LXP Industrial Trust (LXP) 10-K 26 Feb 15 2014 FY Annual report Financial data

Document_and_Entity_Informatio

Document and Entity Information (USD $)	12 Months Ended
	Dec. 31, 2014	Feb. 23, 2015	Jun. 30, 2014
Entity Information [Line Items]
Entity Registrant Name	LEXINGTON REALTY TRUST
Entity Central Index Key	910108
Current Fiscal Year End Date	-19
Entity Well-known Seasoned User	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Filer Category	Large Accelerated Filer
Entity Public Float			$2,488,377,620
Entity Common Stock, Shares Outstanding		234,819,421
Document Fiscal Year Focus	2014
Document Fiscal Period Focus	FY
Document Type	10-K
Amendment Flag	FALSE
Document Period Ended Date	31-Dec-14

CONSOLIDATED_BALANCE_SHEETS

CONSOLIDATED BALANCE SHEETS (USD $)	Dec. 31, 2014		Dec. 31, 2013
Real estate, at cost:
Real estate, at cost	$3,671,560,000		$3,812,294,000
Real estate - intangible assets	705,566,000		762,157,000
Investments in real estate under construction	106,238,000		74,350,000
Real estate, gross	4,483,364,000		4,648,801,000
Less: accumulated depreciation and amortization	1,196,114,000	[1]	1,223,381,000	[1]
Real estate, net	3,287,250,000		3,425,420,000
Assets held for sale	3,379,000		0
Cash and cash equivalents	191,077,000		77,261,000
Restricted cash	17,379,000		19,953,000
Investment in and advances to non-consolidated entities	19,402,000		18,442,000
Deferred expenses (net of accumulated amortization of $34,087 in 2014 and $28,587 in 2013)	65,860,000		66,827,000
Loans receivable, net	105,635,000		99,443,000
Rent receivable - current	6,311,000		10,087,000
Rent receivable – deferred	61,372,000		19,473,000
Other assets	20,229,000		35,375,000
Total assets	3,777,894,000		3,772,281,000
Liabilities:
Mortgages and notes payable	945,216,000		1,197,489,000
Credit facility borrowings	0		48,000,000
Term loans payable	505,000,000		406,000,000
Senior notes payable	497,675,000		247,707,000
Convertible notes payable	15,664,000		27,491,000
Trust preferred securities	129,120,000		129,120,000
Dividends payable	42,864,000		40,018,000
Liabilities held for sale	2,843,000		0
Accounts payable and other liabilities	37,740,000		39,642,000
Accrued interest payable	8,301,000		9,627,000
Deferred revenue - including below market leases (net of accumulated accretion of $35,239 in 2014 and $40,740 in 2013)	68,215,000		69,667,000
Prepaid rent	16,336,000		18,037,000
Total liabilities	2,268,974,000		2,232,798,000
Commitments and contingencies
Equity:
Common shares, par value $0.0001 per share; authorized 400,000,000 shares, 233,278,037 and 228,663,022 shares issued and outstanding in 2014 and 2013, respectively	23,000		23,000
Additional paid-in-capital	2,763,374,000		2,717,787,000
Accumulated distributions in excess of net income	-1,372,051,000		-1,300,527,000
Accumulated other comprehensive income	404,000		4,439,000
Total shareholders’ equity	1,485,766,000		1,515,738,000
Noncontrolling interests	23,154,000		23,745,000
Total equity	1,508,920,000		1,539,483,000
Total liabilities and equity	3,777,894,000		3,772,281,000
Series C [Member] | Convertible Preferred Stock [Member]
Equity:
Series C Cumulative Convertible Preferred, liquidation preference $96,770 and 1,935,400 shares issued and outstanding	$94,016,000		$94,016,000
[1]	Includes accumulated amortization of real estate intangible assets of $400,628 and $447,764 in 2014 and 2013, respectively. The estimated amortization of the above real estate intangible assets for the next five years is $35,894 in 2015, $30,221 in 2016, $26,905 in 2017, $23,179 in 2018 and $18,014 in 2019.

CONSOLIDATED_BALANCE_SHEETS_Pa

CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, except Share data, unless otherwise specified
Assets:
Accumulated amortization on deferred expenses	$34,087	$28,587
Liabilities:
Accretion on deferred revenue	35,239	40,740
Equity:
Preferred shares, par value (in dollars per share)	$0.00	$0.00
Preferred shares, authorized shares (in shares)	100,000,000	100,000,000
Common shares, par value (in dollars per share)	$0.00	$0.00
Common shares, authorized shares (in shares)	400,000,000	400,000,000
Common shares, shares issued (in shares)	233,278,037	228,663,022
Common shares, shares outstanding (in shares)	233,278,037	228,663,022
Series C [Member] | Cumulative Convertible [Member]
Equity:
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

CONSOLIDATED_STATEMENTS_OF_OPE

CONSOLIDATED STATEMENTS OF OPERATIONS (USD $)	12 Months Ended
In Thousands, except Share data, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013		Dec. 31, 2012
Gross revenues:
Rental	$392,480	$335,721		$272,343
Advisory and incentive fees	554	855		1,806
Tenant reimbursements	31,338	25,334		22,859
Total gross revenues	424,372	361,910		297,008
Expense applicable to revenues:
Depreciation and amortization	-154,837	-157,901		-134,915
Property operating	-63,673	-54,757		-48,757
General and administrative	-28,255	-28,426		-23,689
Non-operating income	13,951	8,305		6,736
Interest and amortization expense	-97,303	-85,892		-84,250
Gains on sales of financial assets, net	855	0		0
Debt satisfaction charges, net	-9,452	-25,347		-9,452
Gain on acquisition	0	0		167,864
Litigation reserve	0	0		-2,775
Impairment charges and loan losses	-37,333	-35,579		-4,262
Income (loss) before provision for income taxes, equity in earnings (losses) of non-consolidated entities and discontinued operations	48,325	-17,687		163,508
Provision for income taxes	-1,109	-3,177		-866
Equity in earnings (losses) of non-consolidated entities	626	-157		21,531
Income (loss) from continuing operations	47,842	-21,021		184,173
Discontinued operations:
Income (loss) from discontinued operations	6,252	6,244		-6,676
Provision for income taxes	-59	-1,817		-237
Debt satisfaction gains (charges), net	-312	8,905		-206
Gains on sales of properties	57,507	24,472		13,291
Impairment charges	-13,767	-12,920		-5,707
Total discontinued operations	49,621	24,884		465
Net income	97,463	3,863		184,638
Less net income attributable to noncontrolling interests	-4,359	-2,233		-4,322
Net income attributable to Lexington Realty Trust shareholders	93,104	1,630		180,316
Allocation to participating securities	-490	-656		-1,097
Net income (loss) attributable to common shareholders	86,324	-14,089		156,811
Income (loss) per common share b basic:
Income (loss) from continuing operations, basic (usd per share)	$0.17	($0.18)		$0.99
Income (loss) from discontinued operations, basic (usd per share)	$0.21	$0.11		$0
Net income (loss) attributable to common shareholders, basic (usd per share)	$0.38	($0.07)		$0.99
Weighted-average common shares outstanding b basic	228,966,253	209,797,238		159,109,424
Income (loss) per common share b diluted:
Income (loss) from continuing operations, diluted (usd per share)	$0.17	($0.18)		$0.94
Income (loss) from discontinued operations, diluted (usd per share)	$0.21	$0.11		($0.01)
Net income (loss) attributable to common shareholders, diluted (usd per share)	$0.38	($0.07)		$0.93
Weighted-average common shares outstanding b diluted	229,436,708	209,797,238		179,659,826
Amounts attributable to common shareholders:
Income (loss) from continuing operations	37,652	-38,506		157,974
Income (loss) from discontinued operations	48,672	24,417		-1,163
Net income (loss) attributable to common shareholders	86,324	-14,089		156,811
Series B [Member]
Discontinued operations:
Dividends attributable to preferred shares	0	0		-2,298
Deemed dividend	0	0	[1]	-2,346	[1]
Series C [Member]
Discontinued operations:
Dividends attributable to preferred shares	-6,290	-6,290		-6,290
Redemption discount b Series C	0	0	[1]	229	[1]
Series D [Member]
Discontinued operations:
Dividends attributable to preferred shares	0	-3,543		-11,703
Deemed dividend	$0	($5,230)	[1]	$0	[1]
[1]	Represents the difference between the redemption/repurchase cost and historical GAAP cost. Accordingly, net income (loss) was adjusted for the deemed dividends/deemed negative dividends to arrive at net income (loss) attributable to common shareholders.

CONSOLIDATED_STATEMENTS_OF_OPE1

CONSOLIDATED STATEMENTS OF OPERATIONS (Parentheticals)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Series B [Member]
Preferred dividend rate	8.05%	8.05%	8.05%
Series C [Member]
Preferred dividend rate	6.50%	6.50%	6.50%
Series D [Member]
Preferred dividend rate	7.55%	7.55%	7.55%

CONSOLIDATED_STATEMENTS_OF_COM

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Statement of Comprehensive Income [Abstract]
Net income	$97,463	$3,863	$184,638
Other comprehensive income (loss):
Change in unrealized gain (loss) on interest rate swaps, net	-4,035	10,663	-8,162
Other comprehensive income (loss)	-4,035	10,663	-8,162
Comprehensive income	93,428	14,526	176,476
Comprehensive income attributable to noncontrolling interests	-4,359	-2,233	-4,322
Comprehensive income attributable to Lexington Realty Trust shareholders	$89,069	$12,293	$172,154

CONSOLIDATED_STATEMENT_OF_CHAN

CONSOLIDATED STATEMENT OF CHANGES IN EQUITY (USD $)	Total	Preferred Stock [Member]	Common Stock [Member]	Additional Paid-in-Capital [Member]	Accumulated Distributions in Excess of Net Income [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Non-controlling Interests [Member]
In Thousands, except Share data, unless otherwise specified
Beginning balance at Dec. 31, 2011	$1,170,203	$311,673	$15	$2,010,850	($1,212,630)	$1,938	$58,357
Beginning balance (in shares) at Dec. 31, 2011		10,911,074	154,938,351
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Contributions from noncontrolling interests	1,262						1,262
Redemption of noncontrolling OP units for common shares				1,343			-1,343
Redemption of noncontrolling OP units for common shares (in shares)			257,427
Repurchase of preferred shares	-70,000	-67,883			-2,117
Repurchase of preferred shares (in shares)		-2,775,674
Issuance of common shares upon conversion of Convertible Notes	33,770		1	33,769
Issuance of common shares upon conversion of convertible notes (in shares)	4,487,060		4,487,060
Exercise of employee common share options, net	-534			-534
Exercise of employee common share options, net (in shares)			110,944
Issuance of common shares and deferred compensation amortization, net	167,523		2	167,521
Issuance of common shares and deferred compensation amortization, net (in shares)			18,822,882
Deconsolidation of consolidated joint venture	-782						-782
Dividends/distributions	-144,753				-109,372		-35,381
Net income	184,638				180,316		4,322
Other comprehensive income (loss)	-8,162					-8,162
Ending balance at Dec. 31, 2012	1,333,165	243,790	18	2,212,949	-1,143,803	-6,224	26,435
Ending balance (in shares) at Dec. 31, 2012		8,135,400	178,616,664
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Redemption of noncontrolling OP units for common shares				1,053			-1,053
Redemption of noncontrolling OP units for common shares (in shares)			202,241
Repurchase of preferred shares	-155,004	-149,774			-5,230
Repurchase of preferred shares (in shares)		-6,200,000
Issuance of common shares upon conversion of Convertible Notes	60,686		1	60,685
Issuance of common shares upon conversion of convertible notes (in shares)	7,944,673		7,944,673
Acquisition of consolidated joint venture partner's equity interest	-8,918				-8,918
Exercise of employee common share options, net	2,289			2,289
Exercise of employee common share options, net (in shares)			955,478
Forfeiture of employee common shares	-20			-20
Forfeiture of employee common shares (in shares)			-3,571
Issuance of common shares and deferred compensation amortization, net	440,835		4	440,831
Issuance of common shares and deferred compensation amortization, net (in shares)			40,947,537
Dividends/distributions	-148,076				-144,206		-3,870
Net income	3,863				1,630		2,233
Other comprehensive income (loss)	10,663					10,663
Ending balance at Dec. 31, 2013	1,539,483	94,016	23	2,717,787	-1,300,527	4,439	23,745
Ending balance (in shares) at Dec. 31, 2013		1,935,400	228,663,022
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Redemption of noncontrolling OP units for common shares	-1,962			-858			-1,104
Redemption of noncontrolling OP units for common shares (in shares)			29,086
Issuance of common shares upon conversion of Convertible Notes	14,347			14,347
Issuance of common shares upon conversion of convertible notes (in shares)	1,904,542		1,904,542
Acquisition of consolidated joint venture partner's equity interest	-2,100				-2,262		162
Exercise of employee common share options, net	597			597
Exercise of employee common share options, net (in shares)			303,852
Forfeiture of employee common shares	-57			-57
Forfeiture of employee common shares (in shares)			-13,658
Issuance of common shares and deferred compensation amortization, net	31,558			31,558
Issuance of common shares and deferred compensation amortization, net (in shares)			2,391,193
Dividends/distributions	-166,374				-162,366		-4,008
Net income	97,463				93,104		4,359
Other comprehensive income (loss)	-4,035					-4,035
Ending balance at Dec. 31, 2014	$1,508,920	$94,016	$23	$2,763,374	($1,372,051)	$404	$23,154
Ending balance (in shares) at Dec. 31, 2014		1,935,400	233,278,037

CONSOLIDATED_STATEMENTS_OF_CAS

CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Cash flows from operating activities:
Net income	$97,463	$3,863	$184,638
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	167,289	183,833	171,969
Gain on acquisition	0	0	-167,864
Gains on sales of properties	-57,507	-24,472	-13,291
Gains on sales of financial assets, net	-855	0	0
Debt satisfaction charges, net	2,859	3,989	8,062
Impairment charges and loan losses	51,100	48,499	9,969
Straight-line rents	-46,254	-23,538	-7,372
Other non-cash (income) expense, net	-390	5,248	-1,139
Equity in (earnings) losses of non-consolidated entities	-626	157	-21,531
Distributions of accumulated earnings from non-consolidated entities, net	1,381	918	7,498
Deferred taxes, net	124	752	-186
Increase (decrease) in accounts payable and other liabilities	-3,716	6,223	-598
Change in rent receivable and prepaid rent, net	617	-4,420	1,325
Decrease in accrued interest payable	-963	-1,058	-2,473
Other adjustments, net	5,384	-2,530	-2,547
Net cash provided by operating activities:	214,672	206,304	163,810
Cash flows from investing activities:
Investment in real estate, including intangible assets	-122,395	-447,571	-98,083
Investment in real estate under construction	-131,153	-106,009	-113,262
Capital expenditures	-17,681	-48,822	-49,952
Acquisition of remaining interest in NLS, net of cash acquired of $8,107	0	0	-1,331
Net proceeds from sale of properties	237,866	75,519	155,240
Principal payments received on loans receivable	44,661	2,056	6,841
Investment in loans receivable	-43,555	-60,727	-11,470
Investments in and advances to non-consolidated entities, net	-2,948	-8,193	-20,172
Proceeds from sale of interest in non-consolidated entity	0	0	7,000
Distributions from non-consolidated entities in excess of accumulated earnings	1,314	15,603	351
Increase in deferred leasing costs	-10,484	-12,060	-14,826
Proceeds from the sale of marketable equity securities	725	0	0
Investment in marketable equity securities	-689	0	0
Change in escrow deposits and restricted cash	916	-7,141	5,710
Change in real estate deposits	355	-238	-149
Net cash used in investing activities	-43,068	-597,583	-134,103
Cash flows from financing activities:
Dividends to common and preferred shareholders	-159,520	-135,539	-103,295
Repurchase of exchangeable notes	0	0	-62,150
Proceeds from senior notes	249,708	247,565	0
Conversion of convertible notes	-233	-3,270	-2,427
Principal amortization payments	-35,206	-34,446	-31,252
Principal payments on debt, excluding normal amortization	-202,262	-347,122	-288,094
Change in revolving credit facility borrowing, net	-48,000	48,000	0
Increase in deferred financing costs	-4,558	-12,307	-6,431
Proceeds of mortgages and notes payable	27,790	253,500	121,000
Proceeds from term loans	99,000	151,000	255,000
Contributions from noncontrolling interests	0	0	889
Cash distributions to noncontrolling interests	-4,008	-3,870	-35,381
Purchase of a noncontrolling interest	-2,100	-8,918	0
Repurchase of preferred shares	0	-155,004	-70,000
Redemption of noncontrolling interests	-1,962	0	0
Issuance of common shares, net	23,563	434,927	162,747
Net cash provided by (used in) financing activities	-57,788	434,516	-59,394
Change in cash and cash equivalents	113,816	43,237	-29,687
Cash and cash equivalents, at beginning of year	77,261	34,024	63,711
Cash and cash equivalents, at end of year	$191,077	$77,261	$34,024

CONSOLIDATED_STATEMENTS_OF_CAS1

CONSOLIDATED STATEMENTS OF CASH FLOWS (Parenthetical) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2012
Statement of Cash Flows [Abstract]
Cash acquired in acquisition of remaining interest in NLS	$8,107

The_Company

The Company	12 Months Ended
	Dec. 31, 2014
Organization, Consolidation and Presentation of Financial Statements [Abstract]
The Company	The Company
	Lexington Realty Trust (together with its consolidated subsidiaries, except when the context only applies to the parent entity, the “Company”) is a self-managed and self-administered Maryland statutory real estate investment trust (“REIT”) that owns a diversified portfolio of equity and debt investments in single-tenant properties and land. A majority of the real properties in which the Company has an interest and all land interests 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. The Company also provides investment advisory and asset management services to investors in the single-tenant area.
	As of December 31, 2014, the Company had equity ownership interests in approximately 215 consolidated properties located in 40 states. The properties in which the Company has an interest are leased to tenants in various industries including service, technology, finance/insurance, transportation/logistics and automotive.
	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) Lexington Realty Advisors, Inc. (“LRA”), a wholly-owned TRS, and (4) investments in joint ventures. On December 30, 2013, another operating partnership, Lepercq Corporate Income Fund II L.P. (“LCIF II”) , was merged with and into LCIF, with LCIF as the surviving entity. References to “OP Units” refer to units of limited partner interests in LCIF or LCIF II, as applicable. 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.
	The assets and credit of a property owner subsidiary or a 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_Account

Summary of Significant Accounting Policies	12 Months Ended
	Dec. 31, 2014
Accounting Policies [Abstract]
Summary of Significant Accounting Policies	Summary of Significant Accounting Policies
	Basis of Presentation and Consolidation. The Company's consolidated financial statements are prepared on the accrual basis of accounting in accordance with U.S. generally accepted accounting principles (“GAAP”). The financial statements reflect the accounts of the Company and its consolidated subsidiaries. The Company consolidates its wholly-owned subsidiaries, partnerships and joint ventures which it controls (i) through voting rights or similar rights or (ii) by means other than voting rights if the Company is the primary beneficiary of a variable interest entity ("VIE"). Entities which the Company does not control and entities which are VIEs in which the Company is not the primary beneficiary are accounted for under appropriate GAAP.
	If an investment is determined to be a VIE, the Company performs an analysis to determine if the Company is the primary beneficiary of the VIE. GAAP requires a VIE to be consolidated by its primary beneficiary. The primary beneficiary is the party that has a controlling financial interest in an entity. In order for a party to have a controlling financial interest in an entity, it must have (1) the power to direct the activities of a VIE that most significantly impact the entity's economic performance and (2) the obligation to absorb losses or the right to receive benefits of an entity that could potentially be significant to the VIE.
	At December 31, 2014 and 2013, the Company held variable interests in certain non-consolidated VIEs; however, the Company was not the primary beneficiary of these VIEs as the Company does not have a controlling financial interest in the entities. The Company has certain acquisition commitments and/ or acquisition, development and construction arrangements with VIEs. The Company is obligated to fund certain amounts as discussed in note 4.
	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, 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 current economic environment. The current economic environment has increased the degree of uncertainty inherent in these estimates and assumptions. 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 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 or deferred revenue 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.
	Accounts Receivable. The Company continuously monitors collections from tenants and makes a provision for estimated losses based upon historical experience and any specific tenant collection issues that the Company has identified. As of December 31, 2014 and 2013, the Company's allowance for doubtful accounts was not significant.
	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.
	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. The operating results of these properties are reflected as discontinued operations in the Consolidated Statements of 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 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 vest 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 with 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, 2014, 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 presentation, including certain statement of operations captions including activities for properties sold during 2014, which are presented as discontinued operations.
	Recently Issued Accounting Guidance. In April 2014, the FASB issued Accounting Standards Update No. 2014-08, Presentation of Financial Statements (Topic 205) and Property, Plant and Equipment (Topic 360): Reporting Discontinued Operations and Disclosures of Disposals of Components of an Entity, which changes the criteria for reporting discontinued operations and improves financial statement disclosures. Under this guidance, only disposals representing a strategic shift in operations that have a major effect on an organization's operations and financial results should be presented as discontinued operations. The new guidance is effective in the first quarter of 2015. It is anticipated that the implementation of this guidance will reduce the number of future property dispositions the Company makes, if any, that will be classified as discontinued operations in the Company's consolidated financial statements.
	In May 2014, the FASB issued Accounting Standards Update No. 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 new guidance is effective for reporting periods beginning after December 15, 2016. The Company is currently evaluating the impact of the adoption of the new guidance on its consolidated financial statements.
	In February 2015, the FASB issued Accounting Standards Update 2015-02, “Consolidation (Topic 810) - Amendments to the Consolidation Analysis,” which provides guidance on the consolidation evaluation for reporting organizations that are required to evaluate whether they should consolidate certain legal entities. In accordance with the guidance, all legal entities are subject to reevaluation under the revised consolidation model. The guidance is effective in the first quarter of 2016 and early adoption is allowed. The Company is currently evaluating the impact of the adoption of this new guidance on its consolidated financial statements.

Earnings_Per_Share

Earnings Per Share	12 Months Ended
	Dec. 31, 2014
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, 2014:
		2014		2013			2012
	BASIC
	Income (loss) from continuing operations attributable to common shareholders	$	37,652	$	(38,506	)	$	157,974
	Income (loss) from discontinued operations attributable to common shareholders	48,672		24,417			(1,163		)
	Net income (loss) attributable to common shareholders	$	86,324	$	(14,089	)	$	156,811
	Weighted-average number of common shares outstanding	228,966,253		209,797,238			159,109,424
	Income (loss) per common share:
	Income (loss) from continuing operations	$	0.17	$	(0.18	)	$	0.99
	Income (loss) from discontinued operations	0.21		0.11			—
	Net income (loss) attributable to common shareholders	$	0.38	$	(0.07	)	$	0.99
		2014		2013			2012
	DILUTED:
	Income (loss) from continuing operations attributable to common shareholders	$	37,652	$	(38,506	)	$	157,974
	Impact of assumed conversions:
	Share Options	—		—			—
	Operating Partnership Units	—		—			1,490
	6.00% Convertible Guaranteed Notes	—		—			8,953
	Income (loss) from continuing operations attributable to common shareholders	37,652		(38,506		)	168,417
	Income (loss) from discontinued operations attributable to common shareholders	48,672		24,417			(1,163		)
	Impact of assumed conversions:
	Operating Partnership Units	—		—			(297		)
	Income (loss) from discontinued operations attributable to common shareholders	48,672		24,417			(1,460		)
	Net income (loss) attributable to common shareholders	$	86,324	$	(14,089	)	$	166,957
	Weighted-average common shares outstanding - basic	228,966,253		209,797,238			159,109,424
	Effect of dilutive securities:
	Share Options	470,455		—			306,449
	Operating Partnership Units	—		—			4,438,708
	6.00% Convertible Guaranteed Notes	—		—			15,805,245
	Weighted-average common shares outstanding	229,436,708		209,797,238			179,659,826
	Income (loss) per common share:
	Income (loss) from continuing operations	$	0.17	$	(0.18	)	$	0.94
	Income (loss) from discontinued operations	0.21		0.11			(0.01		)
	Net income (loss) attributable to common shareholders	$	0.38	$	(0.07	)	$	0.93
	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, 2014
Real Estate Investments, Net [Abstract]
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, 2014 and 2013:
			2014				2013
	Real estate, at cost:
	Buildings and building improvements		$	2,895,585			$	3,008,709
	Land, land estates and land improvements		755,168				793,418
	Fixtures and equipment		5,861				5,861
	Construction in progress		14,946				4,306
	Real estate intangibles:
	In-place lease values		473,377				486,743
	Tenant relationships		133,796				172,640
	Above-market leases		98,393				102,774
	Investments in real estate under construction		106,238				74,350
			4,483,364				4,648,801
	Accumulated depreciation and amortization(1)		(1,196,114		)		(1,223,381		)
	Real estate, net		$	3,287,250			$	3,425,420
	-1	Includes accumulated amortization of real estate intangible assets of $400,628 and $447,764 in 2014 and 2013, respectively. The estimated amortization of the above real estate intangible assets for the next five years is $35,894 in 2015, $30,221 in 2016, $26,905 in 2017, $23,179 in 2018 and $18,014 in 2019.
	The Company had below-market leases, net of accumulated accretion, which are included in deferred revenue, of $54,414 and $59,781, respectively as of December 31, 2014 and 2013. The estimated accretion for the next five years is $4,383 in 2015, $3,312 in 2016, $2,918 in 2017, $2,911 in 2018 and $2,603 in 2019.
	The Company completed the following acquisitions and build-to-suit transactions during 2014 and 2013:
	2014:00:00
													Real Estate Intangible
	Property Type	Location	Acquisition/Completion Date	Initial Cost Basis			Lease Expiration	Land and Land Estate			Building and Improvements		Lease in-place Value
	Industrial	Rantoul, IL	Jan-14	$	41,277		Oct-33	$	1,304		$	32,562	$	7,411
	Office	Parachute, CO	Jan-14	$	13,928		Oct-32	$	1,400		$	10,751	$	1,777
	Office	Rock Hill, SC	Mar-14	$	24,715		Mar-34	$	1,601		$	18,989	$	4,125
	Industrial	Lewisburg, TN	May-14	$	13,320		Mar-26	$	173		$	10,865	$	2,282
	Industrial	North Las Vegas, NV	May-14	$	28,249		Sep-34	$	3,244		$	21,444	$	3,561
	Industrial	Bingen, WA	May-14	$	20,391		May-24	$	—		$	18,075	$	2,316
	Land	New York, NY	Oct-14	$	30,426		Oct-13	$	22,000		$	—	$	8,426
	Rehab Hospital	Vineland, NJ	Oct-14	$	19,100		Feb-43	$	2,698		$	12,790	$	3,612
	Industrial	Anniston, AL	Dec-14	$	20,907		Nov-29	$	1,201		$	16,771	$	2,935
				$	212,313			$	33,621		$	142,247	$	36,445
	Weighted-average life of intangible assets (years)												37.5
	2013:00:00
													Real Estate Intangibles
	Property Type	Location	Acquisition/Completion Date	Initial Cost Basis			Lease Expiration	Land and Land Estate			Building and Improvements		Above Market Lease Value		Lease in-place Value
	Industrial	Long Island City, NY	Feb-13	$	42,124		Mar-28	$	—		$	42,124	$	—	$	—
	Industrial	Houston, TX	Mar-13	$	81,400		Mar-38	$	15,055		$	57,949	$	—	$	8,396
	Office (1)	Denver, CO	Apr-13	$	34,547		Apr-28	$	2,207		$	26,724	$	—	$	5,616
	Retail(2)	Tuscaloosa, AL	May-13	$	8,397		May-28	$	2,793		$	5,604	$	—	$	—
	Land(3)	New York, NY	Oct-13	$	302,000		Oct-12	$	224,935		$	—	$	—	$	77,065
	Land	Danville, VA	Oct-13	$	4,727		Jan-29	$	3,454		$	—	$	673	$	600
	Retail(4)	Albany, GA	Nov-13	$	7,074		Nov-28	$	1,468		$	5,606	$	—	$	—
	Office(5)	Various	Dec-13	$	13,144		Dec-33	$	1,522		$	10,374	$	—	$	1,248
	Office	Omaha, NE	Dec-13	$	39,125		Nov-33	$	2,058		$	32,343	$	—	$	4,724
				$	532,538			$	253,492		$	180,724	$	673	$	97,649
	Weighted-average life of intangible assets (years)												15.3		82.5
	-1	The Company incurred additional tenant related costs of $3,825.
	-2	The Company incurred leasing costs of $323. The property was sold in September 2013.
	-3	Includes three properties.
	-4	The Company incurred leasing costs of $338.
	-5	Includes four properties. One property was under construction at December 31, 2013, $1,969 of construction in progress costs are included in building and improvements above.
	The Company recognized aggregate acquisition and pursuit expenses of $1,901 and $1,349 in 2014 and 2013, respectively, which are included in property operating expenses within the Company's Consolidated Statements of Operations.
	The Company is engaged in various forms of build-to-suit development activities. The Company may enter into the following acquisition, development and construction arrangements: (1) lend funds to construct build-to-suit projects subject to a single-tenant lease and agree to purchase the properties upon completion of construction and commencement of a single-tenant lease, (2) hire developers to construct built-to-suit projects on owned properties leased to single tenants, (3) fund the construction of build-to-suit projects on owned properties pursuant to the terms in single-tenant lease agreements or (4) enter into purchase and sale agreements with developers to acquire single-tenant build-to-suit properties upon completion.
	As of December 31, 2014, the Company had the following development arrangements outstanding:
	Location	Property Type	Square Feet			Expected Maximum Commitment/Contribution				Lease Term (Years)	Estimated Completion Date
	Oak Creek, WI	Industrial	164,000			$	22,609			20	2Q 15
	Thomson, GA	Industrial	208,000			$	10,245			15	2Q 15
	Richmond, VA	Office	330,000			$	110,137			15	3Q 15
	Lake Jackson, TX	Office/R&D	664,000			$	166,164			20	4Q 16
			1,366,000			$	309,155
	The Company has variable interests in certain developer entities constructing the facilities but is not the primary beneficiary of the entities as the Company does not have a controlling financial interest. As of December 31, 2014 and 2013, the Company's aggregate investment in development arrangements was $106,238 and $74,350, respectively, which includes $2,828 and $1,472 of interest capitalized, respectively, and is presented as investments in real estate under construction in the accompanying Consolidated Balance Sheets.
	On September 1, 2012, the Company, together with an operating partnership subsidiary, acquired the remaining common equity interest in Net Lease Strategic Assets Fund L.P. (“NLS”) from Inland American (Net Lease) Sub, LLC that the Company did not already own for a cash payment of $9,438 and the assumption of all outstanding liabilities. The Company recognized a gain on the transaction in the Consolidated Statement of Operations of $167,864 primarily related to the revaluation of the Company's equity interest in NLS for the difference between its carrying value in NLS and the fair value of its ownership interest at acquisition.

