LIBOR + 1.00% $300,000 Term Loan (2)(4) August 2020 LIBOR + 1.10% $300,000 Term Loan (3)(4) January 2021 LIBOR + 1.10% (1) Increased from $400,000 . 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, 2017 , the revolving credit facility had $160,000 borrowings outstanding and availability of $345,000 , subject to covenant compliance. (2) Increased from $250,000 . The interest rate ranges from LIBOR plus 0.90% to 1.75% . The Company has aggregate interest-rate swap agreements to fix the LIBOR component at a weighted-average rate of 1.09% through February 2018 on $250,000 of the $300,000 outstanding LIBOR-based borrowings. (3) Increased from $255,000 . The interest rate ranges from LIBOR plus 0.90% to 1.75% . The Company has 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. (4) The aggregate unamortized debt issuance costs for the term loans were $3,337 and $3,907 as of December 31, 2017 and 2016, respectively. The unsecured revolving credit facility and the unsecured term loans are subject to financial covenants, which the Company was in compliance with at December 31, 2017 . 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, credit facility borrowings and term loans for the next five years and thereafter are as follows: Year ending December 31, Total 2018 $ 35,940 2019 270,448 2020 355,147 2021 340,465 2022 30,120 Thereafter 424,948 1,457,068 Unamortized debt discounts (10,595 ) $ 1,446,473 Included in the Consolidated Statements of Operations, the Company recognized debt satisfaction gains (charges), net, of $258 , $(7) and $4,128 for the years ended December 31, 2017 , 2016 and 2015 , respectively, due to the satisfaction of mortgages and notes payable other than those disclosed elsewhere in these financial statements. In addition, the Company capitalized $1,174 , $4,933 and $6,062 in interest for the years ended 2017 , 2016 and 2015 , respectively. Senior Notes, Convertible Notes and Trust Preferred Securities The Company had the following Senior Notes outstanding as of December 31, 2017 and 2016 : Issue Date December 31, 2017 December 31, 2016 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 (1,507 ) (1,780 ) Unamortized debt issuance cost (3,295 ) (3,858 ) $ 495,198 $ 494,362 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 and 2015 , $12,400 and $3,828 aggregate principal amount of the notes were converted for 1,892,269 and 519,664 common shares and an aggregate cash payment of $672 and $529 plus accrued and unpaid interest, respectively. The Company recognized aggregate debt satisfaction charges of $436 and $476 , during 2016 and 2015 , respectively, 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, 2017 was 3.078% . As of December 31, 2017 and 2016, there was $129,120 original principal amount of Trust Preferred Securities outstanding and $1,924 and $2,024 , 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 2018 $ — 2019 — 2020 — 2021 — 2022 — Thereafter 629,120 629,120 Unamortized debt discounts (1,507 ) Unamortized debt issuance costs (5,219 ) $ 622,394

Derivatives and Hedging Activit

Derivatives and Hedging Activities	12 Months Ended
	Dec. 31, 2017
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 2017 , 2016 and 2015 . 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 $505,000 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 $505,000 term loans. During the next 12 months, the Company estimates that an additional $1,023 will be reclassified as a decrease to interest expense if the swaps remain outstanding. As of December 31, 2017 , 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 10 $505,000 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, 2017 and 2016 . As of December 31, 2017 As of December 31, 2016 Balance Sheet Location Fair Value Balance Sheet Location Fair Value Derivatives designated as hedging instruments: Interest Rate Swap Asset Other Assets $ 1,065 Other Assets $ 44 Interest Rate Swap Liability Accounts Payable and Other Liabilities $ — Accounts Payable and Other Liabilities $ (1,077 ) The tables below present the effect of the Company's derivative financial instruments on the Consolidated Statements of Operations for 2017 and 2016 : Derivatives in Cash Flow Amount of Loss Recognized Location of Loss Reclassified from Accumulated OCI into Income (Effective Portion) Amount of Loss Reclassified Hedging Relationships 2017 2016 2017 2016 Interest Rate Swap $ 1,168 $ (3,084 ) Interest expense $ 930 $ 3,990 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, 2017 , the Company had not posted any collateral related to the agreements.

Leases

Leases	12 Months Ended
	Dec. 31, 2017
Operating Leased Assets [Line Items]
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 2018 $ 354,240 2019 333,463 2020 304,651 2021 284,114 2022 265,346 Thereafter 2,114,450 $ 3,656,264 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 2018 $ 4,330 2019 3,887 2020 3,886 2021 3,829 2022 3,893 Thereafter 28,727 $ 48,552 Rent expense for the leasehold interests was $690 , $987 and $868 in 2017 , 2016 and 2015 , 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 $1,298 for 2018 , $1,294 for 2019 , $1,297 for 2020 , $1,325 for 2021 and $1,336 for 2022 and $4,238 thereafter. Rent expense for 2017 , 2016 and 2015 was $1,256 , $1,242 and $1,435 , respectively.
LCIF [Member]
Operating Leased Assets [Line Items]
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 2018 $ 73,224 2019 68,794 2020 63,719 2021 59,332 2022 54,811 Thereafter 534,397 $ 854,277 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 Partnership held, and may in the future hold, 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 Partnership as additional rent. As of December 31, 2017 , the Partnership had no leasehold interests. Rent expense for the leasehold interests was $171 , $286 and $307 in 2017 , 2016 , and 2015 , respectively.

Concentration of Risk

Concentration of Risk	12 Months Ended
	Dec. 31, 2017
Concentration Risk [Line Items]
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, 2017 , 2016 and 2015 , 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.
LCIF [Member]
Concentration Risk [Line Items]
Concentration of Risk	Concentration of Risk The Partnership 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, 2017 , 2016 , and 2015 , the following tenants represented greater than 10% of rental revenues: 2017 2016 2015 SM Ascott LLC (1) — % 11.2 % 14.7 % Tribeca Ascott LLC (1) — % — % 12.6 % AL-Stone Ground Tenant LLC (1) — % — % 11.5 % Preferred Freezer Services of Richland, LLC 17.6 % 11.4 % — % (1) The Partnership net leased individual land parcels to the tenants listed above under non-cancellable 99 -year (original term) leases. The improvements on these parcels are owned by the tenants and consist of three high-rise hotels located in New York, NY. The Partnership sold these assets in September 2016. Cash and cash equivalent balances at certain institutions may exceed insurable amounts. The Partnership believes it mitigates this risk by investing in or through major financial institutions.

Equity

Equity	12 Months Ended
	Dec. 31, 2017
Equity [Abstract]
Equity	Equity Shareholders' Equity: During 2016 and 2015 , the Company issued 577,823 and 2,266,191 common shares, respectively, under its direct share purchase plan, which includes a dividend reinvestment component, raising net proceeds of approximately $4,115 and $20,797 respectively. In 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 2015. 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, 2017 . 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, 2017 , each share is currently 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 2017 , 2016 and 2015 , the Company issued 835,234 , 1,084,835 and 860,730 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 15). In July 2015, the Company's Board of Trustees authorized the repurchase of up to 10,000,000 common shares. This share repurchase program has no expiration date. During 2016 , the Company repurchased 1,184,113 common shares at an average gross price of $7.56 per common share under this share repurchase program. No shares were repurchased in 2017. 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, 2017 2016 Balance at beginning of period $ (1,033 ) (1,939 ) Other comprehensive income (loss) before reclassifications 1,168 (3,084 ) Amounts of loss reclassified from accumulated other comprehensive income to interest expense 930 3,990 Balance at end of period $ 1,065 (1,033 ) 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 2017 , 2016 and 2015 , 140,746 , 48,549 and 32,780 common shares, respectively, were issued by the Company, in connection with OP unit redemptions, for an aggregate value of $584 , $210 and $165 , respectively. As of December 31, 2017 , there were approximately 3,223,000 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 2017 2016 2015 Net income attributable to Lexington Realty Trust shareholders $ 85,583 $ 95,624 $ 111,703 Transfers from noncontrolling interests: Increase in additional paid-in-capital for redemption of noncontrolling OP units 584 210 165 Change from net income attributable to shareholders and transfers from noncontrolling interests $ 86,167 $ 95,834 $ 111,868 In July 2015, the Company acquired a consolidated joint venture partner's interest in an office property in Philadelphia, Pennsylvania for $4,022 raising the Company's equity ownership in the office property to 100.0% .

Benefit Plans

Benefit Plans	12 Months Ended
	Dec. 31, 2017
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 2017 , 2016 and 2015 . 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) terminate 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 is 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. No options were exercised in 2015 and the total intrinsic value of options exercised for the years ended December 31, 2017 and 2016 were $1,064 and $2,856 , respectively. Share option activity during the years indicated is as follows: Number of Shares Weighted-Average Exercise Price Per Share Balance at December 31, 2014 and 2015 1,350,410 $ 7.05 Exercised (944,169 ) 7.17 Balance at December 31, 2016 406,241 6.78 Exercised (271,451 ) 6.48 Balance at December 31, 2017 134,790 $ 7.39 As of December 31, 2017 , the aggregate intrinsic value of options that were outstanding and exercisable was $305 . Non-vested share activity for the years ended December 31, 2017 and 2016 , is as follows: Number of Shares Weighted-Average Value Per Share Balance at December 31, 2015 2,369,350 $ 9.55 Granted 1,034,019 5.23 Vested (252,059 ) 10.13 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 During 2017 and 2016 , the Company granted common shares to certain employees and trustees as follows: 2017 2016 Performance Shares (1) Shares issued: Index - 1Q 106,706 404,466 Peer - 1Q 106,705 404,463 Index - 2Q 163,466 — Peer - 2Q 163,463 — Grant date fair value per share: (2) Index - 1Q $6.82 $4.53 Peer - 1Q $6.34 $4.58 Index - 2Q $4.05 $— Peer - 2Q $4.27 $— Non-Vested Common Shares: (3) Shares issued 237,560 225,090 Grant date fair value $2,551 $1,724 (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. The 2Q shares were subject to shareholder approval, which was obtained in May 2017. (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 2017 , 2016 and 2015 , the Company issued 57,334 , 50,816 , and 48,051 , respectively, of fully vested common shares to non-management members of the Company's Board of Trustees with a fair value of $596 , $427 , and $468 , respectively. As of December 31, 2017 , of the remaining 3,767,298 non-vested shares, 1,769,503 are subject to time-based vesting and 1,997,795 are subject to performance-based vesting. At December 31, 2017 , there are 4,978,802 awards available for grant. The Company has $8,707 in unrecognized compensation costs relating to the non-vested shares that will be charged to compensation expense over an average of approximately 2.5 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, 2017 and 2016 , 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 $439 , $357 and $333 of contributions are applicable to 2017 , 2016 and 2015 , respectively. During 2017 , 2016 and 2015 , the Company recognized $8,333 , $8,415 and $8,201 , respectively, in expense relating to scheduled vesting and issuance of common share grants.

Related Party Transactions

Related Party Transactions	12 Months Ended
	Dec. 31, 2017
Related Party Transaction [Line Items]
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 acquisitions, sales and loans are approved by the independent members of the Company's Board of Trustees or the Audit Committee. The Company leased a property to an entity in which VNO, a significant shareholder, has an interest. During 2017 , 2016 and 2015 , the Company recognized $234 , $236 and $255 , 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 $1,179 , $1,176 and $1,323 in 2017 , 2016 and 2015 , 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 provides 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 addition, 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 owned by LCIF. The Company reimbursed the Chairman's affiliate approximately $105 for its expenses and paid a $120 structuring fee to the Chairman's affiliate. The loan may be increased to $12,000 upon certain events.
LCIF [Member]
Related Party Transaction [Line Items]
Related Party Transactions	Related Party Transactions The Partnership had the following related party transactions in addition to related party transactions discussed elsewhere in this report. The Partnership had outstanding net advances owed from/(to) Lexington of $(2,422) and $5,967 as of December 31, 2017 and 2016 , respectively. The advances are receivable/payable on demand. Lexington distributions were $61,072 , $64,319 and $58,361 during 2017 , 2016 and 2015 , respectively. In 2017, the Partnership redeemed 2,675,785 OP units owned by Lexington that were entitled to aggregate annual distributions of $3.25 per unit for $129,990 . During 2015 , the Partnership issued 12,559,130 units to Lexington to satisfy $112,286 of outstanding distributions and advances. The Partnership was allocated interest and amortization expense by Lexington, in accordance with the Partnership agreement, relating to certain of its lending facilities of $8,237 , $11,392 and $12,253 for the years ended December 31, 2017 , 2016 and 2015 , respectively. Lexington, on behalf of the General Partner, pays for certain general administrative and other costs on behalf of the Partnership from time to time. These costs are reimbursable by the Partnership. These costs were approximately $6,557 , $9,767 and $8,618 for 2017 , 2016 and 2015 , respectively. A Lexington affiliate provides property management services for certain Partnership properties. The Partnership recognized property operating expenses of $672 , $764 and $905 for the years ended December 31, 2017 , 2016 and 2015 , respectively, for aggregate fees and reimbursements charged by the affiliate. The Partnership leased a property to an entity in which Vornado Realty Trust, a significant Lexington shareholder, has an interest. During 2017 , 2016 and 2015 , the Partnership recognized $234 , $236 and $255 , respectively, in rental revenue from this property. In addition, the Partnership obtained non-recourse mezzanine financing in the initial amount of $8,000 from an affiliate of Lexington's Chairman, who is also the holder of the most OP units other than Lexington, pursuant to the terms of the EB-5 visa program administered by the USCIS, for an investment in Charlotte, North Carolina. The Partnership reimbursed the Chairman's affiliate approximately $105 for its expenses and paid the Chairman's affiliate a $120 structuring fee. The loan may be increased to $12,000 upon certain events.

Income Taxes

Income Taxes	12 Months Ended
	Dec. 31, 2017
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, 2017 , 2016 and 2015 is summarized as follows: 2017 2016 2015 Current: Federal $ (107 ) $ (140 ) $ — State and local (1,810 ) (1,299 ) (645 ) NOL utilized — 59 — Deferred: Federal — (44 ) 59 State and local — (15 ) 18 $ (1,917 ) $ (1,439 ) $ (568 ) The income tax provision differs from the amount computed by applying the statutory federal income tax rate to pre-tax operating income as follows: 2017 2016 2015 Federal provision at statutory tax rate (34%) $ (182 ) $ (154 ) $ 65 State and local taxes, net of federal benefit (40 ) (30 ) 12 Other (1,695 ) (1,255 ) (645 ) $ (1,917 ) $ (1,439 ) $ (568 ) For the years ended December 31, 2017 , 2016 and 2015 , the “other” amount is comprised primarily of state franchise taxes of $1,598 , $1,252 and $679 , 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, 2017 , is as follows: 2017 2016 2015 Total dividends per share $ 0.700 $ 0.685 $ 0.68 Ordinary income 59.93 % 96.73 % 63.07 % Qualifying dividend 0.15 % 0.22 % — Capital gain — — — Return of capital 39.92 % 3.05 % 36.93 % 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, 2017 , is as follows: 2017 2016 2015 Total dividends per share $ 3.25 $ 3.25 $ 3.25 Ordinary income 99.75 % 99.78 % 100.00 % Qualifying dividend 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, 2017
Commitments and Contingencies [Line Items]
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. GSMSC II 2006-GG6 Bridgewater Hills Corporate Center, LLC v. Lexington Realty Trust (Supreme Court of the State of New York, County of New York-Index No. 653117/2015) On September 16, 2015, GSMSC II 2006-GG6 Bridgewater Hills Corporate Center, LLC commenced an action as lender against the Company based on a limited guaranty of recourse obligations executed by a predecessor entity of the Company in connection with a mortgage loan secured by a property owner subsidiary's commercial property in Bridgewater, New Jersey. The property owner subsidiary defaulted due to non-payment after the sole tenant vacated at the end of the lease term. The lender claimed approximately $9,200 in order to satisfy the outstanding amount of the loan, plus interest, reasonable attorney’s fees and other costs and disbursements related thereto. The lender claimed that the Company's limited guaranty was triggered due to the merger of Newkirk Realty Trust, Inc. and Lexington Corporate Properties Trust on December 31, 2006, arguing that it constituted an event of default because it was a transfer that was not permitted by the loan agreement. The limited guaranty provided that the guarantor's liability for the guaranteed obligations shall not exceed $10,000 . The Company filed a motion to dismiss, which was generally denied. The parties conducted discovery consisting of document production. A mediation was held on October 5, 2017. As a result of discussions, following the mediation, a settlement agreement was executed and the Company made a $2,050 payment in full settlement of the lender's claims. The action was subsequently dismissed. The lender also brought a foreclosure action against the property owner subsidiary. A foreclosure sale was held September 13, 2016 and the lender acquired the property for a nominal amount. During 2017, the Company incurred $2,255 in legal costs relating to this litigation, which are included in general and administrative expense on the Company's consolidated statement of operations. Other . As of December 31, 2017, four of the Company's executive officers had employment contracts and were entitled to severance benefits upon termination by the Company without cause or termination by the executive officer with good reason, in each case, as defined in the employment contract. The employment agreements expired in January 2018. In January 2018, the Company adopted 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 substantially similar events. Also, in January 2018, the Company entered into retirement agreements with two of the four executive officers that had employment contracts. One of the retirement agreements provides for contingent payments, not to exceed $795 , in future years upon the receipt of certain incentive fees by the Company, if any.
LCIF [Member]
Commitments and Contingencies [Line Items]
Commitments and Contingencies	Commitments and Contingencies In addition to the commitments and contingencies disclosed elsewhere, the Partnership has the following commitments and contingencies. The Partnership 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 Partnership, 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 Partnership and Lexington are parties to a funding agreement under which Lexington may be required to fund distributions made on account of OP units. Pursuant to the funding agreement, the parties agreed that, if the Partnership 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 the Partnership and will bear interest at prevailing rates as determined by Lexington in its discretion, but no less than the applicable federal rate. The Partnership's right to receive these loans will expire if no OP units remain outstanding and all such loans repaid. No amounts have been advanced under this agreement. From time to time, the Partnership is directly or indirectly involved in legal proceedings arising in the ordinary course of the Partnership's business. The Partnership 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 Partnership's business, financial condition and results of operations. In May 2014, the Partnership guaranteed $250,000 aggregate principal amount of 4.40% Senior Notes due 2024 (“2024 Senior Notes”) issued by Lexington at an issuance price of 99.883% of the principal amount and in June 2013, the Partnership guaranteed $250,000 aggregate principal amount of 4.25% Senior Notes due 2023 (“2023 Senior Notes”) issued by Lexington at an issuance price of 99.026% of the principal amount, collectively the Senior Notes. The Senior Notes are unsecured, pay interest semi-annually in arrears and mature in June 2024 and 2023, respectively. Lexington 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.

