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Investments in Real Estate and Real Estate Under Construction - Schedule of Net Real Estate (Details) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013
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Investments in Real Estate and Real Estate Under Construction [Line Items] |  |  |  |
Buildings and building improvements | $ 2,895,585 us-gaap_InvestmentBuildingAndBuildingImprovements |  | $ 3,008,709 us-gaap_InvestmentBuildingAndBuildingImprovements |
Land, land estates and land improvements | 755,168 us-gaap_LandAndLandImprovements |  | 793,418 us-gaap_LandAndLandImprovements |
Fixtures and equipment | 5,861 us-gaap_FixturesAndEquipmentGross |  | 5,861 us-gaap_FixturesAndEquipmentGross |
Construction in progress | 14,946 us-gaap_DevelopmentInProcess |  | 4,306 us-gaap_DevelopmentInProcess |
Real estate - intangible assets | 705,566 us-gaap_FiniteLivedIntangibleAssetsGross |  | 762,157 us-gaap_FiniteLivedIntangibleAssetsGross |
Investments in real estate under construction | 106,238 us-gaap_ConstructionInProgressGross |  | 74,350 us-gaap_ConstructionInProgressGross |
Real estate, gross | 4,483,364 lxp_RealEstateInvestmentPropertyFiniteLivedIntangibleAssetsAndConstructionInProgressGross |  | 4,648,801 lxp_RealEstateInvestmentPropertyFiniteLivedIntangibleAssetsAndConstructionInProgressGross |
Accumulated depreciation and amortization(1) | (1,196,114)us-gaap_RealEstateInvestmentPropertyAccumulatedDepreciation | [1] | (1,223,381)us-gaap_RealEstateInvestmentPropertyAccumulatedDepreciation | [1]
Real estate, net | 3,287,250 lxp_RealEstateInvestmentPropertyFiniteLivedIntangibleAssetsAndConstructionInProgressNet |  | 3,425,420 lxp_RealEstateInvestmentPropertyFiniteLivedIntangibleAssetsAndConstructionInProgressNet |
Accumulated amortization | 400,628 us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization |  | 447,764 us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization |
Amortization expense, next 12 months | 35,894 us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths |  |  |
Amortization expense, year 2 | 30,221 us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo |  |  |
Amortization expense, year 3 | 26,905 us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree |  |  |
Amortization expense, year 4 | 23,179 us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour |  |  |
Amortization expense, year 5 | 18,014 us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive |  |  |
Leases, Acquired-in-Place [Member] |  |  |  |
Investments in Real Estate and Real Estate Under Construction [Line Items] |  |  |  |
Real estate - intangible assets | 473,377 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_LeasesAcquiredInPlaceMember |  | 486,743 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_LeasesAcquiredInPlaceMember |
Tenant Relationships [Member] |  |  |  |
Investments in Real Estate and Real Estate Under Construction [Line Items] |  |  |  |
Real estate - intangible assets | 133,796 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = lxp_TenantRelationshipsMember |  | 172,640 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = lxp_TenantRelationshipsMember |
Above Market Leases [Member] |  |  |  |
Investments in Real Estate and Real Estate Under Construction [Line Items] |  |  |  |
Real estate - intangible assets | $ 98,393 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_AboveMarketLeasesMember |  | $ 102,774 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_AboveMarketLeasesMember |
[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.

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- Definition Amount of structure or a modification to a structure under construction. Includes recently completed structures or modifications to structures that have not been placed into service. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 + Details
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