Sales_of_Real_Estate_and_Disco

Sales of Real Estate and Discontinued Operations	12 Months Ended
	Dec. 31, 2014
Discontinued Operations and Disposal Groups [Abstract]
Sales of Real Estate and Discontinued Operations	Sales of Real Estate and Discontinued Operations
	For the years ended December 31, 2014, 2013 and 2012, the Company disposed of its interests in certain properties (excluding Greenville, South Carolina in 2014, see note 7, and Pemlex LLC in 2012, see note 9) generating aggregate net proceeds of $226,375, $75,519 and $142,022, respectively, which resulted in gains on sales of $57,507, $24,472 and $13,291, respectively. For the years ended December 31, 2014, 2013 and 2012, the Company recognized net debt satisfaction gains (charges) relating to these properties of $(312), $8,905 and $(206), respectively. These gains (charges) are included in discontinued operations.
	At December 31, 2014, the Company had one property classified as held for sale and no properties were classified as held for sale at December 31, 2013.
	The following presents the operating results for the properties sold and held for sale during the years ended December 31, 2014, 2013 and 2012:
		Year Ending December 31,
		2014		2013		2012
	Total gross revenues	$	20,250	$	44,108	$	55,763
	Pre-tax net income, including gains on sales	$	49,680	$	26,701	$	702

Impairment_of_Real_Estate

Impairment of Real Estate	12 Months Ended
	Dec. 31, 2014
Impairment of Real Estate [Abstract]
Impairment of Real Estate Investments	Impairment of Real Estate Investments
	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 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 2014, 2013 and 2012, the Company recognized aggregate impairment charges of $34,833, $21,640 and $4,262, respectively, on real estate assets classified in continuing operations. The Company has explored the possible disposition of some non-core properties, including retail, underperforming and multi-tenant properties and determined that the expected undiscounted cash flows based upon revised estimated holding periods of certain of these properties were below the current carrying values. Accordingly, the Company reduced the carrying value of these properties to their estimated fair values. Properties impaired during 2014 and 2013 have an aggregate carrying value of $37,750 and are encumbered by an aggregate $61,763 of non-recourse mortgage debt as of December 31, 2014.
	During 2014, 2013 and 2012, the Company recognized $13,767, $12,920 and $5,707, respectively, of impairment charges in discontinued operations, relating to real estate assets that were ultimately disposed of below their carrying value.

Loans_Receivable

Loans Receivable	12 Months Ended
	Dec. 31, 2014
Loans Receivable, Net [Abstract]
Loans Receivable	Loans Receivable
	As of December 31, 2014 and 2013, the Company's loans receivable, including accrued interest and net of origination fees and loan loss reserves are comprised primarily of first and second mortgage loans and mezzanine loans on real estate.
	The following is a summary of our loans receivable as of December 31, 2014 and 2013:
			Loan carrying value(1)
	Loan		12/31/14		12/31/13		Interest Rate		Maturity Date
	Norwalk, CT(2)		$	—	$	28,186	7.5	%	Nov-14
	Homestead, FL(2)		—		10,239		7.5	%	Aug-14
	Westmont, IL(3)		12,152		12,610		6.45	%	Oct-15
	Southfield, MI(4)		3,296		6,610		4.55	%	Feb-15
	Austin, TX		2,800		2,389		16	%	Oct-18
	Kennewick, WA		85,254		37,030		9	%	May-22
	Other		2,133		2,379		8	%	2021-2022
			$	105,635	$	99,443
	-1	Loan carrying value includes accrued interest and is net of origination costs and loan losses.
	-2	Loan satisfied during 2014.
	-3	Borrowers are in default and the Company commenced foreclosure proceedings. Tenant at office property collateral terminated its lease. The Company recognized a loan loss of $13,939 during 2013. During 2014 and 2013, the Company recognized $1,284 and $1,737, respectively, of interest income relating to the impaired loan and the loan had an average recorded investment value of $12,812 and $25,562 during 2014 and 2013, respectively. At December 31, 2014, the impaired loan receivable had a contractual unpaid balance of $26,786.
	-4	The Company recorded a $2,500 loan loss in 2014 as the Company determined it was probable that it would not collect the amount owed at maturity. During 2014, the Company recognized $468 of interest income relating to the impaired loan and the loan had an average recorded investment of $6,001 during 2014. At December 31, 2014, the impaired loan receivable had a contractual unpaid balance of $5,810.
	The Company had a loan secured by a property in Schaumburg, Illinois. The borrower defaulted on the loan. The Company did not record interest of $2,939 and $2,647 in 2013 and 2012, respectively, representing the interest earned since default. In 2013, the Company foreclosed on the borrower and acquired the office property collateral, which is net leased through December 2022.
	The Company had two types of financing receivables: loans receivable and a capitalized financing lease. The Company determined that its financing receivables operated within one portfolio segment as they were both within the same industry and use the same impairment methodology. The Company's loans receivable are secured by commercial real estate assets and the capitalized financing lease, for a commercial office property located in Greenville, South Carolina, was sold in December 2014 for net proceeds of $11,491. In addition, the Company assesses all financing receivables for impairment, when warranted, based on an individual analysis of each receivable.
	The Company's financing receivables operate within one class of financing receivables as these assets are collateralized by commercial real estate and similar metrics are used to monitor the risk and performance of these assets. The Company's management uses credit quality indicators to monitor financing receivables such as quality of collateral, the underlying tenant's credit rating and collection experience. As of December 31, 2014, the financing receivables were performing as anticipated other than as discussed above and there were no other significant delinquent amounts outstanding.

Fair_Value_Measurements

Fair Value Measurements	12 Months Ended
	Dec. 31, 2014
Fair Value Disclosures [Abstract]
Fair Value Measurements	Fair Value Measurements
	The following tables present the Company's assets and liabilities from continuing operations measured at fair value on a recurring basis as of December 31, 2014 and 2013 and non-recurring basis during the year ended December 31, 2014 and 2013, aggregated by the level in the fair value hierarchy within which those measurements fall:
					Fair Value Measurements Using
	Description	2014			(Level 1)		(Level 2)			(Level 3)
	Interest rate swap assets	$	1,153		$	—	$	1,153		$	—
	Impaired real estate assets*	$	25,679		$	—	$	—		$	25,679
	Impaired loan receivable*	$	3,296		$	—	$	—		$	3,296
	Interest rate swap liabilities	$	(749	)	$	—	$	(749	)	$	—
	*Represents a non-recurring fair value measurement.
					Fair Value Measurements Using
	Description	2013			(Level 1)		(Level 2)			(Level 3)
	Interest rate swap assets	$	4,439		$	—	$	4,439		$	—
	Impaired real estate assets*	$	12,549		$	—	$	—		$	12,549
	Impaired loan receivable*	$	12,610		$	—	$	—		$	12,610
	Impaired investments in and advances to non-consolidated entities*	$	683		$	—	$	—		$	683
	*Represents a non-recurring fair value measurement.
	The table below sets forth the carrying amounts and estimated fair values of the Company's financial instruments as of December 31, 2014 and 2013:
		As of December 31, 2014					As of December 31, 2013
		Carrying			Fair Value		Carrying			Fair Value
		Amount					Amount
	Assets
	Loans Receivable (Level 3)	$	105,635		$	105,061	$	99,443		$	95,734
	Liabilities
	Debt (Level 3)	$	2,092,675		$	2,091,364	$	2,055,807		$	2,028,558
	The majority of the inputs used to value the Company's interest rate swap asset (liability) 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 liability 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, 2014 and 2013, the Company determined that the credit valuation adjustment relative to the overall interest rate swap asset (liability) is not significant. As a result, the entire interest rate swap asset (liability) has 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 sales data for similar assets 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 estimates the fair values of its loans receivable 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 estimated by using a discounted cash flow analysis, based upon estimates of market interest rates.
	Fair values cannot be determined with precision, may not be substantiated by comparison to quoted prices in active markets and may not be realized upon sale. Additionally, there are inherent uncertainties in any fair value measurement technique, and changes in the underlying assumptions used, including discount rates, liquidity risks and estimates of future cash flows, could significantly affect the fair value measurement amounts.
	Cash Equivalents, Restricted Cash, Accounts Receivable and Accounts Payable. The Company estimates that the fair value of cash equivalents, restricted cash, accounts receivable and accounts payable approximates carrying value due to the relatively short maturity of the instruments.

Investment_in_and_Advances_to_

Investment in and Advances to Non-Consolidated Entities	12 Months Ended
	Dec. 31, 2014
Equity Method Investments and Joint Ventures [Abstract]
Investment in and Advances to Non-Consolidated Entities	Investment in and Advances to Non-Consolidated Entities
	In November 2014, the Company formed a joint venture to construct a private school in Houston, Texas. The Company currently has a 25% interest in the joint venture. The anticipated total construction cost is $86,491. The Company may provide construction financing up to $56,686. Upon completion, the property will be net leased for a 20-year term.
	In October 2013, the Company formed a joint venture, in which the Company has a 15.0% interest, that acquired a portfolio of veterinary hospitals for $39,456, which are net leased for a 20-year term. The acquisition was partially funded by a $18,791 non-recourse mortgage loan with a fixed interest rate of 4.01% and maturity of November 2018.
	In August 2013, the Company invested $5,000 in a joint venture, which acquired the fee interest and the related office building improvements of a property in Baltimore, Maryland. Beginning in October 2015, the Company has the right to require the redemption of its interest in the joint venture in exchange for a distribution to the Company of the fee interest, which is currently leased for a 99-year term to the joint venture.
	During 2012, the Company formed two joint ventures in which it has a minority interest. One joint venture acquired a retail property in Palm Beach Gardens, Florida for $29,750 which was net leased for an approximate 15-year term. The Company had a 36% interest in the venture and provided a $12,000 non-recourse mortgage loan to the venture which was repaid in full in February 2013. The Company received a distribution of $2,557 in March 2013, a portion of which represented a return of capital reducing the Company's ownership interest to 25%.
	The second joint venture, in which the Company has a 15% interest, acquired a 100% economic interest in an inpatient rehabilitation hospital in Humble, Texas for $27,750, which was net leased for an approximate 17-year term. The acquisition was partially funded by a non-recourse mortgage with an original principal amount of $15,260, which bears interest at a fixed rate of 4.7% and matures in May 2017.
	In July 2012, the Company sold its interest in Pemlex LLC, a consolidated subsidiary, for $13,218 in connection with its restructuring. No gain or loss was recognized in the transaction as the investment was sold at its cost basis.
	The Company's investments in Concord Debt Holding LLC and CDH CDO LLC were valued at zero and the Company recognized income on the cash basis. During 2012, the Company sold all of its interest in Concord Debt Holding LLC and CDH CDO LLC for $7,000 in cash.
	Other. During 2014 and 2013, the Company recognized other-than-temporary impairment charges on a non-consolidated joint venture due to changes in the Company's estimate of net proceeds to be received upon liquidation of the joint venture. Accordingly, the Company recognized $930 and $925, respectively, in impairment charges in equity in earnings (losses) of non-consolidated entities. The underlying property was sold in October 2014 and the Company recognized a gain of $87 in equity in earnings (losses) of non-consolidated entities.
	The Company's remaining equity method investments consist of interests in five partnerships with ownership percentages ranging between 27% and 40%, which own primarily net-leased properties. All profits, losses and cash flows are distributed in accordance with the respective partnership agreements. One partnership is encumbered by $13,757 in mortgage debt (the Company's proportionate share is $5,503) with an interest rate of 5.2% and a maturity date of May 2015.
	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, including NLS, were $417, $512 and $875 for the years ended December 31, 2014, 2013 and 2012, respectively.

Mortgages_and_Notes_Payable

Mortgages and Notes Payable	12 Months Ended
	Dec. 31, 2014
Mortgages and Notes Payable [Abstract]
Mortgages and Notes Payable	Mortgages and Notes Payable
	The Company had outstanding mortgages and notes payable of $945,216 and $1,197,489 as of December 31, 2014 and 2013, respectively. Interest rates, including imputed rates on mortgages and notes payable, ranged from 2.2% to 8.5% at December 31, 2014 and the mortgages and notes payable mature between 2014 and 2027. Interest rates, including imputed rates, ranged from 3.6% to 8.5% at December 31, 2013. The weighted-average interest rate at December 31, 2014 and 2013 was approximately 5.2% and 5.3%, respectively.
	The Company has a $400,000 unsecured revolving credit facility with KeyBank National Association (“KeyBank”), as agent. The unsecured revolving credit facility matures in February 2017 but can be extended until February 2018 at the Company’s option. The unsecured revolving credit facility bears interest at LIBOR plus 0.95% to 1.725% (1.15% as of December 31, 2014). At December 31, 2014, the unsecured revolving credit facility had no amounts outstanding, outstanding letters of credit of $14,644 and availability of $385,356, subject to covenant compliance.
	The Company also has a five-year $250,000 unsecured term loan facility from KeyBank, as agent. The unsecured term loan matures in February 2018, requires regular payments of interest only at interest rates ranging from LIBOR plus 1.10% to 2.10% (1.35% as of December 31, 2014). The Company entered into interest rate swap agreements to fix the LIBOR component at a weighted-average rate of 1.09% through February 2018 on the $250,000 of outstanding LIBOR-based borrowings.
	In addition, the Company also has a $255,000 unsecured term loan from Wells Fargo Bank, National Association (“Wells Fargo”), as agent. The term loan matures in January 2019. The term loan requires regular payments of interest only at interest rates ranging from LIBOR plus 1.50% to 2.25% (1.75% as of December 31, 2014). The Company may prepay any outstanding borrowings under the term loan facility at a premium through January 12, 2016 and at par thereafter. The Company entered into interest rate swap agreements to fix the LIBOR component at a weighted-average rate of 1.42% through January 2019 on the $255,000 of outstanding LIBOR-based borrowings.
	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, 2014.
	The Company had $25,000 and $35,551 secured term loans with KeyBank, which were satisfied in January 2012 and the Company recognized debt satisfaction charges of $1,578 as a result of the satisfaction.
	Included in the Consolidated Statements of Operations, the Company recognized debt satisfaction gains (charges), net, excluding discontinued operations, of $(7,016), $(11,811) and $12 for the years ended December 31, 2014, 2013 and 2012, respectively, due to the satisfaction of mortgages and notes payable other than those disclosed elsewhere in these financial statements. In addition, the Company capitalized $3,441, $2,397 and $3,062 in interest, including discontinued operations, for the years ended 2014, 2013 and 2012, respectively.
	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, notes payable, credit facility borrowings and term loans for the next five years and thereafter are as follows:
	Year ending December 31,	Total
	2015	$	170,440
	2016	154,337
	2017	93,469
	2018	292,297
	2019	358,835
	Thereafter	380,838
		$	1,450,216

Senior_Notes_Convertible_Notes

Senior Notes, Convertible Notes, Exchangeable Notes and Trust Preferred Securities	12 Months Ended
	Dec. 31, 2014
Debt Disclosure [Abstract]
Senior Notes, Convertible Notes, Exchangeable Notes and Trust Preferred Securities	Senior Notes, Convertible Notes, Exchangeable Notes and Trust Preferred Securities
	The Company had the following Senior Notes outstanding as of December 31, 2014:
	Issue Date		Face Amount				Interest Rate		Maturity Date		Issue Price
	May-14		$	250,000			4.4	%	Jun-24		99.883	%
	Jun-13		250,000				4.25	%	Jun-23		99.026	%
			$	500,000
	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 pay interest semi-annually in arrears and mature in January 2030. The holders of the notes may require the Company to repurchase their notes in January 2017, January 2020 and January 2025 for cash equal to 100% of the notes to be repurchased, plus any accrued and unpaid interest. The Company may not redeem any notes prior to January 2017, except to preserve its REIT status. As of the date of filing this Annual Report, the notes have a conversion rate of 151.5965 common shares per one thousand principal amount of the notes, representing a conversion price of approximately $6.60 per common share. The conversion rate is subject to adjustment under certain circumstances, including increases in the Company's dividend rate above a certain threshold and the issuance of stock dividends. The notes are convertible by the holders under certain circumstances for cash, common shares or a combination of cash and common shares at the Company's election. The notes are convertible prior to the close of business on the second business day immediately preceding the stated maturity date, at any time beginning in January 2029 and also upon the occurrence of specified events. During 2014, 2013 and 2012, $12,763, $54,905 and $31,104 aggregate principal amount of the notes were converted for 1,904,542, 7,944,673 and 4,487,060 common shares and an aggregate cash payment of $233, $3,270 and $2,427 plus accrued and unpaid interest, respectively. The Company recognized aggregate debt satisfaction charges of $2,436, $13,536 and $7,842, during 2014, 2013 and 2012, respectively, relating to the conversions.
	In 2013, the Company obtained the release of all guarantees, other than the Company's operating partnership, under the indentures for the 4.25% Senior Notes and the 6.00% Convertible Guaranteed Notes, the term loan agreements and the unsecured revolving credit facility.
	During 2007, the Company issued an aggregate $450,000 of 5.45% Exchangeable Guaranteed Notes due in 2027. During 2012, the Company repurchased and retired all remaining outstanding original principal amount of the notes for a cash payment of $62,150. This resulted in debt satisfaction charges, net of $44.
	Below is a summary of additional disclosures related to the 6.00% Convertible Guaranteed Notes and the 5.45% Exchangeable Guaranteed Notes.
		6.00% Convertible Guaranteed Notes
	Balance Sheets:	December 31, 2014				December 31, 2013
	Principal amount of debt component	$	16,228			$	28,991
	Unamortized discount	(564		)		(1,500		)
	Carrying amount of debt component	$	15,664			$	27,491
	Carrying amount of equity component	$	(33,160	)		$	(26,032	)
	Effective interest rate	8.1		%		8.1		%
	Period through which discount is being amortized, put date	Jan-17				Jan-17
	Aggregate if-converted value in excess of aggregate principal amount	$	10,432			$	14,296
	Statements of Operations:		2014				2013			2012
	6.00% Convertible Guaranteed Notes
	Coupon interest		$	1,545			$	2,296		$	6,634
	Discount amortization		438				658			1,868
			$	1,983			$	2,954		$	8,502
	5.45% Exchangeable Guaranteed Notes
	Coupon interest		$	—			$	—		$	188
	Discount amortization		—				—			34
			$	—			$	—		$	222
	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, were open for redemption at the Company's option commencing April 2012 and bear interest at a fixed rate of 6.804% through April 2017 and thereafter, at a variable rate of three month LIBOR plus 170 basis points through maturity. As of December 31, 2014 and 2013, there was $129,120 original principal amount of Trust Preferred Securities outstanding.
	Scheduled principal payments for these debt instruments for the next five years and thereafter are as follows:
	Year ending December 31,		Total
	2015		$	—
	2016		—
	2017(1)		16,228
	2018		—
	2019		—
	Thereafter		629,120
			645,348
	Debt discounts		(2,889		)
			$	642,459
	-1	Although the 6.00% Convertible Guaranteed Notes mature in 2030, the notes can be put to the Company in 2017.

Derivatives_and_Hedging_Activi

Derivatives and Hedging Activities

12 Months Ended

Dec. 31, 2014

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 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 secured 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. In 2012, the Company settled the 2008 interest rate swap agreement with KeyBank for $3,539. The Company had a credit balance of $1,837 in accumulated other comprehensive income at the settlement date which was amortized into earnings on a straight-line basis through February 2013.

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 $4,737 will be reclassified as an increase to interest expense if the swaps remain outstanding.

As of December 31, 2014, 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, 2014 and 2013.

As of December 31, 2014

As of December 31, 2013

Balance Sheet Location

Fair Value

Balance Sheet Location

Fair Value

Derivatives designated as hedging instruments:

Interest Rate Swap Asset

Other Assets

$

1,153

Other Assets

$

4,439

Interest Rate Swap Liability

Accounts Payable and Other Liabilities

$

(749

)

The tables below present the effect of the Company's derivative financial instruments on the Consolidated Statements of Operations for 2014 and 2013:

Derivatives in Cash Flow

Amount of Gain (Loss) Recognized

Location of Loss

Amount of Loss Reclassified

in OCI on Derivative

Reclassified from

from Accumulated OCI into

(Effective Portion)

Accumulated OCI into Income (Effective Portion)

Income (Effective Portion)

December 31,

December 31,

Hedging Relationships

2014

2013

2014

2013

Interest Rate Swap

$

(9,560

)

$

7,559

Interest expense

$

5,525

$

3,104

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, 2014, the Company had not posted any collateral related to the agreements.

Leases

Leases	12 Months Ended
	Dec. 31, 2014
Leases [Abstract]
Leases	Leases
	Lessor:
	Minimum future rental receipts under the non-cancelable portion of tenant leases, assuming no new or re-negotiated leases, for the next five years and thereafter are as follows:
	Year ending	Total
	December 31,
	2015	$	341,950
	2016	327,046
	2017	300,418
	2018	275,572
	2019	248,604
	Thereafter	6,203,163
		$	7,696,753
	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	Total
	December 31,
	2015	$	5,137
	2016	4,927
	2017	4,880
	2018	4,664
	2019	4,134
	Thereafter	37,963
		$	61,705
	Rent expense for the leasehold interests, including discontinued operations, was $919, $1,284 and $1,198 in 2014, 2013 and 2012, 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. As an incentive to enter the lease, the Company received a payment of $845 which it is amortizing as a reduction of rent expense. In addition, the Company leases office space for its regional offices. The minimum lease payments for the Company's offices are $1,261 for 2015, $506 for 2016, $1,256 for 2017, $1,224 for 2018 and $1,224 for 2019 and $8,019 thereafter. Rent expense for 2014, 2013 and 2012 was $1,356, $1,338 and $1,029, respectively.

Concentration_of_Risk

Concentration of Risk	12 Months Ended
	Dec. 31, 2014
Risks and Uncertainties [Abstract]
Concentration of Risk	Concentration of Risk
	The Company seeks to reduce its operating and leasing risks through the geographic diversification of its properties, tenant industry diversification, avoidance of dependency on a single asset and the creditworthiness of its tenants. For the years ended December 31, 2014, 2013 and 2012, no single tenant represented greater than 10% of rental revenues.
	Cash and cash equivalent balances at certain institutions may exceed insurable amounts. The Company believes it mitigates this risk by investing in or through major financial institutions.

Equity

Equity	12 Months Ended
	Dec. 31, 2014
Equity [Abstract]
Equity	Equity
	Shareholders' Equity:
	During 2014, 2013 and 2012, the Company issued 2,600,795, 36,012,313 and 18,289,557 common shares, respectively, through public offerings and under its direct share purchase plan, raising net proceeds of approximately $25,813, $399,566 and $164,429 respectively. During 2013, the Company implemented an At-The-Market offering program under which the Company may issue up to $100,000 in common shares over the term of this program. The Company issued 3,409,927 common shares under this program during 2013 and generated aggregate gross proceeds of $36,884. 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, 2014. 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 the date of filing this Annual Report, 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 2014, 2013 and 2012, the Company issued 37,678, 1,893,409 and 643,450 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 16).
	During 2013 and 2012, the Company repurchased/redeemed and retired the following shares of its preferred stock:
			2013				2012
	8.05% Series B Cumulative Redeemable Preferred Stock:
	Shares redeemed and retired		—				2,740,874
	Redemption cost(1)		$	—			$	69,459
	Deemed dividend(2)		$	—			$	2,346
	6.50% Series C Cumulative Convertible Preferred Stock:
	Shares repurchased and retired		—				34,800
	Repurchase cost		$	—			$	1,462
	Discount (Deemed negative dividend)(2)		$	—			$	(229	)
	7.55% Series D Cumulative Redeemable Preferred Stock:
	Shares redeemed and retired		6,200,000				—
	Redemption cost(1)		$	155,621			$	—
	Deemed dividend(2)		$	5,230			$	—
	-1	Includes accrued and unpaid dividends.
	-2	Represents the difference between the redemption/repurchase cost and historical GAAP cost. Accordingly, net income (loss) was adjusted for the deemed dividends/deemed negative dividends to arrive at net income (loss) attributable to common shareholders.
	Accumulated other comprehensive income as of December 31, 2014 and 2013 represented $404 and $4,439, respectively, of unrealized gain on interest rate swaps, net.
	Changes in Accumulated Other Comprehensive Income
			Gains and Losses
			on Cash Flow Hedges
	Balance December 31, 2013		$	4,439
	Other comprehensive loss before reclassifications		(9,560		)
	Amounts of loss reclassified from accumulated other comprehensive loss to interest expense		5,525
	Balance December 31, 2014		$	404
	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 2014, in connection with the merger of LCIF II with and into LCIF, former LCIF II partners representing 170,193 OP units elected or were deemed to elect to receive $1,962 in aggregate cash for such OP units.
	During 2014, 2013 and 2012, 29,086, 202,241 and 257,427 common shares, respectively, were issued by the Company, in connection with OP unit redemptions, for an aggregate value of $148, $1,053 and $1,343, respectively.
	As of December 31, 2014, there were approximately 3,422,000 OP units outstanding other than OP units owned by the Company. All OP units receive distributions in accordance with their respective partnership agreements. To the extent that the Company's dividend per common share is less than the stated distribution per OP unit per the applicable 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
		2014				2013				2012
	Net income attributable to Lexington Realty Trust shareholders	$	93,104			$	1,630			$	180,316
	Transfers from noncontrolling interests:
	Increase (decrease) in additional paid-in-capital for redemption of noncontrolling OP units	(858		)		1,053				1,343
	Change from net income attributable to shareholders and transfers from noncontrolling interests	$	92,246			$	2,683			$	181,659
	In July 2014, the Company acquired a consolidated joint venture partner's interest in an office property in Philadelphia, Pennsylvania for $2,100 raising the Company's equity ownership in the office property from 80.5% to 87.5%. In July 2013, the Company acquired its consolidated joint venture partners' interest in an industrial facility in Long Island City, New York for a payment of $8,918, which was recorded as a distribution to the partner in accordance with GAAP.

Benefit_Plans

Benefit Plans	12 Months Ended
	Dec. 31, 2014
Employee Benefits and Share-based Compensation [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 2014, 2013 and 2012. 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) vest 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) vest 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)		6.5				6.7			3.6
	Weighted-average expected volatility		49		%		59.08		%	59.94		%
	Weighted-average expected dividend yield		7.4		%		6.26		%	14.4		%
	The Company recognizes 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. The Company recognized $1,038, $1,037 and $1,197 in compensation expense in 2014, 2013 and 2012 respectively. The Company has unrecognized compensation costs of $480 relating to the outstanding options as of December 31, 2014. The intrinsic value of an option is the amount by which the market value of the underlying common share at the date the option is exercised exceeds the exercise price of the option. The total intrinsic value of options exercised for the years ended December 31, 2014, 2013 and 2012 were $2,780, $8,607 and $1,603, respectively.
	Share option activity during the years indicated is as follows:
		Number of			Weighted-Average
		Shares			Exercise Price
					Per Share
	Balance at December 31, 2011	3,888,281			$	6.36
	Exercised	(408,201	)		5.73
	Balance at December 31, 2012	3,480,080			6.44
	Exercised	(1,519,179	)		5.77
	Forfeited	(5,200	)		7.47
	Balance at December 31, 2013	1,955,701			6.95
	Exercised	(594,791	)		6.71
	Forfeited	(10,500	)		7.46
	Balance at December 31, 2014	1,350,410			$	7.05
	As of December 31, 2014, the aggregate intrinsic value of options that were outstanding and exercisable was $4,557.
	Non-vested share activity for the years ended December 31, 2014 and 2013, is as follows:
		Number of			Weighted-Average
		Shares			Value Per Share
	Balance at December 31, 2012	1,465,446			$	8.64
	Granted	1,829,400			10.52
	Vested	(770,229	)		7.14
	Forfeited	(3,571	)		9.21
	Balance at December 31, 2013	2,521,046			10.46
	Vested	(537,003	)		9.16
	Forfeited	(13,658	)		9.96
	Balance at December 31, 2014	1,970,385			$	10.82
	As of December 31, 2014, of the remaining 1,970,385 non-vested shares, 1,895,245 are subject to time-based vesting and 75,140 are subject to performance-based vesting. At December 31, 2014, there are 4,012,252 awards available for grant. The Company has $15,183 in unrecognized compensation costs relating to the non-vested shares that will be charged to compensation expense over an average of approximately 4.0 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, 2014 and 2013, 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 $299, $298 and $279 of contributions are applicable to 2014, 2013 and 2012, respectively.
	During 2014, 2013 and 2012, the Company recognized $7,550, $7,145 and $3,030, respectively, in expense relating to scheduled vesting and issuance of common share grants.

Related_Party_Transactions

Related Party Transactions	12 Months Ended
	Dec. 31, 2014
Related Party Transactions [Abstract]
Related Party Transactions	Related Party Transactions
	In addition to related party transactions discussed elsewhere in this Annual Report, the Company has an indemnity obligation to Vornado Realty Trust, 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 were approved by the independent members of the Company's Board of Trustees or the Audit Committee.
	The Company leases certain properties to entities in which Vornado Realty Trust, a significant shareholder, has an interest. During 2014, 2013 and 2012, the Company recognized $255, $744 and $842, respectively, in rental revenue, including discontinued operations, from these properties. The Company leases its corporate office from an affiliate of Vornado Realty Trust. Rent expense for this property was $1,252, $1,225 and $919 in 2014, 2013 and 2012, respectively.
	In 2012, the Company's Board of Trustees granted a waiver of the Company's Code of Business Conduct and Ethics to allow the Company to enter into a joint venture with an affiliate of its Chairman, which intended to raise capital from foreign investors seeking entry into the United States of America. No joint venture agreement was ever entered into by the Company with the affiliate of its Chairman. The Company is no longer pursuing any interest in the joint venture.

Income_Taxes

Income Taxes	12 Months Ended
	Dec. 31, 2014
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, 2014, 2013 and 2012 is summarized as follows:
		2014			2013			2012
	Current:
	Federal	$	145		$	(1,445	)	$	(371	)
	State and local	(1,130		)	(1,593		)	(1,082		)
	NOL utilized	—			586			401
	Deferred:
	Federal	(91		)	(595		)	141
	State and local	(33		)	(130		)	45
		$	(1,109	)	$	(3,177	)	$	(866	)
	Net deferred tax assets (liabilities) of $(19) and $106 are included in other assets (liabilities) on the accompanying Consolidated Balance Sheets at December 31, 2014 and 2013, respectively. These net deferred tax assets (liabilities) relate primarily to differences in the timing of the recognition of income (loss) between GAAP and tax.
	The income tax provision differs from the amount computed by applying the statutory federal income tax rate to pre-tax operating income as follows:
		2014			2013			2012
	Federal provision at statutory tax rate (34%)	$	(43	)	$	164		$	(573	)
	State and local taxes, net of federal benefit	(9		)	22			(110		)
	Other	(1,057		)	(3,363		)	(183		)
		$	(1,109	)	$	(3,177	)	$	(866	)
	For the years ended December 31, 2014, 2013 and 2012, the “other” amount is comprised primarily of state franchise taxes of $1,183, $1,280 and $968, respectively, the write-off of deferred tax liabilities (asset) of $0, $(150) and $0, respectively, and permanent differences of $0, $1,936, and $37, respectively, relating to the transfer of certain assets of the Company's taxable subsidiaries.
	As of December 31, 2014 and 2013, the Company had no net operating loss carry forwards for income taxes.
	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, 2014, is as follows:
		2014			2013			2012
	Total dividends per share	$	0.67		$	0.6		$	0.525
	Ordinary income	49.44		%	35.53		%	95.68		%
	Qualifying dividend	0.05		%	4.11		%	0.99		%
	Capital gain	—			2.09		%	—
	Return of capital	50.51		%	58.27		%	3.33		%
		100		%	100		%	100		%
	A summary of the average taxable nature of the Company's dividend on shares of its Series B Cumulative Redeemable Preferred Stock for each of the years in the three-year period ended December 31, 2014, is as follows:
		2014			2013			2012
	Total dividends per share	$	—		$	—		$	1.341667
	Ordinary income	—			—			98.98		%
	Qualifying dividend	—			—			1.02		%
	Capital gain	—			—			—
	Return of capital	—			—			—
		—			—			100		%
	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, 2014, is as follows:
		2014			2013			2012
	Total dividends per share	$	3.25		$	3.25		$	3.25
	Ordinary income	99.9		%	85.14		%	98.98		%
	Qualifying dividend	0.1		%	9.85		%	1.02		%
	Capital gain	—			5.01		%	—
	Return of capital	—			—			—
		100		%	100		%	100		%
	A summary of the average taxable nature of the Company's dividend on shares of its Series D Cumulative Redeemable Preferred Stock for the years in the three-year period ended December 31, 2014, is as follows:
		2014			2013			2012
	Total dividends per share	$	—		$	1.043368		$	1.8875
	Ordinary income	—			85.14		%	98.98		%
	Qualifying dividend	—			9.85		%	1.02		%
	Capital gain	—			5.01		%	—
	Return of capital	—			—			—
		—			100		%	100		%

Commitments_and_Contingencies

Commitments and Contingencies	12 Months Ended
	Dec. 31, 2014
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments and Contingencies
	In addition to the commitments and contingencies disclosed elsewhere, the Company has the following commitments and contingencies.
	The Company is obligated under certain tenant leases, including its proportionate share for leases for non-consolidated entities, to fund the expansion of the underlying leased properties. During 2014, the Company commenced the expansion of the Byhalia, Mississippi property for an estimated cost of $15,300. 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. As of December 31, 2014, the Company had two outstanding guarantees for (1) the completion of the base building improvements and the payment of a related tenant improvement allowance for an office property in Orlando, Florida, which the unfunded amounts were estimated to be $1,384 and (2) the full payment of the base building improvement, tenant improvement allowance and lease commissions for an office property in Herndon, Virginia, which the unfunded amounts were estimated to be $417.
	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.
	Other. Four of our executive officers have employment contracts and are 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.