Supplemental Disclosure of Stat

Supplemental Disclosure of Statement of Cash Flow Information	12 Months Ended
	Dec. 31, 2017
Condensed Cash Flow Statements, Captions [Line Items]
Supplemental Disclosure of Statement of Cash Flow Information	Supplemental Disclosure of Statement of Cash Flow Information In addition to disclosures discussed elsewhere, during 2017 , 2016 and 2015 , the Company paid $75,069 , $87,692 and $88,725 , respectively, for interest and $2,340 , $1,240 and $741 , respectively, for income taxes. During 2017 , 2016 and 2015 , the Company conveyed its interests in certain properties to its lenders in full satisfaction of the $12,616 , $21,582 and $47,528 , respectively, non-recourse mortgage notes payable. In addition, during 2016 and 2015 , 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 and $55,000 , respectively.
LCIF [Member]
Condensed Cash Flow Statements, Captions [Line Items]
Supplemental Disclosure of Statement of Cash Flow Information	Supplemental Disclosure of Statement of Cash Flow Information In addition to disclosures discussed elsewhere, during 2017 , 2016 and 2015 , the Partnership paid $15,846 , $27,262 and $28,191 , respectively, for interest and $119 , $34 and $60 , respectively, for income taxes. During 2016, the Partnership 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, 2017
Condensed Income Statements, Captions [Line Items]
Unaudited Quarterly Financial Data	Unaudited Quarterly Financial Data 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 3/31/2016 6/30/2016 9/30/2016 12/31/2016 Total gross revenues $ 111,277 $ 116,912 $ 105,981 $ 95,326 Net income (loss) $ 50,453 $ 56,680 $ (27,612 ) $ 16,929 Net income (loss) attributable to common shareholders $ 47,781 $ 53,875 $ (26,975 ) $ 14,391 Net income (loss) attributable to common shareholders - basic per share $ 0.21 $ 0.23 $ (0.12 ) $ 0.06 Net income (loss) attributable to common shareholders - diluted per share $ 0.20 $ 0.23 $ (0.12 ) $ 0.06 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.
LCIF [Member]
Condensed Income Statements, Captions [Line Items]
Unaudited Quarterly Financial Data	Unaudited Quarterly Financial Data 3/31/2017 6/30/2017 9/30/2017 12/31/2017 Total gross revenues $ 19,281 $ 20,646 $ 21,242 $ 21,604 Net income (loss) $ (470 ) $ (8 ) $ (4,422 ) $ 8,459 Net income (loss) per unit $ (0.01 ) $ — $ (0.05 ) $ 0.11 3/31/2016 6/30/2016 9/30/2016 12/31/2016 Total gross revenues $ 34,100 $ 40,772 $ 30,558 $ 18,739 Net income (loss) $ 18,027 $ 22,754 $ (61,579 ) $ 16,877 Net income (loss) per unit $ 0.22 $ 0.27 $ (0.74 ) $ 0.20 The sum of the quarterly per units amounts may not equal the full year amounts primarily because the computations of the weighted-average number of units of the Partnership outstanding for each quarter and the full year are made independently.

Subsequent Events

Subsequent Events	12 Months Ended
	Dec. 31, 2017
Subsequent Events [Abstract]
Subsequent Events	Subsequent Events Subsequent to December 31, 2017 and in addition to disclosures elsewhere in the financial statements, the Company sold two office properties for $21,000 .

Schedule III - Real Estate and

Schedule III - Real Estate and Accumulated Depreciation and Amortization	12 Months Ended
	Dec. 31, 2017
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation Disclosure	Description Location Encumbrances Land and Land Estates Buildings and Improvements Total Accumulated Depreciation and Amortization (1) Date Acquired Date Constructed Office Glendale, AZ $ — $ 9,418 $ 8,394 $ 17,812 $ 3,553 Sep-12 — Office Phoenix, AZ — 5,585 36,923 42,508 5,556 Dec-12 — Office Tempe, AZ — — 13,086 13,086 2,525 Sep-12 — Office Tucson, AZ — 681 4,037 4,718 929 Sep-12 — Office Palo Alto, CA 37,846 12,398 16,977 29,375 21,909 Dec-06 — Office Centenial, CO — 4,851 19,351 24,202 7,123 May-07 — Office Englewood, CO — 2,207 27,851 30,058 4,934 Apr-13 2013 Office Louisville, CO — 3,657 11,645 15,302 4,196 Sep-08 — Office Parachute, CO — 1,400 10,751 12,151 1,187 Jan-14 — Office Wallingford, CT — 1,049 4,773 5,822 2,010 Dec-03 — Office Boca Raton, FL 19,088 4,290 17,160 21,450 6,382 Feb-03 — Office Orlando, FL — 3,538 9,863 13,401 6,737 Jan-07 — Office McDonough, GA — 1,443 11,794 13,237 2,215 Sep-12 — Office McDonough, GA — 693 6,405 7,098 1,372 Sep-12 — Office Meridian, ID 8,428 2,255 7,797 10,052 2,142 Sep-12 — Office Schaumburg, IL — 5,007 22,340 27,347 6,225 Oct-13 — Office Columbus, IN 11,842 235 45,729 45,964 30,595 Dec-06 — Office Indianapolis, IN — 1,700 18,591 20,291 13,777 Apr-05 — Office Lenexa, KS 33,212 6,909 41,966 48,875 14,057 Jul-08 — Office Lenexa, KS 8,631 2,828 6,075 8,903 1,538 Sep-12 — Office Overland Park, KS 32,828 4,769 41,956 46,725 15,769 Jun-07 — Office Baton Rouge, LA — 1,252 11,085 12,337 4,924 May-07 — Office Oakland, ME 8,370 551 8,774 9,325 1,922 Sep-12 — Office Auburn Hills, MI — 4,416 30,012 34,428 4,120 Mar-15 — Office Livonia, MI — 935 13,714 14,649 3,347 Sep-12 — Office Kansas City, MO 15,618 2,433 20,154 22,587 7,553 Jun-07 — Office St Joseph, MO — 607 14,004 14,611 2,355 Sep-12 2012 Office Pascagoula, MS — 618 3,677 4,295 868 Sep-12 — Office Charlotte, NC 45,400 3,771 47,064 50,835 1,262 Apr-17 2017 Office Omaha, NE — 2,058 32,343 34,401 3,856 Dec-13 — Office Omaha, NE — 2,566 8,324 10,890 3,070 Nov-05 — Office Rockaway, NJ — 4,646 23,143 27,789 7,088 Dec-06 — Office Wall, NJ 11,924 8,985 26,961 35,946 14,671 Jan-04 — Office Whippany, NJ 12,704 4,063 19,711 23,774 9,018 Nov-06 — Office Las Vegas, NV — 12,099 53,164 65,263 14,947 Dec-06 — Office Columbus, OH — 1,594 10,481 12,075 1,834 Dec-10 — Office Columbus, OH — 432 2,773 3,205 451 Jul-11 — Office Westerville, OH — 2,085 9,411 11,496 3,322 May-07 — Office Eugene, OR — 1,541 13,098 14,639 2,290 Dec-12 2012 Office Redmond, OR — 2,064 8,316 10,380 1,913 Sep-12 — Office Jessup, PA — 2,520 17,688 20,208 3,792 Aug-12 2012 Office Philadelphia, PA — 13,209 57,071 70,280 39,639 Jun-05 — Office Florence, SC — 774 3,629 4,403 622 Feb-12 2012 Office Fort Mill, SC — 1,798 26,038 27,836 18,142 Nov-04 — Office Fort Mill, SC — 3,601 15,340 18,941 5,833 Dec-02 — Office Kingsport, TN — 513 403 916 233 Sep-12 — Office Knoxville, TN — 621 6,487 7,108 1,428 Sep-12 — Office Knoxville, TN — 1,079 11,351 12,430 7,505 Mar-05 — Office Memphis, TN — 5,291 97,032 102,323 27,795 Dec-06 — Office Allen, TX — 5,591 25,421 31,012 10,705 May-11 — Office Arlington, TX — 1,274 15,309 16,583 2,980 Sep-12 — Office Carrollton, TX — 2,599 22,050 24,649 9,273 Jun-07 — Office Carrollton, TX — 828 — 828 — Jun-07 — Office Houston, TX — 1,875 17,323 19,198 8,982 Apr-05 — Office Houston, TX — 1,875 10,959 12,834 8,176 Apr-05 — Description Location Encumbrances Land and Land Estates Buildings and Improvements Total Accumulated Depreciation and Amortization (1) Date Acquired Date Constructed Office Houston, TX — 16,613 63,770 80,383 20,604 Mar-04 — Office Irving, TX — 7,476 45,985 53,461 21,479 May-07 — Office Irving, TX — 4,889 30,192 35,081 12,645 Jun-07 — Office Lake Jackson, TX 192,451 7,435 141,436 148,871 6,182 Nov-16 2016/2017 Office Mission, TX — 2,556 2,911 5,467 903 Sep-12 — Office San Antonio, TX — 2,800 15,619 18,419 12,110 Apr-05 — Office Westlake, TX — 2,361 26,591 28,952 11,913 May-07 — Office Hampton, VA — 2,333 12,132 14,465 5,147 Mar-00 — Office Herndon, VA — 5,127 25,293 30,420 10,626 Dec-99 — Office Herndon, VA — 9,409 14,951 24,360 6,126 Jun-07 — Office Midlothian, VA — 1,100 12,767 13,867 8,601 Apr-05 — Office Richmond, VA 57,500 7,329 89,810 97,139 8,817 Dec-15 2015 Office Huntington, WV — 1,368 9,527 10,895 1,918 Jan-12 2012 Industrial Anniston, AL — 1,201 16,771 17,972 2,369 Dec-14 — Industrial Moody, AL — 654 9,943 10,597 7,251 Feb-04 — Industrial Opelika, AL — 134 33,183 33,317 579 Jul-17 2017 Industrial Orlando, FL — 1,030 10,869 11,899 3,371 Dec-06 — Industrial Tampa, FL — 2,160 8,526 10,686 6,457 Jul-88 — Industrial Lavonia, GA 7,010 171 7,657 7,828 1,155 Sep-12 — Industrial McDonough, GA — 5,441 52,762 58,203 912 Aug-17 — Industrial McDonough, GA — 2,463 24,811 27,274 7,188 Dec-06 — Industrial Thomson, GA — 909 7,746 8,655 995 May-15 2015 Industrial Edwardsville, IL — 4,593 34,251 38,844 1,416 Dec-16 — Industrial Rantoul, IL — 1,304 32,562 33,866 3,579 Jan-14 2014 Industrial Rockford, IL — 371 2,573 2,944 789 Dec-06 — Industrial Rockford, IL — 509 5,289 5,798 1,595 Dec-06 — Industrial Romeoville, IL — 7,524 40,167 47,691 1,798 Dec-16 — Industrial Lafayette, IN — 662 15,578 16,240 200 Oct-17 — Industrial Lebanon, IN — 2,100 29,443 31,543 1,108 Feb-17 — Industrial Plymouth, IN — 254 8,101 8,355 1,529 Sep-12 — Industrial New Century, KS — — 13,198 13,198 491 Feb-17 — Industrial Dry Ridge, KY — 560 12,553 13,113 5,453 Jun-05 — Industrial Elizabethtown, KY — 890 26,868 27,758 11,671 Jun-05 — Industrial Elizabethtown, KY — 352 4,862 5,214 2,112 Jun-05 — Industrial Hopkinsville, KY — 631 16,154 16,785 7,453 Jun-05 — Industrial Owensboro, KY — 393 11,956 12,349 5,978 Jun-05 — Industrial Owensboro, KY — 819 2,439 3,258 1,014 Dec-06 — Industrial Shreveport, LA — 1,078 10,134 11,212 2,050 Jun-12 2012 Industrial Shreveport, LA — 860 21,840 22,700 5,892 Mar-07 — Industrial North Berwick, ME 1,992 1,383 35,659 37,042 9,678 Dec-06 — Industrial Detroit, MI — 1,133 25,009 26,142 2,602 Jan-16 — Industrial Kalamazoo, MI — 1,942 14,169 16,111 3,036 Sep-12 — Industrial Marshall, MI — 143 4,302 4,445 2,469 Sep-12 — Industrial Marshall, MI — 40 2,236 2,276 1,164 Aug-87 — Industrial Plymouth, MI — 2,296 15,819 18,115 6,079 Jun-07 — Industrial Romulus, MI — 2,438 33,786 36,224 296 Nov-17 — Industrial Warren, MI — 972 42,521 43,493 296 Nov-17 — Industrial Minneapolis, MN — 1,886 1,922 3,808 322 Sep-12 — Industrial Byhalia, MS — 1,751 31,236 32,987 455 Sep-17 — Industrial Byhalia, MS — 1,006 35,795 36,801 5,131 May-11 2011 Industrial Canton, MS — 5,077 71,289 76,366 9,497 Mar-15 — Industrial Olive Branch, MS — 198 10,276 10,474 7,283 Dec-04 — Industrial Henderson, NC — 1,488 5,953 7,441 2,400 Nov-01 — Industrial Lumberton, NC — 405 12,049 12,454 4,263 Dec-06 — Industrial Shelby, NC — 1,421 18,862 20,283 4,593 Jun-11 2011 Industrial Statesville, NC — 891 16,771 17,662 5,355 Dec-06 — Industrial Durham, NH — 3,464 18,094 21,558 6,441 Jun-07 — Description Location Encumbrances Land and Land Estates Buildings and Improvements Total Accumulated Depreciation and Amortization (1) Date Acquired Date Constructed Industrial North Las Vegas, NV — 3,244 21,732 24,976 2,317 Jul-13 2014 Industrial Erwin, NY 6,991 1,648 12,514 14,162 2,450 Sep-12 — Industrial Long Island City, NY 43,334 — 42,759 42,759 13,737 Mar-13 2013 Industrial Chillicothe, OH — 735 9,021 9,756 2,745 Oct-11 — Industrial Cincinnati, OH — 1,049 8,784 9,833 2,785 Dec-06 — Industrial Columbus, OH — 1,990 10,742 12,732 3,837 Dec-06 — Industrial Glenwillow, OH — 2,228 24,530 26,758 7,176 Dec-06 — Industrial Hebron, OH — 1,063 4,947 6,010 1,827 Dec-97 — Industrial Hebron, OH — 1,681 8,179 9,860 3,349 Dec-01 — Industrial Streetsboro, OH 16,931 2,441 25,282 27,723 8,824 Jun-07 — Industrial Wilsonville, OR — 6,815 32,380 39,195 1,771 Sep-16 — Industrial Bristol, PA — 2,508 15,863 18,371 7,137 Mar-98 — Industrial Anderson, SC — 4,663 44,987 49,650 3,298 Jun-16 2016 Industrial Chester, SC 7,271 1,629 8,470 10,099 1,650 Sep-12 — Industrial Duncan, SC — 884 8,626 9,510 2,393 Jun-07 — Industrial Laurens, SC — 5,552 21,908 27,460 7,203 Jun-07 — Industrial Cleveland, TN — 1,871 29,743 31,614 865 May-17 — Industrial Crossville, TN — 545 6,999 7,544 4,218 Jan-06 — Industrial Franklin, TN — — 5,673 5,673 2,596 Sep-12 — Industrial Jackson, TN — 1,454 49,026 50,480 525 Sep-17 — Industrial Lewisburg, TN — 173 10,865 11,038 1,244 May-14 — Industrial Memphis, TN — 1,054 11,538 12,592 11,463 Feb-88 — Industrial Memphis, TN — 214 1,902 2,116 20 Dec-06 — Industrial Millington, TN — 723 19,383 20,106 12,022 Apr-05 — Industrial Smyrna, TN — 1,793 93,940 95,733 1,031 Sep-17 — Industrial Arlington, TX — 589 7,750 8,339 1,310 Sep-12 — Industrial Brookshire, TX — 2,388 16,614 19,002 2,138 Mar-15 — Industrial Grand Prairie, TX — 3,166 17,985 21,151 390 Jun-17 — Industrial Houston, TX — 4,674 19,540 24,214 5,879 Mar-15 — Industrial Houston, TX — 15,055 57,949 73,004 8,568 Mar-13 — Industrial Missouri City, TX — 14,555 5,895 20,450 4,772 Apr-12 — Industrial San Antonio, TX — 1,311 36,644 37,955 788 Jun-17 — Industrial Winchester, VA — 1,988 32,501 34,489 — Dec-17 — Industrial Winchester, VA — 3,823 12,276 16,099 4,008 Jun-07 — Industrial Bingen, WA — — 18,075 18,075 3,338 May-14 2014 Industrial Richland, WA 110,000 1,293 126,947 128,240 11,380 Nov-15 — Industrial Oak Creek, WI — 3,015 15,300 18,315 1,663 Jul-15 2015 Other Phoenix, AZ — 1,831 15,635 17,466 4,918 Nov-01 — Other Manteca, CA 187 2,082 6,464 8,546 2,041 May-07 — Other San Diego, CA 119 — 13,310 13,310 3,637 May-07 — Other Venice, FL — 4,696 11,753 16,449 6,755 Jan-15 — Other Albany, GA — 1,468 5,137 6,605 1,192 Oct-13 2013 Other Honolulu, HI — 8,259 7,398 15,657 4,199 Dec-06 — Other Galesburg, IL 105 91 250 341 3 May-07 — Other Lawrence, IN — 139 435 574 — Dec-06 — Other Baltimore, MD — 4,605 — 4,605 — Dec-06 — Other Baltimore, MD — 5,000 — 5,000 — Dec-15 — Other Jefferson, NC — 71 884 955 281 Dec-06 — Other Thomasville, NC — 208 561 769 104 Dec-06 — Other Vineland, NJ — 2,698 12,790 15,488 1,291 Oct-14 — Other Watertown, NY 176 386 5,162 5,548 1,713 May-07 — Other Lawton, OK — 663 1,288 1,951 538 Dec-06 — Other Charleston, SC 6,987 1,189 9,133 10,322 4,244 Nov-06 — Other Florence, SC — 744 1,280 2,024 160 May-04 — Other Antioch, TN — 3,847 12,659 16,506 2,923 May-07 — Description Location Encumbrances Land and Land Estates Buildings and Improvements Total Accumulated Depreciation and Amortization (1) Date Acquired Date Constructed Other Chattanooga, TN — 487 956 1,443 175 Dec-06 — Other Paris, TN — 247 547 794 220 Dec-06 — Other Farmers Branch, TX — 3,984 30,798 34,782 12,375 Jun-07 — Other Houston, TX — 800 27,670 28,470 21,400 Apr-05 — Other Danville, VA — 3,454 — 3,454 — Oct-13 — Other Fairlea, WV 123 501 1,985 2,486 600 May-07 — Construction in progress — — — 4,219 — Deferred loan costs, net (7,258 ) — — — — $ 689,810 $ 456,134 $ 3,476,106 $ 3,936,459 $ 890,969 (1) Depreciation and amortization expense is calculated on a straight-line basis over the following lives: Building and improvements Up to 40 years Land estates Up to 51 years Tenant improvements Shorter of useful life or term of related lease The initial cost includes the purchase price paid directly or indirectly by the Company. The total cost basis of the Company's properties at December 31, 2017 for federal income tax purposes was approximately $4.7 billion . 2017 2016 2015 Reconciliation of real estate, at cost: Balance at the beginning of year $ 3,533,172 $ 3,789,711 $ 3,671,560 Additions during year 676,355 291,004 478,717 Properties sold and impaired during the year (270,241 ) (527,597 ) (343,976 ) Other reclassifications (2,827 ) (19,946 ) (16,590 ) Balance at end of year $ 3,936,459 $ 3,533,172 $ 3,789,711 Reconciliation of accumulated depreciation and amortization: Balance at the beginning of year $ 844,931 $ 812,207 $ 795,486 Depreciation and amortization expense 139,493 128,384 124,618 Accumulated depreciation and amortization of properties sold and impaired during year (93,455 ) (86,428 ) (106,268 ) Other reclassifications — (9,232 ) (1,629 ) Balance at end of year $ 890,969 $ 844,931 $ 812,207
LCIF [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation Disclosure	Description Location Encumbrances Land and Land Estates Buildings and Improvements Total Accumulated Depreciation and Amortization (1) Date Acquired Date Constructed Office Phoenix, AZ $ — $ 5,585 $ 36,923 $ 42,508 $ 5,556 Dec-12 — Office Centenial, CO — 4,851 19,351 24,202 7,123 May-07 — Office Louisville, CO — 3,657 11,645 15,302 4,196 Sep-08 — Office Wallingford, CT — 1,049 4,773 5,822 2,010 Dec-03 — Office Boca Raton, FL 19,088 4,290 17,160 21,450 6,382 Feb-03 — Office Schaumburg, IL — 5,007 22,340 27,347 6,225 Oct-13 — Office Overland Park, KS 32,828 4,769 41,956 46,725 15,769 Jun-07 — Office Baton Rouge, LA — 1,252 11,085 12,337 4,924 May-07 — Office Charlotte, NC 45,400 3,771 47,064 50,835 1,262 Apr-17 2017 Office Fort Mill, SC — 1,798 26,038 27,836 18,142 Nov-04 — Office Fort Mill, SC — 3,601 15,340 18,941 5,833 Dec-02 — Office Carrollton, TX — 2,599 22,050 24,649 9,273 Jun-07 — Office Carrollton, TX — 828 — 828 — Jun-07 — Office Westlake, TX — 2,361 26,591 28,952 11,913 May-07 — Office Herndon, VA — 5,127 25,293 30,420 10,626 Dec-99 — Industrial Moody, AL — 654 9,943 10,597 7,251 Feb-04 — Industrial Tampa, FL — 2,160 8,526 10,686 6,457 Jul-88 — Industrial Romeoville, IL — 7,524 40,167 47,691 1,798 Dec-16 — Industrial Marshall, MI — 40 2,236 2,276 1,164 Aug-87 — Industrial Warren, MI — 972 42,521 43,493 296 Nov-17 — Industrial Byhalia, MS — 1,006 35,795 36,801 5,131 May-11 2011 Industrial Olive Branch, MS — 198 10,276 10,474 7,283 Dec-04 — Industrial Shelby, NC — 1,421 18,917 20,338 4,593 Jun-11 2011 Industrial Hebron, OH — 1,063 4,947 6,010 1,827 Dec-97 — Industrial Hebron, OH — 1,681 8,179 9,860 3,349 Dec-01 — Industrial Bristol, PA — 2,508 15,863 18,371 7,137 Mar-98 — Industrial Grand Prairie, TX — 3,166 17,985 21,151 390 Jun-17 — Industrial Richland, WA 110,000 1,293 126,947 128,240 11,380 Nov-15 — Other Albany, GA — 1,468 5,137 6,605 1,192 Oct-13 2013 Other Honolulu, HI — 8,259 7,398 15,657 4,199 Dec-06 — Other Vineland, NJ — 2,698 12,790 15,488 1,291 Oct-14 — Other Charleston, SC 6,987 1,189 9,133 10,322 4,244 Nov-06 — Other Florence, SC — 744 1,280 2,024 160 May-04 — Construction in progress — — — 4 — Deferred loan costs, net (1,511 ) — — — — $ 212,792 $ 88,589 $ 705,649 $ 794,242 $ 178,376 (1) Depreciation and amortization expense is calculated on a straight-line basis over the following lives: Building and improvements Up to 40 years Tenant improvements Shorter of useful life or term of related lease The initial cost includes the purchase price paid directly or indirectly by the Partnership. The total cost basis of the Partnership's properties at December 31, 2017 for federal income tax purposes was approximately $0.9 billion . 2017 2016 2015 Reconciliation of real estate, at cost: Balance at the beginning of year $ 731,202 $ 1,061,606 $ 910,113 Additions during year 123,261 49,417 152,280 Properties sold and impaired during year (60,221 ) (379,821 ) (787 ) Balance at end of year $ 794,242 $ 731,202 $ 1,061,606 Reconciliation of accumulated depreciation and amortization: Balance at the beginning of year $ 182,505 $ 199,690 $ 176,167 Depreciation and amortization expense 30,701 26,989 23,523 Accumulated depreciation and amortization of properties sold and impaired during year (34,830 ) (44,174 ) — Balance at end of year $ 178,376 $ 182,505 $ 199,690