Supplemental_Disclosure_of_Sta

Supplemental Disclosure of Statement of Cash Flow Information	12 Months Ended
	Dec. 31, 2014
Supplemental Cash Flow Information [Abstract]
Supplemental Disclosure of Statement of Cash Flow Information	Supplemental Disclosure of Statement of Cash Flow Information
	In addition to disclosures discussed elsewhere, during 2014, 2013 and 2012, the Company paid $100,080, $92,788 and $101,262, respectively, for interest and $859, $4,666 and $1,018, respectively, for income taxes.
	During 2014, the Company sold its interests in certain properties, which included the assumption of the related non-recourse mortgage debt in the aggregate amount of $30,140. In addition, the Company conveyed its interest in one property to its lender in full satisfaction of the $9,900 non-recourse mortgage note payable.
	During 2013, the Company sold its interests in two properties, which included the assumption of the related non-recourse mortgage debt of $40,356. In addition, the Company conveyed its interests in four properties to lenders in full satisfaction of the aggregate $49,510 non-recourse mortgage notes payable.
	During 2012, the Company sold its interest in a property, which included the assumption of the related non-recourse mortgage debt of $8,921. In addition, the Company conveyed its interests in two properties to lenders in full satisfaction of the aggregate $12,409 non-recourse mortgage notes payable.

Unaudited_Quarterly_Financial_

Unaudited Quarterly Financial Data	12 Months Ended
	Dec. 31, 2014
Quarterly Financial Information Disclosure [Abstract]
Unaudited Quarterly Financial Data	Unaudited Quarterly Financial Data
		2014
		3/31/14			6/30/14			9/30/14		12/31/14
	Total gross revenues(1)	$	104,139		$	105,571		$	106,708	$	107,954
	Net income	$	1,814		$	15,287		$	42,177	$	38,185
	Net income (loss) attributable to common shareholders	$	(839	)	$	12,743		$	38,720	$	35,700
	Net income (loss) attributable to common shareholders - basic per share	$	—		$	0.05		$	0.17	$	0.15
	Net income (loss) attributable to common shareholders - diluted per share	$	—		$	0.05		$	0.17	$	0.15
		2013
		3/31/13			6/30/13			9/30/13		12/31/13
	Total gross revenues(1)	$	85,159		$	88,398		$	87,895	$	100,458
	Net income (loss)	$	(2,123	)	$	7,832		$	5,155	$	(7,001	)
	Net income (loss) attributable to common shareholders	$	(7,295	)	$	(849	)	$	2,978	$	(8,923	)
	Net income (loss) attributable to common shareholders - basic per share	$	(0.04	)	$	—		$	0.01	$	(0.04	)
	Net income (loss) attributable to common shareholders - diluted per share	$	(0.04	)	$	—		$	0.01	$	(0.04	)
	_____________
	(1) All periods have been adjusted to reflect the impact of properties sold during the years ended December 31, 2014 and 2013, and properties classified as held for sale, which are reflected in discontinued operations in the Consolidated Statements of Operations.
	The sum of the quarterly income (loss) attributable to common shareholders and per common share amounts may not equal the full year amounts primarily because the computations of amounts allocated to participating securities and the weighted-average number of common shares of the Company outstanding for each quarter and the full year are made independently.

Subsequent_Events

Subsequent Events	12 Months Ended
	Dec. 31, 2014
Subsequent Events [Abstract]
Subsequent Events	Subsequent Events
	Subsequent to December 31, 2014 and in addition to disclosures elsewhere in the financial statements, the Company:
	•	acquired a 360 acre golf course in Venice, Florida for $16,850. The property is net leased for a 40-year term;
	•	entered into a forward commitment to acquire a build-to-suit industrial property in Detroit, Michigan for $29,680. The property will be subject to a 20-year net lease; and
	•	obtained a 10-year, 4.1% interest-only $29,193 non-recourse mortgage secured by a land parcel owned in New York, New York.

Schedule_III_Real_Estate_and_A

Schedule III - Real Estate and Accumulated Depreciation and Amortization	12 Months Ended
	Dec. 31, 2014
SEC Schedule III, Real Estate and Accumulated Depreciation Disclosure [Abstract]
Real Estate and Accumulated Depreciation Disclosure
	Description	Location		Encumbrances			Land and Land Estates		Buildings and Improvements			Total		Accumulated Depreciation and Amortization		Date Acquired	Date Constructed	Useful life computing depreciation in latest income statement (years)
	Long Term Lease - Industrial	Anniston, AL		$	—		$	1,201	$	16,771		$	17,972	$	—	14-Dec	2014	8, 15 & 24
	Long Term Lease - Office	Phoenix, AZ		—			5,585		36,099			41,684		2,167		12-Dec	1986/2011	10, 17, & 40
	Long Term Lease - Office	Tempe, AZ		7,344			—		9,442			9,442		2,597		5-Dec	1998	30 & 40
	Long Term Lease - Office	Los Angeles, CA		9,843			5,110		12,158			17,268		6,493		4-Dec	2000	10, 13 & 40
	Long Term Lease - Office	Englewood, CO		—			2,207		27,851			30,058		1,818		13-Apr	2013	15, 19 & 40
	Long Term Lease - Office	Louisville, CO		—			3,657		9,605			13,262		2,574		8-Sep	1987/2007	8, 9 & 40
	Long Term Lease - Office	Parachute, CO		—			1,400		10,751			12,151		278		14-Jan	2012	19, 24 & 40
	Long Term Lease - Office	Orlando, FL		—			11,498		66,996			78,494		38,974		6-Dec	1984/2012	3, 5, 10, 11, 13, 25 & 40
	Long Term Lease - Office	Tampa, FL		—			895		5,496			6,391		168		13-Dec	1999	20 & 38
	Long Term Lease - Office	Tampa, FL		—			146		559			705		19		13-Dec	1999	20 & 35
	Long Term Lease - Office	Tampa, FL		—			398		1,571			1,969		45		13-Dec	2014	14, 20 & 40
	Long Term Lease - Retail	Albany, GA		—			1,468		5,137			6,605		185		13-Oct	2013	15 & 40
	Long Term Lease - Office	McDonough, GA		11,466			1,443		11,234			12,677		1,046		12-Sep	1999	3, 11 & 38
	Long Term Lease - Industrial	Rantoul, IL		—			1,304		32,562			33,866		895		14-Jan	2013	20, 21 & 40
	Long Term Lease - Office	Lenexa, KS		38,296			6,909		41,693			48,602		9,602		8-Jul	2007	5, 12, 14, 15 & 40
	Long Term Lease - Industrial	Dry Ridge, KY	-1	2,351			560		12,553			13,113		4,144		5-Jun	1988/1992	22 & 40
	Long Term Lease - Industrial	Elizabethtown, KY	-2	11,986			890		26,868			27,758		8,870		5-Jun	1995/2001	25 & 40
	Long Term Lease - Industrial	Elizabethtown, KY	-2	2,252			352		4,862			5,214		1,605		5-Jun	2001	25 & 40
	Long Term Lease - Industrial	Hopkinsville, KY		7,003			631		16,154			16,785		5,624		5-Jun	Various	25 & 40
	Long Term Lease - Industrial	Owensboro, KY	-1	1,959			393		11,956			12,349		4,488		5-Jun	1998/2000	25 & 40
	Long Term Lease - Industrial	Shreveport, LA		19,000			860		21,840			22,700		4,254		7-Mar	2006	40
	Long Term Lease - Industrial	Minneapolis, MN		—			1,886		1,922			3,808		144		12-Sep	2003	3, 29 & 40
	Long Term Lease - Office	St Joseph, MO		—			607		14,004			14,611		1,030		12-Sep	2012	15 & 40
	Long Term Lease - Industrial	Byhalia, MS		15,000			1,006		21,483			22,489		1,969		11-May	2011	40
	Long Term Lease - Industrial	Shelby, NC		—			1,421		18,862			20,283		2,473		11-Jun	2011	11, 20 & 40
	Long Term Lease - Office	Omaha, NE		—			2,058		32,343			34,401		964		13-Dec	2013	20 & 40
	Long Term Lease - Office	Omaha, NE		7,776			2,566		8,324			10,890		2,310		5-Nov	1995	30 & 40
	Long Term Lease - Industrial	Durham, NH		—			3,464		18,094			21,558		4,759		7-Jun	1986/2003	40
	Long Term Lease - Office	Rockaway, NJ		—			4,646		20,467			25,113		5,143		6-Dec	2002/2004	20 & 40
	Long Term Lease - Specialty	Vineland, NJ		—			2,698		12,790			15,488		101		14-Oct	2003	3, 28 & 40
	Long Term Lease - Office	Las Vegas, NV		—			12,099		53,164			65,263		10,870		6-Dec	1983/1994	40
	Long Term Lease - Industrial	North Las Vegas, NV		—			3,244		21,732			24,976		421		13-Jul	2014	19, 20 & 40
	Long Term Lease - Industrial	Long Island City, NY		—			—		42,624			42,624		5,200		13-Mar	2013	15
	Long Term Lease - Land	New York, NY	-3	213,475			73,148		—			73,148		—		13-Oct	N/A	N/A
	Long Term Lease - Land	New York, NY	-3	—			86,569		—			86,569		—		13-Oct	N/A	N/A
	Long Term Lease - Land	New York, NY	-3	—			65,218		—			65,218		—		13-Oct	N/A	N/A
	Long Term Lease - Land	New York, NY		—			22,000		—			22,000		—		14-Oct	N/A	N/A
	Long Term Lease - Industrial	Chillicothe, OH		—			735		9,021			9,756		1,442		11-Oct	1995/1998	6, 15 & 26
	Long Term Lease - Industrial	Cincinnati, OH		—			1,049		8,784			9,833		1,835		6-Dec	1991	10, 14 & 40
	Long Term Lease - Office	Columbus, OH		—			1,594		10,481			12,075		1,048		10-Dec	2005	40
	Long Term Lease - Office	Columbus, OH		—			432		2,773			3,205		243		11-Jul	1999/2006	40
	Long Term Lease - Industrial	Glenwillow, OH		15,583			2,228		24,530			26,758		5,340		6-Dec	1996	40
	Long Term Lease - Office	Eugene, OR		—			1,541		13,098			14,639		916		12-Dec	2012	7, 12, 15, 25 & 40
	Long Term Lease - Industrial	Bristol, PA		—			2,508		15,863			18,371		5,461		Mar-98	1982/1997	10, 16, 30 & 40
	Description	Location		Encumbrances			Land and Land Estates		Buildings and Improvements			Total		Accumulated Depreciation and Amortization		Date Acquired	Date Constructed	Useful life computing depreciation in latest income statement (years)
	Long Term Lease - Office	Jessup, PA		—			2,520		17,678			20,198		1,691		12-Aug	2012	13, 15 & 40
	Long Term Lease - Industrial	Chester, SC		9,387			1,629		8,470			10,099		722		12-Sep	2001/2005	9, 13 & 34
	Long Term Lease - Office	Rock Hill, SC		—			1,601		18,989			20,590		464		14-Mar	2013	18, 20 & 40
	Long Term Lease - Industrial	Crossville, TN		—			545		6,999			7,544		3,159		6-Jan	1989/2006	17 & 40
	Long Term Lease - Industrial	Lewisburg, TN		—			173		10,865			11,038		226		14-May	2014	12, 18 & 34
	Long Term Lease - Office	Allen, TX		—			5,591		25,421			31,012		5,441		11-May	1981/1983	6, 7, 11 & 25
	Long Term Lease - Office	Arlington, TX		—			1,274		15,309			16,583		1,452		12-Sep	2003	1, 10, 12 & 40
	Long Term Lease - Office	Carrollton, TX		18,850			2,599		22,050			24,649		7,099		7-Jun	2003	8 & 40
	Long Term Lease - Office	Carrollton, TX		—			828		—			828		—		7-Jun	N/A	N/A
	Long Term Lease - Land/Infrastructure	Houston, TX		—			15,055		57,949			73,004		3,157		13-Mar	Various	11, 12, 16 & 35
	Long Term Lease - Office	Houston, TX		—			481		2,352			2,833		97		13-Dec	2002	11, 20 & 31
	Long Term Lease - Office	Houston, TX		—			1,875		10,959			12,834		6,148		5-Apr	2000	4, 13, 20 & 40
	Long Term Lease - Office	Houston, TX		23,206			16,613		58,226			74,839		14,158		4-Mar	1976/1984	10 & 40
	Long Term Lease - Land/Infrastructure	Missouri City, TX		—			14,555		5,895			20,450		2,246		12-Apr	N/A	7
	Long Term Lease - Specialty	Tomball, TX		8,759			3,174		7,405			10,579		655		12-Sep	2005	13, 14 & 40
	Long Term Lease - Land	Danville, VA		—			3,454		—			3,454		—		13-Oct	N/A	N/A
	Long Term Lease - Retail	Edmonds, WA		—			—		3,947			3,947		947		6-Dec	1981	40
Long Term Lease - Industrial	Eau Claire, WI		—			421		5,590			6,011		556		12-Sep	1993/2004	10, 15 & 28
Long Term Lease - Office	Huntington, WV		6,500			1,368		9,527			10,895		946		12-Jan	2011	14 & 40
Office	Little Rock, AR		—			1,353		2,260			3,613		490		6-Dec	1980	40
Office	Pine Bluff, AR		—			271		603			874		162		12-Sep	1964/1972/ 1988	3, 4 & 13
Office	Glendale, AZ		—			9,418		8,260			17,678		1,532		12-Sep	1986/1997/ 2000	7, 20 & 24
Office	Phoenix, AZ		—			4,666		24,856			29,522		8,495		May-00	1997	6, 9 & 40
Office	Tempe, AZ		—			—		12,461			12,461		1,015		12-Sep	1998	5, 10, 11, 15 & 36
Office	Tucson, AZ		—			681		4,037			4,718		406		12-Sep	1988	7, 10 & 30
Office	Lake Forest, CA		—			3,442		13,769			17,211		4,403		2-Mar	2001	40
Office	Palo Alto, CA		53,536			12,398		16,977			29,375		18,175		6-Dec	1973/1982	40
Office	Centennial, CO		—			4,851		15,187			20,038		5,289		7-May	2001	10 & 40
Office	Lakewood, CO		—			1,569		8,857			10,426		5,496		5-Apr	2002	2, 3, 12 & 40
Office	Wallingford, CT		—			1,049		4,773			5,822		1,472		3-Dec	1977/1993	8 & 40
Office	Boca Raton, FL		19,870			4,290		17,160			21,450		5,095		3-Feb	1983/2002	40
Office	Fort Meyers, FL		—			795		2,941			3,736		671		5-Apr	1998	5, 10 & 32
Office	Lake Mary, FL		—			4,535		14,830			19,365		4,809		7-Jun	1996	4, 7 & 40
Office	Lake Mary, FL		—			4,438		15,103			19,541		4,799		7-Jun	1999	4, 7 & 40
Office	Orlando, FL		9,602			3,538		9,708			13,246		4,681		7-Jan	2003	5, 6, 12, 15 & 40
Office	Orlando, FL		—			586		35,012			35,598		7,267		6-Dec	1982	40
Office	Palm Beach Gardens, FL		—			787		3,704			4,491		1,282		May-98	1996	May-40
Office	Tampa, FL		—			2,018		7,950			9,968		924		12-Sep	1986	8 & 27
Office	McDonough, GA		—			693		6,405			7,098		601		12-Sep	2007	6, 11 & 40
Office	Clive, IA		—			1,158		—			1,158		—		4-Jun	N/A	N/A
Office	Meridian, ID		9,746			2,255		7,797			10,052		937		12-Sep	2004	7 & 37
Office	Lisle, IL		9,613			3,236		13,747			16,983		3,636		6-Dec	1984	2, 3, 5, 20 & 40
Office	Schaumburg, IL		—			5,007		22,086			27,093		1,787		13-Oct	1979/1989/ 2010	7, 9 & 30
Office	Columbus, IN		25,129			235		45,729			45,964		10,947		6-Dec	1980/2006	40
Office	Fishers, IN		—			2,808		19,373			22,181		5,337		7-Jun	1999	Mar-40
Office	Indianapolis, IN		—			1,700		18,461			20,161		12,590		5-Apr	1999	Jun-40
Office	Lenexa, KS		9,854			2,828		6,075			8,903		673		12-Sep	2004	7, 12 & 37
Office	Overland Park, KS		34,733			4,769		41,956			46,725		11,583		7-Jun	1980/2005	12 & 40
Office	Baton Rouge, LA		—			1,252		11,085			12,337		3,341		7-May	1997	3, 4, 6 & 40
Office	Boston, MA		12,540			3,814		16,040			19,854		3,157		7-Mar	1910	10 & 40
Office	Foxboro, MA		—			2,231		25,653			27,884		13,053		4-Dec	1982/1987	16 & 40
Office	Oakland, ME		9,061			551		8,774			9,325		841		12-Sep	2005	8, 12 & 40
Description	Location		Encumbrances			Land and Land Estates		Buildings and Improvements			Total		Accumulated Depreciation and Amortization		Date Acquired	Date Constructed	Useful life computing depreciation in latest income statement (years)
Office	Livonia, MI		—			935		13,714			14,649		1,681		12-Sep	1987/1988/ 1990	Feb-34
Office	Southfield, MI		—			—		12,124			12,124		7,223		4-Jul	1966/1989	7, 16 & 40
Office	Kansas City, MO		16,559			2,433		20,154			22,587		5,546		7-Jun	1963/2003	12 & 40
Office	Pascagoula, MS		—			618		3,677			4,295		447		12-Sep	1995	1, 9 & 31
Office	Wall, NJ		19,870			8,985		26,961			35,946		11,518		4-Jan	1983	22 & 40
Office	Whippany, NJ		14,153			4,063		19,711			23,774		6,586		6-Nov	2006/2008	20 & 40
Office	Milford, OH		—			3,124		16,140			19,264		5,277		7-Jun	1991	May-40
Office	Westerville, OH		—			2,085		9,341			11,426		2,535		7-May	2000	5 & 40
Office	Redmond, OR		—			2,064		8,316			10,380		837		12-Sep	2004	6, 13 & 40
Office	Harrisburg, PA		7,857			900		10,693			11,593		7,802		5-Apr	1998	2, 9, 15, 20 & 40
Office	Philadelphia, PA		—			13,209		56,037			69,246		29,667		5-Jun	1957/1997	Apr-40
Office	Charleston, SC		7,277			1,189		8,724			9,913		3,087		6-Nov	2006	40
Office	Florence, SC		—			774		3,629			4,403		307		12-Feb	2012	12 & 40
Office	Fort Mill, SC		—			1,798		26,038			27,836		13,912		4-Nov	2004	11, 15 & 40
Office	Fort Mill, SC		—			3,601		15,340			18,941		4,513		2-Dec	2002	5, 11, 20 & 40
Office	Rock Hill, SC		—			551		4,313			4,864		395		11-May	2006	40
Office	Kingsport, TN		—			513		403			916		108		12-Sep	1981	5, 6 & 14
Office	Knoxville, TN		—			621		6,282			6,903		668		12-Sep	2002	1, 5, 7 & 40
Office	Knoxville, TN		—			1,079		11,146			12,225		5,630		5-Mar	1997	10, 11, 14 & 40
Office	Memphis, TN		3,617			464		4,467			4,931		1,497		6-Nov	1871/1999	20 & 40
Office	Memphis, TN		—			5,291		97,032			102,323		20,215		6-Dec	1985/2007	13 & 40
Office	Carrollton, TX		—			1,789		18,157			19,946		7,861		4-Jun	2003	19 & 40
Office	Farmers Branch, TX		18,408			3,984		27,308			31,292		9,006		7-Jun	2000	40
Office	Garland, TX		—			2,218		8,473			10,691		3,060		12-Sep	1980	4, 5 & 18
Office	Houston, TX		—			1,875		10,585			12,460		6,110		5-Apr	2000	5, 13 & 40
Office	Houston, TX		—			800		26,962			27,762		16,694		5-Apr	2000	10, 11, 20 & 40
Office	Irving, TX		—			7,476		45,985			53,461		15,558		7-May	2003	Jun-40
Office	Irving, TX		—			4,889		29,738			34,627		9,497		7-Jun	1999	10, 12 & 40
Office	Mission, TX		5,432			2,556		2,911			5,467		468		12-Sep	2003	3, 8 & 35
Office	San Antonio, TX		—			2,800		15,585			18,385		10,399		5-Apr	2000	6, 11 & 40
Office	Temple, TX		7,865			227		8,181			8,408		1,022		12-Sep	2001	3, 10, 12 & 40
Office	Westlake, TX		—			2,361		23,382			25,743		8,322		7-May	2001	Apr-40
Office	Hampton, VA		—			2,333		11,026			13,359		4,161		Mar-00	1999	5, 10, 15 & 40
Office	Herndon, VA		—			5,127		24,640			29,767		8,517		Dec-99	1987	Sep-40
Office	Herndon, VA		—			9,409		12,853			22,262		4,542		7-Jun	1985/1999	40
Office	Midlothian, VA		—			1,100		12,685			13,785		6,312		5-Apr	2000	6, 7, 15 & 40
Office	Bremerton, WA		5,854			1,655		5,445			7,100		642		12-Sep	2002	4, 13 & 40
Industrial	Moody, AL		—			654		9,943			10,597		5,683		4-Feb	2004	15 & 40
Industrial	Jacksonville, FL		—			573		1,592			2,165		451		12-Sep	1959/1967	Jan-40
Industrial	Orlando, FL		—			1,030		10,869			11,899		2,452		6-Dec	1980	40
Industrial	Tampa, FL		—			2,160		7,347			9,507		5,664		Jul-88	1986	Sep-40
Industrial	Lavonia, GA		7,959			171		7,657			7,828		505		12-Sep	2005	8, 12 & 40
Industrial	McDonough, GA		22,512			2,463		24,291			26,754		5,175		6-Dec	2000/2007	40
Industrial	Des Moines, IA		—			1,528		14,247			15,775		1,367		12-Sep	2000	5, 11 & 34
Industrial	Dubuque, IA		9,303			2,052		8,443			10,495		2,530		3-Jul	2001	11, 12 & 40
Industrial	Rockford, IL		—			371		2,573			2,944		604		6-Dec	1998	40
Industrial	Rockford, IL		—			509		5,289			5,798		1,160		6-Dec	1992	40
Industrial	Plymouth, IN		5,928			254		7,969			8,223		686		12-Sep	2000/2003	3, 6 & 34
Industrial	Owensboro, KY		—			819		2,439			3,258		782		6-Dec	1975/1995	40
Industrial	Shreveport, LA		—			1,078		10,134			11,212		932		12-Jun	2012	8,10 & 40
Industrial	North Berwick, ME		6,145			1,383		32,397			33,780		6,775		6-Dec	1965/1980	10 & 40
Industrial	Kalamazoo, MI		15,295			1,942		14,169			16,111		1,328		12-Sep	1999/2004	8, 9 & 40
Industrial	Marshall, MI		—			143		4,302			4,445		1,103		12-Sep	1968/1972/ 2008	4, 6 & 10
Industrial	Marshall, MI		—			40		2,236			2,276		700		Aug-87	1979	9, 10, 12, 15, 20 & 40
Description	Location		Encumbrances			Land and Land Estates		Buildings and Improvements			Total		Accumulated Depreciation and Amortization		Date Acquired	Date Constructed	Useful life computing depreciation in latest income statement (years)
Industrial	Plymouth, MI		—			2,296		13,608			15,904		4,641		7-Jun	1996/1998	30 & 40
Industrial	Temperance, MI		—			3,040		14,924			17,964		3,768		7-Jun	1978/1993	2, 5 & 40
Industrial	Olive Branch, MS		—			198		10,276			10,474		6,515		4-Dec	1989	8, 15 & 40
Industrial	Franklin, NC		67			296		1,320			1,616		151		12-Sep	1996	2, 8 & 29
Industrial	Henderson, NC		—			1,488		5,953			7,441		1,953		1-Nov	1998/2006	40
Industrial	High Point, NC		—			1,330		11,183			12,513		5,192		4-Jul	2002	18 & 40
Industrial	Lumberton, NC		—			405		12,049			12,454		3,101		6-Dec	1998/2006	40
Industrial	Statesville, NC		—			891		16,771			17,662		4,164		6-Dec	1999/2002	3, 15 & 40
Industrial	Erwin, NY		8,311			1,648		10,810			12,458		951		12-Sep	2006	4, 8 & 34
Industrial	Columbus, OH		—			1,990		10,580			12,570		2,783		6-Dec	1973	40
Industrial	Hebron, OH		—			1,063		4,271			5,334		1,393		Dec-97	1999	40
Industrial	Hebron, OH		—			1,681		7,224			8,905		2,641		1-Dec	2000	1, 2, 3, 5 & 40
Industrial	Streetsboro, OH		17,910			2,441		25,092			27,533		6,452		7-Jun	2004	12, 20, 25 & 40
Industrial	Duncan, SC		—			884		8,626			9,510		1,716		7-Jun	2005/2008	40
Industrial	Laurens, SC		—			5,552		21,177			26,729		5,438		7-Jun	1991/1993	2, 5 & 40
Industrial	Collierville, TN		—			714		4,783			5,497		1,588		5-Dec	2005/2012	9, 14, 21 & 40
Industrial	Franklin, TN		—			—		5,673			5,673		1,172		12-Sep	1970/1983	1, 4 & 12
Industrial	Memphis, TN		—			1,054		11,538			12,592		11,390		Feb-88	1987	8 &15
Industrial	Memphis, TN		—			1,553		12,326			13,879		3,033		6-Dec	1973	40
Industrial	Millington, TN		—			723		19,383			20,106		9,234		5-Apr	1997	9, 10, 16 & 40
Industrial	Waxahachie, TX		—			652		13,045			13,697		9,558		3-Dec	1996/2001	10, 16 & 40
Industrial	Winchester, VA		—			3,823		12,276			16,099		3,081		7-Jun	2001	4 & 40
Industrial	Bingen, WA		—			—		18,075			18,075		543		14-May	2014	10, 13 & 40
Multi-tenanted	Phoenix, AZ		—			1,831		14,892			16,723		2,715		1-Nov	1981/2009	May-40
Multi-tenanted	Palm Beach Gardens, FL		—			4,066		19,915			23,981		6,331		May-98	1996	May-40
Multi-tenanted	Honolulu, HI		—			8,259		7,363			15,622		1,529		6-Dec	1979/2002	2, 5 & 40
Multi-tenanted	Baltimore, MD		55,000			37,564		156,557			194,121		46,609		6-Dec	1973/2009	May-40
Multi-tenanted	Bridgeton, MO		—			603		1,142			1,745		—		6-Dec	1981	32
Multi-tenanted	Bridgewater, NJ		14,118			1,415		6,802			8,217		225		6-Dec	1985/2004	8, 15 & 40
Multi-tenanted	Rochester, NY		17,257			164		5,304			5,468		136		6-Dec	1988/2000	1, 8, 12, 15 & 33
Multi-tenanted	Canonsburg, PA		—			1,055		10,910			11,965		3,831		7-May	1996	8 & 40
Multi-tenanted	Florence, SC		—			3,235		13,081			16,316		4,203		4-May	1998	10, 20 & 40
Multi-tenanted	Antioch, TN		—			3,847		10,043			13,890		1,411		7-May	1999	May-40
Multi-tenanted	Arlington, TX		—			589		6,382			6,971		663		12-Sep	2003	1, 12 & 40
Multi-tenanted	Issaquah, WA	-4	30,388			3,052		5,210			8,262		—		7-Jun	1987	4, 7 & 32
Multi-tenanted	Issaquah, WA	-4	—			3,732		6,213			9,945		—		7-Jun	1992	7 & 32
Retail	Manteca, CA		846			2,082		6,464			8,546		1,499		7-May	1993	23 & 40
Retail	San Diego, CA		539			—		13,310			13,310		2,623		7-May	1993	23 & 40
Retail	Port Richey, FL		—			—		—			—		—		6-Dec	1980	—
Retail	Atlanta, GA		—			1,014		269			1,283		266		6-Dec	1972	40
Retail	Atlanta, GA		—			870		187			1,057		216		6-Dec	1975	40
Retail	Chamblee, GA		—			770		186			956		213		6-Dec	1972	40
Retail	Cumming, GA		—			1,558		1,368			2,926		593		6-Dec	1968/1982	40
Retail	Forest Park, GA		—			668		1,242			1,910		399		6-Dec	1969	40
Retail	Jonesboro, GA		—			778		146			924		190		6-Dec	1971	40
Retail	Stone Mountain, GA		—			672		276			948		196		6-Dec	1973	40
Retail	Galesburg, IL		475			560		2,366			2,926		640		7-May	1992	12 & 40
Retail	Lawrence, IN		—			404		1,737			2,141		356		6-Dec	1983	40
Retail	Jefferson, NC		—			71		884			955		204		6-Dec	1981	40
Retail	Lexington, NC		—			832		1,429			2,261		287		6-Dec	1981	40
Retail	Thomasville, NC		—			208		561			769		56		6-Dec	1993	40
Retail	Portchester, NY		—			3,841		5,246			9,087		553		6-Dec	1982	40
Retail	Watertown, NY		795			386		5,162			5,548		1,265		7-May	1993	23 & 40
Retail	Canton, OH		—			884		3,534			4,418		1,159		1-Nov	1995	40
Retail	Franklin, OH		—			722		999			1,721		100		6-Dec	1961/1978	40
Description	Location		Encumbrances			Land and Land Estates		Buildings and Improvements			Total		Accumulated Depreciation and Amortization		Date Acquired	Date Constructed	Useful life computing depreciation in latest income statement (years)
Retail	Lorain, OH		1,197			1,893		7,024			8,917		1,630		7-May	1993	23 & 40
Retail	Lawton, OK		—			663		1,288			1,951		392		6-Dec	1984	40
Retail	Oklahoma City, OK		—			1,782		912			2,694		313		12-Sep	1991/1996	5 & 13
Retail	Tulsa, OK		—			445		2,433			2,878		2,302		Dec-96	1981	14 & 24
Retail	Chattanooga, TN		—			487		956			1,443		94		6-Dec	1983/1995	40
Retail	Paris, TN		—			247		547			794		160		6-Dec	1982	40
Retail	Staunton, VA		—			1,028		326			1,354		89		6-Dec	1971	40
Retail	Fairlea, WV		559			501		1,985			2,486		436		7-May	1993/1999	12 & 40
Construction in progress			—			—		—			14,946		—		—	—	—
			$	945,216		$	755,168	$	2,901,446		$	3,671,560	$	795,486
-1	Properties are cross-collateralized.
-2	Properties are cross-collateralized.
-3	Properties are cross-collateralized.
-4	Properties are cross-collateralized.
(A) 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, 2014 for federal income tax purposes was approximately $4.4 billion.
	2014				2013			2012
Reconciliation of real estate, at cost:
Balance at the beginning of year	$	3,812,294			$	3,564,466		$	3,172,246
Additions during year	210,143				492,437			540,847
Properties sold during year	(282,143		)		(212,771		)	(138,041		)
Properties impaired during the year	(65,426		)		(31,741		)	(10,553		)
Other reclassifications	(3,308		)		(97		)	(33		)
Balance at end of year	$	3,671,560			$	3,812,294		$	3,564,466
Reconciliation of accumulated depreciation and amortization:
Balance at the beginning of year	$	775,617			$	738,068		$	638,368
Depreciation and amortization expense	119,156				122,057			119,067
Accumulated depreciation and amortization of properties sold and impaired during year	(98,698		)		(84,508		)	(19,367		)
Other reclassifications	(589		)		—			—
Balance at end of year	$	795,486			$	775,617		$	738,068

Summary_of_Significant_Account1

Summary of Significant Accounting Policies (Policies)	12 Months Ended
	Dec. 31, 2014
Accounting Policies [Abstract]
Basis of Presentation and Consolidation, Policy	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.
	If an investment is determined to be a VIE, the Company performs an analysis to determine if the Company is the primary beneficiary of the VIE. GAAP requires a VIE to be consolidated by its primary beneficiary. The primary beneficiary is the party that has a controlling financial interest in an entity. In order for a party to have a controlling financial interest in an entity, it must have (1) the power to direct the activities of a VIE that most significantly impact the entity's economic performance and (2) the obligation to absorb losses or the right to receive benefits of an entity that could potentially be significant to the VIE.
	At December 31, 2014 and 2013, the Company held variable interests in certain non-consolidated VIEs; however, the Company was not the primary beneficiary of these VIEs as the Company does not have a controlling financial interest in the entities. The Company has certain acquisition commitments and/ or acquisition, development and construction arrangements with VIEs. The Company is obligated to fund certain amounts as discussed in note 4.
Earnings Per Share, Policy	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, OP units and put options of certain convertible securities
Use of Estimates, Policy	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 current economic environment. The current economic environment has increased the degree of uncertainty inherent in these estimates and assumptions. 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 and the useful lives of long-lived assets. Actual results could differ materially from those estimates.
Fair Value Measurements, Policy	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, Policy	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 or deferred revenue 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.
Accounts Receivable, Policy	Accounts Receivable. The Company continuously monitors collections from tenants and makes a provision for estimated losses based upon historical experience and any specific tenant collection issues that the Company has identified. As of December 31, 2014 and 2013, the Company's allowance for doubtful accounts was not significant.
Purchase Accounting and Acquisition of Real Estate, Policy	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.
	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, Policy	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.
Investment in Non-Consolidated Entities, Policy	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, Policy	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, Policy	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, Policy	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, Policy	Properties Held For Sale. Assets and liabilities of properties that meet various held for sale criteria, including whether it is probable that a sale will occur within 12 months, are presented separately in the Consolidated Balance Sheets. The operating results of these properties are reflected as discontinued operations in the Consolidated Statements of Operations. 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, Policy	Deferred Expenses. Deferred expenses consist primarily of 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, Policy	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, Policy	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 vest 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, Policy	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, Policy	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, Policy	Restricted Cash. Restricted cash is comprised primarily of cash balances held in escrow with lenders.
Environmental Matters, Policy	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, 2014, 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, Policy	Segment Reporting. The Company operates generally in one industry segment, single-tenant real estate assets.
Reclassifications, Policy	Reclassifications. Certain amounts included in prior years' financial statements have been reclassified to conform to the current year presentation, including certain statement of operations captions including activities for properties sold during 2014, which are presented as discontinued operations.
New Accounting Pronouncements, Policy	Recently Issued Accounting Guidance. In April 2014, the FASB issued Accounting Standards Update No. 2014-08, Presentation of Financial Statements (Topic 205) and Property, Plant and Equipment (Topic 360): Reporting Discontinued Operations and Disclosures of Disposals of Components of an Entity, which changes the criteria for reporting discontinued operations and improves financial statement disclosures. Under this guidance, only disposals representing a strategic shift in operations that have a major effect on an organization's operations and financial results should be presented as discontinued operations. The new guidance is effective in the first quarter of 2015. It is anticipated that the implementation of this guidance will reduce the number of future property dispositions the Company makes, if any, that will be classified as discontinued operations in the Company's consolidated financial statements.
	In May 2014, the FASB issued Accounting Standards Update No. 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 new guidance is effective for reporting periods beginning after December 15, 2016. The Company is currently evaluating the impact of the adoption of the new guidance on its consolidated financial statements.
	In February 2015, the FASB issued Accounting Standards Update 2015-02, “Consolidation (Topic 810) - Amendments to the Consolidation Analysis,” which provides guidance on the consolidation evaluation for reporting organizations that are required to evaluate whether they should consolidate certain legal entities. In accordance with the guidance, all legal entities are subject to reevaluation under the revised consolidation model. The guidance is effective in the first quarter of 2016 and early adoption is allowed. The Company is currently evaluating the impact of the adoption of this new guidance on its consolidated financial statements.

Earnings_Per_Share_Tables

Earnings Per Share (Tables)	12 Months Ended
	Dec. 31, 2014
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, 2014:
		2014		2013			2012
	BASIC
	Income (loss) from continuing operations attributable to common shareholders	$	37,652	$	(38,506	)	$	157,974
	Income (loss) from discontinued operations attributable to common shareholders	48,672		24,417			(1,163		)
	Net income (loss) attributable to common shareholders	$	86,324	$	(14,089	)	$	156,811
	Weighted-average number of common shares outstanding	228,966,253		209,797,238			159,109,424
	Income (loss) per common share:
	Income (loss) from continuing operations	$	0.17	$	(0.18	)	$	0.99
	Income (loss) from discontinued operations	0.21		0.11			—
	Net income (loss) attributable to common shareholders	$	0.38	$	(0.07	)	$	0.99
		2014		2013			2012
	DILUTED:
	Income (loss) from continuing operations attributable to common shareholders	$	37,652	$	(38,506	)	$	157,974
	Impact of assumed conversions:
	Share Options	—		—			—
	Operating Partnership Units	—		—			1,490
	6.00% Convertible Guaranteed Notes	—		—			8,953
	Income (loss) from continuing operations attributable to common shareholders	37,652		(38,506		)	168,417
	Income (loss) from discontinued operations attributable to common shareholders	48,672		24,417			(1,163		)
	Impact of assumed conversions:
	Operating Partnership Units	—		—			(297		)
	Income (loss) from discontinued operations attributable to common shareholders	48,672		24,417			(1,460		)
	Net income (loss) attributable to common shareholders	$	86,324	$	(14,089	)	$	166,957
	Weighted-average common shares outstanding - basic	228,966,253		209,797,238			159,109,424
	Effect of dilutive securities:
	Share Options	470,455		—			306,449
	Operating Partnership Units	—		—			4,438,708
	6.00% Convertible Guaranteed Notes	—		—			15,805,245
	Weighted-average common shares outstanding	229,436,708		209,797,238			179,659,826
	Income (loss) per common share:
	Income (loss) from continuing operations	$	0.17	$	(0.18	)	$	0.94
	Income (loss) from discontinued operations	0.21		0.11			(0.01		)
	Net income (loss) attributable to common shareholders	$	0.38	$	(0.07	)	$	0.93

Investments_in_Real_Estate_and1

Investments in Real Estate and Real Estate Under Construction (Tables)	12 Months Ended
	Dec. 31, 2014
Real Estate Investments, Net [Abstract]
Schedule of Net Real Estate	The Company's real estate, net, consists of the following at December 31, 2014 and 2013:
			2014				2013
	Real estate, at cost:
	Buildings and building improvements		$	2,895,585			$	3,008,709
	Land, land estates and land improvements		755,168				793,418
	Fixtures and equipment		5,861				5,861
	Construction in progress		14,946				4,306
	Real estate intangibles:
	In-place lease values		473,377				486,743
	Tenant relationships		133,796				172,640
	Above-market leases		98,393				102,774
	Investments in real estate under construction		106,238				74,350
			4,483,364				4,648,801
	Accumulated depreciation and amortization(1)		(1,196,114		)		(1,223,381		)
	Real estate, net		$	3,287,250			$	3,425,420
	-1	Includes accumulated amortization of real estate intangible assets of $400,628 and $447,764 in 2014 and 2013, respectively. The estimated amortization of the above real estate intangible assets for the next five years is $35,894 in 2015, $30,221 in 2016, $26,905 in 2017, $23,179 in 2018 and $18,014 in 2019.
Schedule of Acquired Properties	The Company completed the following acquisitions and build-to-suit transactions during 2014 and 2013:
	2014:00:00
													Real Estate Intangible
	Property Type	Location	Acquisition/Completion Date	Initial Cost Basis			Lease Expiration	Land and Land Estate			Building and Improvements		Lease in-place Value
	Industrial	Rantoul, IL	Jan-14	$	41,277		Oct-33	$	1,304		$	32,562	$	7,411
	Office	Parachute, CO	Jan-14	$	13,928		Oct-32	$	1,400		$	10,751	$	1,777
	Office	Rock Hill, SC	Mar-14	$	24,715		Mar-34	$	1,601		$	18,989	$	4,125
	Industrial	Lewisburg, TN	May-14	$	13,320		Mar-26	$	173		$	10,865	$	2,282
	Industrial	North Las Vegas, NV	May-14	$	28,249		Sep-34	$	3,244		$	21,444	$	3,561
	Industrial	Bingen, WA	May-14	$	20,391		May-24	$	—		$	18,075	$	2,316
	Land	New York, NY	Oct-14	$	30,426		Oct-13	$	22,000		$	—	$	8,426
	Rehab Hospital	Vineland, NJ	Oct-14	$	19,100		Feb-43	$	2,698		$	12,790	$	3,612
	Industrial	Anniston, AL	Dec-14	$	20,907		Nov-29	$	1,201		$	16,771	$	2,935
				$	212,313			$	33,621		$	142,247	$	36,445
	Weighted-average life of intangible assets (years)												37.5
	2013:00:00
													Real Estate Intangibles
	Property Type	Location	Acquisition/Completion Date	Initial Cost Basis			Lease Expiration	Land and Land Estate			Building and Improvements		Above Market Lease Value		Lease in-place Value
	Industrial	Long Island City, NY	Feb-13	$	42,124		Mar-28	$	—		$	42,124	$	—	$	—
	Industrial	Houston, TX	Mar-13	$	81,400		Mar-38	$	15,055		$	57,949	$	—	$	8,396
	Office (1)	Denver, CO	Apr-13	$	34,547		Apr-28	$	2,207		$	26,724	$	—	$	5,616
	Retail(2)	Tuscaloosa, AL	May-13	$	8,397		May-28	$	2,793		$	5,604	$	—	$	—
	Land(3)	New York, NY	Oct-13	$	302,000		Oct-12	$	224,935		$	—	$	—	$	77,065
	Land	Danville, VA	Oct-13	$	4,727		Jan-29	$	3,454		$	—	$	673	$	600
	Retail(4)	Albany, GA	Nov-13	$	7,074		Nov-28	$	1,468		$	5,606	$	—	$	—
	Office(5)	Various	Dec-13	$	13,144		Dec-33	$	1,522		$	10,374	$	—	$	1,248
	Office	Omaha, NE	Dec-13	$	39,125		Nov-33	$	2,058		$	32,343	$	—	$	4,724
				$	532,538			$	253,492		$	180,724	$	673	$	97,649
	Weighted-average life of intangible assets (years)												15.3		82.5
	-1	The Company incurred additional tenant related costs of $3,825.
	-2	The Company incurred leasing costs of $323. The property was sold in September 2013.
	-3	Includes three properties.
	-4	The Company incurred leasing costs of $338.
	-5	Includes four properties. One property was under construction at December 31, 2013, $1,969 of construction in progress costs are included in building and improvements above.
Schedule of Development Arrangements Outstanding	As of December 31, 2014, the Company had the following development arrangements outstanding:
	Location	Property Type	Square Feet			Expected Maximum Commitment/Contribution				Lease Term (Years)	Estimated Completion Date
	Oak Creek, WI	Industrial	164,000			$	22,609			20	2Q 15
	Thomson, GA	Industrial	208,000			$	10,245			15	2Q 15
	Richmond, VA	Office	330,000			$	110,137			15	3Q 15
	Lake Jackson, TX	Office/R&D	664,000			$	166,164			20	4Q 16
			1,366,000			$	309,155

Sales_of_Real_Estate_and_Disco1

Sales of Real Estate and Discontinued Operations (Tables)	12 Months Ended
	Dec. 31, 2014
Discontinued Operations and Disposal Groups [Abstract]
Schedule of Disposal Groups, Including Discontinued Operations, Income Statement, Balance Sheet and Additional Disclosures	The following presents the operating results for the properties sold and held for sale during the years ended December 31, 2014, 2013 and 2012:
		Year Ending December 31,
		2014		2013		2012
	Total gross revenues	$	20,250	$	44,108	$	55,763
	Pre-tax net income, including gains on sales	$	49,680	$	26,701	$	702

Loans_Receivable_Tables

Loans Receivable (Tables)	12 Months Ended
	Dec. 31, 2014
Loans Receivable, Net [Abstract]
Schedule of Accounts, Notes, Loans and Financing Receivable	The following is a summary of our loans receivable as of December 31, 2014 and 2013:
			Loan carrying value(1)
	Loan		12/31/14		12/31/13		Interest Rate		Maturity Date
	Norwalk, CT(2)		$	—	$	28,186	7.5	%	Nov-14
	Homestead, FL(2)		—		10,239		7.5	%	Aug-14
	Westmont, IL(3)		12,152		12,610		6.45	%	Oct-15
	Southfield, MI(4)		3,296		6,610		4.55	%	Feb-15
	Austin, TX		2,800		2,389		16	%	Oct-18
	Kennewick, WA		85,254		37,030		9	%	May-22
	Other		2,133		2,379		8	%	2021-2022
			$	105,635	$	99,443
	-1	Loan carrying value includes accrued interest and is net of origination costs and loan losses.
	-2	Loan satisfied during 2014.
	-3	Borrowers are in default and the Company commenced foreclosure proceedings. Tenant at office property collateral terminated its lease. The Company recognized a loan loss of $13,939 during 2013. During 2014 and 2013, the Company recognized $1,284 and $1,737, respectively, of interest income relating to the impaired loan and the loan had an average recorded investment value of $12,812 and $25,562 during 2014 and 2013, respectively. At December 31, 2014, the impaired loan receivable had a contractual unpaid balance of $26,786.
	-4	The Company recorded a $2,500 loan loss in 2014 as the Company determined it was probable that it would not collect the amount owed at maturity. During 2014, the Company recognized $468 of interest income relating to the impaired loan and the loan had an average recorded investment of $6,001 during 2014. At December 31, 2014, the impaired loan receivable had a contractual unpaid balance of $5,810.

Fair_Value_Measurements_Tables

Fair Value Measurements (Tables)	12 Months Ended
	Dec. 31, 2014
Fair Value Disclosures [Abstract]
Schedule of Fair Value Measurement Inputs	The following tables present the Company's assets and liabilities from continuing operations measured at fair value on a recurring basis as of December 31, 2014 and 2013 and non-recurring basis during the year ended December 31, 2014 and 2013, aggregated by the level in the fair value hierarchy within which those measurements fall:
					Fair Value Measurements Using
	Description	2014			(Level 1)		(Level 2)			(Level 3)
	Interest rate swap assets	$	1,153		$	—	$	1,153		$	—
	Impaired real estate assets*	$	25,679		$	—	$	—		$	25,679
	Impaired loan receivable*	$	3,296		$	—	$	—		$	3,296
	Interest rate swap liabilities	$	(749	)	$	—	$	(749	)	$	—
	*Represents a non-recurring fair value measurement.
					Fair Value Measurements Using
	Description	2013			(Level 1)		(Level 2)			(Level 3)
	Interest rate swap assets	$	4,439		$	—	$	4,439		$	—
	Impaired real estate assets*	$	12,549		$	—	$	—		$	12,549
	Impaired loan receivable*	$	12,610		$	—	$	—		$	12,610
	Impaired investments in and advances to non-consolidated entities*	$	683		$	—	$	—		$	683
	*Represents a non-recurring fair value measurement.
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, 2014 and 2013:
		As of December 31, 2014					As of December 31, 2013
		Carrying			Fair Value		Carrying			Fair Value
		Amount					Amount
	Assets
	Loans Receivable (Level 3)	$	105,635		$	105,061	$	99,443		$	95,734
	Liabilities
	Debt (Level 3)	$	2,092,675		$	2,091,364	$	2,055,807		$	2,028,558

Mortgages_and_Notes_Payable_Ta

Mortgages and Notes Payable (Tables) (Mortgages and Notes Payable [Member])	12 Months Ended
	Dec. 31, 2014
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
	2015	$	170,440
	2016	154,337
	2017	93,469
	2018	292,297
	2019	358,835
	Thereafter	380,838
		$	1,450,216

Senior_Notes_Convertible_Notes1

Senior Notes, Convertible Notes, Exchangeable Notes and Trust Preferred Securities (Tables)	12 Months Ended
	Dec. 31, 2014
Debt Instrument [Line Items]
Debt Instrument Redemption	The Company had the following Senior Notes outstanding as of December 31, 2014:
	Issue Date		Face Amount				Interest Rate		Maturity Date		Issue Price
	May-14		$	250,000			4.4	%	Jun-24		99.883	%
	Jun-13		250,000				4.25	%	Jun-23		99.026	%
			$	500,000
Schedule of Long-term Debt Instruments	Below is a summary of additional disclosures related to the 6.00% Convertible Guaranteed Notes and the 5.45% Exchangeable Guaranteed Notes.
		6.00% Convertible Guaranteed Notes
	Balance Sheets:	December 31, 2014				December 31, 2013
	Principal amount of debt component	$	16,228			$	28,991
	Unamortized discount	(564		)		(1,500		)
	Carrying amount of debt component	$	15,664			$	27,491
	Carrying amount of equity component	$	(33,160	)		$	(26,032	)
	Effective interest rate	8.1		%		8.1		%
	Period through which discount is being amortized, put date	Jan-17				Jan-17
	Aggregate if-converted value in excess of aggregate principal amount	$	10,432			$	14,296
	Statements of Operations:		2014				2013			2012
	6.00% Convertible Guaranteed Notes
	Coupon interest		$	1,545			$	2,296		$	6,634
	Discount amortization		438				658			1,868
			$	1,983			$	2,954		$	8,502
	5.45% Exchangeable Guaranteed Notes
	Coupon interest		$	—			$	—		$	188
	Discount amortization		—				—			34
			$	—			$	—		$	222
Senior Notes, Convertible Notes, Exchangeable 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
	2015		$	—
	2016		—
	2017(1)		16,228
	2018		—
	2019		—
	Thereafter		629,120
			645,348
	Debt discounts		(2,889		)
			$	642,459
	-1	Although the 6.00% Convertible Guaranteed Notes mature in 2030, the notes can be put to the Company in 2017.

Derivatives_and_Hedging_Activi1

Derivatives and Hedging Activities (Tables)

12 Months Ended

Dec. 31, 2014

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Schedule of Derivative Instruments

As of December 31, 2014, 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, 2014 and 2013.

As of December 31, 2014

As of December 31, 2013

Balance Sheet Location

Fair Value

Balance Sheet Location

Fair Value

Derivatives designated as hedging instruments:

Interest Rate Swap Asset

Other Assets

$

1,153

Other Assets

$

4,439

Interest Rate Swap Liability

Accounts Payable and Other Liabilities

$

(749

)

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 2014 and 2013:

Derivatives in Cash Flow

Amount of Gain (Loss) Recognized

Location of Loss

Amount of Loss Reclassified

in OCI on Derivative

Reclassified from

from Accumulated OCI into

(Effective Portion)

Accumulated OCI into Income (Effective Portion)

Income (Effective Portion)

December 31,

December 31,

Hedging Relationships

2014

2013

2014

2013

Interest Rate Swap

$

(9,560

)

$

7,559

Interest expense

$

5,525

$

3,104

Leases_Tables

Leases (Tables)	12 Months Ended
	Dec. 31, 2014
Leases [Abstract]
Schedule of Future Minimum Rental Payments Receivable for Operating Leases	Minimum future rental receipts under the non-cancelable portion of tenant leases, assuming no new or re-negotiated leases, for the next five years and thereafter are as follows:
	Year ending	Total
	December 31,
	2015	$	341,950
	2016	327,046
	2017	300,418
	2018	275,572
	2019	248,604
	Thereafter	6,203,163
		$	7,696,753
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	Total
	December 31,
	2015	$	5,137
	2016	4,927
	2017	4,880
	2018	4,664
	2019	4,134
	Thereafter	37,963
		$	61,705

Equity_Tables

Equity (Tables)	12 Months Ended
	Dec. 31, 2014
Equity [Abstract]
Stock Redemptions and Retirements	During 2013 and 2012, the Company repurchased/redeemed and retired the following shares of its preferred stock:
			2013				2012
	8.05% Series B Cumulative Redeemable Preferred Stock:
	Shares redeemed and retired		—				2,740,874
	Redemption cost(1)		$	—			$	69,459
	Deemed dividend(2)		$	—			$	2,346
	6.50% Series C Cumulative Convertible Preferred Stock:
	Shares repurchased and retired		—				34,800
	Repurchase cost		$	—			$	1,462
	Discount (Deemed negative dividend)(2)		$	—			$	(229	)
	7.55% Series D Cumulative Redeemable Preferred Stock:
	Shares redeemed and retired		6,200,000				—
	Redemption cost(1)		$	155,621			$	—
	Deemed dividend(2)		$	5,230			$	—
	-1	Includes accrued and unpaid dividends.
	-2	Represents the difference between the redemption/repurchase cost and historical GAAP cost. Accordingly, net income (loss) was adjusted for the deemed dividends/deemed negative dividends to arrive at net income (loss) attributable to common shareholders.
Accumulated Other Comprehensive Income Loss	Changes in Accumulated Other Comprehensive Income
			Gains and Losses
			on Cash Flow Hedges
	Balance December 31, 2013		$	4,439
	Other comprehensive loss before reclassifications		(9,560		)
	Amounts of loss reclassified from accumulated other comprehensive loss to interest expense		5,525
	Balance December 31, 2014		$	404
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
		2014				2013				2012
	Net income attributable to Lexington Realty Trust shareholders	$	93,104			$	1,630			$	180,316
	Transfers from noncontrolling interests:
	Increase (decrease) in additional paid-in-capital for redemption of noncontrolling OP units	(858		)		1,053				1,343
	Change from net income attributable to shareholders and transfers from noncontrolling interests	$	92,246			$	2,683			$	181,659

Benefit_Plans_Tables

Benefit Plans (Tables)	12 Months Ended
	Dec. 31, 2014
Employee Benefits and Share-based Compensation [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)		6.5				6.7			3.6
	Weighted-average expected volatility		49		%		59.08		%	59.94		%
	Weighted-average expected dividend yield		7.4		%		6.26		%	14.4		%
Schedule of Share-based Compensation, Stock Options, Activity	Share option activity during the years indicated is as follows:
		Number of			Weighted-Average
		Shares			Exercise Price
					Per Share
	Balance at December 31, 2011	3,888,281			$	6.36
	Exercised	(408,201	)		5.73
	Balance at December 31, 2012	3,480,080			6.44
	Exercised	(1,519,179	)		5.77
	Forfeited	(5,200	)		7.47
	Balance at December 31, 2013	1,955,701			6.95
	Exercised	(594,791	)		6.71
	Forfeited	(10,500	)		7.46
	Balance at December 31, 2014	1,350,410			$	7.05
Schedule of Nonvested Share Activity	Non-vested share activity for the years ended December 31, 2014 and 2013, is as follows:
		Number of			Weighted-Average
		Shares			Value Per Share
	Balance at December 31, 2012	1,465,446			$	8.64
	Granted	1,829,400			10.52
	Vested	(770,229	)		7.14
	Forfeited	(3,571	)		9.21
	Balance at December 31, 2013	2,521,046			10.46
	Vested	(537,003	)		9.16
	Forfeited	(13,658	)		9.96
	Balance at December 31, 2014	1,970,385			$	10.82

Income_Taxes_Tables

Income Taxes (Tables)	12 Months Ended
	Dec. 31, 2014
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, 2014, 2013 and 2012 is summarized as follows:
		2014			2013			2012
	Current:
	Federal	$	145		$	(1,445	)	$	(371	)
	State and local	(1,130		)	(1,593		)	(1,082		)
	NOL utilized	—			586			401
	Deferred:
	Federal	(91		)	(595		)	141
	State and local	(33		)	(130		)	45
		$	(1,109	)	$	(3,177	)	$	(866	)
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:
		2014			2013			2012
	Federal provision at statutory tax rate (34%)	$	(43	)	$	164		$	(573	)
	State and local taxes, net of federal benefit	(9		)	22			(110		)
	Other	(1,057		)	(3,363		)	(183		)
		$	(1,109	)	$	(3,177	)	$	(866	)
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, 2014, is as follows:
		2014			2013			2012
	Total dividends per share	$	0.67		$	0.6		$	0.525
	Ordinary income	49.44		%	35.53		%	95.68		%
	Qualifying dividend	0.05		%	4.11		%	0.99		%
	Capital gain	—			2.09		%	—
	Return of capital	50.51		%	58.27		%	3.33		%
		100		%	100		%	100		%
	A summary of the average taxable nature of the Company's dividend on shares of its Series B Cumulative Redeemable Preferred Stock for each of the years in the three-year period ended December 31, 2014, is as follows:
		2014			2013			2012
	Total dividends per share	$	—		$	—		$	1.341667
	Ordinary income	—			—			98.98		%
	Qualifying dividend	—			—			1.02		%
	Capital gain	—			—			—
	Return of capital	—			—			—
		—			—			100		%
	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, 2014, is as follows:
		2014			2013			2012
	Total dividends per share	$	3.25		$	3.25		$	3.25
	Ordinary income	99.9		%	85.14		%	98.98		%
	Qualifying dividend	0.1		%	9.85		%	1.02		%
	Capital gain	—			5.01		%	—
	Return of capital	—			—			—
		100		%	100		%	100		%
	A summary of the average taxable nature of the Company's dividend on shares of its Series D Cumulative Redeemable Preferred Stock for the years in the three-year period ended December 31, 2014, is as follows:
		2014			2013			2012
	Total dividends per share	$	—		$	1.043368		$	1.8875
	Ordinary income	—			85.14		%	98.98		%
	Qualifying dividend	—			9.85		%	1.02		%
	Capital gain	—			5.01		%	—
	Return of capital	—			—			—
		—			100		%	100		%

Unaudited_Quarterly_Financial_1

Unaudited Quarterly Financial Data (Tables)	12 Months Ended
	Dec. 31, 2014
Quarterly Financial Information Disclosure [Abstract]
Schedule of Quarterly Financial Information
		2014
		3/31/14			6/30/14			9/30/14		12/31/14
	Total gross revenues(1)	$	104,139		$	105,571		$	106,708	$	107,954
	Net income	$	1,814		$	15,287		$	42,177	$	38,185
	Net income (loss) attributable to common shareholders	$	(839	)	$	12,743		$	38,720	$	35,700
	Net income (loss) attributable to common shareholders - basic per share	$	—		$	0.05		$	0.17	$	0.15
	Net income (loss) attributable to common shareholders - diluted per share	$	—		$	0.05		$	0.17	$	0.15
		2013
		3/31/13			6/30/13			9/30/13		12/31/13
	Total gross revenues(1)	$	85,159		$	88,398		$	87,895	$	100,458
	Net income (loss)	$	(2,123	)	$	7,832		$	5,155	$	(7,001	)
	Net income (loss) attributable to common shareholders	$	(7,295	)	$	(849	)	$	2,978	$	(8,923	)
	Net income (loss) attributable to common shareholders - basic per share	$	(0.04	)	$	—		$	0.01	$	(0.04	)
	Net income (loss) attributable to common shareholders - diluted per share	$	(0.04	)	$	—		$	0.01	$	(0.04	)
	_____________
	(1) All periods have been adjusted to reflect the impact of properties sold during the years ended December 31, 2014 and 2013, and properties classified as held for sale, which are reflected in discontinued operations in the Consolidated Statements of Operations.

The_Company_Details

The Company (Details)	Dec. 31, 2014
	state
	Property
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Number of consolidated properties	215
Number of states in which entity has interests	40

Summary_of_Significant_Account2

Summary of Significant Accounting Policies (Details)	12 Months Ended
	Dec. 31, 2014
Summary of Significant Accounting Policies [Line Items]
Vesting period	5 years
Expiration period of options	10 years
Building and Building Improvements [Member]
Summary of Significant Accounting Policies [Line Items]
Maximum useful life of PPE (in years)	40 years

Earnings_Per_Share_Details

Earnings Per Share (Details) (USD $)	3 Months Ended								12 Months Ended
In Thousands, except Share data, unless otherwise specified	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2010
BASIC
Income (loss) from continuing operations attributable to common shareholders									$37,652	($38,506)	$157,974
Income (loss) from discontinued operations attributable to common shareholders									48,672	24,417	-1,163
Net income (loss) attributable to common shareholders									86,324	-14,089	156,811
Weighted-average common shares outstanding b basic									228,966,253	209,797,238	159,109,424
Income (loss) from continuing operations, basic (usd per share)									$0.17	($0.18)	$0.99
Income (loss) from discontinued operations, basic (usd per share)									$0.21	$0.11	$0
Net income (loss) attributable to common shareholders, basic (usd per share)	$0.15	$0.17	$0.05	$0	($0.04)	$0.01	$0	($0.04)	$0.38	($0.07)	$0.99
Impact of assumed conversions:
Share Options									0	0	0
Operating Partnership Units									0	0	1,490
6.00% Convertible Guaranteed Notes									0	0	8,953
Income (loss) from continuing operations attributable to common shareholders									37,652	-38,506	168,417
Income (loss) from discontinued operations									48,672	24,417	-1,163
Operating Partnership Units									0	0	-297
Income (loss) from discontinued operations attributable to common shareholders									48,672	24,417	-1,460
Net income (loss) attributable to common shareholders									$86,324	($14,089)	$166,957
Weighted-average common shares outstanding - basic									228,966,253	209,797,238	159,109,424
Effect of dilutive securities:
Share Options									470,455	0	306,449
Operating Partnership Units									0	0	4,438,708
6.00% Convertible Guaranteed Notes									0	0	15,805,245
Weighted-average common shares outstanding									229,436,708	209,797,238	179,659,826
Income (loss) per common share:
Income (loss) from continuing operations, diluted (usd per share)									$0.17	($0.18)	$0.94
Income (loss) from discontinued operations, diluted (usd per share)									$0.21	$0.11	($0.01)
Net income (loss) attributable to common shareholders - diluted per share	$0.15	$0.17	$0.05	$0	($0.04)	$0.01	$0	($0.04)	$0.38	($0.07)	$0.93
6.00% Convertible Guaranteed Note [Member]
Impact of assumed conversions:
Debt interest rate percentage	6.00%				6.00%				6.00%	6.00%	6.00%	6.00%

Investments_in_Real_Estate_and2

Investments in Real Estate and Real Estate Under Construction - Schedule of Net Real Estate (Details) (USD $)	Dec. 31, 2014		Dec. 31, 2013
In Thousands, unless otherwise specified
Investments in Real Estate and Real Estate Under Construction [Line Items]
Buildings and building improvements	$2,895,585		$3,008,709
Land, land estates and land improvements	755,168		793,418
Fixtures and equipment	5,861		5,861
Construction in progress	14,946		4,306
Real estate - intangible assets	705,566		762,157
Investments in real estate under construction	106,238		74,350
Real estate, gross	4,483,364		4,648,801
Accumulated depreciation and amortization(1)	-1,196,114	[1]	-1,223,381	[1]
Real estate, net	3,287,250		3,425,420
Accumulated amortization	400,628		447,764
Amortization expense, next 12 months	35,894
Amortization expense, year 2	30,221
Amortization expense, year 3	26,905
Amortization expense, year 4	23,179
Amortization expense, year 5	18,014
Leases, Acquired-in-Place [Member]
Investments in Real Estate and Real Estate Under Construction [Line Items]
Real estate - intangible assets	473,377		486,743
Tenant Relationships [Member]
Investments in Real Estate and Real Estate Under Construction [Line Items]
Real estate - intangible assets	133,796		172,640
Above Market Leases [Member]
Investments in Real Estate and Real Estate Under Construction [Line Items]
Real estate - intangible assets	$98,393		$102,774
[1]	Includes accumulated amortization of real estate intangible assets of $400,628 and $447,764 in 2014 and 2013, respectively. The estimated amortization of the above real estate intangible assets for the next five years is $35,894 in 2015, $30,221 in 2016, $26,905 in 2017, $23,179 in 2018 and $18,014 in 2019.