Summary of Significant Accoun32

Summary of Significant Accounting Policies (Policies)	12 Months Ended
	Dec. 31, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
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/Unit	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, loans receivable and equity method investments, valuation of derivative financial instruments, valuation of 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. Gains on sales of real estate are recognized based upon the specific timing of the sale as measured against various criteria related to the terms of the transactions and any continuing involvement associated with the properties. If the sales criteria are not met, the gain is deferred and the finance, installment or cost recovery method, as appropriate, is applied until the sales criteria are met. To the extent the Company sells a property and retains a partial ownership interest in the property, the Company recognizes gain to the extent of the third-party ownership interest.
Purchase Accounting and Acquisition of Real Estate	Purchase Accounting and 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. Acquisition costs are expensed as incurred and are included in property operating expense in the accompanying Consolidated Statement of Operations. 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.
Loans Receivable	Loans Receivable. Loans held for investment are intended to be held to maturity and, accordingly, are carried at cost, net of unamortized loan origination costs and fees, loan purchase discounts, and net of an allowance for loan losses when such loan is deemed to be impaired. Loan origination costs and fees and loan purchase discounts are amortized over the term of the loan. The Company considers a loan impaired when, based upon current information and events, it is probable that it will be unable to collect all amounts due for both principal and interest according to the contractual terms of the loan agreement. Significant judgments are required in determining whether impairment has occurred. The Company performs an impairment analysis by comparing either the present value of expected future cash flows discounted at the loan's effective interest rate, the loan's observable current market price or the fair value of the underlying collateral to the net carrying value of the loan, which may result in an allowance and corresponding loan loss charge. Interest income is recorded on a cash basis for impaired loans.
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. Commencing January 1, 2015, 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 expire 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	Recently Issued Accounting Guidance. In May 2014, the FASB issued ASU 2014-09, Revenue from Contracts with Customers (Topic 606), 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 effective date of the new guidance was updated by ASU 2015-14 and is 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. The Company expects that it may be impacted upon adoption of ASU 2014-09 in its recognition of non-lease revenue, non-lease components of revenue from lease agreements (upon adoption of ASU 2016-02) and the timing of its recognition of real estate sale transactions. 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. As a result, the Company generally expects that the new guidance may result in transactions qualifying as sales of real estate at an earlier date than under current accounting guidance. The Company believes the impact would be limited to the timing and income statement presentation of revenue and not the total amount of revenue recognized over time. The Company adopted ASU 2014-09 effective January 1, 2018 using the modified retrospective approach, and, as the majority of the Company’s revenue is from rental income related to leases, the Company does not believe the ASU will have a material impact on its consolidated financial statements. 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 ASU is expected to result in the recognition of a right-to-use asset and related liability to account for the Company's future obligations under its ground lease arrangements for which the Company is the lessee. 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 an exposure draft in January 2018 (2018 Exposure Draft) which, if adopted as written, would allow 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 will require that the Company capitalize, as initial direct costs, only those costs that are incurred due to the execution of a lease. ASU 2016-02 will be 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, the 2018 Exposure Draft indicates that companies may be permitted to recognize a cumulative-effect adjustment to the opening balance of retained earnings in the period of adoption. The pronouncement allows some optional practical expedients. The Company expects to adopt this new guidance on January 1, 2019 and will continue to evaluate the impact of this guidance until it becomes effective. In March 2016, the FASB issued ASU 2016-09, Compensation-Stock Compensation-Improvements to Employee Share-Based Payment Accounting (Topic 718), which involves several aspects of the accounting for share-based payment transactions, including the income tax consequences, classification of awards as either equity or liabilities, and classification on the statement of cash flows. The Company adopted this new guidance on January 1, 2017. This new guidance did not have a material impact on the Company's consolidated financial statements. The Company has made an accounting policy election to account for share-based award forfeitures in compensation costs when they occur. 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. The ASU is effective for fiscal years beginning after December 15, 2017, including interim periods within those years; however, early adoption is permitted. Entities must apply the guidance retrospectively to all periods presented but may apply it prospectively if retrospective application would be impracticable. The Company adopted this guidance effective January 1, 2018. The Company does not believe the adoption of this guidance will have a material impact on its consolidated financial statements. 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. The ASU is effective for reporting periods beginning after December 15, 2017, with early adoption permitted, and will be applied retrospectively to all periods presented. Upon adoption, restricted cash balances will be 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. Upon adoption, separate line items showing changes in restricted cash balances will be eliminated from the Company's consolidated statement of cash flows. The Company adopted this guidance effective January 1, 2018. 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 is effective for reporting periods beginning after December 15, 2017, with early adoption permitted. 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. The Company does not believe that the adoption of this guidance will 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 ASU is effective for annual periods, and interim periods therein, beginning after December 15, 2017. The Company adopted ASU 2017-05 effective January 1, 2018 and it is not expected to have a material impact on its consolidated financial statements. 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 ASU is effective for reporting periods beginning after December 15, 2018. Early adoption is permitted. The Company is currently evaluating the impact of the adoption of the new guidance on its consolidated financial statements.
LCIF [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Basis of Presentation and Consolidation	Basis of Presentation and Consolidation. The Partnership'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 Partnership and its consolidated subsidiaries. The Partnership 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 Partnership is the primary beneficiary of a variable interest entity (“VIE”). Entities which the Partnership does not control and entities which are VIEs in which the Partnership is not the primary beneficiary are accounted for under appropriate GAAP.
Earnings Per Share/Unit	Earnings Per Unit . Net income (loss) per unit is computed by dividing net income (loss) by the weighted-average number of units outstanding during the period. There are no potential dilutive securities.
Partners' Capital, Unit Redemptions	Unit Redemptions . The Partnership's limited partner units that are issued and outstanding, other than those held by Lexington, are currently redeemable at certain times, only at the option of the holders, for Lexington shares of beneficial interests, par value $0.0001 per share classified as common stock (“common shares”), on a one to approximately 1.13 basis, subject to future adjustments. These units are not otherwise mandatorily redeemable by the Partnership.
Allocation of Overhead Expenses	Allocation of Overhead Expenses . The Partnership does not pay a fee to the General Partner for the day-to-day management of the Partnership. Certain expenses incurred by the General Partner and its affiliates, including Lexington, such as corporate-level interest, amortization of deferred loan costs, payroll and general and administrative expenses are allocated to the Partnership and reimbursed to the General Partner in accordance with the Partnership's partnership agreement. The allocation is based upon gross rental revenues.
Distributions; Allocations of Income and Loss	Distributions; Allocations of Income and Loss . As provided in the Partnership's partnership agreement, distributions and income and loss for financial reporting purposes are allocated to the partners based on their ownership of units. Special allocation rules included in the partnership agreement affect the allocation of taxable income and loss.
Use of Estimates	Use of Estimates. The Partnership 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. The Partnership evaluates its estimates and assumptions on an ongoing basis using historical experience and other factors, including the economic environment. The Partnership 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, loans receivable and equity method investments and the useful lives of long-lived assets. Actual results could differ materially from those estimates.
Fair Value Measurements	Fair Value Measurements. The Partnership 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 Partnership 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 counter-party credit risk.
Revenue Recognition	Revenue Recognition. The Partnership 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 Partnership funds tenant improvements and the improvements are deemed to be owned by the Partnership, 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 Partnership determines that the tenant allowances are lease incentives, the Partnership 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 Partnership 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 Partnership 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. Gains on sales of real estate are recognized based upon the specific timing of the sale as measured against various criteria related to the terms of the transactions and any continuing involvement associated with the properties. If the sales criteria are not met, the gain is deferred and the finance, installment or cost recovery method, as appropriate, is applied until the sales criteria are met. To the extent the Partnership sells a property and retains a partial ownership interest in the property, the Partnership recognizes gain to the extent of the third-party ownership interest.
Purchase Accounting and Acquisition of Real Estate	Purchase Accounting and 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. Acquisition costs are expensed as incurred and are included in property operating expense in the accompanying Consolidated Statement of Operations. 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. The Partnership also estimates costs to execute similar leases including leasing commissions. The Partnership's 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 the Partnership'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 are 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 Partnership generally depreciates its real estate assets over periods ranging up to 40 years.
Impairment of Real Estate	Impairment of Real Estate. The Partnership 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 the 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 Partnership accounts for its investments in 50% or less owned entities under the equity method, unless consolidation is required. If the Partnership's investment in the entity is insignificant and the Partnership 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 Partnership assesses whether there are indicators that the value of its equity method investments may be impaired. An impairment charge is recognized only if the Partnership 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 Partnership's intent and ability to recover its investment given the nature and operations of the underlying investment, 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 Partnership evaluates loans receivable where the Partnership participates in residual profits through loan provisions or other contracts to ascertain whether the Partnership has the same risks and rewards as an owner or a joint venture partner. Where the Partnership concludes that such arrangements are more appropriately treated as an investment in real estate, the Partnership 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 Partnership records capitalized interest during the construction period. In arrangements where the Partnership engages a developer to construct a property or provide funds to a tenant to develop a property, the Partnership 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. Commencing January 1, 2015, 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 leasing costs, which are amortized over the term of the related lease.
Tax Status	Income Taxes. Because the Partnership is a limited partnership, taxable income or loss of the Partnership is reported in the income tax returns of its partners. Accordingly, no provision for income taxes is made in the Consolidated Financial Statements of the Partnership. However, the Partnership is required to pay certain state and local entity level taxes which are expensed as incurred.
Cash and Cash Equivalents	Cash and Cash Equivalents. The Partnership 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.
Co-borrower Debt	Co-borrower Debt. The Partnership is subject to ASC 405-40, which requires recognition of obligations as to which it is a co-borrower as the sum of (a) the amount the reporting entity agreed to pay on the basis of its arrangement among its co-obligors and (b) any additional amount the reporting entity expects to pay on
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 Partnership 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 Partnership'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, 2017 , the Partnership 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	Segment Reporting. The Partnership operates generally in one industry segment, single-tenant real estate assets.
Recently Issued Accounting Guidance	Recently Issued Accounting Guidance. In May 2014, the FASB issued ASU 2014-09, Revenue from Contracts with Customers (Topic 606), 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 effective date of the new guidance was updated by ASU 2015-14 and is effective for reporting periods beginning after December 15, 2017. The Partnership’s revenue-producing contracts are primarily leases that are not within the scope of this standard as leases are excluded from ASU 2014-09. The Partnership expects that it may be impacted in its recognition of non-lease revenue, non-lease components of revenue from lease agreements (upon adoption of ASU 2016-02) and the timing of its recognition of real estate sale transactions. 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. As a result, the Partnership generally expects that the new guidance may result in transactions qualifying as sales of real estate at an earlier date than under current accounting guidance. The Partnership believes the impact would be limited to the timing and income statement presentation of revenue and not the total amount of revenue recognized over time. The Partnership adopted ASU 2014-09 effective January 1, 2018 using the modified retrospective approach. As the majority of the Partnership’s revenue is from rental income related to leases, the Partnership does not believe the ASU will have a material impact on its consolidated financial statements. 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 ASU is expected to result in the recognition of a right-to-use asset and related liability to account for the Partnership's future obligations under its ground lease arrangements for which the Partnership is the lessee. From a lessor perspective, the Partnership 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 an exposure draft in January 2018 (2018 Exposure Draft) which, if adopted as written, would allow 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 will require that the Partnership capitalize, as initial direct costs, only those costs that are incurred due to the execution of a lease. ASU 2016-02 will be 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, the 2018 Exposure Draft indicates that companies may be permitted to recognize a cumulative-effect adjustment to the opening balance of retained earnings in the period of adoption. The pronouncement allows some optional practical expedients. The Partnership expects to adopt this new guidance on January 1, 2019 and will continue to evaluate the impact of this guidance until it becomes effective. 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. The ASU is effective for fiscal years beginning after December 15, 2017, including interim periods within those years; however, early adoption is permitted. Entities must apply the guidance retrospectively to all periods presented but may apply it prospectively if retrospective application would be impracticable. The Partnership adopted this guidance effective January 1, 2018. The Partnership does not believe the adoption of this guidance will have a material impact on its consolidated financial statements. 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. The ASU is effective for reporting periods beginning after December 15, 2017, with early adoption permitted, and will be applied retrospectively to all periods presented. Upon adoption, restricted cash balances will be included along with cash and cash equivalents as of the end of the period and beginning of period, respectively, in the Partnership's consolidated statement of cash flows for all periods presented. Upon adoption, separate line items showing changes in restricted cash balances will be eliminated from the Partnership's consolidated statement of cash flows. The Partnership adopted this guidance effective January 1, 2018. 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 is effective for reporting periods beginning after December 15, 2017, with early adoption permitted. The Partnership 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 Partnership adopted this guidance effective January 1, 2018. The Partnership does not believe that the adoption of this guidance will 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 Partnership to measure at fair value any retained interest in a partial sale of real estate. The ASU is effective for annual periods, and interim periods therein, beginning after December 15, 2017. The Partnership adopted ASU 2017-05 effective January 1, 2018 and it is not expected to have a material impact on its consolidated financial statements.