Investments_in_Real_Estate_and3

Investments in Real Estate and Real Estate Under Construction - Additional Information (Details) (USD $)	12 Months Ended		0 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Sep. 01, 2012
	Property
Investments in Real Estate and Real Estate Under Construction [Line Items]
Below-market leases, net of accretion	$54,414	$59,781
Future accretion, year 1	4,383
Future accretion, year 2	3,312
Future accretion, year 3	2,918
Future accretion, year 4	2,911
Future accretion, year 5	2,603
Acquisition related costs	1,901	1,349
Investments in real estate under construction	106,238	74,350
Number of real estate properties	215
Net Lease Strategic Assets Fund L P [Member]
Investments in Real Estate and Real Estate Under Construction [Line Items]
Payments to acquire businesses, gross			9,438
Equity interest in acquiree, remeasurement gain			167,864
Development Deals [Member]
Investments in Real Estate and Real Estate Under Construction [Line Items]
Capitalized interest	$2,828	$1,472

Investments_in_Real_Estate_and4

Investments in Real Estate and Real Estate Under Construction - Schedule of Acquired Properties (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
	Property
Investments in Real Estate and Real Estate Under Construction [Line Items]
Initial Cost Basis	$212,313	$532,538
Land and Land Estate	33,621	253,492
Building and Improvements	142,247	180,724
Above Market Lease Value		673
Lease in-place Value	36,445	97,649
Number of real estate properties	215
Construction in progress	14,946	4,306
Above Market Leases [Member]
Investments in Real Estate and Real Estate Under Construction [Line Items]
Weighted-average life of intangible assets (years)		15 years 3 months 18 days
Leases, Acquired-in-Place [Member]
Investments in Real Estate and Real Estate Under Construction [Line Items]
Weighted-average life of intangible assets (years)	37 years 6 months	82 years 6 months
Industrial Property [Member] | Rantoul, Illinois [Member]
Investments in Real Estate and Real Estate Under Construction [Line Items]
Initial Cost Basis	41,277
Land and Land Estate	1,304
Building and Improvements	32,562
Lease in-place Value	7,411
Industrial Property [Member] | Lewisburg, Tennessee [Member]
Investments in Real Estate and Real Estate Under Construction [Line Items]
Initial Cost Basis	13,320
Land and Land Estate	173
Building and Improvements	10,865
Lease in-place Value	2,282
Industrial Property [Member] | North Las Vegas, Nevada [Member]
Investments in Real Estate and Real Estate Under Construction [Line Items]
Initial Cost Basis	28,249
Land and Land Estate	3,244
Building and Improvements	21,444
Lease in-place Value	3,561
Industrial Property [Member] | Bingen, Washington [Member]
Investments in Real Estate and Real Estate Under Construction [Line Items]
Initial Cost Basis	20,391
Land and Land Estate	0
Building and Improvements	18,075
Lease in-place Value	2,316
Industrial Property [Member] | Anniston, Alabama [Member]
Investments in Real Estate and Real Estate Under Construction [Line Items]
Initial Cost Basis	20,907
Land and Land Estate	1,201
Building and Improvements	16,771
Lease in-place Value	2,935
Industrial Property [Member] | Long Island City, New York [Member]
Investments in Real Estate and Real Estate Under Construction [Line Items]
Initial Cost Basis		42,124
Land and Land Estate		0
Building and Improvements		42,124
Above Market Lease Value		0
Lease in-place Value		0
Industrial Property [Member] | Houston, Texas [Member]
Investments in Real Estate and Real Estate Under Construction [Line Items]
Initial Cost Basis		81,400
Land and Land Estate		15,055
Building and Improvements		57,949
Above Market Lease Value		0
Lease in-place Value		8,396
Office Property [Member] | Parachute, Colorado [Member]
Investments in Real Estate and Real Estate Under Construction [Line Items]
Initial Cost Basis	13,928
Land and Land Estate	1,400
Building and Improvements	10,751
Lease in-place Value	1,777
Office Property [Member] | Rock Hill, South Carolina [Member]
Investments in Real Estate and Real Estate Under Construction [Line Items]
Initial Cost Basis	24,715
Land and Land Estate	1,601
Building and Improvements	18,989
Lease in-place Value	4,125
Office Property [Member] | Denver, Colorado [Member]
Investments in Real Estate and Real Estate Under Construction [Line Items]
Initial Cost Basis		34,547	[1]
Land and Land Estate		2,207	[1]
Building and Improvements		26,724	[1]
Above Market Lease Value		0	[1]
Lease in-place Value		5,616	[1]
Payments for tenant improvements		3,825
Office Property [Member] | Other Locations [Member]
Investments in Real Estate and Real Estate Under Construction [Line Items]
Initial Cost Basis		13,144	[2]
Land and Land Estate		1,522	[2]
Building and Improvements		10,374	[2]
Above Market Lease Value		0	[2]
Lease in-place Value		1,248	[2]
Construction in progress		1,969
Office Property [Member] | Omaha, Nebraska [Member]
Investments in Real Estate and Real Estate Under Construction [Line Items]
Initial Cost Basis		39,125
Land and Land Estate		2,058
Building and Improvements		32,343
Above Market Lease Value		0
Lease in-place Value		4,724
Retail Site [Member] | Tuscaloosa, Alabama [Member]
Investments in Real Estate and Real Estate Under Construction [Line Items]
Initial Cost Basis		8,397	[3]
Land and Land Estate		2,793	[3]
Building and Improvements		5,604	[3]
Above Market Lease Value		0	[3]
Lease in-place Value		0	[3]
Payments for leasing costs		323
Retail Site [Member] | Albany, Georgia [Member]
Investments in Real Estate and Real Estate Under Construction [Line Items]
Initial Cost Basis		7,074	[4]
Land and Land Estate		1,468	[4]
Building and Improvements		5,606	[4]
Above Market Lease Value		0	[4]
Lease in-place Value		0	[4]
Payments for leasing costs		338
Land [Member] | New York, New York [Member]
Investments in Real Estate and Real Estate Under Construction [Line Items]
Initial Cost Basis	30,426	302,000	[5]
Land and Land Estate	22,000	224,935	[5]
Building and Improvements	0	0	[5]
Above Market Lease Value		0	[5]
Lease in-place Value	8,426	77,065	[5]
Number of real estate properties	3
Land [Member] | Danville, Virginia [Member]
Investments in Real Estate and Real Estate Under Construction [Line Items]
Initial Cost Basis		4,727
Land and Land Estate		3,454
Building and Improvements		0
Above Market Lease Value		673
Lease in-place Value		600
Rehabilitation Hospital [Member] | Vineland, New Jersey [Member]
Investments in Real Estate and Real Estate Under Construction [Line Items]
Initial Cost Basis	19,100
Land and Land Estate	2,698
Building and Improvements	12,790
Lease in-place Value	$3,612
[1]	The Company incurred additional tenant related costs of $3,825.
[2]	Includes four properties. One property was under construction at DecemberB 31, 2013, $1,969 of construction in progress costs are included in building and improvements above.
[3]	The Company incurred leasing costs of $323. The property was sold in September 2013.
[4]	The Company incurred leasing costs of $338.
[5]	Includes three properties.

Investments_in_Real_Estate_and5

Investments in Real Estate and Real Estate Under Construction - Schedule of Development Arrangements Outstanding (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014
	sqft
Lender Subsidiary [Member]
Investments in Real Estate and Real Estate Under Construction [Line Items]
Area of real estate property	1,366,000
Expected Maximum Commitment/Contribution	$309,155
Industrial Property [Member] | Oak Creek Wisconsin [Member]
Investments in Real Estate and Real Estate Under Construction [Line Items]
Area of real estate property	164,000
Expected Maximum Commitment/Contribution	22,609
Lease Term (Years)	20 years
Industrial Property [Member] | Thomson, Georgia [Member]
Investments in Real Estate and Real Estate Under Construction [Line Items]
Area of real estate property	208,000
Expected Maximum Commitment/Contribution	10,245
Lease Term (Years)	15 years
Office Building [Member] | Richmond, Virginia [Member]
Investments in Real Estate and Real Estate Under Construction [Line Items]
Area of real estate property	330,000
Expected Maximum Commitment/Contribution	110,137
Lease Term (Years)	15 years
Office/R&D [Member] | Lake Jackson, Texas [Member]
Investments in Real Estate and Real Estate Under Construction [Line Items]
Area of real estate property	664,000
Expected Maximum Commitment/Contribution	$166,164
Lease Term (Years)	20 years

Sales_of_Real_Estate_and_Disco2

Sales of Real Estate and Discontinued Operations (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
	Property	Property
Discontinued Operations and Disposal Groups [Abstract]
Aggregate gross disposition price	$226,375	$75,519	$142,022
Aggregate gain on sale of properties	57,507	24,472	13,291
Debt satisfaction gains (charges), net	-312	8,905	-206
Properties classified as held-for-sale (in number of properties)	1	0
Total gross revenues	20,250	44,108	55,763
Pre-tax net income, including gains on sales	$49,680	$26,701	$702

Impairment_of_Real_Estate_Deta

Impairment of Real Estate (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Continuing Operations [Member]
Impairment of Real Estate
Impairment charges on real estate	$34,833	$21,640	$4,262
Carrying value of impaired asset	37,750
Discontinued Operations [Member]
Impairment of Real Estate
Impairment charges on real estate	13,767	12,920	5,707
Mortgages [Member] | Continuing Operations [Member]
Impairment of Real Estate
Non-recourse debt	$61,763

Loans_Receivable_Details

Loans Receivable (Details) (USD $)	12 Months Ended					1 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012	Dec. 31, 2014
	portfolio_segment
	type_of_financing
	class_of_financing
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan carrying-value	$105,635	[1]	$99,443	[1]		$105,635	[1]
Loans receivable, net	105,635		99,443			105,635
Number of types of financing receivable	2
Number of portfolio segments	1
Net proceeds from sale of properties	237,866		75,519		155,240
Number of classes of financing receivable	1
Norwalk, Connecticut [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan carrying-value	0	[1],[2]	28,186	[1],[2]		0	[1],[2]
Interest Rate	7.50%	[2]	7.50%	[2]
Homestead, Florida [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan carrying-value	0	[1],[2]	10,239	[1],[2]		0	[1],[2]
Interest Rate	7.50%	[2]	7.50%	[2]
Westmont, Illinios [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan carrying-value	12,152	[1],[3]	12,610	[1],[3]		12,152	[1],[3]
Interest Rate	6.45%	[3]	6.45%	[3]
Loan losses			13,939
Impaired interest income	1,284		1,737
Average recorded investment	12,812		25,562
Unpaid principal balance	26,786					26,786
Southfield, Michigan [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan carrying-value	3,296	[1],[4]	6,610	[1],[4]		3,296	[1],[4]
Interest Rate	4.55%	[4]	4.55%	[4]
Loan losses	2,500
Impaired interest income	468
Average recorded investment	6,001
Unpaid principal balance	5,810					5,810
Austin, Texas [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan carrying-value	2,800	[1]	2,389	[1]		2,800	[1]
Interest Rate	16.00%		16.00%
Kennewick, Washington [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan carrying-value	85,254	[1]	37,030	[1]		85,254	[1]
Interest Rate	9.00%		9.00%
Other Loan Locations [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan carrying-value	2,133	[1]	2,379	[1]		2,133	[1]
Interest Rate	8.00%		8.00%
Schaumburg, Illinios [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unrecorded interest income related to impaired loan			2,939		2,647
Office Building [Member] | Greenville, South Carolina [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Net proceeds from sale of properties						$11,491
[1]	Loan carrying value includes accrued interest and is net of origination costs and loan losses.
[2]	Loan satisfied during 2014.
[3]	Borrowers are in default and the Company commenced foreclosure proceedings. Tenant at office property collateral terminated its lease. The Company recognized a loan loss of $13,939 during 2013. During 2014 and 2013, the Company recognized $1,284 and $1,737, respectively, of interest income relating to the impaired loan and the loan had an average recorded investment value of $12,812 and $25,562 during 2014 and 2013, respectively. At DecemberB 31, 2014, the impaired loan receivable had a contractual unpaid balance of $26,786.
[4]	The Company recorded a $2,500 loan loss in 2014 as the Company determined it was probable that it would not collect the amount owed at maturity. During 2014, the Company recognized $468 of interest income relating to the impaired loan and the loan had an average recorded investment of $6,001 during 2014. At DecemberB 31, 2014, the impaired loan receivable had a contractual unpaid balance of $5,810.

Fair_Value_Measurements_Schedu

Fair Value Measurements - Schedule of Fair Value Measurements Inputs (Details) (USD $)	Dec. 31, 2014		Dec. 31, 2013
In Thousands, unless otherwise specified
Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Interest rate swap assets	$1,153		$4,439
Interest rate swap liabilities	-749
Fair Value, Measurements, Nonrecurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired real estate assets	25,679	[1]	12,549	[1]
Impaired loan receivable	3,296	[1]	12,610	[1]
Impaired investments in and advances to non-consolidated entities			683	[1]
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	[1]	0	[1]
Impaired loan receivable	0	[1]	0	[1]
Impaired investments in and advances to non-consolidated entities			0	[1]
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	1,153		4,439
Interest rate swap liabilities	-749
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	[1]	0	[1]
Impaired loan receivable	0	[1]	0	[1]
Impaired investments in and advances to non-consolidated entities			0	[1]
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	25,679	[1]	12,549	[1]
Impaired loan receivable	3,296	[1]	12,610	[1]
Impaired investments in and advances to non-consolidated entities			$683	[1]
[1]	Represents a non-recurring fair value measurement.

Fair_Value_Measurements_Fair_V

Fair Value Measurements - Fair Value, by Balance Sheet Grouping (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Carrying Amount [Member]
Assets
Loans Receivable (Level 3)	$105,635	$99,443
Liabilities
Debt (Level 3)	2,092,675	2,055,807
Fair Value [Member]
Assets
Loans Receivable (Level 3)	105,061	95,734
Liabilities
Debt (Level 3)	$2,091,364	$2,028,558

Investment_in_and_Advances_to_1

Investment in and Advances to Non-Consolidated Entities (Details) (USD $)	12 Months Ended			1 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Nov. 30, 2014	Aug. 31, 2013	Oct. 31, 2013	Mar. 31, 2013	Jul. 31, 2012	Oct. 31, 2014
			partnership
Investments in and Advances to Affiliates [Line Items]
Investment in joint venture	$2,948,000	$8,193,000	$20,172,000
Number of joint venture formed during period			2
Lexington Reality Advisors Inc [Member]
Investments in and Advances to Affiliates [Line Items]
Advisory fees	417,000	512,000	875,000
Mortgages [Member]
Investments in and Advances to Affiliates [Line Items]
Mortgage debt	5,503,000
Houston, Texas [Member]
Investments in and Advances to Affiliates [Line Items]
Anticipated construction cost				86,491,000
Maximum construction financing	56,686,000
Baltimore, Maryland [Member]
Investments in and Advances to Affiliates [Line Items]
Lease Term (Years)					99 years
Investment in joint venture					5,000,000
Joint Venture [Member]
Investments in and Advances to Affiliates [Line Items]
Co-venture equity ownership percentage						15.00%
Lease Term (Years)						20 years
Investment in joint venture						39,456,000
Advances to affiliate						18,791,000
Debt interest rate percentage						4.01%
Joint Venture [Member] | Nonrecourse Mortgage [Member]
Investments in and Advances to Affiliates [Line Items]
Debt interest rate percentage			4.70%
Mortgage debt			15,260,000
Joint Venture [Member] | Houston, Texas [Member]
Investments in and Advances to Affiliates [Line Items]
Co-venture equity ownership percentage	25.00%
Lease Term (Years)				20 years
Joint Venture [Member] | Palm Beach Gardens, Florida [Member]
Investments in and Advances to Affiliates [Line Items]
Co-venture equity ownership percentage			36.00%				25.00%
Lease Term (Years)			15 years
Advances to affiliate			12,000,000
Property purchase price			29,750,000
Distributions payable to real estate partnerships							2,557,000
Joint Venture [Member] | Humble, Texas [Member]
Investments in and Advances to Affiliates [Line Items]
Co-venture equity ownership percentage			15.00%
Lease Term (Years)			17 years
Property purchase price			27,750,000
Partnership [Member]
Investments in and Advances to Affiliates [Line Items]
Economic interest in joint venture			100.00%
Number of partnerships	5
Partnership [Member] | Minimum [Member]
Investments in and Advances to Affiliates [Line Items]
Co-venture equity ownership percentage	27.00%
Partnership [Member] | Maximum [Member]
Investments in and Advances to Affiliates [Line Items]
Co-venture equity ownership percentage	40.00%
Partnership [Member] | Mortgages [Member]
Investments in and Advances to Affiliates [Line Items]
Mortgage debt	13,757,000
Interest rate range, maximum	5.20%
Pemlex LLC [Member]
Investments in and Advances to Affiliates [Line Items]
Proceeds from divestiture of interest in consolidated subsidiaries								13,218,000
Gain (loss) on disposition of subsidiary								0
Concord and CDH CDO [Member]
Investments in and Advances to Affiliates [Line Items]
Carrying value of equity method investments			0
Investment sold, carrying amount			7,000,000
Other Nonconsolidated Entity [Member]
Investments in and Advances to Affiliates [Line Items]
Loss on impairment	930,000	925,000
Realized gain (loss) on disposal									$87,000

Mortgages_and_Notes_Payable_De

Mortgages and Notes Payable (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Debt Instrument [Line Items]
Mortgages and notes payable	$945,216,000	$1,197,489,000
Weighted-average interest rate	5.20%	5.30%
Credit facility borrowings	0	48,000,000
Gains (charges) on debt satisfaction from continuing operations	-7,016,000	-11,811,000	12,000
Interest paid, capitalized	3,441,000	2,397,000	3,062,000
Secured Term Loan 1 [Member]
Debt Instrument [Line Items]
Face Amount	25,000,000
Secured Term Loan 2 [Member]
Debt Instrument [Line Items]
Face Amount	35,551,000
Gains (charges) on debt satisfaction from continuing operations	1,578,000
Mortgages and Notes Payable [Member]
Scheduled Principal and Balloon Payments on Mortgages and Notes Payable
2015	170,440,000
2016	154,337,000
2017	93,469,000
2018	292,297,000
2019	358,835,000
Thereafter	380,838,000
Long-term debt	1,450,216,000
Unsecured Revolving Credit Facility, Expiring February 2018 [Member] | Unsecured Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Face Amount	400,000,000
Basis spread on variable at the end of the period	1.15%
Credit facility borrowings	0
Unsecured Revolving Credit Facility, Expiring February 2018 [Member] | Line of Credit [Member]
Debt Instrument [Line Items]
Outstanding letters of credit	14,644,000
Remaining borrowing capacity	385,356,000
Term Loan Facility from Key Bank [Member] | Unsecured Term Loan [Member]
Debt Instrument [Line Items]
Face Amount	250,000,000
Basis spread on variable at the end of the period	1.35%
Debt instrument, term	5 years
Term Loan Facility from Key Bank [Member] | Interest Rate Swap [Member]
Debt Instrument [Line Items]
Weighted-average interest rate	1.09%
Unsecured Revolving Credit Facility, Expiring January 2019 [Member] | Unsecured Term Loan [Member]
Debt Instrument [Line Items]
Face Amount	$255,000,000
Basis spread on variable at the end of the period	1.75%
Unsecured Revolving Credit Facility, Expiring January 2019 [Member] | Interest Rate Swap [Member]
Debt Instrument [Line Items]
Weighted-average interest rate	1.42%
Minimum [Member]
Debt Instrument [Line Items]
Effective interest rate	2.20%	3.60%
Minimum [Member] | Unsecured Revolving Credit Facility, Expiring February 2018 [Member] | Unsecured Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Interest rate stated percentage rate range minimum excluding LIBOR	0.95%
Minimum [Member] | Term Loan Facility from Key Bank [Member] | Unsecured Term Loan [Member]
Debt Instrument [Line Items]
Interest rate stated percentage rate range minimum excluding LIBOR	1.10%
Minimum [Member] | Unsecured Revolving Credit Facility, Expiring January 2019 [Member] | Unsecured Term Loan [Member]
Debt Instrument [Line Items]
Interest rate stated percentage rate range minimum excluding LIBOR	1.50%
Maximum [Member]
Debt Instrument [Line Items]
Effective interest rate	8.50%	8.50%
Maximum [Member] | Unsecured Revolving Credit Facility, Expiring February 2018 [Member] | Unsecured Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Interest rate stated percentage rate range minimum excluding LIBOR	1.73%
Maximum [Member] | Term Loan Facility from Key Bank [Member] | Unsecured Term Loan [Member]
Debt Instrument [Line Items]
Interest rate stated percentage rate range minimum excluding LIBOR	2.10%
Maximum [Member] | Unsecured Revolving Credit Facility, Expiring January 2019 [Member] | Unsecured Term Loan [Member]
Debt Instrument [Line Items]
Interest rate stated percentage rate range minimum excluding LIBOR	2.25%

Senior_Notes_Convertible_Notes2

Senior Notes, Convertible Notes, Exchangeable Notes and Trust Preferred Securities - Schedule of Debt Instrument Redemptions (Details) (USD $)	Dec. 31, 2014
Senior Notes [Member]
Debt Instrument, Redemption [Line Items]
Face Amount	$500,000,000
4.40% Senior Note [Member] | Senior Notes Due 2024 [Member]
Debt Instrument, Redemption [Line Items]
Face Amount	250,000,000
Interest Rate	4.40%
Issue Price	99.88%
4.25% Senior Note [Member] | Senior Notes Due 2023 [Member]
Debt Instrument, Redemption [Line Items]
Face Amount	$250,000,000
Interest Rate	4.25%
Issue Price	99.03%

Senior_Notes_Convertible_Notes3

Senior Notes, Convertible Notes, Exchangeable Notes and Trust Preferred Securities - Schedule of Long-term Debt Instruments (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2010	Dec. 31, 2007
6.00% Convertible Guaranteed Note [Member]
Debt Instrument [Line Items]
Debt interest rate percentage	6.00%	6.00%	6.00%	6.00%
Face Amount	$16,228,000	$28,991,000		$115,000,000
Unamortized discount	-564,000	-1,500,000
Carrying amount of debt component	15,664,000	27,491,000
Carrying amount of equity component	-33,160,000	-26,032,000
Effective interest rate	8.10%	8.10%
Aggregate if-converted value in excess of aggregate principal amount	10,432,000	14,296,000
Coupon interest	1,545,000	2,296,000	6,634,000
Discount amortization	438,000	658,000	1,868,000
Interest Expense	1,983,000	2,954,000	8,502,000
5.45% Exchangeable Guaranteed Note [Member]
Debt Instrument [Line Items]
Debt interest rate percentage					5.45%
Face Amount					450,000,000
Coupon interest	0	0	188,000
Discount amortization	0	0	34,000
Interest Expense	$0	$0	$222,000

Senior_Notes_Convertible_Notes4

Senior Notes, Convertible Notes, Exchangeable Notes and Trust Preferred Securities - Narrative (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2010	Dec. 31, 2007
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percent of notes required to be repurchased at the option of the holders on set dates				100.00%
Converted instrument, amount	$12,763,000	$54,905,000	$31,104,000
Issuance of common shares upon conversion of convertible notes (in shares)	1,904,542	7,944,673	4,487,060
Cash payment during conversion	233,000	3,270,000	2,427,000
Debt satisfaction expense	2,436,000	13,536,000	7,842,000
Repurchase of exchangeable notes	0	0	62,150,000
Senior Notes [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Face Amount	500,000,000
6.00% Convertible Guaranteed Note [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Face Amount	16,228,000	28,991,000		115,000,000
Debt interest rate percentage	6.00%	6.00%	6.00%	6.00%
Convertible debt conversion ratio	151.5965
Convertible debt conversion price	$6.60
4.25% Senior Note [Member] | Senior Notes Due 2023 [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Face Amount	250,000,000
Debt interest rate percentage	4.25%
5.45% Exchangeable Guaranteed Note [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Face Amount					450,000,000
Debt interest rate percentage					5.45%
Repurchase of exchangeable notes			62,150,000
Debt satisfaction charges			44,000
6.804% Trust Preferred Securities [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Face Amount					200,000,000
Debt interest rate percentage					6.80%
Principal amount outstanding on Trust Preferred Securities	$129,120,000	$129,120,000
Basis spread on variable rate					1.70%

Senior_Notes_Convertible_Notes5

Senior Notes, Convertible Notes, Exchangeable Notes and Trust Preferred Securities - Schedule of Maturities of Long-term Debt (Details) (Senior Notes, Convertible Notes, Exchangeable Notes, and Trust Preferred Securities [Member], USD $)	Dec. 31, 2014
In Thousands, unless otherwise specified
Senior Notes, Convertible Notes, Exchangeable Notes, and Trust Preferred Securities [Member]
Debt Instrument [Line Items]
2015	$0
2016	0
2017	16,228	[1]
2018	0
2019	0
Thereafter	629,120
Long-term Debt, Gross	645,348
Debt discounts	-2,889
Long-term debt	$642,459
[1]	Although the 6.00% Convertible Guaranteed Notes mature in 2030, the notes can be put to the Company in 2017.

Derivatives_and_Hedging_Activi2

Derivatives and Hedging Activities (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2012	Dec. 31, 2013
Derivative [Line Items]
Expected amount of derivative related interest to be reclassified to interest expense over the next 12 months	$4,737,000
Interest Rate Swap [Member]
Derivative [Line Items]
Settlement amount		3,539,000
Reclassified from AOCI into Income		1,837,000
Interest Rate Swap [Member] | Designated as Hedging Instrument [Member] | Other Assets [Member]
Derivative [Line Items]
Derivative asset	1,153,000		4,439,000
Interest Rate Swap [Member] | Designated as Hedging Instrument [Member] | Accounts Payable And Other Liabilities [Member]
Derivative [Line Items]
Derivative liabilities	-749,000
Cash Flow Hedging [Member] | Interest Rate Swap [Member] | Designated as Hedging Instrument [Member]
Derivative [Line Items]
Face Amount	505,000,000
Number of derivative instruments held	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]
Reclassified from AOCI into Income	5,525,000		3,104,000
Amount of Loss Recognized in OCI on Derivative (Effective Portion)	($9,560,000)		$7,559,000

Leases_Details

Leases (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Minimum Future Rental Receipts [Abstract]
2015	$341,950
2016	327,046
2017	300,418
2018	275,572
2019	248,604
Thereafter	6,203,163
Future Minimum Payments Receivable	7,696,753
Leaseholds Interests [Member]
Future Rental Payments [Abstract]
2015	5,137
2016	4,927
2017	4,880
2018	4,664
2019	4,134
Thereafter	37,963
Future Minimum Payments Due	61,705
Rent expense for leasehold interests	919	1,284	1,198
Corporate HQ and Office Space [Member]
Future Rental Payments [Abstract]
2015	1,261
2016	506
2017	1,256
2018	1,224
2019	1,224
Thereafter	8,019
Rent expense for leasehold interests	1,356	1,338	1,029
Incentive from lessor	$845

Concentration_of_Risk_Details

Concentration of Risk (Details)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
	tenant	tenant	tenant
Concentration Risk [Line Items]
Number of tenants representing more than 10% of rental revenue	0	0	0
Maximum [Member] | Tenant Concentration Risk [Member]
Concentration Risk [Line Items]
Concentration risk percentage	10.00%	10.00%	10.00%

Equity_Additional_Information_

Equity - Additional Information (Details) (USD $)	12 Months Ended			0 Months Ended	1 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Jun. 30, 2014	Jul. 31, 2014	Jul. 31, 2013
Equity [Line Items]
Common shares issued through public offering and direct share purchase plan during period	2,600,795	36,012,313	18,289,557
Proceeds from issuance of common shares	$23,563,000	$434,927,000	$162,747,000
Shares, net of forfeitures	37,678	1,893,409	643,450
Effect net of tax	404,000	4,439,000
OP unit equivalent in common shares	1.13
OP units, redemptions	1,962,000	0	0
Shares issued for units redeemed	29,086	202,241	257,427
Partners' capital account, exchanges and conversions	-148,000	-1,053,000	-1,343,000
OP units outstanding	3,422,000
Payments to acquire interest in joint venture	2,100,000	8,918,000	0
Office Building [Member] | Joint Venture [Member] | Philadelphia, Pennsylvania [Member]
Equity [Line Items]
Payments to acquire interest in joint venture					2,100,000
Real state, ownership percentage				80.50%	87.50%
Industrial Property [Member] | Joint Venture [Member] | Long Island City, New York [Member]
Equity [Line Items]
Payments to acquire interest in joint venture						8,918,000
Former LCIF II Partners [Member]
Equity [Line Items]
OP units redeemed	170,193
OP units, redemptions	1,962,000
Series C [Member]
Equity [Line Items]
Dividend rate, per-dollar-amount	$3.25
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%
Cumulative Convertible [Member] | Series C [Member]
Equity [Line Items]
Preferred shares outstanding	1,935,400	1,935,400
Preferred shares, liquidation preference	96,770,000
Public Offering And Direct Share Purchase Plan Proceeds [Member]
Equity [Line Items]
Proceeds from issuance of common shares	25,813,000	399,566,000	164,429,000
At The Market [Member]
Equity [Line Items]
Common shares issued through public offering and direct share purchase plan during period		3,409,927
Value authorized		100,000,000
Value, new issues		$36,884,000

Equity_Schedule_of_Stock_Redee

Equity - Schedule of Stock Redeemed and Retired (Details) (USD $)	12 Months Ended
In Thousands, except Share data, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013		Dec. 31, 2012
8.05% Series B Cumulative Redeemable Preferred Stock [Member]
Class of Stock [Line Items]
Shares redeemed and retired		0		2,740,874
Redemption and Repurchase Costs		$0	[1]	$69,459	[1]
Deemed dividend	0	0	[2]	2,346	[2]
6.50% Series C Cumulative Convertible Preferred Stock [Member]
Class of Stock [Line Items]
Shares redeemed and retired		0		34,800
Redemption and Repurchase Costs		0		1,462
Discount (Deemed negative dividend)	0	0	[2]	-229	[2]
7.55% Series D Cumulative Redeemable Preferred Stock [Member]
Class of Stock [Line Items]
Shares redeemed and retired		6,200,000		0
Redemption and Repurchase Costs		155,621	[1]	0	[1]
Deemed dividend	$0	$5,230	[2]	$0	[2]
[1]	Includes accrued and unpaid dividends.
[2]	Represents the difference between the redemption/repurchase cost and historical GAAP cost. Accordingly, net income (loss) was adjusted for the deemed dividends/deemed negative dividends to arrive at net income (loss) attributable to common shareholders.

Equity_Schedule_of_Changes_in_

Equity - Schedule of Changes in AOCI (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Gains and Losses on Cash Flow Hedges, Beginning	$4,439
Other comprehensive income (loss) before reclassifications	-9,560
Amounts of loss reclassified from accumulated other comprehensive loss to interest expense	5,525
Gains and Losses on Cash Flow Hedges, Ending	$404

Equity_Schedule_of_Effects_of_

Equity - Schedule of Effects of Changes in Noncontrolling Interest (Details) (USD $)	3 Months Ended								12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
Net income	$38,185	$42,177	$15,287	$1,814	($7,001)	$5,155	$7,832	($2,123)	$97,463	$3,863	$184,638
Increase in additional paid-in-capital for redemption of noncontrolling OP units									-858	1,053	1,343
Change from net income attributable to shareholders and transfers from noncontrolling interests									92,246	2,683	181,659
Accumulated Distributions in Excess of Net Income [Member]
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
Net income									$93,104	$1,630	$180,316

Benefit_Plans_Additional_Infor

Benefit Plans - Additional Information (Details) (USD $)	12 Months Ended			0 Months Ended
In Thousands, except Share data, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2010	Jan. 08, 2010	Dec. 31, 2008	Dec. 31, 2011
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Common Stock, Shares Held in Employee Trust, Shares	427,531	427,531
Common share options granted (shares)	0	0	0
Recognized compensation expense	$1,038	$1,037	$1,197
Exercises in period, intrinsic value	2,780	8,607	1,603
Options, exercisable, intrinsic value	4,557
Initial vesting percentage	25.00%
Vesting percentage	100.00%
Cost recognized	299	298	279
Allocated share-based compensation expense	7,550	7,145	3,030
Non-vested Shares [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Unrecognized compensation costs	15,183
Non-options, nonvested, number	1,970,385	2,521,046	1,465,446
Number of shares available for grant	4,012,252
Total compensation cost not yet recognized, period for recognition	4 years
Options 2010 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Common share options granted (shares)				1,248,501
Common share options exercise price (usd per share)				$7.95
Deferred compensation equity	2,422
Options 2009 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Common share options granted (shares)					1,265,500
Common share options exercise price (usd per share)					$6.39
Vesting rate					20.00%
Deferred compensation equity	2,771
Recognized compensation expense average period	5 years
Options 2008 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Common share options granted (shares)						2,000,000
Common share options exercise price (usd per share)						$5.60
Number of trading period days						20 days
Options convertible to common shares						1.13
Options converted to common shares exercise price						$4.97
Deferred compensation equity	2,480
Recognized compensation expense average period	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						$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						$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]
Vesting rate						50.00%
Employee Stock Option [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Common share options exercise price (usd per share)	$7.05	$6.95	$6.44				$6.36
Vesting rate				20.00%
Unrecognized compensation costs	$480
Shares Subject to Time [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Non-options, nonvested, number	1,895,245
Shares Subject to Performance [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Non-options, nonvested, number	75,140

Benefit_Plans_Assumptions_Used

Benefit Plans - Assumptions Used (Details) (USD $)	12 Months Ended
	Dec. 31, 2014
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_Act

Benefit Plans - Share Option Activity (Details) (Share Options [Member], USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Share Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Number of shares outstanding, beginning	1,955,701	3,480,080	3,888,281
Price per share outstanding, beginning	$6.95	$6.44	$6.36
Number of shares exercised	-594,791	-1,519,179	-408,201
Price per share exercised	$6.71	$5.77	$5.73
Number of shares forfeited	-10,500	-5,200
Exercise price per share forfeited	$7.46	$7.47
Number of shares outstanding, ending	1,350,410	1,955,701	3,480,080
Price per share outstanding, ending	$7.05	$6.95	$6.44

Benefit_Plans_NonVested_Share_

Benefit Plans - Non-Vested Share Activity (Details) (Non-vested Shares [Member], USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Non-vested Shares [Member]
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	2,521,046	1,465,446
Value per share outstanding, beginning	$10.46	$8.64
Number of shares granted		1,829,400
Value per share granted		$10.52
Number of shares vested	-537,003	-770,229
Value per share vested	$9.16	$7.14
Number of shares forfeited	-13,658	-3,571
Value per share forfeited	$9.96	$9.21
Number of shares outstanding, ending	1,970,385	2,521,046
Value per share outstanding, ending	$10.82	$10.46

Related_Party_Transactions_Det

Related Party Transactions (Details) (Vorando Realty Trust [Member], USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Vorando Realty Trust [Member]
Related Party Transaction [Line Items]
Rent revenue recognized	$255	$744	$842
Rent expense for corporate headquarters	$1,252	$1,225	$919

Income_Taxes_Components_of_Inc

Income Taxes - Components of Income Tax Provision (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Current:
Federal	$145	($1,445)	($371)
State and local	-1,130	-1,593	-1,082
NOL utilized	0	586	401
Deferred:
Federal	-91	-595	141
State and local	-33	-130	45
Benefit (provision) for income taxes	($1,109)	($3,177)	($866)

Income_Taxes_Additional_Inform

Income Taxes - Additional Information (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Taxes [Line Items]
Deferred tax assets (liabilities), net	($19,000)	$106,000
Deferred tax liability written off	0	-150,000	0
Permanent differences	0	1,936,000	37,000
Operating loss carryforwards	0	0
State and Local Jurisdiction [Member]
Income Taxes [Line Items]
State taxes paid	$1,183,000	$1,280,000	$968,000

Income_Taxes_Statutory_Federal

Income Taxes - Statutory Federal Income Tax (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Tax Disclosure [Abstract]
Federal provision at statutory tax rate (34%)	($43)	$164	($573)
Federal tax rate	34.00%	34.00%	34.00%
State and local taxes, net of federal benefit	-9	22	-110
Other	-1,057	-3,363	-183
Benefit (provision) for income taxes	($1,109)	($3,177)	($866)

Income_Taxes_Summary_of_Averag

Income Taxes - Summary of Average Taxable Nature of Dividends (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Common [Member]
Income Tax Contingency [Line Items]
Total dividends per share, common	$0.67	$0.60	$0.53
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	49.44%	35.53%	95.68%
Common [Member] | Fifteen Percent Rate, Qualifying Dividend [Member]
Income Tax Contingency [Line Items]
Taxable percentage allocation on dividends	0.05%	4.11%	0.99%
Common [Member] | Fifteen Percent Rate Gain [Member]
Income Tax Contingency [Line Items]
Taxable percentage allocation on dividends	0.00%	2.09%	0.00%
Common [Member] | Return of Capital [Member]
Income Tax Contingency [Line Items]
Taxable percentage allocation on dividends	50.51%	58.27%	3.33%
Series B Cumulative Redeemable Preferred Shares [Member]
Income Tax Contingency [Line Items]
Total dividends per share, preferred	$0	$0	$1.34
Taxable percentage allocation on dividends	0.00%	0.00%	100.00%
Series B Cumulative Redeemable Preferred Shares [Member] | Ordinary Income [Member]
Income Tax Contingency [Line Items]
Taxable percentage allocation on dividends	0.00%	0.00%	98.98%
Series B Cumulative Redeemable Preferred Shares [Member] | Fifteen Percent Rate, Qualifying Dividend [Member]
Income Tax Contingency [Line Items]
Taxable percentage allocation on dividends	0.00%	0.00%	1.02%
Series B Cumulative Redeemable Preferred Shares [Member] | Fifteen Percent Rate Gain [Member]
Income Tax Contingency [Line Items]
Taxable percentage allocation on dividends	0.00%	0.00%	0.00%
Series B 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%
Series C Cumulative Redeemable Preferred Shares [Member]
Income Tax Contingency [Line Items]
Total dividends per share, preferred	$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	99.90%	85.14%	98.98%
Series C Cumulative Redeemable Preferred Shares [Member] | Fifteen Percent Rate, Qualifying Dividend [Member]
Income Tax Contingency [Line Items]
Taxable percentage allocation on dividends	0.10%	9.85%	1.02%
Series C Cumulative Redeemable Preferred Shares [Member] | Fifteen Percent Rate Gain [Member]
Income Tax Contingency [Line Items]
Taxable percentage allocation on dividends	0.00%	5.01%	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%
Series D Cumulative Redeemable Preferred Shares [Member]
Income Tax Contingency [Line Items]
Total dividends per share, preferred	$0	$1.04	$1.89
Taxable percentage allocation on dividends	0.00%	100.00%	100.00%
Series D Cumulative Redeemable Preferred Shares [Member] | Ordinary Income [Member]
Income Tax Contingency [Line Items]
Taxable percentage allocation on dividends	0.00%	85.14%	98.98%
Series D Cumulative Redeemable Preferred Shares [Member] | Fifteen Percent Rate, Qualifying Dividend [Member]
Income Tax Contingency [Line Items]
Taxable percentage allocation on dividends	0.00%	9.85%	1.02%
Series D Cumulative Redeemable Preferred Shares [Member] | Fifteen Percent Rate Gain [Member]
Income Tax Contingency [Line Items]
Taxable percentage allocation on dividends	0.00%	5.01%	0.00%
Series D 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) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
	executive_officer
	Guarantee
Commitments and Contingencies [Line Items]
Payments for capital improvements	$122,395	$447,571	$98,083
Number of guarantees outstanding	2
Number of executive officers entitled to severance benefits	4
Base Building Improvements [Member]
Commitments and Contingencies [Line Items]
Obligation for tenant improvements	1,384
Payment of the Base Building Improvement, Tenant Improvement Alloance, and Lease Commissions [Member]
Commitments and Contingencies [Line Items]
Obligation for tenant improvements	417
Byhalia, Mississippi [Member]
Commitments and Contingencies [Line Items]
Payments for capital improvements	$15,300

Supplemental_Disclosure_of_Sta1

Supplemental Disclosure of Statement of Cash Flow Information (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Other Significant Noncash Transactions [Line Items]
Interest paid	$100,080,000	$92,788,000	$101,262,000
Income taxes paid	859,000	4,666,000	1,018,000
Interests Sold [Member]
Other Significant Noncash Transactions [Line Items]
Real estate number of properties sold (in # of properties)		2
Real estate non-recourse mortgage debt assumed	30,140,000	40,356,000	8,921,000
Conveyed Interest [Member]
Other Significant Noncash Transactions [Line Items]
Properties with conveyed interest	1	4	2
Seller financing	9,900,000
Original debt conversion amount		$49,510,000	$12,409,000

Unaudited_Quarterly_Financial_2

Unaudited Quarterly Financial Data (Details) (USD $)	3 Months Ended																12 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Dec. 31, 2014		Sep. 30, 2014		Jun. 30, 2014		Mar. 31, 2014		Dec. 31, 2013		Sep. 30, 2013		Jun. 30, 2013		Mar. 31, 2013		Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Quarterly Financial Information Disclosure [Abstract]
Total gross revenues	$107,954	[1]	$106,708	[1]	$105,571	[1]	$104,139	[1]	$100,458	[1]	$87,895	[1]	$88,398	[1]	$85,159	[1]	$424,372	$361,910	$297,008
Net income (loss)	38,185		42,177		15,287		1,814		-7,001		5,155		7,832		-2,123		97,463	3,863	184,638
Net income (loss) attributable to common shareholders	$35,700		$38,720		$12,743		($839)		($8,923)		$2,978		($849)		($7,295)		$93,104	$1,630	$180,316
Net income (loss) attributable to common shareholders - basic per share	$0.15		$0.17		$0.05		$0		($0.04)		$0.01		$0		($0.04)		$0.38	($0.07)	$0.99
Net income (loss) attributable to common shareholders - diluted per share	$0.15		$0.17		$0.05		$0		($0.04)		$0.01		$0		($0.04)		$0.38	($0.07)	$0.93
[1]	All periods have been adjusted to reflect the impact of properties sold during the years ended DecemberB 31, 2014 and 2013, and properties classified as held for sale, which are reflected in discontinued operations in the Consolidated Statements of Operations.

Subsequent_Events_Details

Subsequent Events (Details) (USD $)	2 Months Ended
	Feb. 20, 2015	Dec. 31, 2014
Mortgages [Member]
Subsequent Event [Line Items]
Face amount		$5,503,000
Subsequent Event [Member] | Mortgages [Member] | Non-recourse Mortgage Secured by Land in New York, New York [Member]
Subsequent Event [Line Items]
Debt instrument, term	10 years
Debt interest rate percentage	4.10%
Face amount	29,193,000
Golf Course [Member] | Subsequent Event [Member] | Venice, Florida [Member]
Subsequent Event [Line Items]
Area of real estate property (acres)	360
Payments to acquire real estate	16,850,000
Lease term (years)	40 years
Industrial Property [Member] | Subsequent Event [Member] | Detroit, Michigan [Member]
Subsequent Event [Line Items]
Lease term (years)	20 years
Payments to acquire real estate, forward commitment	$29,680,000