Summary of Significant Accoun33

Summary of Significant Accounting Policies (Tables)	12 Months Ended
	Dec. 31, 2017
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, 2017 and 2016 : December 31, 2017 December 31, 2016 Real estate, net $ 682,587 $ 778,265 Total assets $ 766,025 $ 899,801 Mortgages and notes payable, net $ 212,792 $ 364,099 Total liabilities $ 226,331 $ 395,332

Earnings Per Share (Tables)

Earnings Per Share (Tables)	12 Months Ended
	Dec. 31, 2017
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, 2017 : 2017 2016 2015 BASIC Income from continuing operations attributable to common shareholders $ 79,067 $ 89,109 $ 103,418 Income from discontinued operations attributable to common shareholders — — 1,682 Net income attributable to common shareholders $ 79,067 $ 89,109 $ 105,100 Weighted-average number of common shares outstanding 237,758,408 233,633,058 233,455,056 Income per common share: Income from continuing operations $ 0.33 $ 0.38 $ 0.44 Income from discontinued operations — — 0.01 Net income attributable to common shareholders $ 0.33 $ 0.38 $ 0.45 2017 2016 2015 DILUTED: Income from continuing operations attributable to common shareholders $ 79,067 $ 89,109 $ 103,418 Impact of assumed conversions 147 (159 ) — Income from continuing operations attributable to common shareholders 79,214 88,950 103,418 Income from discontinued operations attributable to common shareholders — — 1,682 Impact of assumed conversions: — — — Income from discontinued operations attributable to common shareholders — — 1,682 Net income attributable to common shareholders $ 79,214 $ 88,950 $ 105,100 Weighted-average common shares outstanding - basic 237,758,408 233,633,058 233,455,056 Effect of dilutive securities: Share options 86,285 230,352 296,719 Operating Partnership Units 3,693,144 3,815,621 — Weighted-average common shares outstanding - diluted 241,537,837 237,679,031 233,751,775 Income per common share: Income from continuing operations $ 0.33 $ 0.37 $ 0.44 Income from discontinued operations — — 0.01 Net income attributable to common shareholders $ 0.33 $ 0.37 $ 0.45

Investments in Real Estate an35

Investments in Real Estate and Real Estate Under Construction (Tables)	12 Months Ended
	Dec. 31, 2017
Investments in Real Estate and Real Estate Under Construction [Line Items]
Schedule of Net Real Estate	The Company's real estate, net, consists of the following at December 31, 2017 and 2016 : 2017 2016 Real estate, at cost: Buildings and building improvements $ 3,476,022 $ 3,050,082 Land, land estates and land improvements 456,134 472,394 Fixtures and equipment 84 5,577 Construction in progress 4,219 5,119 Real estate intangibles: In-place lease values 461,624 436,185 Tenant relationships 97,223 113,839 Above-market leases 40,244 47,270 Investments in real estate under construction — 106,652 4,535,550 4,237,118 Accumulated depreciation and amortization (1) (1,225,650 ) (1,208,792 ) Real estate, net $ 3,309,900 $ 3,028,326 (1) Includes accumulated amortization of real estate intangible assets of $334,681 and $363,861 in 2017 and 2016 , respectively. The estimated amortization of the above real estate intangible assets for the next five years is $31,401 in 2018 , $26,578 in 2019 , $23,360 in 2020 , $22,211 in 2021 and $20,951 in 2022 .
Schedule of Acquired Properties	The Company completed the following acquisitions and build-to-suit transactions during 2017 and 2016 : 2017 : 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 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 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 (see Note 2) 2016 : Real Estate Intangibles Property Type Location Acquisition Date Initial Cost Basis Lease Expiration Land and Land Estate Building and Improvements Lease in-place Value Below Market Lease Industrial Detroit, MI January 2016 $ 29,697 10/2035 $ 1,133 $ 25,009 $ 3,555 $ — Industrial Anderson, SC June 2016 61,347 06/2036 4,663 45,011 11,673 — Industrial Wilsonville, OR September 2016 43,100 10/2032 6,815 32,380 5,920 (2,015 ) Office Lake Jackson, TX November 2016 78,484 10/2036 4,357 74,127 — — Industrial Romeoville, IL December 2016 52,700 10/2031 7,524 40,167 5,009 — Industrial Edwardsville, IL December 2016 44,800 09/2026 4,593 34,251 5,956 — $ 310,128 $ 29,085 $ 250,945 $ 32,113 $ (2,015 ) Weighted-average life of intangible assets (years) 16.6 16.1
LCIF [Member]
Investments in Real Estate and Real Estate Under Construction [Line Items]
Schedule of Net Real Estate	The Partnership's real estate, net, consists of the following at December 31, 2017 and 2016 : 2017 2016 Real estate, at cost: Buildings and building improvements $ 705,565 $ 644,173 Land, land estates and land improvements 88,589 86,120 Fixtures and equipment 84 84 Construction in progress 4 825 Real estate intangibles: In-place lease values 95,166 82,190 Tenant relationships 19,067 19,943 Above-market leases 2,628 2,628 Investment in real estate under construction — 40,443 911,103 876,406 Accumulated depreciation and amortization (1) (233,121 ) (236,930 ) Real estate, net $ 677,982 $ 639,476 (1) Includes accumulated amortization of real estate intangible assets of $54,745 and $54,425 in 2017 and 2016 , respectively. The estimated amortization of the above real estate intangible assets for the next five years is $5,307 in 2018 , $4,557 in 2019 , $4,445 in 2020 , $4,431 in 2021 and $4,431 in 2022 .
Schedule of Acquired Properties	The Partnership, through property owner subsidiaries, completed the following build-to-suit transaction/acquisitions during 2017 : Property Type Location Acquisition Date Initial Cost Basis Lease Expiration Land Building and Improvements Lease in-place Value Intangible Office Charlotte, NC Apr-17 $ 61,339 04/2032 $ 3,771 $ 47,064 $ 10,504 Industrial Grand Prairie, TX Jun-17 24,317 03/2037 3,166 17,985 3,166 Industrial Warren, MI Nov-17 46,955 10/2032 972 42,521 3,462 $ 132,611 $ 7,909 $ 107,570 $ 17,132 Weighted-average life of intangible assets (years) 15.9 The Partnership, through property owner subsidiaries, completed the following acquisition during 2016 : Property Type Location Acquisition Date Initial Cost Basis Lease Expiration Land and Land Estates Building and Improvements Lease in-place Value Intangible Industrial Romeoville, IL Dec-16 $ 52,700 10/2031 $ 7,524 $ 40,167 $ 5,009 Life of intangible asset (years) 14.9

Property Dispositions and Rea36

Property Dispositions and Real Estate Impairment (Tables)	12 Months Ended
	Dec. 31, 2017
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, 2017 and 2016 consisted of the following: December 31, 2017 December 31, 2016 Assets: Real estate, at cost $ 2,827 $ 25,957 Real estate, intangible assets — 7,789 Accumulated depreciation and amortization — (13,346 ) Rent receivable - deferred — 1,715 Other — 1,693 $ 2,827 $ 23,808 Liabilities: Other $ — $ 191 $ — $ 191

Loans Receivable (Tables)

Loans Receivable (Tables)	12 Months Ended
	Dec. 31, 2017
Loans Receivable, Net [Abstract]
Schedule of Accounts, Notes, Loans and Financing Receivable	The following is a summary of the Company's loans receivable as of December 31, 2016: Loan carrying-value (1) Loan 12/31/2016 Interest Rate Maturity Date Kennewick, WA (2) $ 85,709 9.00 % 05/2022 Oklahoma City, OK (3) 8,501 11.50 % 03/2016 $ 94,210 (1) Loan carrying value included accrued interest and was net of origination costs, if any. (2) Loan provided for a current pay rate of 8.75% , an accrual rate of 9.0% and a balloon of $87,245 at maturity. During 2017 , the loan was assigned to a third party for 94% of its principal balance. The Company recognized a $5,294 loan loss on the transaction. (3) In June 2015, the Company loaned a tenant-in-common $8,420 . The loan was secured by the tenant-in-common's interest in an office property, in which the Company had a 40% tenant-in-common interest. The loan was satisfied in full in February 2017. The Company incurred professional fees of $376 to collect this loan. Such fees are included in general and administrative expenses on the Company's Consolidated Statements of Operations for the year ended December 31, 2017 .

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	12 Months Ended
	Dec. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
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, 2017 and 2016 , aggregated by the level in the fair value hierarchy within which those measurements fall: 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 Fair Value Measurements Using Description 2016 (Level 1) (Level 2) (Level 3) Interest rate swap assets $ 44 $ — $ 44 $ — Impaired real estate assets* $ 15,801 $ — $ — $ 15,801 Interest rate swap liabilities $ (1,077 ) $ — $ (1,077 ) $ — *Represents a non-recurring fair value measurement determined during the respective years.
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, 2017 and 2016 : As of December 31, 2017 As of December 31, 2016 Carrying Amount Fair Value Carrying Amount Fair Value Assets Loans Receivable $ — $ — $ 94,210 $ 94,911 Liabilities Debt $ 2,068,867 $ 2,013,226 $ 1,860,598 $ 1,814,824
LCIF [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Schedule of Fair Value Measurement Inputs	The following tables present the Partnership's assets and liabilities measured at fair value on a non-recurring basis during the year ended December 31, 2017 , aggregated by the level in the fair value hierarchy within which those measurements fall: Fair Value Measurements Using Description 2017 (Level 1) (Level 2) (Level 3) Impaired real estate asset* $ 2,090 $ — $ — $ 2,090
Fair Value, by Balance Sheet Grouping	The table below sets forth the carrying amounts and estimated fair values of the Partnership's financial instruments as of December 31, 2017 and 2016 : As of December 31, 2017 As of December 31, 2016 Carrying Amount Fair Value Carrying Amount Fair Value Liabilities Debt $ 370,581 $ 352,806 $ 315,616 $ 314,509

Mortgages and Notes Payable (Ta

Mortgages and Notes Payable (Tables)	12 Months Ended
	Dec. 31, 2017
Debt Instrument [Line Items]
Schedule of Long-term Debt Instruments	The Company had the following mortgages and notes payable outstanding as of December 31, 2017 and 2016 : December 31, 2017 December 31, 2016 Mortgages and notes payable $ 697,068 $ 745,173 Unamortized debt issuance costs (7,258 ) (7,126 ) $ 689,810 $ 738,047
Schedule of Line of Credit Facilities	A summary of the significant terms are as follows: Current $505,000 Revolving Credit Facility (1) August 2019 LIBOR + 1.00% $300,000 Term Loan (2)(4) August 2020 LIBOR + 1.10% $300,000 Term Loan (3)(4) January 2021 LIBOR + 1.10% (1) Increased from $400,000 . 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, 2017 , the revolving credit facility had $160,000 borrowings outstanding and availability of $345,000 , subject to covenant compliance. (2) Increased from $250,000 . The interest rate ranges from LIBOR plus 0.90% to 1.75% . The Company has aggregate interest-rate swap agreements to fix the LIBOR component at a weighted-average rate of 1.09% through February 2018 on $250,000 of the $300,000 outstanding LIBOR-based borrowings. (3) Increased from $255,000 . The interest rate ranges from LIBOR plus 0.90% to 1.75% . The Company has 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. (4) The aggregate unamortized debt issuance costs for the term loans were $3,337 and $3,907 as of December 31, 2017 and 2016, respectively.
Mortgages and Notes Payable [Member]
Debt Instrument [Line Items]
Schedule of Maturities of Long-term Debt	Scheduled principal and balloon payments for mortgages, notes payable, credit facility borrowings and term loans for the next five years and thereafter are as follows: Year ending December 31, Total 2018 $ 35,940 2019 270,448 2020 355,147 2021 340,465 2022 30,120 Thereafter 424,948 1,457,068 Unamortized debt discounts (10,595 ) $ 1,446,473
LCIF [Member]
Debt Instrument [Line Items]
Schedule of Long-term Debt Instruments	The Partnership had the following mortgages and notes payable outstanding as of December 31, 2017 and 2016 : December 31, 2017 December 31, 2016 Mortgages and notes payable $ 214,303 $ 169,958 Unamortized debt issuance costs (1,511 ) (746 ) $ 212,792 $ 169,212
Schedule of Line of Credit Facilities	A summary of the significant terms are as follows: Maturity Date Current $505,000 Revolving Credit Facility (1) August 2019 LIBOR + 1.00% $300,000 Term Loan (2) August 2020 LIBOR + 1.10% $300,000 Term Loan (3) January 2021 LIBOR + 1.10% (1) Increased from $400,000 . Maturity date can be extended to August 2020 at the Lexington's option. The interest rate ranges from LIBOR plus 0.85% to 1.55% . At December 31, 2017 , the revolving credit facility had $160,000 of borrowings outstanding and availability of $345,000 subject to covenant compliance. (2) Increased from $250,000 . The interest rate ranges from LIBOR plus 0.90% to 1.75% . Interest-rate swap agreements exist to fix the LIBOR component at a weighted-average rate of 1.09% through February 2018 on $250,000 of the $300,000 outstanding LIBOR-based borrowings. (3) Increased from $255,000 . The interest rate ranges from LIBOR plus 0.90% to 1.75% . Interest-rate swap agreements exist 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.

Senior Notes, Convertible Not40

Senior Notes, Convertible Notes and Trust Preferred Securities (Tables)	12 Months Ended
	Dec. 31, 2017
Debt Instrument [Line Items]
Debt Instrument Redemption	The Company had the following Senior Notes outstanding as of December 31, 2017 and 2016 : Issue Date December 31, 2017 December 31, 2016 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 (1,507 ) (1,780 ) Unamortized debt issuance cost (3,295 ) (3,858 ) $ 495,198 $ 494,362
Senior Notes, Convertible Notes, and Trust Preferred Securities [Member]
Debt Instrument [Line Items]
Schedule of Maturities of Long-term Debt	Scheduled principal payments for these debt instruments for the next five years and thereafter are as follows: Year ending December 31, Total 2018 $ — 2019 — 2020 — 2021 — 2022 — Thereafter 629,120 629,120 Unamortized debt discounts (1,507 ) Unamortized debt issuance costs (5,219 ) $ 622,394

Derivatives and Hedging Activ41

Derivatives and Hedging Activities (Tables)	12 Months Ended
	Dec. 31, 2017
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Schedule of Derivative Instruments	As of December 31, 2017 , 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 10 $505,000
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, 2017 and 2016 . As of December 31, 2017 As of December 31, 2016 Balance Sheet Location Fair Value Balance Sheet Location Fair Value Derivatives designated as hedging instruments: Interest Rate Swap Asset Other Assets $ 1,065 Other Assets $ 44 Interest Rate Swap Liability Accounts Payable and Other Liabilities $ — Accounts Payable and Other Liabilities $ (1,077 )
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 2017 and 2016 : Derivatives in Cash Flow Amount of Loss Recognized Location of Loss Reclassified from Accumulated OCI into Income (Effective Portion) Amount of Loss Reclassified Hedging Relationships 2017 2016 2017 2016 Interest Rate Swap $ 1,168 $ (3,084 ) Interest expense $ 930 $ 3,990

Leases (Tables)

Leases (Tables)	12 Months Ended
	Dec. 31, 2017
Operating Leased Assets [Line Items]
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 2018 $ 354,240 2019 333,463 2020 304,651 2021 284,114 2022 265,346 Thereafter 2,114,450 $ 3,656,264
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 2018 $ 4,330 2019 3,887 2020 3,886 2021 3,829 2022 3,893 Thereafter 28,727 $ 48,552
LCIF [Member]
Operating Leased Assets [Line Items]
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 2018 $ 73,224 2019 68,794 2020 63,719 2021 59,332 2022 54,811 Thereafter 534,397 $ 854,277

Concentration of Risk (Tables)

Concentration of Risk (Tables)	12 Months Ended
	Dec. 31, 2017
LCIF [Member]
Concentration Risk [Line Items]
Schedules of Concentration of Risk, by Risk Factor	For the years ended December 31, 2017 , 2016 , and 2015 , the following tenants represented greater than 10% of rental revenues: 2017 2016 2015 SM Ascott LLC (1) — % 11.2 % 14.7 % Tribeca Ascott LLC (1) — % — % 12.6 % AL-Stone Ground Tenant LLC (1) — % — % 11.5 % Preferred Freezer Services of Richland, LLC 17.6 % 11.4 % — % (1) The Partnership net leased individual land parcels to the tenants listed above under non-cancellable 99 -year (original term) leases. The improvements on these parcels are owned by the tenants and consist of three high-rise hotels located in New York, NY. The Partnership sold these assets in September 2016.

Equity (Tables)

Equity (Tables)	12 Months Ended
	Dec. 31, 2017
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, 2017 2016 Balance at beginning of period $ (1,033 ) (1,939 ) Other comprehensive income (loss) before reclassifications 1,168 (3,084 ) Amounts of loss reclassified from accumulated other comprehensive income to interest expense 930 3,990 Balance at end of period $ 1,065 (1,033 )
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 2017 2016 2015 Net income attributable to Lexington Realty Trust shareholders $ 85,583 $ 95,624 $ 111,703 Transfers from noncontrolling interests: Increase in additional paid-in-capital for redemption of noncontrolling OP units 584 210 165 Change from net income attributable to shareholders and transfers from noncontrolling interests $ 86,167 $ 95,834 $ 111,868

Benefit Plans (Tables)

Benefit Plans (Tables)	12 Months Ended
	Dec. 31, 2017
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, 2014 and 2015 1,350,410 $ 7.05 Exercised (944,169 ) 7.17 Balance at December 31, 2016 406,241 6.78 Exercised (271,451 ) 6.48 Balance at December 31, 2017 134,790 $ 7.39
Schedule of Nonvested Share Activity	Non-vested share activity for the years ended December 31, 2017 and 2016 , is as follows: Number of Shares Weighted-Average Value Per Share Balance at December 31, 2015 2,369,350 $ 9.55 Granted 1,034,019 5.23 Vested (252,059 ) 10.13 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
Schedule of Share-based Compensation, Activity	During 2017 and 2016 , the Company granted common shares to certain employees and trustees as follows: 2017 2016 Performance Shares (1) Shares issued: Index - 1Q 106,706 404,466 Peer - 1Q 106,705 404,463 Index - 2Q 163,466 — Peer - 2Q 163,463 — Grant date fair value per share: (2) Index - 1Q $6.82 $4.53 Peer - 1Q $6.34 $4.58 Index - 2Q $4.05 $— Peer - 2Q $4.27 $— Non-Vested Common Shares: (3) Shares issued 237,560 225,090 Grant date fair value $2,551 $1,724 (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. The 2Q shares were subject to shareholder approval, which was obtained in May 2017. (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, 2017
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, 2017 , 2016 and 2015 is summarized as follows: 2017 2016 2015 Current: Federal $ (107 ) $ (140 ) $ — State and local (1,810 ) (1,299 ) (645 ) NOL utilized — 59 — Deferred: Federal — (44 ) 59 State and local — (15 ) 18 $ (1,917 ) $ (1,439 ) $ (568 )
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: 2017 2016 2015 Federal provision at statutory tax rate (34%) $ (182 ) $ (154 ) $ 65 State and local taxes, net of federal benefit (40 ) (30 ) 12 Other (1,695 ) (1,255 ) (645 ) $ (1,917 ) $ (1,439 ) $ (568 )
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, 2017 , is as follows: 2017 2016 2015 Total dividends per share $ 0.700 $ 0.685 $ 0.68 Ordinary income 59.93 % 96.73 % 63.07 % Qualifying dividend 0.15 % 0.22 % — Capital gain — — — Return of capital 39.92 % 3.05 % 36.93 % 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, 2017 , is as follows: 2017 2016 2015 Total dividends per share $ 3.25 $ 3.25 $ 3.25 Ordinary income 99.75 % 99.78 % 100.00 % Qualifying dividend 0.25 % 0.22 % — Capital gain — — — Return of capital — — — 100.00 % 100.00 % 100.00 %

Unaudited Quarterly Financial47

Unaudited Quarterly Financial Data (Tables)	12 Months Ended
	Dec. 31, 2017
Condensed Income Statements, Captions [Line Items]
Schedule of Quarterly Financial Information	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 3/31/2016 6/30/2016 9/30/2016 12/31/2016 Total gross revenues $ 111,277 $ 116,912 $ 105,981 $ 95,326 Net income (loss) $ 50,453 $ 56,680 $ (27,612 ) $ 16,929 Net income (loss) attributable to common shareholders $ 47,781 $ 53,875 $ (26,975 ) $ 14,391 Net income (loss) attributable to common shareholders - basic per share $ 0.21 $ 0.23 $ (0.12 ) $ 0.06 Net income (loss) attributable to common shareholders - diluted per share $ 0.20 $ 0.23 $ (0.12 ) $ 0.06
LCIF [Member]
Condensed Income Statements, Captions [Line Items]
Schedule of Quarterly Financial Information	3/31/2017 6/30/2017 9/30/2017 12/31/2017 Total gross revenues $ 19,281 $ 20,646 $ 21,242 $ 21,604 Net income (loss) $ (470 ) $ (8 ) $ (4,422 ) $ 8,459 Net income (loss) per unit $ (0.01 ) $ — $ (0.05 ) $ 0.11 3/31/2016 6/30/2016 9/30/2016 12/31/2016 Total gross revenues $ 34,100 $ 40,772 $ 30,558 $ 18,739 Net income (loss) $ 18,027 $ 22,754 $ (61,579 ) $ 16,877 Net income (loss) per unit $ 0.22 $ 0.27 $ (0.74 ) $ 0.20