Schedule_III_Real_Estate_and_A1

Schedule III - Real Estate and Accumulated Depreciation and Amortization - Schedule III (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	945,216
Land and Land Estates	755,168
Buildings and Improvements	2,901,446
Total	3,671,560	3,812,294	3,564,466	3,172,246
Accumulated Depreciation and Amortization	795,486	775,617	738,068	638,368
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	0
Industrial Property [Member] | Anniston, Alabama [Member] | Minimum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	8 years
Industrial Property [Member] | Anniston, Alabama [Member] | Maximum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	24 years
Industrial Property [Member] | Anniston, Alabama [Member] | Asset Component 1 [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	15 years
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	2,452
Useful life computing depreciation in latest income statement (years)	40 years
Industrial Property [Member] | Tampa, Florida [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Land and Land Estates	2,160
Buildings and Improvements	7,347
Total	9,507
Accumulated Depreciation and Amortization	5,664
Industrial Property [Member] | Tampa, Florida [Member] | Minimum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	9 years
Industrial Property [Member] | Tampa, Florida [Member] | Maximum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	40 years
Industrial Property [Member] | McDonough, Georgia [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	22,512
Land and Land Estates	2,463
Buildings and Improvements	24,291
Total	26,754
Accumulated Depreciation and Amortization	5,175
Useful life computing depreciation in latest income statement (years)	40 years
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	895
Industrial Property [Member] | Rantoul, Illinois [Member] | Minimum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	20 years
Industrial Property [Member] | Rantoul, Illinois [Member] | Maximum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	40 years
Industrial Property [Member] | Rantoul, Illinois [Member] | Asset Component 1 [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	21 years
Industrial Property [Member] | Dry Ridge, Kentucky [Member] | Cross-collateralized [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	2,351
Land and Land Estates	560
Buildings and Improvements	12,553
Total	13,113
Accumulated Depreciation and Amortization	4,144
Industrial Property [Member] | Dry Ridge, Kentucky [Member] | Cross-collateralized [Member] | Minimum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	22 years
Industrial Property [Member] | Dry Ridge, Kentucky [Member] | Cross-collateralized [Member] | Maximum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	40 years
Industrial Property [Member] | Elizabethtown, Kentucky [Member] | Elizabethtown, KY LTL Industrial Acquired Jun-05 [Member] | Cross-collateralized [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	11,986
Land and Land Estates	890
Buildings and Improvements	26,868
Total	27,758
Accumulated Depreciation and Amortization	8,870
Industrial Property [Member] | Elizabethtown, Kentucky [Member] | Elizabethtown, KY LTL Industrial Acquired Jun-05 [Member] | Cross-collateralized [Member] | Minimum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	25 years
Industrial Property [Member] | Elizabethtown, Kentucky [Member] | Elizabethtown, KY LTL Industrial Acquired Jun-05 [Member] | Cross-collateralized [Member] | Maximum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	40 years
Industrial Property [Member] | Elizabethtown, Kentucky [Member] | Elizabethtown, KY LTL Industrial Acquired Jun-05, Property 2 [Member] | Cross-collateralized [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	2,252
Land and Land Estates	352
Buildings and Improvements	4,862
Total	5,214
Accumulated Depreciation and Amortization	1,605
Industrial Property [Member] | Elizabethtown, Kentucky [Member] | Elizabethtown, KY LTL Industrial Acquired Jun-05, Property 2 [Member] | Cross-collateralized [Member] | Minimum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	25 years
Industrial Property [Member] | Elizabethtown, Kentucky [Member] | Elizabethtown, KY LTL Industrial Acquired Jun-05, Property 2 [Member] | Cross-collateralized [Member] | Maximum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	40 years
Industrial Property [Member] | Hopkinsville, Kentucky [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	7,003
Land and Land Estates	631
Buildings and Improvements	16,154
Total	16,785
Accumulated Depreciation and Amortization	5,624
Industrial Property [Member] | Hopkinsville, Kentucky [Member] | Minimum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	25 years
Industrial Property [Member] | Hopkinsville, Kentucky [Member] | Maximum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	40 years
Industrial Property [Member] | Owensboro, Kentucky [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	782
Useful life computing depreciation in latest income statement (years)	40 years
Industrial Property [Member] | Owensboro, Kentucky [Member] | Cross-collateralized [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	1,959
Land and Land Estates	393
Buildings and Improvements	11,956
Total	12,349
Accumulated Depreciation and Amortization	4,488
Industrial Property [Member] | Owensboro, Kentucky [Member] | Cross-collateralized [Member] | Minimum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	25 years
Industrial Property [Member] | Owensboro, Kentucky [Member] | Cross-collateralized [Member] | Maximum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	40 years
Industrial Property [Member] | Shreveport, Louisiana [Member] | Shreveport, LA LTL Industrial Acquired Mar-07 [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	19,000
Land and Land Estates	860
Buildings and Improvements	21,840
Total	22,700
Accumulated Depreciation and Amortization	4,254
Useful life computing depreciation in latest income statement (years)	40 years
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	932
Industrial Property [Member] | Shreveport, Louisiana [Member] | Shreveport, LA Industrial Acquired Jun-12 [Member] | Minimum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	8 years
Industrial Property [Member] | Shreveport, Louisiana [Member] | Shreveport, LA Industrial Acquired Jun-12 [Member] | Maximum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	40 years
Industrial Property [Member] | Shreveport, Louisiana [Member] | Shreveport, LA Industrial Acquired Jun-12 [Member] | Asset Component 1 [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	10 years
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	144
Industrial Property [Member] | Minneapolis, Minnesota [Member] | Minimum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	3 years
Industrial Property [Member] | Minneapolis, Minnesota [Member] | Maximum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	40 years
Industrial Property [Member] | Minneapolis, Minnesota [Member] | Asset Component 1 [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	29 years
Industrial Property [Member] | Byhalia, Mississippi [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	15,000
Land and Land Estates	1,006
Buildings and Improvements	21,483
Total	22,489
Accumulated Depreciation and Amortization	1,969
Useful life computing depreciation in latest income statement (years)	40 years
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	2,473
Industrial Property [Member] | Shelby, North Carolina [Member] | Minimum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	11 years
Industrial Property [Member] | Shelby, North Carolina [Member] | Maximum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	40 years
Industrial Property [Member] | Shelby, North Carolina [Member] | Asset Component 1 [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	20 years
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	4,759
Useful life computing depreciation in latest income statement (years)	40 years
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	421
Industrial Property [Member] | North Las Vegas, Nevada [Member] | Minimum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	19 years
Industrial Property [Member] | North Las Vegas, Nevada [Member] | Maximum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	40 years
Industrial Property [Member] | North Las Vegas, Nevada [Member] | Asset Component 1 [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	20 years
Industrial Property [Member] | Long Island City, New York [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Land and Land Estates	0
Buildings and Improvements	42,624
Total	42,624
Accumulated Depreciation and Amortization	5,200
Useful life computing depreciation in latest income statement (years)	15 years
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	1,442
Industrial Property [Member] | Chillicothe, Ohio [Member] | Minimum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	6 years
Industrial Property [Member] | Chillicothe, Ohio [Member] | Maximum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	26 years
Industrial Property [Member] | Chillicothe, Ohio [Member] | Asset Component 1 [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	15 years
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	1,835
Industrial Property [Member] | Cincinnati, Ohio [Member] | Minimum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	10 years
Industrial Property [Member] | Cincinnati, Ohio [Member] | Maximum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	40 years
Industrial Property [Member] | Cincinnati, Ohio [Member] | Asset Component 1 [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	14 years
Industrial Property [Member] | Columbus, Ohio [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Land and Land Estates	1,990
Buildings and Improvements	10,580
Total	12,570
Accumulated Depreciation and Amortization	2,783
Useful life computing depreciation in latest income statement (years)	40 years
Industrial Property [Member] | Glenwillow, Ohio [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	15,583
Land and Land Estates	2,228
Buildings and Improvements	24,530
Total	26,758
Accumulated Depreciation and Amortization	5,340
Useful life computing depreciation in latest income statement (years)	40 years
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	5,461
Industrial Property [Member] | Bristol, Pennsylvania [Member] | Minimum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	10 years
Industrial Property [Member] | Bristol, Pennsylvania [Member] | Maximum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	40 years
Industrial Property [Member] | Bristol, Pennsylvania [Member] | Asset Component 1 [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	16 years
Industrial Property [Member] | Bristol, Pennsylvania [Member] | Asset Component 2 [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	30 years
Industrial Property [Member] | Chester, South Carolina [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	9,387
Land and Land Estates	1,629
Buildings and Improvements	8,470
Total	10,099
Accumulated Depreciation and Amortization	722
Industrial Property [Member] | Chester, South Carolina [Member] | Minimum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	9 years
Industrial Property [Member] | Chester, South Carolina [Member] | Maximum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	34 years
Industrial Property [Member] | Chester, South Carolina [Member] | Asset Component 1 [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	13 years
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	3,159
Industrial Property [Member] | Crossville, Tennessee [Member] | Minimum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	17 years
Industrial Property [Member] | Crossville, Tennessee [Member] | Maximum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	40 years
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	226
Industrial Property [Member] | Lewisburg, Tennessee [Member] | Minimum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	12 years
Industrial Property [Member] | Lewisburg, Tennessee [Member] | Maximum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	34 years
Industrial Property [Member] | Lewisburg, Tennessee [Member] | Asset Component 1 [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	18 years
Industrial Property [Member] | Eau Claire, Wisconsin [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Land and Land Estates	421
Buildings and Improvements	5,590
Total	6,011
Accumulated Depreciation and Amortization	556
Industrial Property [Member] | Eau Claire, Wisconsin [Member] | Minimum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	10 years
Industrial Property [Member] | Eau Claire, Wisconsin [Member] | Maximum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	28 years
Industrial Property [Member] | Eau Claire, Wisconsin [Member] | Asset Component 1 [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	15 years
Industrial Property [Member] | Lavonia, Georgia [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	7,959
Land and Land Estates	171
Buildings and Improvements	7,657
Total	7,828
Accumulated Depreciation and Amortization	505
Industrial Property [Member] | Lavonia, Georgia [Member] | Minimum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	8 years
Industrial Property [Member] | Lavonia, Georgia [Member] | Maximum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	40 years
Industrial Property [Member] | Lavonia, Georgia [Member] | Asset Component 1 [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	12 years
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	11,390
Industrial Property [Member] | Memphis, Tennessee [Member] | Memphis, TN Industrial Acquired Feb-88 [Member] | Minimum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	8 years
Industrial Property [Member] | Memphis, Tennessee [Member] | Memphis, TN Industrial Acquired Feb-88 [Member] | Maximum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	15 years
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	1,553
Buildings and Improvements	12,326
Total	13,879
Accumulated Depreciation and Amortization	3,033
Useful life computing depreciation in latest income statement (years)	40 years
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	5,683
Industrial Property [Member] | Moody, Alabama [Member] | Minimum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	15 years
Industrial Property [Member] | Moody, Alabama [Member] | Maximum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	40 years
Industrial Property [Member] | Jacksonville, Florida [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Land and Land Estates	573
Buildings and Improvements	1,592
Total	2,165
Accumulated Depreciation and Amortization	451
Industrial Property [Member] | Jacksonville, Florida [Member] | Minimum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	1 year
Industrial Property [Member] | Jacksonville, Florida [Member] | Maximum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	40 years
Industrial Property [Member] | Des Moines, Iowa [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Land and Land Estates	1,528
Buildings and Improvements	14,247
Total	15,775
Accumulated Depreciation and Amortization	1,367
Industrial Property [Member] | Des Moines, Iowa [Member] | Minimum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	5 years
Industrial Property [Member] | Des Moines, Iowa [Member] | Maximum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	34 years
Industrial Property [Member] | Des Moines, Iowa [Member] | Asset Component 1 [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	11 years
Industrial Property [Member] | Dubuque, Iowa [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	9,303
Land and Land Estates	2,052
Buildings and Improvements	8,443
Total	10,495
Accumulated Depreciation and Amortization	2,530
Industrial Property [Member] | Dubuque, Iowa [Member] | Minimum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	11 years
Industrial Property [Member] | Dubuque, Iowa [Member] | Maximum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	40 years
Industrial Property [Member] | Dubuque, Iowa [Member] | Asset Component 1 [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	12 years
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	604
Useful life computing depreciation in latest income statement (years)	40 years
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	1,160
Useful life computing depreciation in latest income statement (years)	40 years
Industrial Property [Member] | Plymouth, Indiana [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	5,928
Land and Land Estates	254
Buildings and Improvements	7,969
Total	8,223
Accumulated Depreciation and Amortization	686
Industrial Property [Member] | Plymouth, Indiana [Member] | Minimum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	3 years
Industrial Property [Member] | Plymouth, Indiana [Member] | Maximum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	34 years
Industrial Property [Member] | Plymouth, Indiana [Member] | Asset Component 1 [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	6 years
Industrial Property [Member] | North Berwick, Maine [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	6,145
Land and Land Estates	1,383
Buildings and Improvements	32,397
Total	33,780
Accumulated Depreciation and Amortization	6,775
Industrial Property [Member] | North Berwick, Maine [Member] | Minimum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	10 years
Industrial Property [Member] | North Berwick, Maine [Member] | Maximum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	40 years
Industrial Property [Member] | Kalamazoo, Michigan [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	15,295
Land and Land Estates	1,942
Buildings and Improvements	14,169
Total	16,111
Accumulated Depreciation and Amortization	1,328
Industrial Property [Member] | Kalamazoo, Michigan [Member] | Minimum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	8 years
Industrial Property [Member] | Kalamazoo, Michigan [Member] | Maximum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	40 years
Industrial Property [Member] | Kalamazoo, Michigan [Member] | Asset Component 1 [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	9 years
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	1,103
Industrial Property [Member] | Marshall, Michigan [Member] | Marshall, MI Industrial Acquired Sep-12 [Member] | Minimum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	4 years
Industrial Property [Member] | Marshall, Michigan [Member] | Marshall, MI Industrial Acquired Sep-12 [Member] | Maximum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	10 years
Industrial Property [Member] | Marshall, Michigan [Member] | Marshall, MI Industrial Acquired Sep-12 [Member] | Asset Component 1 [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	6 years
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	700
Industrial Property [Member] | Marshall, Michigan [Member] | Marshall, MI Industrial Acquired Aug-87 [Member] | Minimum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	9 years
Industrial Property [Member] | Marshall, Michigan [Member] | Marshall, MI Industrial Acquired Aug-87 [Member] | Maximum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	40 years
Industrial Property [Member] | Marshall, Michigan [Member] | Marshall, MI Industrial Acquired Aug-87 [Member] | Asset Component 1 [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	10 years
Industrial Property [Member] | Marshall, Michigan [Member] | Marshall, MI Industrial Acquired Aug-87 [Member] | Asset Component 2 [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	12 years
Industrial Property [Member] | Marshall, Michigan [Member] | Marshall, MI Industrial Acquired Aug-87 [Member] | Asset Component 3 [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	15 years
Industrial Property [Member] | Marshall, Michigan [Member] | Marshall, MI Industrial Acquired Aug-87 [Member] | Asset Component 4 [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	20 years
Industrial Property [Member] | Plymouth, Michigan [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Land and Land Estates	2,296
Buildings and Improvements	13,608
Total	15,904
Accumulated Depreciation and Amortization	4,641
Industrial Property [Member] | Plymouth, Michigan [Member] | Minimum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	30 years
Industrial Property [Member] | Plymouth, Michigan [Member] | Maximum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	40 years
Industrial Property [Member] | Temperance, Michigan [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Land and Land Estates	3,040
Buildings and Improvements	14,924
Total	17,964
Accumulated Depreciation and Amortization	3,768
Industrial Property [Member] | Temperance, Michigan [Member] | Minimum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	2 years
Industrial Property [Member] | Temperance, Michigan [Member] | Maximum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	40 years
Industrial Property [Member] | Temperance, Michigan [Member] | Asset Component 1 [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	5 years
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	6,515
Industrial Property [Member] | Olive Branch, Mississippi [Member] | Minimum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	8 years
Industrial Property [Member] | Olive Branch, Mississippi [Member] | Maximum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	40 years
Industrial Property [Member] | Olive Branch, Mississippi [Member] | Asset Component 1 [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	15 years
Industrial Property [Member] | Franklin, North Carolina [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	67
Land and Land Estates	296
Buildings and Improvements	1,320
Total	1,616
Accumulated Depreciation and Amortization	151
Industrial Property [Member] | Franklin, North Carolina [Member] | Minimum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	2 years
Industrial Property [Member] | Franklin, North Carolina [Member] | Maximum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	29 years
Industrial Property [Member] | Franklin, North Carolina [Member] | Asset Component 1 [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	8 years
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	1,953
Useful life computing depreciation in latest income statement (years)	40 years
Industrial Property [Member] | High Point, North Carolina [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Land and Land Estates	1,330
Buildings and Improvements	11,183
Total	12,513
Accumulated Depreciation and Amortization	5,192
Industrial Property [Member] | High Point, North Carolina [Member] | Minimum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	18 years
Industrial Property [Member] | High Point, North Carolina [Member] | Maximum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	40 years
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	3,101
Useful life computing depreciation in latest income statement (years)	40 years
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	4,164
Industrial Property [Member] | Statesville, North Carolina [Member] | Minimum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	3 years
Industrial Property [Member] | Statesville, North Carolina [Member] | Maximum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	40 years
Industrial Property [Member] | Statesville, North Carolina [Member] | Asset Component 1 [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	15 years
Industrial Property [Member] | Erwin, New York [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	8,311
Land and Land Estates	1,648
Buildings and Improvements	10,810
Total	12,458
Accumulated Depreciation and Amortization	951
Industrial Property [Member] | Erwin, New York [Member] | Minimum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	4 years
Industrial Property [Member] | Erwin, New York [Member] | Maximum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	34 years
Industrial Property [Member] | Erwin, New York [Member] | Asset Component 1 [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	8 years
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	4,271
Total	5,334
Accumulated Depreciation and Amortization	1,393
Useful life computing depreciation in latest income statement (years)	40 years
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	7,224
Total	8,905
Accumulated Depreciation and Amortization	2,641
Industrial Property [Member] | Hebron, Ohio [Member] | Hebron, OH Industrial, Acquired Dec-01 [Member] | Minimum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	1 year
Industrial Property [Member] | Hebron, Ohio [Member] | Hebron, OH Industrial, Acquired Dec-01 [Member] | Maximum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	40 years
Industrial Property [Member] | Hebron, Ohio [Member] | Hebron, OH Industrial, Acquired Dec-01 [Member] | Asset Component 1 [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	2 years
Industrial Property [Member] | Hebron, Ohio [Member] | Hebron, OH Industrial, Acquired Dec-01 [Member] | Asset Component 2 [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	3 years
Industrial Property [Member] | Hebron, Ohio [Member] | Hebron, OH Industrial, Acquired Dec-01 [Member] | Asset Component 3 [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	5 years
Industrial Property [Member] | Streetsboro, Ohio [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	17,910
Land and Land Estates	2,441
Buildings and Improvements	25,092
Total	27,533
Accumulated Depreciation and Amortization	6,452
Industrial Property [Member] | Streetsboro, Ohio [Member] | Minimum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	12 years
Industrial Property [Member] | Streetsboro, Ohio [Member] | Maximum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	40 years
Industrial Property [Member] | Streetsboro, Ohio [Member] | Asset Component 1 [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	20 years
Industrial Property [Member] | Streetsboro, Ohio [Member] | Asset Component 2 [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	25 years
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	1,716
Useful life computing depreciation in latest income statement (years)	40 years
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	21,177
Total	26,729
Accumulated Depreciation and Amortization	5,438
Industrial Property [Member] | Laurens, South Carolina [Member] | Minimum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	2 years
Industrial Property [Member] | Laurens, South Carolina [Member] | Maximum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	40 years
Industrial Property [Member] | Laurens, South Carolina [Member] | Asset Component 1 [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	5 years
Industrial Property [Member] | Collierville, Tennessee [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Land and Land Estates	714
Buildings and Improvements	4,783
Total	5,497
Accumulated Depreciation and Amortization	1,588
Industrial Property [Member] | Collierville, Tennessee [Member] | Minimum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	9 years
Industrial Property [Member] | Collierville, Tennessee [Member] | Maximum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	40 years
Industrial Property [Member] | Collierville, Tennessee [Member] | Asset Component 1 [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	14 years
Industrial Property [Member] | Collierville, Tennessee [Member] | Asset Component 2 [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	21 years
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	1,172
Industrial Property [Member] | Franklin, Tennessee [Member] | Minimum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	1 year
Industrial Property [Member] | Franklin, Tennessee [Member] | Maximum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	12 years
Industrial Property [Member] | Franklin, Tennessee [Member] | Asset Component 1 [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	4 years
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	9,234
Industrial Property [Member] | Millington, Tennessee [Member] | Minimum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	9 years
Industrial Property [Member] | Millington, Tennessee [Member] | Maximum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	40 years
Industrial Property [Member] | Millington, Tennessee [Member] | Asset Component 1 [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	10 years
Industrial Property [Member] | Millington, Tennessee [Member] | Asset Component 2 [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	16 years
Industrial Property [Member] | Waxahachie, Texas [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Land and Land Estates	652
Buildings and Improvements	13,045
Total	13,697
Accumulated Depreciation and Amortization	9,558
Industrial Property [Member] | Waxahachie, Texas [Member] | Minimum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	10 years
Industrial Property [Member] | Waxahachie, Texas [Member] | Maximum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	40 years
Industrial Property [Member] | Waxahachie, Texas [Member] | Asset Component 1 [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	16 years
Industrial Property [Member] | Winchester, Virginia [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	3,081
Industrial Property [Member] | Winchester, Virginia [Member] | Minimum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	4 years
Industrial Property [Member] | Winchester, Virginia [Member] | Maximum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	40 years
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	543
Industrial Property [Member] | Bingen, Washington [Member] | Minimum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	10 years
Industrial Property [Member] | Bingen, Washington [Member] | Maximum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	40 years
Industrial Property [Member] | Bingen, Washington [Member] | Asset Component 1 [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	13 years
Multi-tenanted [Member] | Phoenix, Arizona [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Land and Land Estates	1,831
Buildings and Improvements	14,892
Total	16,723
Accumulated Depreciation and Amortization	2,715
Multi-tenanted [Member] | Phoenix, Arizona [Member] | Minimum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	5 years
Multi-tenanted [Member] | Phoenix, Arizona [Member] | Maximum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	40 years
Multi-tenanted [Member] | Arlington, Texas [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Land and Land Estates	589
Buildings and Improvements	6,382
Total	6,971
Accumulated Depreciation and Amortization	663
Multi-tenanted [Member] | Arlington, Texas [Member] | Minimum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	1 year
Multi-tenanted [Member] | Arlington, Texas [Member] | Maximum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	40 years
Multi-tenanted [Member] | Arlington, Texas [Member] | Asset Component 1 [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	12 years
Multi-tenanted [Member] | Palm Beach Gardens, Florida [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Land and Land Estates	4,066
Buildings and Improvements	19,915
Total	23,981
Accumulated Depreciation and Amortization	6,331
Multi-tenanted [Member] | Palm Beach Gardens, Florida [Member] | Minimum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	5 years
Multi-tenanted [Member] | Palm Beach Gardens, Florida [Member] | Maximum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	40 years
Multi-tenanted [Member] | Florence, South Carolina [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Land and Land Estates	3,235
Buildings and Improvements	13,081
Total	16,316
Accumulated Depreciation and Amortization	4,203
Multi-tenanted [Member] | Florence, South Carolina [Member] | Minimum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	10 years
Multi-tenanted [Member] | Florence, South Carolina [Member] | Maximum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	40 years
Multi-tenanted [Member] | Florence, South Carolina [Member] | Asset Component 1 [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	20 years
Multi-tenanted [Member] | Honolulu, Hawaii [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Land and Land Estates	8,259
Buildings and Improvements	7,363
Total	15,622
Accumulated Depreciation and Amortization	1,529
Multi-tenanted [Member] | Honolulu, Hawaii [Member] | Minimum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	2 years
Multi-tenanted [Member] | Honolulu, Hawaii [Member] | Maximum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	40 years
Multi-tenanted [Member] | Honolulu, Hawaii [Member] | Asset Component 1 [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	5 years
Multi-tenanted [Member] | Baltimore, Maryland [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	55,000
Land and Land Estates	37,564
Buildings and Improvements	156,557
Total	194,121
Accumulated Depreciation and Amortization	46,609
Multi-tenanted [Member] | Baltimore, Maryland [Member] | Minimum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	5 years
Multi-tenanted [Member] | Baltimore, Maryland [Member] | Maximum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	40 years
Multi-tenanted [Member] | Bridgeton, Missouri [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Land and Land Estates	603
Buildings and Improvements	1,142
Total	1,745
Accumulated Depreciation and Amortization	0
Useful life computing depreciation in latest income statement (years)	32 years
Multi-tenanted [Member] | Bridgewater, New Jersey [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	14,118
Land and Land Estates	1,415
Buildings and Improvements	6,802
Total	8,217
Accumulated Depreciation and Amortization	225
Multi-tenanted [Member] | Bridgewater, New Jersey [Member] | Minimum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	8 years
Multi-tenanted [Member] | Bridgewater, New Jersey [Member] | Maximum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	40 years
Multi-tenanted [Member] | Bridgewater, New Jersey [Member] | Asset Component 1 [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	15 years
Multi-tenanted [Member] | Rochester, New York [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	17,257
Land and Land Estates	164
Buildings and Improvements	5,304
Total	5,468
Accumulated Depreciation and Amortization	136
Multi-tenanted [Member] | Rochester, New York [Member] | Minimum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	1 year
Multi-tenanted [Member] | Rochester, New York [Member] | Maximum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	33 years
Multi-tenanted [Member] | Rochester, New York [Member] | Asset Component 1 [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	8 years
Multi-tenanted [Member] | Rochester, New York [Member] | Asset Component 2 [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	12 years
Multi-tenanted [Member] | Rochester, New York [Member] | Asset Component 3 [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	15 years
Multi-tenanted [Member] | Canonsburg, Pennsylvania [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Land and Land Estates	1,055
Buildings and Improvements	10,910
Total	11,965
Accumulated Depreciation and Amortization	3,831
Multi-tenanted [Member] | Canonsburg, Pennsylvania [Member] | Minimum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	8 years
Multi-tenanted [Member] | Canonsburg, Pennsylvania [Member] | Maximum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	40 years
Multi-tenanted [Member] | Antioch, Tennessee [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Land and Land Estates	3,847
Buildings and Improvements	10,043
Total	13,890
Accumulated Depreciation and Amortization	1,411
Multi-tenanted [Member] | Antioch, Tennessee [Member] | Minimum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	5 years
Multi-tenanted [Member] | Antioch, Tennessee [Member] | Maximum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	40 years
Multi-tenanted [Member] | Issaquah, Washington [Member] | Issaquah, WA Multi-tenanted Acquired Jun-07 [Member] | Cross-collateralized [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	30,388
Land and Land Estates	3,052
Buildings and Improvements	5,210
Total	8,262
Accumulated Depreciation and Amortization	0
Multi-tenanted [Member] | Issaquah, Washington [Member] | Issaquah, WA Multi-tenanted Acquired Jun-07 [Member] | Cross-collateralized [Member] | Minimum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	4 years
Multi-tenanted [Member] | Issaquah, Washington [Member] | Issaquah, WA Multi-tenanted Acquired Jun-07 [Member] | Cross-collateralized [Member] | Maximum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	32 years
Multi-tenanted [Member] | Issaquah, Washington [Member] | Issaquah, WA Multi-tenanted Acquired Jun-07 [Member] | Cross-collateralized [Member] | Asset Component 1 [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	7 years
Multi-tenanted [Member] | Issaquah, Washington [Member] | Issaquah, WA Multi-tenanted Acquired Jun-07, Property 2 [Member] | Cross-collateralized [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Land and Land Estates	3,732
Buildings and Improvements	6,213
Total	9,945
Accumulated Depreciation and Amortization	0
Multi-tenanted [Member] | Issaquah, Washington [Member] | Issaquah, WA Multi-tenanted Acquired Jun-07, Property 2 [Member] | Cross-collateralized [Member] | Minimum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	7 years
Multi-tenanted [Member] | Issaquah, Washington [Member] | Issaquah, WA Multi-tenanted Acquired Jun-07, Property 2 [Member] | Cross-collateralized [Member] | Maximum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	32 years
Office Building [Member] | Phoenix, Arizona [Member] | Phoenix, AZ LTL Office Property, Acquired Dec-12 [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Land and Land Estates	5,585
Buildings and Improvements	36,099
Total	41,684
Accumulated Depreciation and Amortization	2,167
Office Building [Member] | Phoenix, Arizona [Member] | Phoenix, AZ LTL Office Property, Acquired Dec-12 [Member] | Minimum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	10 years
Office Building [Member] | Phoenix, Arizona [Member] | Phoenix, AZ LTL Office Property, Acquired Dec-12 [Member] | Maximum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	40 years
Office Building [Member] | Phoenix, Arizona [Member] | Phoenix, AZ LTL Office Property, Acquired Dec-12 [Member] | Asset Component 1 [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	17 years
Office Building [Member] | Phoenix, Arizona [Member] | Phoenix, AZ Office Property acquired May-00 [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Land and Land Estates	4,666
Buildings and Improvements	24,856
Total	29,522
Accumulated Depreciation and Amortization	8,495
Office Building [Member] | Phoenix, Arizona [Member] | Phoenix, AZ Office Property acquired May-00 [Member] | Minimum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	6 years
Office Building [Member] | Phoenix, Arizona [Member] | Phoenix, AZ Office Property acquired May-00 [Member] | Maximum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	40 years
Office Building [Member] | Phoenix, Arizona [Member] | Phoenix, AZ Office Property acquired May-00 [Member] | Asset Component 1 [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	9 years
Office Building [Member] | Tempe, Arizona [Member] | Tempe, AZ LTL Office Acquired Dec-05 [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	7,344
Land and Land Estates	0
Buildings and Improvements	9,442
Total	9,442
Accumulated Depreciation and Amortization	2,597
Office Building [Member] | Tempe, Arizona [Member] | Tempe, AZ LTL Office Acquired Dec-05 [Member] | Minimum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	30 years
Office Building [Member] | Tempe, Arizona [Member] | Tempe, AZ LTL Office Acquired Dec-05 [Member] | Maximum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	40 years
Office Building [Member] | Tempe, Arizona [Member] | Tempe, AZ Office Acquired Sep-12 [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Land and Land Estates	0
Buildings and Improvements	12,461
Total	12,461
Accumulated Depreciation and Amortization	1,015
Office Building [Member] | Tempe, Arizona [Member] | Tempe, AZ Office Acquired Sep-12 [Member] | Minimum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	5 years
Office Building [Member] | Tempe, Arizona [Member] | Tempe, AZ Office Acquired Sep-12 [Member] | Maximum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	36 years
Office Building [Member] | Tempe, Arizona [Member] | Tempe, AZ Office Acquired Sep-12 [Member] | Asset Component 1 [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	10 years
Office Building [Member] | Tempe, Arizona [Member] | Tempe, AZ Office Acquired Sep-12 [Member] | Asset Component 2 [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	11 years
Office Building [Member] | Tempe, Arizona [Member] | Tempe, AZ Office Acquired Sep-12 [Member] | Asset Component 3 [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	15 years
Office Building [Member] | Los Angeles, California [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	9,843
Land and Land Estates	5,110
Buildings and Improvements	12,158
Total	17,268
Accumulated Depreciation and Amortization	6,493
Office Building [Member] | Los Angeles, California [Member] | Minimum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	10 years
Office Building [Member] | Los Angeles, California [Member] | Maximum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	40 years
Office Building [Member] | Los Angeles, California [Member] | Asset Component 1 [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	13 years
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	1,818
Office Building [Member] | Englewood, Colorado [Member] | Minimum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	15 years
Office Building [Member] | Englewood, Colorado [Member] | Maximum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	40 years
Office Building [Member] | Englewood, Colorado [Member] | Asset Component 1 [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	19 years
Office Building [Member] | Louisville, Colorado [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Land and Land Estates	3,657
Buildings and Improvements	9,605
Total	13,262
Accumulated Depreciation and Amortization	2,574
Office Building [Member] | Louisville, Colorado [Member] | Minimum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	8 years
Office Building [Member] | Louisville, Colorado [Member] | Maximum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	40 years
Office Building [Member] | Louisville, Colorado [Member] | Asset Component 1 [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	9 years
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	278
Office Building [Member] | Parachute, Colorado [Member] | Minimum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	19 years
Office Building [Member] | Parachute, Colorado [Member] | Maximum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	40 years
Office Building [Member] | Parachute, Colorado [Member] | Asset Component 1 [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	24 years
Office Building [Member] | Orlando, Florida [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Land and Land Estates	11,498
Buildings and Improvements	66,996
Total	78,494
Accumulated Depreciation and Amortization	38,974
Office Building [Member] | Orlando, Florida [Member] | Minimum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	3 years
Office Building [Member] | Orlando, Florida [Member] | Maximum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	40 years
Office Building [Member] | Orlando, Florida [Member] | Asset Component 1 [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	5 years
Office Building [Member] | Orlando, Florida [Member] | Asset Component 2 [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	10 years
Office Building [Member] | Orlando, Florida [Member] | Asset Component 3 [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	11 years
Office Building [Member] | Orlando, Florida [Member] | Asset Component 4 [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	13 years
Office Building [Member] | Orlando, Florida [Member] | Asset Component 5 [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	25 years
Office Building [Member] | Orlando, Florida [Member] | Orlando, FL Office Acquired Jan-07 [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	9,602
Land and Land Estates	3,538
Buildings and Improvements	9,708
Total	13,246
Accumulated Depreciation and Amortization	4,681
Office Building [Member] | Orlando, Florida [Member] | Orlando, FL Office Acquired Jan-07 [Member] | Minimum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	5 years
Office Building [Member] | Orlando, Florida [Member] | Orlando, FL Office Acquired Jan-07 [Member] | Maximum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	40 years
Office Building [Member] | Orlando, Florida [Member] | Orlando, FL Office Acquired Jan-07 [Member] | Asset Component 1 [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	6 years
Office Building [Member] | Orlando, Florida [Member] | Orlando, FL Office Acquired Jan-07 [Member] | Asset Component 2 [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	12 years
Office Building [Member] | Orlando, Florida [Member] | Orlando, FL Office Acquired Jan-07 [Member] | Asset Component 3 [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	15 years
Office Building [Member] | Orlando, Florida [Member] | Orlando, FL Office Acquired Dec-06 [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Land and Land Estates	586
Buildings and Improvements	35,012
Total	35,598
Accumulated Depreciation and Amortization	7,267
Useful life computing depreciation in latest income statement (years)	40 years
Office Building [Member] | Tampa, Florida [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Land and Land Estates	2,018
Buildings and Improvements	7,950
Total	9,968
Accumulated Depreciation and Amortization	924
Office Building [Member] | Tampa, Florida [Member] | Minimum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	8 years
Office Building [Member] | Tampa, Florida [Member] | Maximum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	27 years
Office Building [Member] | Tampa, Florida [Member] | Tampa, FL LTL Office Acquired Dec-13 [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Land and Land Estates	895
Buildings and Improvements	5,496
Total	6,391
Accumulated Depreciation and Amortization	168
Office Building [Member] | Tampa, Florida [Member] | Tampa, FL LTL Office Acquired Dec-13 [Member] | Minimum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	20 years
Office Building [Member] | Tampa, Florida [Member] | Tampa, FL LTL Office Acquired Dec-13 [Member] | Maximum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	38 years
Office Building [Member] | Tampa, Florida [Member] | Tampa, FL LTL Office Acquired Dec-13, Property 2 [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Land and Land Estates	146
Buildings and Improvements	559
Total	705
Accumulated Depreciation and Amortization	19
Office Building [Member] | Tampa, Florida [Member] | Tampa, FL LTL Office Acquired Dec-13, Property 2 [Member] | Minimum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	20 years
Office Building [Member] | Tampa, Florida [Member] | Tampa, FL LTL Office Acquired Dec-13, Property 2 [Member] | Maximum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	35 years
Office Building [Member] | Tampa, Florida [Member] | Tampa, FL LTL Office Acquired Dec-13, Property 3 [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Land and Land Estates	398
Buildings and Improvements	1,571
Total	1,969
Accumulated Depreciation and Amortization	45
Office Building [Member] | Tampa, Florida [Member] | Tampa, FL LTL Office Acquired Dec-13, Property 3 [Member] | Minimum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	14 years
Office Building [Member] | Tampa, Florida [Member] | Tampa, FL LTL Office Acquired Dec-13, Property 3 [Member] | Maximum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	40 years
Office Building [Member] | Tampa, Florida [Member] | Tampa, FL LTL Office Acquired Dec-13, Property 3 [Member] | Asset Component 1 [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	20 years
Office Building [Member] | McDonough, Georgia [Member] | McDonough, GA LTL Office Acquired Sep-12 [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	11,466
Land and Land Estates	1,443
Buildings and Improvements	11,234
Total	12,677
Accumulated Depreciation and Amortization	1,046
Office Building [Member] | McDonough, Georgia [Member] | McDonough, GA LTL Office Acquired Sep-12 [Member] | Minimum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	3 years
Office Building [Member] | McDonough, Georgia [Member] | McDonough, GA LTL Office Acquired Sep-12 [Member] | Maximum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	38 years
Office Building [Member] | McDonough, Georgia [Member] | McDonough, GA LTL Office Acquired Sep-12 [Member] | Asset Component 1 [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	11 years
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	693
Buildings and Improvements	6,405
Total	7,098
Accumulated Depreciation and Amortization	601
Office Building [Member] | McDonough, Georgia [Member] | McDonough, GA Office Acquired Sep-12 [Member] | Minimum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	6 years
Office Building [Member] | McDonough, Georgia [Member] | McDonough, GA Office Acquired Sep-12 [Member] | Maximum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	40 years
Office Building [Member] | McDonough, Georgia [Member] | McDonough, GA Office Acquired Sep-12 [Member] | Asset Component 1 [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	11 years
Office Building [Member] | Lexena, Kansas [Member] | Lenexa, KS LTL Office Acquired Jul-08 [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	38,296
Land and Land Estates	6,909
Buildings and Improvements	41,693
Total	48,602
Accumulated Depreciation and Amortization	9,602
Office Building [Member] | Lexena, Kansas [Member] | Lenexa, KS LTL Office Acquired Jul-08 [Member] | Minimum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	5 years
Office Building [Member] | Lexena, Kansas [Member] | Lenexa, KS LTL Office Acquired Jul-08 [Member] | Maximum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	40 years
Office Building [Member] | Lexena, Kansas [Member] | Lenexa, KS LTL Office Acquired Jul-08 [Member] | Asset Component 1 [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	12 years
Office Building [Member] | Lexena, Kansas [Member] | Lenexa, KS LTL Office Acquired Jul-08 [Member] | Asset Component 2 [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	14 years
Office Building [Member] | Lexena, Kansas [Member] | Lenexa, KS LTL Office Acquired Jul-08 [Member] | Asset Component 3 [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	15 years
Office Building [Member] | Lexena, Kansas [Member] | Lenexa, KS Office Acquired Sep-12 [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	9,854
Land and Land Estates	2,828
Buildings and Improvements	6,075
Total	8,903
Accumulated Depreciation and Amortization	673
Office Building [Member] | Lexena, Kansas [Member] | Lenexa, KS Office Acquired Sep-12 [Member] | Minimum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	7 years
Office Building [Member] | Lexena, Kansas [Member] | Lenexa, KS Office Acquired Sep-12 [Member] | Maximum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	37 years
Office Building [Member] | Lexena, Kansas [Member] | Lenexa, KS Office Acquired Sep-12 [Member] | Asset Component 1 [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	12 years
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	1,030
Office Building [Member] | Saint Joseph, Missouri [Member] | Minimum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	15 years
Office Building [Member] | Saint Joseph, Missouri [Member] | Maximum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	40 years
Office Building [Member] | Omaha, Nebraska [Member] | Omaha, NE LTL 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	964
Office Building [Member] | Omaha, Nebraska [Member] | Omaha, NE LTL Office Acquired Dec-13 [Member] | Minimum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	20 years
Office Building [Member] | Omaha, Nebraska [Member] | Omaha, NE LTL Office Acquired Dec-13 [Member] | Maximum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	40 years
Office Building [Member] | Omaha, Nebraska [Member] | Omaha, NE LTL Office Acquired Nov-05 [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	7,776
Land and Land Estates	2,566
Buildings and Improvements	8,324
Total	10,890
Accumulated Depreciation and Amortization	2,310
Office Building [Member] | Omaha, Nebraska [Member] | Omaha, NE LTL Office Acquired Nov-05 [Member] | Minimum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	30 years
Office Building [Member] | Omaha, Nebraska [Member] | Omaha, NE LTL Office Acquired Nov-05 [Member] | Maximum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	40 years
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	20,467
Total	25,113
Accumulated Depreciation and Amortization	5,143
Office Building [Member] | Rockaway, New Jersey [Member] | Minimum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	20 years
Office Building [Member] | Rockaway, New Jersey [Member] | Maximum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	40 years
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	10,870
Useful life computing depreciation in latest income statement (years)	40 years