The Company (Details)

The Company (Details)	12 Months Ended
	Dec. 31, 2017Propertystate
Variable Interest Entity [Line Items]
Number of consolidated properties | Property	175
Number of states in which entity has interests | state	37
LCIF [Member]
Variable Interest Entity [Line Items]
Limited partners, ownership interest	96.00%
Number of consolidated properties | Property	32
Number of states in which entity has interests | state	20

Summary of Significant Accoun49

Summary of Significant Accounting Policies - Additional Information (Details) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2017USD ($)segment$ / shares	Dec. 31, 2016USD ($)$ / shares	Dec. 31, 2015USD ($)$ / shares
Property, Plant and Equipment [Line Items]
Vesting period (in years)	5 years
Expiration period of options (in years)	10 years
Number of operating segments | segment	1
Common shares, par value (usd per share) | $ / shares	$ 0.0001	$ 0.0001
OP unit equivalent in common shares (in unit per share)	1.13
Building and Building Improvements [Member]
Property, Plant and Equipment [Line Items]
Maximum useful life of PPE (in years)	40 years
Lake Jackson, Texas [Member] | Office Building [Member]
Property, Plant and Equipment [Line Items]
Redemption of noncontrolling interests	$ 7,951
Variable Interest Entity, Primary Beneficiary [Member] | Lake Jackson, Texas [Member] | Affiliated Entity [Member] | Office Building [Member]
Property, Plant and Equipment [Line Items]
Redemption of noncontrolling interests	$ 7,951
LCIF [Member] | Variable Interest Entity, Primary Beneficiary [Member]
Property, Plant and Equipment [Line Items]
VIE, ownership percentage	96.00%
LCIF [Member]
Property, Plant and Equipment [Line Items]
Redemption of noncontrolling interests	$ 129,990	$ 0	$ 0
Number of operating segments | segment	1
Common shares, par value (usd per share) | $ / shares	$ 0.0001
OP unit equivalent in common shares (in unit per share)	1.13
Distributions	$ 63,525	$ 66,815	$ 60,846
Distribution per weighted average unit (usd per share) | $ / shares	$ 0.77	$ 0.80	$ 0.84
LCIF [Member] | Limited Partner [Member]
Property, Plant and Equipment [Line Items]
Share price (usd per share) | $ / shares	$ 9.65
Portion of LP, fair value	$ 35,021
LCIF [Member] | Building and Building Improvements [Member]
Property, Plant and Equipment [Line Items]
Maximum useful life of PPE (in years)	40 years

Summary of Significant Accoun50

Summary of Significant Accounting Policies - Variable Interest Entities (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Variable Interest Entity [Line Items]
Real estate, net	$ 3,309,900	$ 3,028,326
Total assets	3,553,020	3,441,467
Mortgages and notes payable, net	689,810	738,047
Total liabilities	2,212,185	2,028,976
Variable Interest Entity, Primary Beneficiary [Member]
Variable Interest Entity [Line Items]
Real estate, net	682,587	778,265
Total assets	766,025	899,801
Mortgages and notes payable, net	212,792	364,099
Total liabilities	$ 226,331	$ 395,332

Earnings Per Share (Details)

Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
BASIC
Income from continuing operations attributable to common shareholders									$ 79,067	$ 89,109	$ 103,418
Income from discontinued operations attributable to common shareholders									0	0	1,682
Net income attributable to common shareholders									$ 79,067	$ 89,109	$ 105,100
Weighted-average common shares outstanding - basic (in shares)									237,758,408	233,633,058	233,455,056
Income from continuing operations, basic (usd per share)									$ 0.33	$ 0.38	$ 0.44
Income from discontinued operations, basic (usd per share)									0	0	0.01
Net income attributable to common shareholders, basic (usd per share)	$ 0.12	$ 0.02	$ 0.02	$ 0.17	$ 0.06	$ (0.12)	$ 0.23	$ 0.21	$ 0.33	$ 0.38	$ 0.45
DILUTED:
Impact of assumed conversions									$ 147	$ (159)	$ 0
Income from continuing operations attributable to common shareholders									79,214	88,950	103,418
Income from discontinued operations									0	0	1,682
Impact of assumed conversions:									0	0	0
Income from discontinued operations attributable to common shareholders									0	0	1,682
Net income attributable to common shareholders									$ 79,214	$ 88,950	$ 105,100
Weighted-average common shares outstanding - basic (in shares)									237,758,408	233,633,058	233,455,056
Effect of dilutive securities:
Share options (in shares)									86,285	230,352	296,719
Operating Partnership Units (in units)									3,693,144	3,815,621	0
Weighted-average common shares outstanding (in shares)									241,537,837	237,679,031	233,751,775
Income from continuing operations, diluted (usd per share)									$ 0.33	$ 0.37	$ 0.44
Income from discontinued operations, diluted (usd per share)									0	0	0.01
Net income attributable to common shareholders, diluted (usd per share)	$ 0.12	$ 0.02	$ 0.02	$ 0.17	$ 0.06	$ (0.12)	$ 0.23	$ 0.20	$ 0.33	$ 0.37	$ 0.45

Investments in Real Estate an52

Investments in Real Estate and Real Estate Under Construction - Schedule of Net Real Estate (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Investments in Real Estate and Real Estate Under Construction [Line Items]
Buildings and building improvements	$ 3,476,022	$ 3,050,082
Land, land estates and land improvements	456,134	472,394
Fixtures and equipment	84	5,577
Construction in progress	4,219	5,119
Real estate - intangible assets	599,091	597,294
Investments in real estate under construction	0	106,652
Real estate, gross	4,535,550	4,237,118
Accumulated depreciation and amortization	(1,225,650)	(1,208,792)
Real estate, net	3,309,900	3,028,326
Accumulated amortization	334,681	363,861
Amortization expense, next 12 months	31,401
Amortization expense, year 2	26,578
Amortization expense, year 3	23,360
Amortization expense, year 4	22,211
Amortization expense, year 5	20,951
Leases, Acquired-in-Place [Member]
Investments in Real Estate and Real Estate Under Construction [Line Items]
Real estate - intangible assets	461,624	436,185
Customer Relationships [Member]
Investments in Real Estate and Real Estate Under Construction [Line Items]
Real estate - intangible assets	97,223	113,839
Above Market Leases [Member]
Investments in Real Estate and Real Estate Under Construction [Line Items]
Real estate - intangible assets	40,244	47,270
LCIF [Member]
Investments in Real Estate and Real Estate Under Construction [Line Items]
Buildings and building improvements	705,565	644,173
Land, land estates and land improvements	88,589	86,120
Fixtures and equipment	84	84
Construction in progress	4	825
Real estate - intangible assets	116,861	104,761
Investments in real estate under construction	0	40,443
Real estate, gross	911,103	876,406
Accumulated depreciation and amortization	(233,121)	(236,930)
Real estate, net	677,982	639,476
Accumulated amortization	54,745	54,425
Amortization expense, next 12 months	5,307
Amortization expense, year 2	4,557
Amortization expense, year 3	4,445
Amortization expense, year 4	4,431
Amortization expense, year 5	4,431
LCIF [Member] | Leases, Acquired-in-Place [Member]
Investments in Real Estate and Real Estate Under Construction [Line Items]
Real estate - intangible assets	95,166	82,190
LCIF [Member] | Customer Relationships [Member]
Investments in Real Estate and Real Estate Under Construction [Line Items]
Real estate - intangible assets	19,067	19,943
LCIF [Member] | Above Market Leases [Member]
Investments in Real Estate and Real Estate Under Construction [Line Items]
Real estate - intangible assets	$ 2,628	$ 2,628

Investments in Real Estate an53

Investments in Real Estate and Real Estate Under Construction - Additional Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Investments in Real Estate and Real Estate Under Construction [Line Items]
Below-market leases, net of accretion	$ 23,308	$ 28,416
Future accretion, year 1	1,526
Future accretion, year 2	1,261
Future accretion, year 3	1,235
Future accretion, year 4	1,143
Future accretion, year 5	1,113
Acquisition related costs	2,171	836
Construction in progress	0	106,652
Change in amount of contingent consideration	3,922
Development Deals [Member]
Investments in Real Estate and Real Estate Under Construction [Line Items]
Interest costs capitalized		3,442
LCIF [Member]
Investments in Real Estate and Real Estate Under Construction [Line Items]
Below-market leases, net of accretion	32	64
Future accretion, year 1	32
Future accretion, year 2	0
Future accretion, year 3	0
Future accretion, year 4	0
Future accretion, year 5	0
Acquisition related costs	343	359
Construction in progress	$ 0	$ 40,443

Investments in Real Estate an54

Investments in Real Estate and Real Estate Under Construction - Schedule of Acquired Properties (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2017USD ($)building	Dec. 31, 2016USD ($)	Dec. 31, 2015USD ($)
Investments in Real Estate and Real Estate Under Construction [Line Items]
Initial Cost Basis	$ 727,581	$ 310,128
Land and Land Estate	31,930	29,085
Building and Improvements	625,933	250,945
Lease in-place Value	72,508	32,113
Below Market Lease	$ (2,790)	$ (2,015)
Leases, Acquired-in-Place [Member]
Investments in Real Estate and Real Estate Under Construction [Line Items]
Weighted-average life of intangible assets (years)	12 years 2 months	16 years 7 months 6 days
Leases, Acquired-in-Place, Market Adjustment [Member]
Investments in Real Estate and Real Estate Under Construction [Line Items]
Weighted-average life of intangible assets (years)	14 years 11 months	16 years 1 month 6 days
Office Property [Member] | Lake Jackson, Texas [Member]
Investments in Real Estate and Real Estate Under Construction [Line Items]
Initial Cost Basis	$ 70,401	$ 78,484
Land and Land Estate	3,078	4,357
Building and Improvements	67,323	74,127
Lease in-place Value	0	0
Below Market Lease	$ 0	0
Number of buildings completed | building	4
Redemption of noncontrolling interests	$ 7,951
Office Property [Member] | Charlotte, North Carolina [Member]
Investments in Real Estate and Real Estate Under Construction [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
Industrial Property [Member] | New Century, Kansas [Member]
Investments in Real Estate and Real Estate Under Construction [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]
Investments in Real Estate and Real Estate Under Construction [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]
Investments in Real Estate and Real Estate Under Construction [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]
Investments in Real Estate and Real Estate Under Construction [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]
Investments in Real Estate and Real Estate Under Construction [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]
Investments in Real Estate and Real Estate Under Construction [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]
Investments in Real Estate and Real Estate Under Construction [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]
Investments in Real Estate and Real Estate Under Construction [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]
Investments in Real Estate and Real Estate Under Construction [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]
Investments in Real Estate and Real Estate Under Construction [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]
Investments in Real Estate and Real Estate Under Construction [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]
Investments in Real Estate and Real Estate Under Construction [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]
Investments in Real Estate and Real Estate Under Construction [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]
Investments in Real Estate and Real Estate Under Construction [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
Industrial Property [Member] | Detroit, Michigan [Member]
Investments in Real Estate and Real Estate Under Construction [Line Items]
Initial Cost Basis		29,697
Land and Land Estate		1,133
Building and Improvements		25,009
Lease in-place Value		3,555
Below Market Lease		0
Industrial Property [Member] | Anderson, South Carolina [Member]
Investments in Real Estate and Real Estate Under Construction [Line Items]
Initial Cost Basis		61,347
Land and Land Estate		4,663
Building and Improvements		45,011
Lease in-place Value		11,673
Below Market Lease		0
Industrial Property [Member] | Wilsonville, Oregon [Member]
Investments in Real Estate and Real Estate Under Construction [Line Items]
Initial Cost Basis		43,100
Land and Land Estate		6,815
Building and Improvements		32,380
Lease in-place Value		5,920
Below Market Lease		(2,015)
Industrial Property [Member] | Romeoville, Illinois [Member]
Investments in Real Estate and Real Estate Under Construction [Line Items]
Initial Cost Basis		52,700
Land and Land Estate		7,524
Building and Improvements		40,167
Lease in-place Value		5,009
Below Market Lease		0
Industrial Property [Member] | Edwardsville, Illinois [Member]
Investments in Real Estate and Real Estate Under Construction [Line Items]
Initial Cost Basis		44,800
Land and Land Estate		4,593
Building and Improvements		34,251
Lease in-place Value		5,956
Below Market Lease		$ 0
LCIF [Member]
Investments in Real Estate and Real Estate Under Construction [Line Items]
Initial Cost Basis	132,611
Land and Land Estate	7,909
Building and Improvements	107,570
Lease in-place Value	$ 17,132
Weighted-average life of intangible assets (years)	15 years 11 months	14 years 11 months
Redemption of noncontrolling interests	$ 129,990	$ 0	$ 0
LCIF [Member] | Charlotte, North Carolina [Member]
Investments in Real Estate and Real Estate Under Construction [Line Items]
Initial Cost Basis	61,339
Land and Land Estate	3,771
Building and Improvements	47,064
Lease in-place Value	10,504
LCIF [Member] | Warren, Michigan [Member]
Investments in Real Estate and Real Estate Under Construction [Line Items]
Initial Cost Basis	46,955
Land and Land Estate	972
Building and Improvements	42,521
Lease in-place Value	3,462
LCIF [Member] | Romeoville, Illinois [Member]
Investments in Real Estate and Real Estate Under Construction [Line Items]
Initial Cost Basis		52,700
Land and Land Estate		7,524
Building and Improvements		40,167
Lease in-place Value		$ 5,009
LCIF [Member] | Grand Prairie, TX [Member]
Investments in Real Estate and Real Estate Under Construction [Line Items]
Initial Cost Basis	24,317
Land and Land Estate	3,166
Building and Improvements	17,985
Lease in-place Value	$ 3,166

Property Dispositions and Rea55

Property Dispositions and Real Estate Impairment - Additional Information (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2017USD ($)Property	Dec. 31, 2016USD ($)Property	Dec. 31, 2015USD ($)Property
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from sale of property	$ 223,853	$ 370,038	$ 156,461
Aggregate gain on sale of properties	63,428	81,510	24,884
Gain (loss) on debt extinguishment on sale of properties	$ 5,938	$ (532)	21,498
Properties classified as held-for-sale (in number of properties) | Property	1	2
Other asset impairment charges	$ 39,702	$ 100,195	36,832
LCIF [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from sale of property	17,847	238,891
Aggregate gain on sale of properties	4,491	36,380	0
Impairment charges on real estate	$ 5,259	72,072	$ 787
Number of properties sold | Property			0
Gain (loss) on debt extinguishment on sale of properties		$ 7,388
Properties classified as held-for-sale (in number of properties) | Property	0	0
Land [Member] | New York, New York [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Impairment charges on real estate		$ 65,500
Number of properties sold | Property		3
Land [Member] | New York, New York [Member] | LCIF [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Impairment charges on real estate		$ 65,500
Number of properties sold | Property		3
Office Building [Member] | LCIF [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Asset impairment charges	$ 6,802

Property Dispositions and Rea56

Property Dispositions and Real Estate Impairment - Schedule of Properties Held for Sale (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Discontinued Operations and Disposal Groups [Abstract]
Real estate, at cost	$ 2,827	$ 25,957
Real estate, intangible assets	0	7,789
Accumulated depreciation and amortization	0	(13,346)
Rent receivable - deferred	0	1,715
Other	0	1,693
Assets held for sale	2,827	23,808
Other	0	191
Liabilities held for sale	$ 0	$ 191

Loans Receivable (Details)

Loans Receivable (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Jan. 31, 2017	Jun. 30, 2015
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable, net amount		$ 94,210
Kennewick, Washington [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable, net amount		$ 85,709
Interest Rate	9.00%	9.00%
Current pay rate	8.75%
Balloon payment to be received	$ 87,245
Sold during period, percent of principal balance	94.00%
Gain (loss) on sales of loans, net	$ (5,294)
Oklahoma City, Oklahoma [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable, net amount		$ 8,501
Interest Rate		11.50%
Oklahoma City, Oklahoma [Member] | Tenant-in-Common [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable, net amount				$ 8,420
Co-venture equity ownership percentage			40.00%	40.00%
Professional fees	$ 376

Fair Value Measurements - Sche

Fair Value Measurements - Schedule of Fair Value Measurements Inputs (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Interest rate swap assets	$ 1,065	$ 44
Interest rate swap liabilities		(1,077)
Fair Value, Measurements, Nonrecurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired real estate assets	7,829	15,801
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
Interest rate swap liabilities		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	1,065	44
Interest rate swap liabilities		(1,077)
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
Interest rate swap liabilities		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	7,829	$ 15,801
LCIF [Member] | Fair Value, Measurements, Nonrecurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired real estate assets	2,090
LCIF [Member] | 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
LCIF [Member] | 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
LCIF [Member] | 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	$ 2,090

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, 2017	Dec. 31, 2016
Carrying Amount [Member]
Assets
Loans Receivable, Carrying Amount	$ 0	$ 94,210
Liabilities
Debt, Carrying Amount	2,068,867	1,860,598
Fair Value [Member]
Assets
Loans Receivable, Fair Value	0	94,911
Liabilities
Debt, Fair Value	2,013,226	1,814,824
LCIF [Member] | Carrying Amount [Member]
Liabilities
Debt, Carrying Amount	370,581	315,616
LCIF [Member] | Fair Value [Member]
Liabilities
Debt, Fair Value	$ 352,806	$ 314,509