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	1,048
Useful life computing depreciation in latest income statement (years)	40 years
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	243
Useful life computing depreciation in latest income statement (years)	40 years
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	916
Office Building [Member] | Eugene, Oregon [Member] | Minimum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	7 years
Office Building [Member] | Eugene, Oregon [Member] | Maximum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	40 years
Office Building [Member] | Eugene, Oregon [Member] | Asset Component 1 [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	12 years
Office Building [Member] | Eugene, Oregon [Member] | Asset Component 2 [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	15 years
Office Building [Member] | Eugene, Oregon [Member] | Asset Component 3 [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	25 years
Office Building [Member] | Jessup, Pennsylvania [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Land and Land Estates	2,520
Buildings and Improvements	17,678
Total	20,198
Accumulated Depreciation and Amortization	1,691
Office Building [Member] | Jessup, Pennsylvania [Member] | Minimum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	13 years
Office Building [Member] | Jessup, Pennsylvania [Member] | Maximum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	40 years
Office Building [Member] | Jessup, Pennsylvania [Member] | Asset Component 1 [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	15 years
Office Building [Member] | Rock Hill, South Carolina [Member] | Rock Hill, SC LTL Office Acquired Mar-14 [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Land and Land Estates	1,601
Buildings and Improvements	18,989
Total	20,590
Accumulated Depreciation and Amortization	464
Office Building [Member] | Rock Hill, South Carolina [Member] | Rock Hill, SC LTL Office Acquired Mar-14 [Member] | Minimum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	18 years
Office Building [Member] | Rock Hill, South Carolina [Member] | Rock Hill, SC LTL Office Acquired Mar-14 [Member] | Maximum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	40 years
Office Building [Member] | Rock Hill, South Carolina [Member] | Rock Hill, SC LTL Office Acquired Mar-14 [Member] | Asset Component 1 [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	20 years
Office Building [Member] | Rock Hill, South Carolina [Member] | Rock Hill, SC Office Acquired May-11 [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Land and Land Estates	551
Buildings and Improvements	4,313
Total	4,864
Accumulated Depreciation and Amortization	395
Useful life computing depreciation in latest income statement (years)	40 years
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	5,441
Office Building [Member] | Allen, Texas [Member] | Minimum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	6 years
Office Building [Member] | Allen, Texas [Member] | Maximum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	25 years
Office Building [Member] | Allen, Texas [Member] | Asset Component 1 [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	7 years
Office Building [Member] | Allen, Texas [Member] | Asset Component 2 [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	11 years
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	1,452
Office Building [Member] | Arlington, Texas [Member] | Minimum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	1 year
Office Building [Member] | Arlington, Texas [Member] | Maximum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	40 years
Office Building [Member] | Arlington, Texas [Member] | Asset Component 1 [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	10 years
Office Building [Member] | Arlington, Texas [Member] | Asset Component 2 [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	12 years
Office Building [Member] | Carrollton, Texas [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Land and Land Estates	1,789
Buildings and Improvements	18,157
Total	19,946
Accumulated Depreciation and Amortization	7,861
Office Building [Member] | Carrollton, Texas [Member] | Minimum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	19 years
Office Building [Member] | Carrollton, Texas [Member] | Maximum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	40 years
Office Building [Member] | Carrollton, Texas [Member] | Carrollton, TX LTL Office Acquired Jun-07 [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	18,850
Land and Land Estates	2,599
Buildings and Improvements	22,050
Total	24,649
Accumulated Depreciation and Amortization	7,099
Office Building [Member] | Carrollton, Texas [Member] | Carrollton, TX LTL Office Acquired Jun-07 [Member] | Minimum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	8 years
Office Building [Member] | Carrollton, Texas [Member] | Carrollton, TX LTL Office Acquired Jun-07 [Member] | Maximum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	40 years
Office Building [Member] | Carrollton, Texas [Member] | Carrollton, TX LTL 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 LTL Office Acquired Dec-13 [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Land and Land Estates	481
Buildings and Improvements	2,352
Total	2,833
Accumulated Depreciation and Amortization	97
Office Building [Member] | Houston, Texas [Member] | Houston, TX LTL Office Acquired Dec-13 [Member] | Minimum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	11 years
Office Building [Member] | Houston, Texas [Member] | Houston, TX LTL Office Acquired Dec-13 [Member] | Maximum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	31 years
Office Building [Member] | Houston, Texas [Member] | Houston, TX LTL Office Acquired Dec-13 [Member] | Asset Component 1 [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	20 years
Office Building [Member] | Houston, Texas [Member] | Houston, TX LTL Office Acquired Apr-05 [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	6,148
Office Building [Member] | Houston, Texas [Member] | Houston, TX LTL Office Acquired Apr-05 [Member] | Minimum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	4 years
Office Building [Member] | Houston, Texas [Member] | Houston, TX LTL Office Acquired Apr-05 [Member] | Maximum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	40 years
Office Building [Member] | Houston, Texas [Member] | Houston, TX LTL Office Acquired Apr-05 [Member] | Asset Component 1 [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	13 years
Office Building [Member] | Houston, Texas [Member] | Houston, TX LTL Office Acquired Apr-05 [Member] | Asset Component 2 [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	20 years
Office Building [Member] | Houston, Texas [Member] | Houston, TX LTL Office Acquired Mar-04 [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	23,206
Land and Land Estates	16,613
Buildings and Improvements	58,226
Total	74,839
Accumulated Depreciation and Amortization	14,158
Office Building [Member] | Houston, Texas [Member] | Houston, TX LTL Office Acquired Mar-04 [Member] | Minimum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	10 years
Office Building [Member] | Houston, Texas [Member] | Houston, TX LTL Office Acquired Mar-04 [Member] | Maximum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	40 years
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	10,585
Total	12,460
Accumulated Depreciation and Amortization	6,110
Office Building [Member] | Houston, Texas [Member] | Houston, TX Office Acquired Apr-05 [Member] | Minimum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	5 years
Office Building [Member] | Houston, Texas [Member] | Houston, TX Office Acquired Apr-05 [Member] | Maximum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	40 years
Office Building [Member] | Houston, Texas [Member] | Houston, TX Office Acquired Apr-05 [Member] | Asset Component 1 [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	13 years
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	800
Buildings and Improvements	26,962
Total	27,762
Accumulated Depreciation and Amortization	16,694
Office Building [Member] | Houston, Texas [Member] | Houston, TX Office Acquired Apr-05, Property 2 [Member] | Minimum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	10 years
Office Building [Member] | Houston, Texas [Member] | Houston, TX Office Acquired Apr-05, Property 2 [Member] | Maximum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	40 years
Office Building [Member] | Houston, Texas [Member] | Houston, TX Office Acquired Apr-05, Property 2 [Member] | Asset Component 1 [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	11 years
Office Building [Member] | Houston, Texas [Member] | Houston, TX Office Acquired Apr-05, Property 2 [Member] | Asset Component 2 [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	20 years
Office Building [Member] | Huntington, West Virginia [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	6,500
Land and Land Estates	1,368
Buildings and Improvements	9,527
Total	10,895
Accumulated Depreciation and Amortization	946
Office Building [Member] | Huntington, West Virginia [Member] | Minimum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	14 years
Office Building [Member] | Huntington, West Virginia [Member] | Maximum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	40 years
Office Building [Member] | Little Rock, Arkansas [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Land and Land Estates	1,353
Buildings and Improvements	2,260
Total	3,613
Accumulated Depreciation and Amortization	490
Useful life computing depreciation in latest income statement (years)	40 years
Office Building [Member] | Pine Bluff, Arkansas [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Land and Land Estates	271
Buildings and Improvements	603
Total	874
Accumulated Depreciation and Amortization	162
Office Building [Member] | Pine Bluff, Arkansas [Member] | Minimum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	3 years
Office Building [Member] | Pine Bluff, Arkansas [Member] | Maximum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	13 years
Office Building [Member] | Pine Bluff, Arkansas [Member] | Asset Component 1 [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	4 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	8,260
Total	17,678
Accumulated Depreciation and Amortization	1,532
Office Building [Member] | Glendale, Arizona [Member] | Minimum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	7 years
Office Building [Member] | Glendale, Arizona [Member] | Maximum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	24 years
Office Building [Member] | Glendale, Arizona [Member] | Asset Component 1 [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	20 years
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	406
Office Building [Member] | Tucson, Arizona [Member] | Minimum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	7 years
Office Building [Member] | Tucson, Arizona [Member] | Maximum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	30 years
Office Building [Member] | Tucson, Arizona [Member] | Asset Component 1 [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	10 years
Office Building [Member] | Lake Forest, California [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Land and Land Estates	3,442
Buildings and Improvements	13,769
Total	17,211
Accumulated Depreciation and Amortization	4,403
Useful life computing depreciation in latest income statement (years)	40 years
Office Building [Member] | Palo Alto, California [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	53,536
Land and Land Estates	12,398
Buildings and Improvements	16,977
Total	29,375
Accumulated Depreciation and Amortization	18,175
Useful life computing depreciation in latest income statement (years)	40 years
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	108
Office Building [Member] | Kingsport, Tennessee [Member] | Minimum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	5 years
Office Building [Member] | Kingsport, Tennessee [Member] | Maximum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	14 years
Office Building [Member] | Kingsport, Tennessee [Member] | Asset Component 1 [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	6 years
Office Building [Member] | Centennial, Colorado [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Land and Land Estates	4,851
Buildings and Improvements	15,187
Total	20,038
Accumulated Depreciation and Amortization	5,289
Office Building [Member] | Centennial, Colorado [Member] | Minimum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	10 years
Office Building [Member] | Centennial, Colorado [Member] | Maximum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	40 years
Office Building [Member] | Lakewood, Colorado [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Land and Land Estates	1,569
Buildings and Improvements	8,857
Total	10,426
Accumulated Depreciation and Amortization	5,496
Office Building [Member] | Lakewood, Colorado [Member] | Minimum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	2 years
Office Building [Member] | Lakewood, Colorado [Member] | Maximum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	40 years
Office Building [Member] | Lakewood, Colorado [Member] | Asset Component 1 [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	3 years
Office Building [Member] | Lakewood, Colorado [Member] | Asset Component 2 [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	12 years
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	1,472
Office Building [Member] | Wallingford, Connecticut [Member] | Minimum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	8 years
Office Building [Member] | Wallingford, Connecticut [Member] | Maximum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	40 years
Office Building [Member] | Boca Raton, Florida [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	19,870
Land and Land Estates	4,290
Buildings and Improvements	17,160
Total	21,450
Accumulated Depreciation and Amortization	5,095
Useful life computing depreciation in latest income statement (years)	40 years
Office Building [Member] | Fort Meyers, Florida [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Land and Land Estates	795
Buildings and Improvements	2,941
Total	3,736
Accumulated Depreciation and Amortization	671
Office Building [Member] | Fort Meyers, Florida [Member] | Minimum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	5 years
Office Building [Member] | Fort Meyers, Florida [Member] | Maximum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	32 years
Office Building [Member] | Fort Meyers, Florida [Member] | Asset Component 1 [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	10 years
Office Building [Member] | Lake Mary, Florida [Member] | Lake Mary, FL Office Acquired Jun-07 [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Land and Land Estates	4,535
Buildings and Improvements	14,830
Total	19,365
Accumulated Depreciation and Amortization	4,809
Office Building [Member] | Lake Mary, Florida [Member] | Lake Mary, FL Office Acquired Jun-07 [Member] | Minimum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	4 years
Office Building [Member] | Lake Mary, Florida [Member] | Lake Mary, FL Office Acquired Jun-07 [Member] | Maximum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	40 years
Office Building [Member] | Lake Mary, Florida [Member] | Lake Mary, FL Office Acquired Jun-07 [Member] | Asset Component 1 [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	7 years
Office Building [Member] | Lake Mary, Florida [Member] | Lake Mary, FL Office Acquired Jun-07, Property 2 [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Land and Land Estates	4,438
Buildings and Improvements	15,103
Total	19,541
Accumulated Depreciation and Amortization	4,799
Office Building [Member] | Lake Mary, Florida [Member] | Lake Mary, FL Office Acquired Jun-07, Property 2 [Member] | Minimum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	4 years
Office Building [Member] | Lake Mary, Florida [Member] | Lake Mary, FL Office Acquired Jun-07, Property 2 [Member] | Maximum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	40 years
Office Building [Member] | Lake Mary, Florida [Member] | Lake Mary, FL Office Acquired Jun-07, Property 2 [Member] | Asset Component 1 [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	7 years
Office Building [Member] | Palm Beach Gardens, Florida [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Land and Land Estates	787
Buildings and Improvements	3,704
Total	4,491
Accumulated Depreciation and Amortization	1,282
Office Building [Member] | Palm Beach Gardens, Florida [Member] | Minimum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	5 years
Office Building [Member] | Palm Beach Gardens, Florida [Member] | Maximum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	40 years
Office Building [Member] | Clive, Iowa [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Land and Land Estates	1,158
Buildings and Improvements	0
Total	1,158
Accumulated Depreciation and Amortization	0
Office Building [Member] | Meridian, Idaho [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	9,746
Land and Land Estates	2,255
Buildings and Improvements	7,797
Total	10,052
Accumulated Depreciation and Amortization	937
Office Building [Member] | Meridian, Idaho [Member] | Minimum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	7 years
Office Building [Member] | Meridian, Idaho [Member] | Maximum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	37 years
Office Building [Member] | Lisle, Illinois [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	9,613
Land and Land Estates	3,236
Buildings and Improvements	13,747
Total	16,983
Accumulated Depreciation and Amortization	3,636
Office Building [Member] | Lisle, Illinois [Member] | Minimum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	2 years
Office Building [Member] | Lisle, Illinois [Member] | Maximum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	40 years
Office Building [Member] | Lisle, Illinois [Member] | Asset Component 1 [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	3 years
Office Building [Member] | Lisle, Illinois [Member] | Asset Component 2 [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	5 years
Office Building [Member] | Lisle, Illinois [Member] | Asset Component 3 [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	20 years
Office Building [Member] | Schaumburg, Illinois [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Land and Land Estates	5,007
Buildings and Improvements	22,086
Total	27,093
Accumulated Depreciation and Amortization	1,787
Office Building [Member] | Schaumburg, Illinois [Member] | Minimum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	7 years
Office Building [Member] | Schaumburg, Illinois [Member] | Maximum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	30 years
Office Building [Member] | Schaumburg, Illinois [Member] | Asset Component 1 [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	9 years
Office Building [Member] | Columbus, Indiana [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	25,129
Land and Land Estates	235
Buildings and Improvements	45,729
Total	45,964
Accumulated Depreciation and Amortization	10,947
Useful life computing depreciation in latest income statement (years)	40 years
Office Building [Member] | Fishers, Indiana [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Land and Land Estates	2,808
Buildings and Improvements	19,373
Total	22,181
Accumulated Depreciation and Amortization	5,337
Office Building [Member] | Fishers, Indiana [Member] | Minimum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	3 years
Office Building [Member] | Fishers, Indiana [Member] | Maximum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	40 years
Office Building [Member] | Indianapolis, Indiana [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Land and Land Estates	1,700
Buildings and Improvements	18,461
Total	20,161
Accumulated Depreciation and Amortization	12,590
Office Building [Member] | Indianapolis, Indiana [Member] | Minimum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	6 years
Office Building [Member] | Indianapolis, Indiana [Member] | Maximum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	40 years
Office Building [Member] | Overland Park, Kansas [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	34,733
Land and Land Estates	4,769
Buildings and Improvements	41,956
Total	46,725
Accumulated Depreciation and Amortization	11,583
Office Building [Member] | Overland Park, Kansas [Member] | Minimum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	12 years
Office Building [Member] | Overland Park, Kansas [Member] | Maximum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	40 years
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	3,341
Office Building [Member] | Baton Rouge, Louisiana [Member] | Minimum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	3 years
Office Building [Member] | Baton Rouge, Louisiana [Member] | Maximum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	40 years
Office Building [Member] | Baton Rouge, Louisiana [Member] | Asset Component 1 [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	4 years
Office Building [Member] | Baton Rouge, Louisiana [Member] | Asset Component 2 [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	6 years
Office Building [Member] | Boston, Massachusetts [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	12,540
Land and Land Estates	3,814
Buildings and Improvements	16,040
Total	19,854
Accumulated Depreciation and Amortization	3,157
Office Building [Member] | Boston, Massachusetts [Member] | Minimum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	10 years
Office Building [Member] | Boston, Massachusetts [Member] | Maximum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	40 years
Office Building [Member] | Foxboro, Massachusetts [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Land and Land Estates	2,231
Buildings and Improvements	25,653
Total	27,884
Accumulated Depreciation and Amortization	13,053
Office Building [Member] | Foxboro, Massachusetts [Member] | Minimum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	16 years
Office Building [Member] | Foxboro, Massachusetts [Member] | Maximum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	40 years
Office Building [Member] | Oakland, Maine [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	9,061
Land and Land Estates	551
Buildings and Improvements	8,774
Total	9,325
Accumulated Depreciation and Amortization	841
Office Building [Member] | Oakland, Maine [Member] | Minimum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	8 years
Office Building [Member] | Oakland, Maine [Member] | Maximum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	40 years
Office Building [Member] | Oakland, Maine [Member] | Asset Component 1 [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	12 years
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	1,681
Office Building [Member] | Livonia, Michigan [Member] | Minimum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	2 years
Office Building [Member] | Livonia, Michigan [Member] | Maximum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	34 years
Office Building [Member] | Southfield, Michigan [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Land and Land Estates	0
Buildings and Improvements	12,124
Total	12,124
Accumulated Depreciation and Amortization	7,223
Office Building [Member] | Southfield, Michigan [Member] | Minimum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	7 years
Office Building [Member] | Southfield, Michigan [Member] | Maximum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	40 years
Office Building [Member] | Southfield, Michigan [Member] | Asset Component 1 [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	16 years
Office Building [Member] | Kansas City, Missouri [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	16,559
Land and Land Estates	2,433
Buildings and Improvements	20,154
Total	22,587
Accumulated Depreciation and Amortization	5,546
Office Building [Member] | Kansas City, Missouri [Member] | Minimum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	12 years
Office Building [Member] | Kansas City, Missouri [Member] | Maximum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	40 years
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	447
Office Building [Member] | Pascagoula, Mississippi [Member] | Minimum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	1 year
Office Building [Member] | Pascagoula, Mississippi [Member] | Maximum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	31 years
Office Building [Member] | Pascagoula, Mississippi [Member] | Asset Component 1 [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	9 years
Office Building [Member] | Wall, New Jersey [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	19,870
Land and Land Estates	8,985
Buildings and Improvements	26,961
Total	35,946
Accumulated Depreciation and Amortization	11,518
Office Building [Member] | Wall, New Jersey [Member] | Minimum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	22 years
Office Building [Member] | Wall, New Jersey [Member] | Maximum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	40 years
Office Building [Member] | Whippany, New Jersey [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	14,153
Land and Land Estates	4,063
Buildings and Improvements	19,711
Total	23,774
Accumulated Depreciation and Amortization	6,586
Office Building [Member] | Whippany, New Jersey [Member] | Minimum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	20 years
Office Building [Member] | Whippany, New Jersey [Member] | Maximum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	40 years
Office Building [Member] | Milford, Ohio [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Land and Land Estates	3,124
Buildings and Improvements	16,140
Total	19,264
Accumulated Depreciation and Amortization	5,277
Office Building [Member] | Milford, Ohio [Member] | Minimum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	5 years
Office Building [Member] | Milford, Ohio [Member] | Maximum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	40 years
Office Building [Member] | Westerville, Ohio [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Land and Land Estates	2,085
Buildings and Improvements	9,341
Total	11,426
Accumulated Depreciation and Amortization	2,535
Office Building [Member] | Westerville, Ohio [Member] | Minimum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	5 years
Office Building [Member] | Westerville, Ohio [Member] | Maximum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	40 years
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	837
Office Building [Member] | Redmond, Oregon [Member] | Minimum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	6 years
Office Building [Member] | Redmond, Oregon [Member] | Maximum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	40 years
Office Building [Member] | Redmond, Oregon [Member] | Asset Component 1 [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	13 years
Office Building [Member] | Harrisburg, Pennsylvania [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	7,857
Land and Land Estates	900
Buildings and Improvements	10,693
Total	11,593
Accumulated Depreciation and Amortization	7,802
Office Building [Member] | Harrisburg, Pennsylvania [Member] | Minimum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	2 years
Office Building [Member] | Harrisburg, Pennsylvania [Member] | Maximum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	40 years
Office Building [Member] | Harrisburg, Pennsylvania [Member] | Asset Component 1 [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	9 years
Office Building [Member] | Harrisburg, Pennsylvania [Member] | Asset Component 2 [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	15 years
Office Building [Member] | Harrisburg, Pennsylvania [Member] | Asset Component 3 [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	20 years
Office Building [Member] | Philadelphia, Pennsylvania [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Land and Land Estates	13,209
Buildings and Improvements	56,037
Total	69,246
Accumulated Depreciation and Amortization	29,667
Office Building [Member] | Philadelphia, Pennsylvania [Member] | Minimum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	4 years
Office Building [Member] | Philadelphia, Pennsylvania [Member] | Maximum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	40 years
Office Building [Member] | Charleston, South Carolina [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	7,277
Land and Land Estates	1,189
Buildings and Improvements	8,724
Total	9,913
Accumulated Depreciation and Amortization	3,087
Useful life computing depreciation in latest income statement (years)	40 years
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	307
Office Building [Member] | Florence, South Carolina [Member] | Minimum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	12 years
Office Building [Member] | Florence, South Carolina [Member] | Maximum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	40 years
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	13,912
Office Building [Member] | Fort Mill, South Carolina [Member] | Fort Mill, SC Office, Acquired Nov-04 [Member] | Minimum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	11 years
Office Building [Member] | Fort Mill, South Carolina [Member] | Fort Mill, SC Office, Acquired Nov-04 [Member] | Maximum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	40 years
Office Building [Member] | Fort Mill, South Carolina [Member] | Fort Mill, SC Office, Acquired Nov-04 [Member] | Asset Component 1 [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	15 years
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	4,513
Office Building [Member] | Fort Mill, South Carolina [Member] | Fort Mill, SC Office, Acquired Dec-02 [Member] | Minimum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	5 years
Office Building [Member] | Fort Mill, South Carolina [Member] | Fort Mill, SC Office, Acquired Dec-02 [Member] | Maximum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	40 years
Office Building [Member] | Fort Mill, South Carolina [Member] | Fort Mill, SC Office, Acquired Dec-02 [Member] | Asset Component 1 [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	11 years
Office Building [Member] | Fort Mill, South Carolina [Member] | Fort Mill, SC Office, Acquired Dec-02 [Member] | Asset Component 2 [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	20 years
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	11,146
Total	12,225
Accumulated Depreciation and Amortization	5,630
Office Building [Member] | Knoxville, Tennessee [Member] | Knoxville, TN Office Acquired Mar-05 [Member] | Minimum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	10 years
Office Building [Member] | Knoxville, Tennessee [Member] | Knoxville, TN Office Acquired Mar-05 [Member] | Maximum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	40 years
Office Building [Member] | Knoxville, Tennessee [Member] | Knoxville, TN Office Acquired Mar-05 [Member] | Asset Component 1 [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	11 years
Office Building [Member] | Knoxville, Tennessee [Member] | Knoxville, TN Office Acquired Mar-05 [Member] | Asset Component 2 [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	14 years
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	6,282
Total	6,903
Accumulated Depreciation and Amortization	668
Office Building [Member] | Knoxville, Tennessee [Member] | Knoxville, TN Office Acquired Sep-12 [Member] | Minimum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	1 year
Office Building [Member] | Knoxville, Tennessee [Member] | Knoxville, TN Office Acquired Sep-12 [Member] | Maximum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	40 years
Office Building [Member] | Knoxville, Tennessee [Member] | Knoxville, TN Office Acquired Sep-12 [Member] | Asset Component 1 [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	5 years
Office Building [Member] | Knoxville, Tennessee [Member] | Knoxville, TN Office Acquired Sep-12 [Member] | Asset Component 2 [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	7 years
Office Building [Member] | Memphis, Tennessee [Member] | Memphis, TN Office Acquired Nov-06 [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	3,617
Land and Land Estates	464
Buildings and Improvements	4,467
Total	4,931
Accumulated Depreciation and Amortization	1,497
Office Building [Member] | Memphis, Tennessee [Member] | Memphis, TN Office Acquired Nov-06 [Member] | Minimum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	20 years
Office Building [Member] | Memphis, Tennessee [Member] | Memphis, TN Office Acquired Nov-06 [Member] | Maximum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	40 years
Office Building [Member] | Memphis, Tennessee [Member] | Memphis, TN Office Acquired Dec-06 [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	20,215
Office Building [Member] | Memphis, Tennessee [Member] | Memphis, TN Office Acquired Dec-06 [Member] | Minimum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	13 years
Office Building [Member] | Memphis, Tennessee [Member] | Memphis, TN Office Acquired Dec-06 [Member] | Maximum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	40 years
Office Building [Member] | Farmers Branch, Texas [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	18,408
Land and Land Estates	3,984
Buildings and Improvements	27,308
Total	31,292
Accumulated Depreciation and Amortization	9,006
Useful life computing depreciation in latest income statement (years)	40 years
Office Building [Member] | Garland, Texas [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Land and Land Estates	2,218
Buildings and Improvements	8,473
Total	10,691
Accumulated Depreciation and Amortization	3,060
Office Building [Member] | Garland, Texas [Member] | Minimum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	4 years
Office Building [Member] | Garland, Texas [Member] | Maximum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	18 years
Office Building [Member] | Garland, Texas [Member] | Asset Component 1 [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	5 years
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	15,558
Office Building [Member] | Irving, Texas [Member] | Irving, TX Office Acquired May-07 [Member] | Minimum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	6 years
Office Building [Member] | Irving, Texas [Member] | Irving, TX Office Acquired May-07 [Member] | Maximum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	40 years
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	29,738
Total	34,627
Accumulated Depreciation and Amortization	9,497
Office Building [Member] | Irving, Texas [Member] | Irving, TX Office Acquired Jun-07 [Member] | Minimum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	10 years
Office Building [Member] | Irving, Texas [Member] | Irving, TX Office Acquired Jun-07 [Member] | Maximum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	40 years
Office Building [Member] | Irving, Texas [Member] | Irving, TX Office Acquired Jun-07 [Member] | Asset Component 1 [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	12 years
Office Building [Member] | Mission, Texas [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	5,432
Land and Land Estates	2,556
Buildings and Improvements	2,911
Total	5,467
Accumulated Depreciation and Amortization	468
Office Building [Member] | Mission, Texas [Member] | Minimum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	3 years
Office Building [Member] | Mission, Texas [Member] | Maximum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	35 years
Office Building [Member] | Mission, Texas [Member] | Asset Component 1 [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	8 years
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	15,585
Total	18,385
Accumulated Depreciation and Amortization	10,399
Office Building [Member] | San Antonio, Texas [Member] | Minimum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	6 years
Office Building [Member] | San Antonio, Texas [Member] | Maximum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	40 years
Office Building [Member] | San Antonio, Texas [Member] | Asset Component 1 [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	11 years
Office Building [Member] | Temple, Texas [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	7,865
Land and Land Estates	227
Buildings and Improvements	8,181
Total	8,408
Accumulated Depreciation and Amortization	1,022
Office Building [Member] | Temple, Texas [Member] | Minimum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	3 years
Office Building [Member] | Temple, Texas [Member] | Maximum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	40 years
Office Building [Member] | Temple, Texas [Member] | Asset Component 1 [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	10 years
Office Building [Member] | Temple, Texas [Member] | Asset Component 2 [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	12 years
Office Building [Member] | Westlake, Texas [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Land and Land Estates	2,361
Buildings and Improvements	23,382
Total	25,743
Accumulated Depreciation and Amortization	8,322
Office Building [Member] | Westlake, Texas [Member] | Minimum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	4 years
Office Building [Member] | Westlake, Texas [Member] | Maximum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	40 years
Office Building [Member] | Hampton, Virginia [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Land and Land Estates	2,333
Buildings and Improvements	11,026
Total	13,359
Accumulated Depreciation and Amortization	4,161
Office Building [Member] | Hampton, Virginia [Member] | Minimum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	5 years
Office Building [Member] | Hampton, Virginia [Member] | Maximum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	40 years
Office Building [Member] | Hampton, Virginia [Member] | Asset Component 1 [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	10 years
Office Building [Member] | Hampton, Virginia [Member] | Asset Component 2 [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	15 years
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	24,640
Total	29,767
Accumulated Depreciation and Amortization	8,517
Office Building [Member] | Herndon, Virginia [Member] | Herndon, VA Office Acquired Dec-99 [Member] | Minimum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	9 years
Office Building [Member] | Herndon, Virginia [Member] | Herndon, VA Office Acquired Dec-99 [Member] | Maximum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	40 years
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	12,853
Total	22,262
Accumulated Depreciation and Amortization	4,542
Useful life computing depreciation in latest income statement (years)	40 years
Office Building [Member] | Midlothian, Virginia [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Land and Land Estates	1,100
Buildings and Improvements	12,685
Total	13,785
Accumulated Depreciation and Amortization	6,312
Office Building [Member] | Midlothian, Virginia [Member] | Minimum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	6 years
Office Building [Member] | Midlothian, Virginia [Member] | Maximum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	40 years
Office Building [Member] | Midlothian, Virginia [Member] | Asset Component 1 [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	7 years
Office Building [Member] | Midlothian, Virginia [Member] | Asset Component 2 [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	15 years
Office Building [Member] | Bremerton, Washington [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	5,854
Land and Land Estates	1,655
Buildings and Improvements	5,445
Total	7,100
Accumulated Depreciation and Amortization	642
Office Building [Member] | Bremerton, Washington [Member] | Minimum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	4 years
Office Building [Member] | Bremerton, Washington [Member] | Maximum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	40 years
Office Building [Member] | Bremerton, Washington [Member] | Asset Component 1 [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	13 years
Retail Site [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	185
Retail Site [Member] | Albany, Georgia [Member] | Minimum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	15 years
Retail Site [Member] | Albany, Georgia [Member] | Maximum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	40 years
Retail Site [Member] | Edmonds, Washington [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Land and Land Estates	0
Buildings and Improvements	3,947
Total	3,947
Accumulated Depreciation and Amortization	947
Useful life computing depreciation in latest income statement (years)	40 years
Retail Site [Member] | Manteca, California [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	846
Land and Land Estates	2,082
Buildings and Improvements	6,464
Total	8,546
Accumulated Depreciation and Amortization	1,499
Retail Site [Member] | Manteca, California [Member] | Minimum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	23 years
Retail Site [Member] | Manteca, California [Member] | Maximum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	40 years
Retail Site [Member] | San Diego, California [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	539
Land and Land Estates	0
Buildings and Improvements	13,310
Total	13,310
Accumulated Depreciation and Amortization	2,623
Retail Site [Member] | San Diego, California [Member] | Minimum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	23 years
Retail Site [Member] | San Diego, California [Member] | Maximum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	40 years
Retail Site [Member] | Port Richey, Florida [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Land and Land Estates	0
Buildings and Improvements	0
Total	0
Accumulated Depreciation and Amortization	0
Retail Site [Member] | Atlanta, Georgia [Member] | Atlanta, GA Retail Acquired Dec-06 [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Land and Land Estates	1,014
Buildings and Improvements	269
Total	1,283
Accumulated Depreciation and Amortization	266
Useful life computing depreciation in latest income statement (years)	40 years
Retail Site [Member] | Atlanta, Georgia [Member] | Atlanta, GA Retail Acquired Dec-06, Property 2 [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Land and Land Estates	870
Buildings and Improvements	187
Total	1,057
Accumulated Depreciation and Amortization	216
Useful life computing depreciation in latest income statement (years)	40 years
Retail Site [Member] | Chamblee, Georgia [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Land and Land Estates	770
Buildings and Improvements	186
Total	956
Accumulated Depreciation and Amortization	213
Useful life computing depreciation in latest income statement (years)	40 years
Retail Site [Member] | Cumming, Georgia [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Land and Land Estates	1,558
Buildings and Improvements	1,368
Total	2,926
Accumulated Depreciation and Amortization	593
Useful life computing depreciation in latest income statement (years)	40 years
Retail Site [Member] | Forest Park, Georgia [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Land and Land Estates	668
Buildings and Improvements	1,242
Total	1,910
Accumulated Depreciation and Amortization	399
Useful life computing depreciation in latest income statement (years)	40 years
Retail Site [Member] | Jonesboro, Georgia [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Land and Land Estates	778
Buildings and Improvements	146
Total	924
Accumulated Depreciation and Amortization	190
Useful life computing depreciation in latest income statement (years)	40 years
Retail Site [Member] | Stone Mountain, Georgia [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Land and Land Estates	672
Buildings and Improvements	276
Total	948
Accumulated Depreciation and Amortization	196
Useful life computing depreciation in latest income statement (years)	40 years
Retail Site [Member] | Galesburg, Illinois [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	475
Land and Land Estates	560
Buildings and Improvements	2,366
Total	2,926
Accumulated Depreciation and Amortization	640
Retail Site [Member] | Galesburg, Illinois [Member] | Minimum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	12 years
Retail Site [Member] | Galesburg, Illinois [Member] | Maximum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	40 years
Retail Site [Member] | Lawrence, Indiana [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Land and Land Estates	404
Buildings and Improvements	1,737
Total	2,141
Accumulated Depreciation and Amortization	356
Useful life computing depreciation in latest income statement (years)	40 years
Retail Site [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	204
Useful life computing depreciation in latest income statement (years)	40 years
Retail Site [Member] | Lexington, North Carolina [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Land and Land Estates	832
Buildings and Improvements	1,429
Total	2,261
Accumulated Depreciation and Amortization	287
Useful life computing depreciation in latest income statement (years)	40 years
Retail Site [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	56
Useful life computing depreciation in latest income statement (years)	40 years
Retail Site [Member] | Portchester, New York [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Land and Land Estates	3,841
Buildings and Improvements	5,246
Total	9,087
Accumulated Depreciation and Amortization	553
Useful life computing depreciation in latest income statement (years)	40 years
Retail Site [Member] | Watertown, New York [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	795
Land and Land Estates	386
Buildings and Improvements	5,162
Total	5,548
Accumulated Depreciation and Amortization	1,265
Retail Site [Member] | Watertown, New York [Member] | Minimum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	23 years
Retail Site [Member] | Watertown, New York [Member] | Maximum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	40 years
Retail Site [Member] | Canton, Ohio [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Land and Land Estates	884
Buildings and Improvements	3,534
Total	4,418
Accumulated Depreciation and Amortization	1,159
Useful life computing depreciation in latest income statement (years)	40 years
Retail Site [Member] | Franklin, Ohio [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Land and Land Estates	722
Buildings and Improvements	999
Total	1,721
Accumulated Depreciation and Amortization	100
Useful life computing depreciation in latest income statement (years)	40 years
Retail Site [Member] | Lorain, Ohio [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	1,197
Land and Land Estates	1,893
Buildings and Improvements	7,024
Total	8,917
Accumulated Depreciation and Amortization	1,630
Retail Site [Member] | Lorain, Ohio [Member] | Minimum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	23 years
Retail Site [Member] | Lorain, Ohio [Member] | Maximum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	40 years
Retail Site [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	392
Useful life computing depreciation in latest income statement (years)	40 years
Retail Site [Member] | Oklahoma City, Oklahoma [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Land and Land Estates	1,782
Buildings and Improvements	912
Total	2,694
Accumulated Depreciation and Amortization	313
Retail Site [Member] | Oklahoma City, Oklahoma [Member] | Minimum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	5 years
Retail Site [Member] | Oklahoma City, Oklahoma [Member] | Maximum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	13 years
Retail Site [Member] | Tulsa, Oklahoma [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Land and Land Estates	445
Buildings and Improvements	2,433
Total	2,878
Accumulated Depreciation and Amortization	2,302
Retail Site [Member] | Tulsa, Oklahoma [Member] | Minimum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	14 years
Retail Site [Member] | Tulsa, Oklahoma [Member] | Maximum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	24 years
Retail Site [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	94
Useful life computing depreciation in latest income statement (years)	40 years
Retail Site [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	160
Useful life computing depreciation in latest income statement (years)	40 years
Retail Site [Member] | Staunton, Virginia [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Land and Land Estates	1,028
Buildings and Improvements	326
Total	1,354
Accumulated Depreciation and Amortization	89
Useful life computing depreciation in latest income statement (years)	40 years
Retail Site [Member] | Fairlea, West Virginia [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	559
Land and Land Estates	501
Buildings and Improvements	1,985
Total	2,486
Accumulated Depreciation and Amortization	436
Retail Site [Member] | Fairlea, West Virginia [Member] | Minimum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	12 years
Retail Site [Member] | Fairlea, West Virginia [Member] | Maximum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	40 years
Specialty [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	101
Specialty [Member] | Vineland, New Jersey [Member] | Minimum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	3 years
Specialty [Member] | Vineland, New Jersey [Member] | Maximum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	40 years
Specialty [Member] | Vineland, New Jersey [Member] | Asset Component 1 [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	28 years
Specialty [Member] | Tomball, Texas [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	8,759
Land and Land Estates	3,174
Buildings and Improvements	7,405
Total	10,579
Accumulated Depreciation and Amortization	655
Specialty [Member] | Tomball, Texas [Member] | Minimum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	13 years
Specialty [Member] | Tomball, Texas [Member] | Maximum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	40 years
Specialty [Member] | Tomball, Texas [Member] | Asset Component 1 [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	14 years
Land [Member] | New York, New York [Member] | New York, NY LTL Land, Acquired Oct-13 [Member] | Cross-collateralized [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	213,475
Land and Land Estates	73,148
Buildings and Improvements	0
Total	73,148
Accumulated Depreciation and Amortization	0
Land [Member] | New York, New York [Member] | New York, NY LTL Land, Acquired Oct-13, Property 2 [Member] | Cross-collateralized [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Land and Land Estates	86,569
Buildings and Improvements	0
Total	86,569
Accumulated Depreciation and Amortization	0
Land [Member] | New York, New York [Member] | New York, NY LTL Land, Acquired Oct-13, Property 3 [Member] | Cross-collateralized [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Land and Land Estates	65,218
Buildings and Improvements	0
Total	65,218
Accumulated Depreciation and Amortization	0
Land [Member] | New York, New York [Member] | New York, NY LTL Land, Acquired Oct-14 [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Land and Land Estates	22,000
Buildings and Improvements	0
Total	22,000
Accumulated Depreciation and Amortization	0
Land [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
Land / Infrastructure [Member] | Houston, Texas [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	3,157
Land / Infrastructure [Member] | Houston, Texas [Member] | Minimum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	11 years
Land / Infrastructure [Member] | Houston, Texas [Member] | Maximum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	35 years
Land / Infrastructure [Member] | Houston, Texas [Member] | Asset Component 1 [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	12 years
Land / Infrastructure [Member] | Houston, Texas [Member] | Asset Component 2 [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life computing depreciation in latest income statement (years)	16 years
Land / Infrastructure [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	2,246
Useful life computing depreciation in latest income statement (years)	7 years
Construction in Progress [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Land and Land Estates	0
Buildings and Improvements	0
Total	14,946
Accumulated Depreciation and Amortization	0

Schedule_III_Real_Estate_and_A2

Schedule III - Real Estate and Accumulated Depreciation and Amortization - Summary (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
SEC Schedule III, Real Estate and Accumulated Depreciation Disclosure [Abstract]
Total cost basis for federal income tax purposes	$4,400,000,000
Reconciliation of real estate owned:
Balance at the beginning of year	3,812,294,000	3,564,466,000	3,172,246,000
Additions during year	210,143,000	492,437,000	540,847,000
Properties sold during year	-282,143,000	-212,771,000	-138,041,000
Properties impaired during the year	-65,426,000	-31,741,000	-10,553,000
Other reclassifications	-3,308,000	-97,000	-33,000
Balance at end of year	3,671,560,000	3,812,294,000	3,564,466,000
Reconciliation of accumulated depreciation and amortization:
Balance at the beginning of year	775,617,000	738,068,000	638,368,000
Depreciation and amortization expense	119,156,000	122,057,000	119,067,000
Accumulated depreciation and amortization of properties sold, impaired and held for sale during year	-98,698,000	-84,508,000	-19,367,000
Other reclassifications	-589,000	0	0
Balance at end of year	$795,486,000	$775,617,000	$738,068,000