Investment in and Advances to60

Investment in and Advances to Non-Consolidated Entities (Details)	Sep. 01, 2012USD ($)shares	Feb. 28, 2017USD ($)	Jan. 31, 2016USD ($)	Jul. 31, 2015USD ($)	Jul. 31, 2014USD ($)	Dec. 31, 2017USD ($)a	Dec. 31, 2016USD ($)	Dec. 31, 2015USD ($)	Dec. 31, 2016USD ($)	Jan. 31, 2017	Jun. 30, 2015
Investments in and Advances to Affiliates [Line Items]
Non-recourse debt						$ 96,603,000
Payments to acquire interest in joint venture						7,951,000	$ 0	$ 4,022,000
Aggregate gain on sale of properties						63,428,000	81,510,000	24,884,000
Payments to acquire equity method investments						9,898,000	37,240,000	18,900,000
Equity in earnings (losses) of non-consolidated entities						(848,000)	7,590,000	1,752,000
Joint Venture [Member]
Investments in and Advances to Affiliates [Line Items]
Payments to acquire interest in joint venture						$ 5,831,000
Area of real estate property | a						151
Russellville, Arkansas [Member] | Office Building [Member]
Investments in and Advances to Affiliates [Line Items]
Proceeds from divestiture of interest in joint venture			$ 6,681,000
Aggregate gain on sale of properties			$ 5,378,000
Palm Beach Gardens, Florida [Member]
Investments in and Advances to Affiliates [Line Items]
Impairment charges on real estate						$ 3,512,000
Philadelphia, Pennsylvania [Member] | Office Building [Member] | Joint Venture [Member]
Investments in and Advances to Affiliates [Line Items]
Payments to acquire interest in joint venture				$ 4,022,000
Houston, Texas [Member]
Investments in and Advances to Affiliates [Line Items]
Proceeds from divestiture of interest in joint venture						49,085,000
Joint ventures, construction cost									$ 79,964,000
Maximum construction financing						$ 56,686,000
Houston, Texas [Member] | Joint Venture [Member]
Investments in and Advances to Affiliates [Line Items]
Co-venture equity ownership percentage						25.00%
Oklahoma City, Oklahoma [Member] | Tenant-in-Common [Member]
Investments in and Advances to Affiliates [Line Items]
Co-venture equity ownership percentage										40.00%	40.00%
Proceeds from divestiture of interest in joint venture		$ 6,198,000
Aggregate gain on sale of properties		$ 1,452,000
LCIF [Member]
Investments in and Advances to Affiliates [Line Items]
Aggregate gain on sale of properties						$ 4,491,000	36,380,000	0
Impairment charges on real estate						5,259,000	72,072,000	787,000
Payments to acquire equity method investments						1,737,000	81,000	1,683,000
Equity in earnings (losses) of non-consolidated entities						476,000	324,000	158,000
LCIF [Member] | Net Lease Strategic Assets Fund L.P. [Member] | Equity Method Investments [Member]
Investments in and Advances to Affiliates [Line Items]
Co-venture equity ownership percentage	2.00%
Payments to acquire equity method investments	$ 189,000
Units issued (in shares) | shares	457,211
Equity method investments						6,175,000	5,224,000		$ 5,224,000
Equity in earnings (losses) of non-consolidated entities						458,000	302,000	141,000
Contributions to equity method investment						1,737,000	81,000
Proceeds from dividends received						1,244,000	781,000	636,000
LCIF [Member] | Philadelphia, Pennsylvania [Member] | Office Building [Member]
Investments in and Advances to Affiliates [Line Items]
Ownership percentage					1.00%
Payments to acquire real estate					$ 263,000
Lexington Realty Trust [Member]
Investments in and Advances to Affiliates [Line Items]
Non-recourse debt						20,886,000
Joint Venture [Member] | Houston, Texas [Member]
Investments in and Advances to Affiliates [Line Items]
Face amount						50,000,000
Lexington Reality Advisors Inc [Member]
Investments in and Advances to Affiliates [Line Items]
Investment advisory fees						$ 807,000	$ 693,000	$ 223,000
Minimum [Member]
Investments in and Advances to Affiliates [Line Items]
Co-venture equity ownership percentage						15.00%
Maximum [Member]
Investments in and Advances to Affiliates [Line Items]
Co-venture equity ownership percentage						25.00%

Mortgages and Notes Payable - S

Mortgages and Notes Payable - Schedule of Mortgages and Notes Payable (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Debt Instrument [Line Items]
Unamortized debt issuance costs	$ (7,258)
Mortgages and Notes Payable [Member]
Debt Instrument [Line Items]
Mortgages and notes payable	697,068	$ 745,173
Unamortized debt issuance costs	(7,258)	(7,126)
Long-term debt	689,810	738,047
LCIF [Member]
Debt Instrument [Line Items]
Unamortized debt issuance costs	(1,511)
LCIF [Member] | Mortgages and Notes Payable [Member]
Debt Instrument [Line Items]
Mortgages and notes payable	214,303	169,958
Unamortized debt issuance costs	(1,511)	(746)
Long-term debt	$ 212,792	$ 169,212

Mortgages and Notes Payable - A

Mortgages and Notes Payable - Additional Information (Details) - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Sep. 30, 2017
Debt Instrument [Line Items]
Debt satisfaction gains (charges), net	$ 6,196,000	$ (975,000)	$ 25,150,000
Interest paid, capitalized	$ 1,174,000	$ 4,933,000	6,062,000
Mortgages and Notes Payable [Member]
Debt Instrument [Line Items]
Weighted-average interest rate	4.60%	4.60%
Debt satisfaction gains (charges), net	$ 258,000	$ (7,000)	4,128,000
Unsecured Credit Agreement [Member] | Unsecured Debt [Member]
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity	1,105,000,000
Line of credit facility, maximum borrowing capacity with lender approval	$ 2,010,000,000
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	7.80%
Effective interest percentage		7.80%
LCIF [Member]
Debt Instrument [Line Items]
Weighted-average interest rate	4.80%	4.70%
Debt satisfaction gains (charges), net	$ 0	$ (7,388,000)	(33,000)
Interest paid, capitalized	596,000	954,000	152,000
Co-borrower debt	$ 157,789,000	$ 146,404,000
LCIF [Member] | Mortgages and Notes Payable [Member]
Debt Instrument [Line Items]
Debt satisfaction gains (charges), net			$ 33,000
LCIF [Member] | Unsecured Credit Agreement [Member] | Unsecured Debt [Member]
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity				$ 1,105,000,000
Line of credit facility, maximum borrowing capacity with lender approval				$ 2,010,000,000
LCIF [Member] | Minimum [Member]
Debt Instrument [Line Items]
Debt interest rate percentage	4.00%	4.00%
LCIF [Member] | Maximum [Member]
Debt Instrument [Line Items]
Debt interest rate percentage	6.50%	6.50%

Mortgages and Notes Payable - C

Mortgages and Notes Payable - Credit Agreement Terms (Details) - USD ($)	9 Months Ended	12 Months Ended
	Sep. 30, 2017	Dec. 31, 2017	Aug. 31, 2017	Dec. 31, 2016
Debt Instrument [Line Items]
Revolving credit facility borrowings		$ 160,000,000		$ 0
Remaining borrowing capacity		345,000,000
Debt issuance costs, net		7,258,000
Unsecured Term Loan [Member]
Debt Instrument [Line Items]
Debt issuance costs, gross		3,337,000		$ 3,907,000
Unsecured Revolving Credit Facility, Expiring August 2019 [Member] | Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Face amount		505,000,000	$ 400,000,000
Revolving credit facility borrowings		$ 160,000,000
Unsecured Term Loan, Expiring August 2020 [Member] | Minimum [Member]
Debt Instrument [Line Items]
Interest rate stated percentage rate range minimum excluding LIBOR		0.90%
Unsecured Term Loan, Expiring August 2020 [Member] | Maximum [Member]
Debt Instrument [Line Items]
Interest rate stated percentage rate range minimum excluding LIBOR		1.75%
Unsecured Term Loan, Expiring August 2020 [Member] | Unsecured Term Loan [Member]
Debt Instrument [Line Items]
Face amount		$ 300,000,000	250,000,000
Unsecured Term Loan, Expiring February 2018 [Member] | Interest Rate Swap [Member]
Debt Instrument [Line Items]
Weighted-average interest rate		1.09%
Unsecured Term Loan, Expiring February 2018 [Member] | Unsecured Term Loan [Member]
Debt Instrument [Line Items]
Face amount		$ 250,000,000
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	255,000,000
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 August 2020 [Member] | Unsecured Term Loan [Member]
Debt Instrument [Line Items]
Interest rate stated percentage rate range minimum excluding LIBOR		1.10%
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%
LCIF [Member]
Debt Instrument [Line Items]
Remaining borrowing capacity		$ 345,000,000
Weighted-average interest rate		4.80%		4.70%
Debt issuance costs, net		$ 1,511,000
LCIF [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%
LCIF [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%
LCIF [Member] | Unsecured Revolving Credit Facility, Expiring August 2019 [Member] | Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Face amount		505,000,000	400,000,000
LCIF [Member] | Unsecured Revolving Credit Facility, Expiring August 2019 [Member] | Unsecured Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Revolving credit facility borrowings		$ 160,000,000
LCIF [Member] | Unsecured Term Loan, Expiring August 2020 [Member] | Minimum [Member]
Debt Instrument [Line Items]
Interest rate stated percentage rate range minimum excluding LIBOR		0.90%
LCIF [Member] | Unsecured Term Loan, Expiring August 2020 [Member] | Maximum [Member]
Debt Instrument [Line Items]
Interest rate stated percentage rate range minimum excluding LIBOR		1.75%
LCIF [Member] | Unsecured Term Loan, Expiring August 2020 [Member] | Unsecured Term Loan [Member]
Debt Instrument [Line Items]
Face amount		$ 300,000,000	250,000,000
LCIF [Member] | Unsecured Term Loan, Expiring February 2018 [Member] | Interest Rate Swap [Member]
Debt Instrument [Line Items]
Weighted-average interest rate		1.09%
LCIF [Member] | Unsecured Term Loan, Expiring February 2018 [Member] | Unsecured Term Loan [Member]
Debt Instrument [Line Items]
Face amount		$ 250,000,000
LCIF [Member] | Unsecured Term Loan, Expiring January 2021 [Member] | Minimum [Member]
Debt Instrument [Line Items]
Interest rate stated percentage rate range minimum excluding LIBOR		0.90%
LCIF [Member] | Unsecured Term Loan, Expiring January 2021 [Member] | Maximum [Member]
Debt Instrument [Line Items]
Interest rate stated percentage rate range minimum excluding LIBOR		1.75%
LCIF [Member] | Unsecured Term Loan, Expiring January 2021 [Member] | Unsecured Term Loan [Member]
Debt Instrument [Line Items]
Face amount		$ 300,000,000	$ 255,000,000
LCIF [Member] | Unsecured Term Loan, Expiring January 2019 [Member] | Interest Rate Swap [Member]
Debt Instrument [Line Items]
Weighted-average interest rate		1.42%
LCIF [Member] | Unsecured Term Loan, Expiring January 2019 [Member] | Unsecured Term Loan [Member]
Debt Instrument [Line Items]
Face amount		$ 255,000,000
LCIF [Member] | 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%
LCIF [Member] | London Interbank Offered Rate (LIBOR) [Member] | Unsecured Term Loan, Expiring August 2020 [Member] | Unsecured Term Loan [Member]
Debt Instrument [Line Items]
Interest rate stated percentage rate range minimum excluding LIBOR		1.10%
LCIF [Member] | 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, 2017USD ($)
Debt Instrument [Line Items]
Unamortized debt issuance costs	$ (7,258)
Mortgages, Notes Payable, Credit Facility Borrowings, and Term Loans [Member]
Debt Instrument [Line Items]
2,018	35,940
2,019	270,448
2,020	355,147
2,021	340,465
2,022	30,120
Thereafter	424,948
Long-term debt, gross	1,457,068
Unamortized discount	(10,595)
Long-term debt	1,446,473
LCIF [Member]
Debt Instrument [Line Items]
Unamortized debt issuance costs	(1,511)
LCIF [Member] | Mortgages, Notes Payable, and Co-borrower Debt [Member]
Debt Instrument [Line Items]
2,018	1,124
2,019	65,767
2,020	80,875
2,021	70,864
2,022	10,016
Thereafter	143,446
Long-term debt, gross	372,092
Unamortized debt issuance costs	(1,511)
Long-term debt	$ 370,581

Senior Notes, Convertible Not65

Senior Notes, Convertible Notes and Trust Preferred Securities - Schedule of Long-term Debt Instruments (Details) - USD ($)	Dec. 31, 2017	Dec. 31, 2016	May 31, 2014	Jun. 30, 2013
Debt Instrument [Line Items]
Unamortized debt issuance costs	$ (7,258,000)
Senior Notes [Member]
Debt Instrument [Line Items]
Principal amount of debt component	500,000,000	$ 500,000,000
Unamortized debt discounts	(1,507,000)	(1,780,000)
Unamortized debt issuance costs	(3,295,000)	(3,858,000)
Long-term debt	495,198,000	494,362,000
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%	4.40%	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%	4.25%		4.25%
Issue Price	99.026%

Senior Notes, Convertible Not66

Senior Notes, Convertible Notes and Trust Preferred Securities - Narrative (Details) - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2007	May 31, 2014	Jun. 30, 2013	Dec. 31, 2010
Accounts, Notes, Loans and Financing Receivable [Line Items]
Debt satisfaction (gains) charges, net	$ (6,196,000)	$ 975,000	$ (25,150,000)
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	$ 3,828,000
Shares issued (in shares)		1,892,269	519,664
Cash payments		$ 672,000	$ 529,000
Debt satisfaction (gains) charges, net		436,000	$ 476,000
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	3.078%
Principal amount outstanding on Trust Preferred Securities	$ 129,120,000	129,120,000
Debt issuance costs, gross	1,924,000	2,024,000
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 [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Face amount	500,000,000	500,000,000
Long-term debt	495,198,000	494,362,000
Senior Notes [Member] | Senior Notes Due 2024 [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Face amount	$ 250,000,000	$ 250,000,000
Debt interest rate percentage	4.40%	4.40%			4.40%
Senior Notes [Member] | Senior Notes Due 2023 [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Face amount	$ 250,000,000	$ 250,000,000
Debt interest rate percentage	4.25%	4.25%				4.25%

Senior Notes, Convertible Not67

Senior Notes, Convertible Notes and Trust Preferred Securities - Schedule of Maturities of Long-term Debt (Details) $ in Thousands	Dec. 31, 2017USD ($)
Debt Instrument [Line Items]
Unamortized debt issuance costs	$ (7,258)
Senior Notes, Convertible Notes, and Trust Preferred Securities [Member]
Debt Instrument [Line Items]
2,018	0
2,019	0
2,020	0
2,021	0
2,022	0
Thereafter	629,120
Long-term debt, gross	629,120
Unamortized debt discounts	(1,507)
Unamortized debt issuance costs	(5,219)
Long-term debt	$ 622,394

Derivatives and Hedging Activ68

Derivatives and Hedging Activities (Details)	12 Months Ended
	Dec. 31, 2017USD ($)Financial_Instrument	Dec. 31, 2016USD ($)
Derivative [Line Items]
Expected amount of derivative related interest to be reclassified to interest expense over the next 12 months	$ 1,023,000
Interest Rate Swap [Member] | Designated as Hedging Instrument [Member] | Other Assets [Member]
Derivative [Line Items]
Derivative asset	1,065,000	$ 44,000
Interest Rate Swap [Member] | Designated as Hedging Instrument [Member] | Accounts Payable And Other Liabilities [Member]
Derivative [Line Items]
Derivative liabilities	$ 0	(1,077,000)
Cash Flow Hedging [Member] | Interest Rate Swap [Member] | Designated as Hedging Instrument [Member]
Derivative [Line Items]
Number of derivative instruments held | Financial_Instrument	10
Notional amount of derivatives	$ 505,000,000
Cash Flow Hedging [Member] | Interest Rate Swap [Member] | Designated as Hedging Instrument [Member] | Interest Expense [Member]
Derivative [Line Items]
Amount of loss recognized in OCI on derivatives (effective portion)	1,168,000	(3,084,000)
Amount of loss reclassified from Accumulated OCI into income (effective portion)	$ 930,000	$ 3,990,000

Leases (Details)

Leases (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Minimum Future Rental Receipts [Abstract]
2,018	$ 354,240
2,019	333,463
2,020	304,651
2,021	284,114
2,022	265,346
Thereafter	2,114,450
Future Minimum Payments Receivable	3,656,264
Leaseholds Interests [Member]
Future Rental Payments [Abstract]
2,018	4,330
2,019	3,887
2,020	3,886
2,021	3,829
2,022	3,893
Thereafter	28,727
Future Minimum Payments Due	48,552
Rent expense for leasehold interests	690	$ 987	$ 868
Corporate HQ and Office Space [Member]
Future Rental Payments [Abstract]
2,018	1,298
2,019	1,294
2,020	1,297
2,021	1,325
2,022	1,336
Thereafter	4,238
Rent expense for leasehold interests	1,256	1,242	1,435
LCIF [Member]
Minimum Future Rental Receipts [Abstract]
2,018	73,224
2,019	68,794
2,020	63,719
2,021	59,332
2,022	54,811
Thereafter	534,397
Future Minimum Payments Receivable	854,277
Future Rental Payments [Abstract]
Rent expense for leasehold interests	$ 171	$ 286	$ 307

Concentration of Risk (Details)

Concentration of Risk (Details)	12 Months Ended
	Dec. 31, 2017Propertyhotel	Dec. 31, 2016	Dec. 31, 2015
Concentration Risk [Line Items]
Number of properties	175
LCIF [Member]
Concentration Risk [Line Items]
Lease term (in years)	99 years
Number of properties	32
LCIF [Member] | Hotel [Member]
Concentration Risk [Line Items]
Number of properties | hotel	3
LCIF [Member] | Tenant Concentration Risk [Member] | SM Ascott LLC [Member]
Concentration Risk [Line Items]
Concentration risk percentage	0.00%	11.20%	14.70%
LCIF [Member] | Tenant Concentration Risk [Member] | Tribeca Ascott LLC [Member]
Concentration Risk [Line Items]
Concentration risk percentage	0.00%	0.00%	12.60%
LCIF [Member] | Tenant Concentration Risk [Member] | AL Stone Ground Tenant LLC [Member]
Concentration Risk [Line Items]
Concentration risk percentage	0.00%	0.00%	11.50%
LCIF [Member] | Tenant Concentration Risk [Member] | Preferred Freezer Services of Richland, LLC [Member]
Concentration Risk [Line Items]
Concentration risk percentage	17.60%	11.40%	0.00%

Equity - Additional Informatio

Equity - Additional Information (Details) - USD ($)	1 Months Ended	12 Months Ended
	Jul. 31, 2015	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Equity [Line Items]
Common shares issued through public offering and direct share purchase plan during period (in shares)		0	577,823	2,266,191
Proceeds from issuance of common shares		$ 16,804,000	$ 12,186,000	$ 19,382,000
Preferred shares outstanding (in shares)		1,935,400	1,935,400
Shares issued, net of forfeitures (in shares)		835,234	1,084,835	860,730
OP unit equivalent in common shares (in unit per share)		1.13
Shares issued for units redeemed (in shares)		140,746	48,549	32,780
Partners' capital account, exchanges and conversions		$ 584,000	$ 210,000	$ 165,000
OP units outstanding (in units)		3,223,000
Payments to acquire interest in joint venture		$ 7,951,000	$ 0	4,022,000
Joint Venture [Member]
Equity [Line Items]
Payments to acquire interest in joint venture		$ 5,831,000
Philadelphia, Pennsylvania [Member] | Office Building [Member] | Joint Venture [Member]
Equity [Line Items]
Payments to acquire interest in joint venture	$ 4,022,000
Real state, ownership percentage	100.00%
Common Shares [Member]
Equity [Line Items]
Number of shares authorized to be repurchased (in shares)	10,000,000
Repurchase of common shares (in shares)		0	1,184,113
Average cost per share (usd per share)			$ 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	$ 20,797,000
At The Market [Member]
Equity [Line Items]
Common shares issued through public offering and direct share purchase plan during period (in shares)		1,593,603	976,109	0
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) - Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member] - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Changes in Accumulated Other Comprehensive Income
Balance at beginning of period	$ (1,033)	$ (1,939)
Other comprehensive income (loss) before reclassifications	1,168	(3,084)
Amounts of loss reclassified from accumulated other comprehensive income to interest expense	930	3,990
Balance at end of period	$ 1,065	$ (1,033)

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, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Equity [Abstract]
Net income attributable to common shareholders	$ 29,235	$ 3,916	$ 5,519	$ 40,397	$ 14,391	$ (26,975)	$ 53,875	$ 47,781	$ 85,583	$ 95,624	$ 111,703
Increase in additional paid-in-capital for redemption of noncontrolling OP units									584	210	165
Change from net income attributable to shareholders and transfers from noncontrolling interests									$ 86,167	$ 95,834	$ 111,868

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, 2017USD ($)shares	Dec. 31, 2016USD ($)shares	Dec. 31, 2015USD ($)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 | $				$ 1,064	$ 2,856
Options, exercisable, intrinsic value | $				$ 305
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 | $				$ 439	$ 357	$ 333
Allocated share-based compensation expense | $				$ 8,333	$ 8,415	$ 8,201
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)				57,334	50,816	48,051
Shares issued for services, value | $				$ 596	$ 427	$ 468
Non-vested Shares [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Shares issued for services (in shares)				237,560	225,090
Non-options, nonvested, number (in shares)				3,767,298	3,151,310	2,369,350
Shares issued for services, value | $				$ 2,551	$ 1,724
Number of shares available for grant (in shares)				4,978,802
Compensation cost not yet recognized | $				$ 8,707
Total compensation cost not yet recognized, period for recognition (in years)				2 years 6 months
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)				1,769,503
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)				1,997,795

Benefit Plans - Assumptions Us

Benefit Plans - Assumptions Used (Details)	12 Months Ended
	Dec. 31, 2017$ / 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, 2017	Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Number of shares outstanding, beginning (in shares)	406,241	1,350,410
Number of shares exercised (in shares)	(271,451)	(944,169)
Number of shares outstanding, ending (in shares)	134,790	406,241
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]
Price per share outstanding, beginning (usd per share)	$ 6.78	$ 7.05
Price per share exercised (usd per share)	6.48	7.17
Price per share outstanding, ending (usd per share)	$ 7.39	$ 6.78

Benefit Plans - Non-Vested Sha

Benefit Plans - Non-Vested Share Activity (Details) - Non-vested Shares [Member] - $ / shares	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
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)	3,151,310	2,369,350
Number of shares granted (in shares)	777,900	1,034,019
Number of shares vested (in shares)	(161,912)	(252,059)
Number of shares outstanding, ending (in shares)	3,767,298	3,151,310
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)	$ 8.09	$ 9.55
Value per share granted (usd per share)	6.83	5.23
Value per share vested (usd per share)	8.90	10.13
Value per share outstanding, ending (usd per share)	$ 7.79	$ 8.09

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, 2017	Dec. 31, 2016
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)	237,560	225,090
Value per share granted (usd per share)	$ 6.83	$ 5.23
Shares issued for services, value	$ 2,551	$ 1,724
Vesting period (in years)	3 years
Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Measurement period (in years)	3 years
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)	106,706	404,466
Value per share granted (usd per share)	$ 6.82	$ 4.53
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)	106,705	404,463
Value per share granted (usd per share)	$ 6.34	$ 4.58
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	0
Value per share granted (usd per share)	$ 4.05	$ 0
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	0
Value per share granted (usd per share)	$ 4.27	$ 0

Related Party Transactions (Det

Related Party Transactions (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Related Party Transaction [Line Items]
Rent revenue	$ 359,832	$ 398,065	$ 399,485
Vorando Realty Trust [Member]
Related Party Transaction [Line Items]
Rent revenue	234	236	255
Rent expense for corporate headquarters	$ 1,179	1,176	1,323
LCIF [Member]
Related Party Transaction [Line Items]
Redemption of units (in units)	2,675,785
Redemption of units	$ 129,990
Expenses from transactions with related party	672	764	905
Rent revenue	74,707	115,403	117,847
Rent expense for corporate headquarters	171	286	307
General and administration expense	6,557	9,767	$ 8,618
LCIF [Member] | General Partner [Member]
Related Party Transaction [Line Items]
Issuance of units (in units)			12,559,130
Issuance of units			$ 112,286
LCIF [Member] | Lexington Realty Trust [Member]
Related Party Transaction [Line Items]
Due from (to) related party	(2,422)	5,967
Unit distributions earned	$ 61,072	64,319	58,361
Redemption of units (in units)	2,675,785
Distribution amount (usd per share)	$ 3.25
Redemption of units	$ 129,990
Interest expense, related party	8,237	11,392	$ 12,253
LCIF [Member] | Lexington Realty Trust [Member] | General Partner [Member]
Related Party Transaction [Line Items]
Issuance of units (in units)			12,559,130
Issuance of units			$ 112,286
LCIF [Member] | Vorando Realty Trust [Member]
Related Party Transaction [Line Items]
Rent revenue	234	$ 236	$ 255
LCIF [Member] | Affiliated Entity [Member]
Related Party Transaction [Line Items]
Notes payable, related parties	8,000
Notes payable, related parties, potential maximum amount	12,000
LCIF [Member] | Affiliated Entity [Member] | Expense Reimbursement [Member]
Related Party Transaction [Line Items]
Expenses from transactions with related party	105
LCIF [Member] | Affiliated Entity [Member] | Structuring Fee [Member]
Related Party Transaction [Line Items]
Expenses from transactions with related party	$ 120

Income Taxes - Components of I

Income Taxes - Components of Income Tax Provision (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Current:
Federal	$ (107)	$ (140)	$ 0
State and local	(1,810)	(1,299)	(645)
NOL utilized	0	59	0
Deferred:
Federal	0	(44)	59
State and local	0	(15)	18
Benefit (provision) for income taxes	$ (1,917)	$ (1,439)	$ (568)

Income Taxes - Additional Info

Income Taxes - Additional Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
State and Local Jurisdiction [Member]
Income Taxes [Line Items]
State taxes paid	$ 1,598	$ 1,252	$ 679

Income Taxes - Statutory Feder

Income Taxes - Statutory Federal Income Tax (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Tax Disclosure [Abstract]
Federal provision at statutory tax rate (34%)	$ (182)	$ (154)	$ 65
Federal tax rate	34.00%	34.00%	34.00%
State and local taxes, net of federal benefit	$ (40)	$ (30)	$ 12
Other	(1,695)	(1,255)	(645)
Benefit (provision) for income taxes	$ (1,917)	$ (1,439)	$ (568)

Income Taxes - Summary of Aver

Income Taxes - Summary of Average Taxable Nature of Dividends (Details) - $ / shares	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Common [Member]
Income Tax Contingency [Line Items]
Total dividends per share, common (usd per share)	$ 0.7	$ 0.685	$ 0.68
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	59.93%	96.73%	63.07%
Common [Member] | 15% Rate, Qualifying Dividend [Member]
Income Tax Contingency [Line Items]
Taxable percentage allocation on dividends	0.15%	0.22%	0.00%
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	39.92%	3.05%	36.93%
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	99.75%	99.78%	100.00%
Series C Cumulative Redeemable Preferred Shares [Member] | 15% Rate, Qualifying Dividend [Member]
Income Tax Contingency [Line Items]
Taxable percentage allocation on dividends	0.25%	0.22%	0.00%
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)	Oct. 06, 2017USD ($)	Sep. 16, 2015USD ($)	May 31, 2014USD ($)	Jun. 30, 2013USD ($)	Dec. 31, 2017USD ($)executive_officer	Jan. 31, 2018USD ($)	Dec. 31, 2016
Loss Contingencies [Line Items]
Number of executive officers entitled to severance benefits | executive_officer					4
Subsequent Event [Member]
Loss Contingencies [Line Items]
Maximum retirement agreement amount						$ 795,000
Senior Notes [Member] | Senior Notes Due 2024 [Member]
Loss Contingencies [Line Items]
Debt interest rate percentage			4.40%		4.40%		4.40%
Redemption price, percentage			99.883%
Senior Notes [Member] | Senior Notes Due 2023 [Member]
Loss Contingencies [Line Items]
Debt interest rate percentage				4.25%	4.25%		4.25%
Redemption price, percentage				99.026%
LCIF [Member] | Senior Notes [Member] | Senior Notes Due 2024 [Member] | Financial Guarantee [Member]
Loss Contingencies [Line Items]
Maximum guarantee exposure			$ 250,000,000
LCIF [Member] | Senior Notes [Member] | Senior Notes Due 2023 [Member] | Financial Guarantee [Member]
Loss Contingencies [Line Items]
Maximum guarantee exposure				$ 250,000,000
Maximum [Member] | LCIF [Member]
Loss Contingencies [Line Items]
Debt interest rate percentage					6.50%		6.50%
Bridgewater Hills Corporate Center, LLC [Member]
Loss Contingencies [Line Items]
Damages sought		$ 9,200,000
Amount awarded to other party	$ 2,050,000
Legal fees					$ 2,255,000
Bridgewater Hills Corporate Center, LLC [Member] | Maximum [Member]
Loss Contingencies [Line Items]
Estimate of possible loss		$ 10,000,000

Supplemental Disclosure of St85

Supplemental Disclosure of Statement of Cash Flow Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Other Significant Noncash Transactions [Line Items]
Interest paid	$ 75,069	$ 87,692	$ 88,725
Income taxes paid, net	2,340	1,240	741
Interests Sold [Member]
Other Significant Noncash Transactions [Line Items]
Loans assumed		242,269	55,000
Conveyed Interest [Member]
Other Significant Noncash Transactions [Line Items]
Mortgage loans on real estate, foreclosures	12,616	21,582	47,528
LCIF [Member]
Other Significant Noncash Transactions [Line Items]
Interest paid	15,846	27,262	28,191
Income taxes paid, net	$ 119	34	$ 60
Mortgage loan related to property sales		$ 242,269

Unaudited Quarterly Financial86

Unaudited Quarterly Financial Data (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Condensed Income Statements, Captions [Line Items]
Total gross revenues	$ 102,169	$ 97,689	$ 95,684	$ 96,099	$ 95,326	$ 105,981	$ 116,912	$ 111,277	$ 391,641	$ 429,496	$ 430,839
Net income (loss)	31,448	5,596	7,365	42,220	16,929	(27,612)	56,680	50,453	86,629	96,450	114,891
Net income attributable to common shareholders	$ 29,235	$ 3,916	$ 5,519	$ 40,397	$ 14,391	$ (26,975)	$ 53,875	$ 47,781	$ 85,583	$ 95,624	$ 111,703
Net income attributable to common shareholders - basic (in dollars per share)	$ 0.12	$ 0.02	$ 0.02	$ 0.17	$ 0.06	$ (0.12)	$ 0.23	$ 0.21	$ 0.33	$ 0.38	$ 0.45
Net income (loss) attributable to common shareholders - diluted (usd per share)	$ 0.12	$ 0.02	$ 0.02	$ 0.17	$ 0.06	$ (0.12)	$ 0.23	$ 0.20	$ 0.33	$ 0.37	$ 0.45
LCIF [Member]
Condensed Income Statements, Captions [Line Items]
Total gross revenues	$ 21,604	$ 21,242	$ 20,646	$ 19,281	$ 18,739	$ 30,558	$ 40,772	$ 34,100	$ 82,773	$ 124,169	$ 128,001
Net income (loss)	$ 8,459	$ (4,422)	$ (8)	$ (470)	$ 16,877	$ (61,579)	$ 22,754	$ 18,027	$ 3,559	$ (3,921)	$ 42,315
Net income (loss) (usd per unit)	$ 0.11	$ (0.05)	$ 0	$ (0.01)	$ 0.20	$ (0.74)	$ 0.27	$ 0.22	$ 0.04	$ (0.05)	$ 0.58

Subsequent Events (Details)

Subsequent Events (Details) - Subsequent Event [Member] $ in Thousands	2 Months Ended
	Feb. 27, 2018USD ($)property
Subsequent Event [Line Items]
Number of properties sold | property	2
Proceeds from sale of real estate | $	$ 21,000

Schedule III - Real Estate an88

Schedule III - Real Estate and Accumulated Depreciation and Amortization - Schedule III (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	$ 689,810
Land and Land Estates	456,134
Buildings and Improvements	3,476,106
Total	3,936,459	$ 3,533,172	$ 3,789,711	$ 3,671,560
Accumulated Depreciation and Amortization	890,969	844,931	812,207	795,486
Construction in progress	4,219	5,119
Unamortized debt issuance costs	$ (7,258)
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	3,553
Office Building [Member] | Phoenix, Arizona [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Land and Land Estates	5,585
Buildings and Improvements	36,923
Total	42,508
Accumulated Depreciation and Amortization	5,556
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	2,525
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	929
Office Building [Member] | Palo Alto, California [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	37,846
Land and Land Estates	12,398
Buildings and Improvements	16,977
Total	29,375
Accumulated Depreciation and Amortization	21,909
Office Building [Member] | Centenial, Colorado [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Land and Land Estates	4,851
Buildings and Improvements	19,351
Total	24,202
Accumulated Depreciation and Amortization	7,123
Office Building [Member] | Englewood, Colorado [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Land and Land Estates	2,207
Buildings and Improvements	27,851
Total	30,058
Accumulated Depreciation and Amortization	4,934
Office Building [Member] | Louisville, Colorado [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Land and Land Estates	3,657
Buildings and Improvements	11,645
Total	15,302
Accumulated Depreciation and Amortization	4,196
Office Building [Member] | Parachute, Colorado [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Land and Land Estates	1,400
Buildings and Improvements	10,751
Total	12,151
Accumulated Depreciation and Amortization	1,187
Office Building [Member] | Wallingford, Connecticut [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Land and Land Estates	1,049
Buildings and Improvements	4,773
Total	5,822
Accumulated Depreciation and Amortization	2,010
Office Building [Member] | Boca Raton, Florida [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	19,088
Land and Land Estates	4,290
Buildings and Improvements	17,160
Total	21,450
Accumulated Depreciation and Amortization	6,382
Office Building [Member] | Orlando, Florida [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Land and Land Estates	3,538
Buildings and Improvements	9,863
Total	13,401
Accumulated Depreciation and Amortization	6,737
Office Building [Member] | McDonough, Georgia [Member] | McDonough, GA Office Acquired Sep-12 [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Land and Land Estates	1,443
Buildings and Improvements	11,794
Total	13,237
Accumulated Depreciation and Amortization	2,215
Office Building [Member] | McDonough, Georgia [Member] | McDonough, GA Office Acquired Sep-12, Property 2 [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	1,372
Office Building [Member] | Meridian, Idaho [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	8,428
Land and Land Estates	2,255
Buildings and Improvements	7,797
Total	10,052
Accumulated Depreciation and Amortization	2,142
Office Building [Member] | Schaumburg, Illinois [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Land and Land Estates	5,007
Buildings and Improvements	22,340
Total	27,347
Accumulated Depreciation and Amortization	6,225
Office Building [Member] | Columbus, Indiana [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	11,842
Land and Land Estates	235
Buildings and Improvements	45,729
Total	45,964
Accumulated Depreciation and Amortization	30,595
Office Building [Member] | Indianapolis, Indiana [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Land and Land Estates	1,700
Buildings and Improvements	18,591
Total	20,291
Accumulated Depreciation and Amortization	13,777
Office Building [Member] | Lenexa, Kansas [Member] | Lenexa, KS Office Acquired Jul-08 [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	33,212
Land and Land Estates	6,909
Buildings and Improvements	41,966
Total	48,875
Accumulated Depreciation and Amortization	14,057
Office Building [Member] | Lenexa, Kansas [Member] | Lenexa, KS Office Acquired Sep-12 [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	8,631
Land and Land Estates	2,828
Buildings and Improvements	6,075
Total	8,903
Accumulated Depreciation and Amortization	1,538
Office Building [Member] | Overland Park, Kansas [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	32,828
Land and Land Estates	4,769
Buildings and Improvements	41,956
Total	46,725
Accumulated Depreciation and Amortization	15,769
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	11,085
Total	12,337
Accumulated Depreciation and Amortization	4,924
Office Building [Member] | Oakland, Maine [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	8,370
Land and Land Estates	551
Buildings and Improvements	8,774
Total	9,325
Accumulated Depreciation and Amortization	1,922
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	4,120
Office Building [Member] | Livonia, Michigan [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Land and Land Estates	935
Buildings and Improvements	13,714
Total	14,649
Accumulated Depreciation and Amortization	3,347
Office Building [Member] | Kansas City, Missouri [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	15,618
Land and Land Estates	2,433
Buildings and Improvements	20,154
Total	22,587
Accumulated Depreciation and Amortization	7,553
Office Building [Member] | Saint Joseph, Missouri [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Land and Land Estates	607
Buildings and Improvements	14,004
Total	14,611
Accumulated Depreciation and Amortization	2,355
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	868
Office Building [Member] | Charlotte, North Carolina [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	45,400
Land and Land Estates	3,771
Buildings and Improvements	47,064
Total	50,835
Accumulated Depreciation and Amortization	1,262
Office Building [Member] | Omaha, Nebraska [Member] | Omaha, NE Office Acquired Dec-13 [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Land and Land Estates	2,058
Buildings and Improvements	32,343
Total	34,401
Accumulated Depreciation and Amortization	3,856
Office Building [Member] | Omaha, Nebraska [Member] | Omaha, NE Office Acquired Nov-05 [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Land and Land Estates	2,566
Buildings and Improvements	8,324
Total	10,890
Accumulated Depreciation and Amortization	3,070
Office Building [Member] | Rockaway, New Jersey [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Land and Land Estates	4,646
Buildings and Improvements	23,143
Total	27,789
Accumulated Depreciation and Amortization	7,088
Office Building [Member] | Wall, New Jersey [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	11,924
Land and Land Estates	8,985
Buildings and Improvements	26,961
Total	35,946
Accumulated Depreciation and Amortization	14,671
Office Building [Member] | Whippany, New Jersey [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	12,704
Land and Land Estates	4,063
Buildings and Improvements	19,711
Total	23,774
Accumulated Depreciation and Amortization	9,018
Office Building [Member] | Las Vegas, Nevada [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Land and Land Estates	12,099
Buildings and Improvements	53,164
Total	65,263
Accumulated Depreciation and Amortization	14,947
Office Building [Member] | Columbus, Ohio [Member] | Columbus, OH Office Acquired Dec-10 [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Land and Land Estates	1,594
Buildings and Improvements	10,481
Total	12,075
Accumulated Depreciation and Amortization	1,834
Office Building [Member] | Columbus, Ohio [Member] | Columbus, OH Office Acquired Jul-11 [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Land and Land Estates	432
Buildings and Improvements	2,773
Total	3,205
Accumulated Depreciation and Amortization	451
Office Building [Member] | Westerville, Ohio [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Land and Land Estates	2,085
Buildings and Improvements	9,411
Total	11,496
Accumulated Depreciation and Amortization	3,322
Office Building [Member] | Eugene, Oregon [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Land and Land Estates	1,541
Buildings and Improvements	13,098
Total	14,639
Accumulated Depreciation and Amortization	2,290
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	1,913
Office Building [Member] | Jessup, Pennsylvania [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Land and Land Estates	2,520
Buildings and Improvements	17,688
Total	20,208
Accumulated Depreciation and Amortization	3,792
Office Building [Member] | Philadelphia, Pennsylvania [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Land and Land Estates	13,209
Buildings and Improvements	57,071
Total	70,280
Accumulated Depreciation and Amortization	39,639
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	622
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	26,038
Total	27,836
Accumulated Depreciation and Amortization	18,142
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	15,340
Total	18,941
Accumulated Depreciation and Amortization	5,833
Office Building [Member] | Kingsport, Tennessee [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Land and Land Estates	513
Buildings and Improvements	403
Total	916
Accumulated Depreciation and Amortization	233
Office Building [Member] | Knoxville, Tennessee [Member] | Knoxville, TN Office Acquired Sep-12 [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	1,428
Office Building [Member] | Knoxville, Tennessee [Member] | Knoxville, TN Office Acquired Mar-05 [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Land and Land Estates	1,079
Buildings and Improvements	11,351
Total	12,430
Accumulated Depreciation and Amortization	7,505
Office Building [Member] | Memphis, Tennessee [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Land and Land Estates	5,291
Buildings and Improvements	97,032
Total	102,323
Accumulated Depreciation and Amortization	27,795
Office Building [Member] | Allen, Texas [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Land and Land Estates	5,591
Buildings and Improvements	25,421
Total	31,012
Accumulated Depreciation and Amortization	10,705
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	2,980
Office Building [Member] | Carrollton, Texas [Member] | Carrollton, TX Office Acquired Jun-07 [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Land and Land Estates	2,599
Buildings and Improvements	22,050
Total	24,649
Accumulated Depreciation and Amortization	9,273
Office Building [Member] | Carrollton, Texas [Member] | Carrollton, TX Office Acquired Jun-07, Property 2 [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Land and Land Estates	828
Buildings and Improvements	0
Total	828
Accumulated Depreciation and Amortization	0
Office Building [Member] | Houston, Texas [Member] | Houston, TX Office Acquired Apr-05 [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Land and Land Estates	1,875
Buildings and Improvements	17,323
Total	19,198
Accumulated Depreciation and Amortization	8,982
Office Building [Member] | Houston, Texas [Member] | Houston, TX Office Acquired Apr-05, Property 2 [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	8,176
Office Building [Member] | Houston, Texas [Member] | Houston, TX Office Acquired Mar-04 [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Land and Land Estates	16,613
Buildings and Improvements	63,770
Total	80,383
Accumulated Depreciation and Amortization	20,604
Office Building [Member] | Irving, Texas [Member] | Irving, TX Office Acquired May-07 [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Land and Land Estates	7,476
Buildings and Improvements	45,985
Total	53,461
Accumulated Depreciation and Amortization	21,479
Office Building [Member] | Irving, Texas [Member] | Irving, TX Office Acquired Jun-07 [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Land and Land Estates	4,889
Buildings and Improvements	30,192
Total	35,081
Accumulated Depreciation and Amortization	12,645
Office Building [Member] | Lake Jackson, Texas [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	192,451
Land and Land Estates	7,435
Buildings and Improvements	141,436
Total	148,871
Accumulated Depreciation and Amortization	6,182
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	903
Office Building [Member] | San Antonio, Texas [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Land and Land Estates	2,800
Buildings and Improvements	15,619
Total	18,419
Accumulated Depreciation and Amortization	12,110
Office Building [Member] | Westlake, Texas [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Land and Land Estates	2,361
Buildings and Improvements	26,591
Total	28,952
Accumulated Depreciation and Amortization	11,913
Office Building [Member] | Hampton, Virginia [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Land and Land Estates	2,333
Buildings and Improvements	12,132
Total	14,465
Accumulated Depreciation and Amortization	5,147
Office Building [Member] | Herndon, Virginia [Member] | Herndon, VA Office Acquired Dec-99 [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	10,626
Office Building [Member] | Herndon, Virginia [Member] | Herndon, VA Office Acquired Jun-07 [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Land and Land Estates	9,409
Buildings and Improvements	14,951
Total	24,360
Accumulated Depreciation and Amortization	6,126
Office Building [Member] | Midlothian, Virginia [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Land and Land Estates	1,100
Buildings and Improvements	12,767
Total	13,867
Accumulated Depreciation and Amortization	8,601
Office Building [Member] | Richmond, Virginia [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	57,500
Land and Land Estates	7,329
Buildings and Improvements	89,810
Total	97,139
Accumulated Depreciation and Amortization	8,817
Office Building [Member] | Huntington, West Virginia [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Land and Land Estates	1,368
Buildings and Improvements	9,527
Total	10,895
Accumulated Depreciation and Amortization	1,918
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	2,369
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	7,251
Industrial Property [Member] | Opelika, Alabama [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Land and Land Estates	134
Buildings and Improvements	33,183
Total	33,317
Accumulated Depreciation and Amortization	579
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	3,371
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	6,457
Industrial Property [Member] | Lavonia, Georgia [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	7,010
Land and Land Estates	171
Buildings and Improvements	7,657
Total	7,828
Accumulated Depreciation and Amortization	1,155
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	912
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	7,188
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	995
Industrial Property [Member] | Edwardsville, Illinois [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Land and Land Estates	4,593
Buildings and Improvements	34,251
Total	38,844
Accumulated Depreciation and Amortization	1,416
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	3,579
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	2,573
Total	2,944
Accumulated Depreciation and Amortization	789
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	1,595
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	1,798
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	200
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	1,108
Industrial Property [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	1,529
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	491
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	5,453
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	890
Buildings and Improvements	26,868
Total	27,758
Accumulated Depreciation and Amortization	11,671
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	352
Buildings and Improvements	4,862
Total	5,214
Accumulated Depreciation and Amortization	2,112
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	7,453
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	5,978
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	1,014
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	2,050
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	5,892
Industrial Property [Member] | North Berwick, Maine [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	1,992
Land and Land Estates	1,383
Buildings and Improvements	35,659
Total	37,042
Accumulated Depreciation and Amortization	9,678
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	2,602
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	3,036
Industrial Property [Member] | Marshall, Michigan [Member] | Marshall, MI Industrial Acquired Sep-12 [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	2,469
Industrial Property [Member] | Marshall, Michigan [Member] | Marshall, MI Industrial Acquired Aug-87 [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Land and Land Estates	40
Buildings and Improvements	2,236
Total	2,276
Accumulated Depreciation and Amortization	1,164
Industrial Property [Member] | Plymouth, Michigan [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Land and Land Estates	2,296
Buildings and Improvements	15,819
Total	18,115
Accumulated Depreciation and Amortization	6,079
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	296
Industrial Property [Member] | Warren, Michigan [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Land and Land Estates	972
Buildings and Improvements	42,521
Total	43,493
Accumulated Depreciation and Amortization	296
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	322
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	455
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	5,131
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	9,497
Industrial Property [Member] | Olive Branch, Mississippi [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	7,283
Industrial Property [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	2,400
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	4,263
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	4,593
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	5,355
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	6,441
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	2,317
Industrial Property [Member] | Erwin, New York [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	6,991
Land and Land Estates	1,648
Buildings and Improvements	12,514
Total	14,162
Accumulated Depreciation and Amortization	2,450
Industrial Property [Member] | Long Island City, New York [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	43,334
Land and Land Estates	0
Buildings and Improvements	42,759
Total	42,759
Accumulated Depreciation and Amortization	13,737
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	2,745
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	2,785
Industrial Property [Member] | Columbus, Ohio [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Land and Land Estates	1,990
Buildings and Improvements	10,742
Total	12,732
Accumulated Depreciation and Amortization	3,837
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	7,176
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	1,827
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	3,349
Industrial Property [Member] | Streetsboro, Ohio [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	16,931
Land and Land Estates	2,441
Buildings and Improvements	25,282
Total	27,723
Accumulated Depreciation and Amortization	8,824
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	1,771
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	7,137
Industrial Property [Member] | Anderson, South Carolina [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Land and Land Estates	4,663
Buildings and Improvements	44,987
Total	49,650
Accumulated Depreciation and Amortization	3,298
Industrial Property [Member] | Chester, South Carolina [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	7,271
Land and Land Estates	1,629
Buildings and Improvements	8,470
Total	10,099
Accumulated Depreciation and Amortization	1,650
Industrial Property [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	2,393
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	7,203
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	865
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	4,218
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	2,596
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	525
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	1,244
Industrial Property [Member] | Memphis, Tennessee [Member] | Memphis, TN Industrial Acquired Feb-88 [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	11,463
Industrial Property [Member] | Memphis, Tennessee [Member] | Memphis, TN Industrial Acquired Dec-06 [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Land and Land Estates	214
Buildings and Improvements	1,902
Total	2,116
Accumulated Depreciation and Amortization	20
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	12,022
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	1,031
Industrial Property [Member] | Arlington, Texas [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Land and Land Estates	589
Buildings and Improvements	7,750
Total	8,339
Accumulated Depreciation and Amortization	1,310
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	2,138
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	390
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	5,879
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	8,568
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	4,772
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	788
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	32,501
Total	34,489
Accumulated Depreciation and Amortization	0
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	4,008
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	3,338
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	11,380
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	1,663
Other Property [Member] | Phoenix, Arizona [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Land and Land Estates	1,831
Buildings and Improvements	15,635
Total	17,466
Accumulated Depreciation and Amortization	4,918
Other Property [Member] | Manteca, California [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	187
Land and Land Estates	2,082
Buildings and Improvements	6,464
Total	8,546
Accumulated Depreciation and Amortization	2,041
Other Property [Member] | San Diego, California [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	119
Land and Land Estates	0
Buildings and Improvements	13,310
Total	13,310
Accumulated Depreciation and Amortization	3,637
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	6,755
Other Property [Member] | Albany, Georgia [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Land and Land Estates	1,468
Buildings and Improvements	5,137
Total	6,605
Accumulated Depreciation and Amortization	1,192
Other Property [Member] | Honolulu, Hawaii [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Land and Land Estates	8,259
Buildings and Improvements	7,398
Total	15,657
Accumulated Depreciation and Amortization	4,199
Other Property [Member] | Galesburg, Illinois [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	105
Land and Land Estates	91
Buildings and Improvements	250
Total	341
Accumulated Depreciation and Amortization	3
Other Property [Member] | Lawrence, Indiana [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Land and Land Estates	139
Buildings and Improvements	435
Total	574
Accumulated Depreciation and Amortization	0
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] | Jefferson, North Carolina [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Land and Land Estates	71
Buildings and Improvements	884
Total	955
Accumulated Depreciation and Amortization	281
Other Property [Member] | Thomasville, North Carolina [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Land and Land Estates	208
Buildings and Improvements	561
Total	769
Accumulated Depreciation and Amortization	104
Other Property [Member] | Vineland, New Jersey [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Land and Land Estates	2,698
Buildings and Improvements	12,790
Total	15,488
Accumulated Depreciation and Amortization	1,291
Other Property [Member] | Watertown, New York [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	176
Land and Land Estates	386
Buildings and Improvements	5,162
Total	5,548
Accumulated Depreciation and Amortization	1,713
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	538
Other Property [Member] | Charleston, South Carolina [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	6,987
Land and Land Estates	1,189
Buildings and Improvements	9,133
Total	10,322
Accumulated Depreciation and Amortization	4,244
Other Property [Member] | Florence, South Carolina [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Land and Land Estates	744
Buildings and Improvements	1,280
Total	2,024
Accumulated Depreciation and Amortization	160
Other Property [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	2,923
Other Property [Member] | Chattanooga, Tennessee [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Land and Land Estates	487
Buildings and Improvements	956
Total	1,443
Accumulated Depreciation and Amortization	175
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	220
Other Property [Member] | Farmers Branch, Texas [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Land and Land Estates	3,984
Buildings and Improvements	30,798
Total	34,782
Accumulated Depreciation and Amortization	12,375
Other Property [Member] | Houston, Texas [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Land and Land Estates	800
Buildings and Improvements	27,670
Total	28,470
Accumulated Depreciation and Amortization	21,400
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 Property [Member] | Fairlea, West Virginia [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	123
Land and Land Estates	501
Buildings and Improvements	1,985
Total	2,486
Accumulated Depreciation and Amortization	600
LCIF [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	212,792
Land and Land Estates	88,589
Buildings and Improvements	705,649
Total	794,242	731,202	1,061,606	910,113
Accumulated Depreciation and Amortization	178,376	182,505	$ 199,690	$ 176,167
Construction in progress	4	$ 825
Unamortized debt issuance costs	$ (1,511)
LCIF [Member] | Building and Improvements [Member] | Maximum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	40 years
LCIF [Member] | Office Building [Member] | Phoenix, Arizona [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	$ 0
Land and Land Estates	5,585
Buildings and Improvements	36,923
Total	42,508
Accumulated Depreciation and Amortization	5,556
LCIF [Member] | Office Building [Member] | Centenial, Colorado [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Land and Land Estates	4,851
Buildings and Improvements	19,351
Total	24,202
Accumulated Depreciation and Amortization	7,123
LCIF [Member] | Office Building [Member] | Louisville, Colorado [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Land and Land Estates	3,657
Buildings and Improvements	11,645
Total	15,302
Accumulated Depreciation and Amortization	4,196
LCIF [Member] | Office Building [Member] | Wallingford, Connecticut [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Land and Land Estates	1,049
Buildings and Improvements	4,773
Total	5,822
Accumulated Depreciation and Amortization	2,010
LCIF [Member] | Office Building [Member] | Boca Raton, Florida [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	19,088
Land and Land Estates	4,290
Buildings and Improvements	17,160
Total	21,450
Accumulated Depreciation and Amortization	6,382
LCIF [Member] | Office Building [Member] | Schaumburg, Illinois [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Land and Land Estates	5,007
Buildings and Improvements	22,340
Total	27,347
Accumulated Depreciation and Amortization	6,225
LCIF [Member] | Office Building [Member] | Overland Park, Kansas [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	32,828
Land and Land Estates	4,769
Buildings and Improvements	41,956
Total	46,725
Accumulated Depreciation and Amortization	15,769
LCIF [Member] | 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	11,085
Total	12,337
Accumulated Depreciation and Amortization	4,924
LCIF [Member] | Office Building [Member] | Charlotte, North Carolina [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	45,400
Land and Land Estates	3,771
Buildings and Improvements	47,064
Total	50,835
Accumulated Depreciation and Amortization	1,262
LCIF [Member] | 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	26,038
Total	27,836
Accumulated Depreciation and Amortization	18,142
LCIF [Member] | 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	15,340
Total	18,941
Accumulated Depreciation and Amortization	5,833
LCIF [Member] | Office Building [Member] | Carrollton, Texas [Member] | Carrollton, TX Office Acquired Jun-07 [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Land and Land Estates	2,599
Buildings and Improvements	22,050
Total	24,649
Accumulated Depreciation and Amortization	9,273
LCIF [Member] | Office Building [Member] | Carrollton, Texas [Member] | Carrollton, TX Office Acquired Jun-07, Property 2 [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Land and Land Estates	828
Buildings and Improvements	0
Total	828
Accumulated Depreciation and Amortization	0
LCIF [Member] | Office Building [Member] | Westlake, Texas [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Land and Land Estates	2,361
Buildings and Improvements	26,591
Total	28,952
Accumulated Depreciation and Amortization	11,913
LCIF [Member] | 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	10,626
LCIF [Member] | 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	7,251
LCIF [Member] | 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	6,457
LCIF [Member] | 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	1,798
LCIF [Member] | Industrial Property [Member] | Marshall, Michigan [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Land and Land Estates	40
Buildings and Improvements	2,236
Total	2,276
Accumulated Depreciation and Amortization	1,164
LCIF [Member] | Industrial Property [Member] | Warren, Michigan [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Land and Land Estates	972
Buildings and Improvements	42,521
Total	43,493
Accumulated Depreciation and Amortization	296
LCIF [Member] | Industrial Property [Member] | Byhalia, Mississippi [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	5,131
LCIF [Member] | Industrial Property [Member] | Olive Branch, Mississippi [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	7,283
LCIF [Member] | 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	18,917
Total	20,338
Accumulated Depreciation and Amortization	4,593
LCIF [Member] | 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	1,827
LCIF [Member] | 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	3,349
LCIF [Member] | 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	7,137
LCIF [Member] | Industrial Property [Member] | Grand Prairie, TX [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	390
LCIF [Member] | 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	11,380
LCIF [Member] | Other Property [Member] | Albany, Georgia [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Land and Land Estates	1,468
Buildings and Improvements	5,137
Total	6,605
Accumulated Depreciation and Amortization	1,192
LCIF [Member] | Other Property [Member] | Honolulu, Hawaii [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Land and Land Estates	8,259
Buildings and Improvements	7,398
Total	15,657
Accumulated Depreciation and Amortization	4,199
LCIF [Member] | Other Property [Member] | Vineland, New Jersey [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Land and Land Estates	2,698
Buildings and Improvements	12,790
Total	15,488
Accumulated Depreciation and Amortization	1,291
LCIF [Member] | Other Property [Member] | Charleston, South Carolina [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	6,987
Land and Land Estates	1,189
Buildings and Improvements	9,133
Total	10,322
Accumulated Depreciation and Amortization	4,244
LCIF [Member] | Other Property [Member] | Florence, South Carolina [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Land and Land Estates	744
Buildings and Improvements	1,280
Total	2,024
Accumulated Depreciation and Amortization	$ 160

Schedule III - Real Estate an89

Schedule III - Real Estate and Accumulated Depreciation and Amortization - Summary (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Real Estate and Accumulated Depreciation [Line Items]
Total cost basis for federal income tax purposes	$ 4,700,000
Reconciliation of real estate owned:
Balance at the beginning of year	3,533,172	$ 3,789,711	$ 3,671,560
Additions during year	676,355	291,004	478,717
Properties sold and impaired during the year	(270,241)	(527,597)	(343,976)
Other reclassifications	(2,827)	(19,946)	(16,590)
Balance at end of year	3,936,459	3,533,172	3,789,711
Reconciliation of accumulated depreciation and amortization:
Balance at the beginning of year	844,931	812,207	795,486
Depreciation and amortization expense	139,493	128,384	124,618
Accumulated depreciation and amortization of properties sold, impaired and held for sale during year	(93,455)	(86,428)	(106,268)
Other reclassifications	0	(9,232)	(1,629)
Balance at end of year	890,969	844,931	812,207
LCIF [Member]
Real Estate and Accumulated Depreciation [Line Items]
Total cost basis for federal income tax purposes	900,000
Reconciliation of real estate owned:
Balance at the beginning of year	731,202	1,061,606	910,113
Additions during year	123,261	49,417	152,280
Properties sold and impaired during the year	(60,221)	(379,821)	(787)
Balance at end of year	794,242	731,202	1,061,606
Reconciliation of accumulated depreciation and amortization:
Balance at the beginning of year	182,505	199,690	176,167
Depreciation and amortization expense	30,701	26,989	23,523
Accumulated depreciation and amortization of properties sold, impaired and held for sale during year	(34,830)	(44,174)	0
Balance at end of year	$ 178,376	$ 182,505	$ 199,690