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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 $ 500,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= us-gaap_SeniorNotesMember
4.40% Senior Note [Member] | Senior Notes Due 2024 [Member]  
Debt Instrument, Redemption [Line Items]  
Face Amount 250,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= lxp_SeniorNotesDue2024Member
/ us-gaap_LongtermDebtTypeAxis
= lxp_FourPointFourPercentSeniorNoteMember
Interest Rate 4.40%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= lxp_SeniorNotesDue2024Member
/ us-gaap_LongtermDebtTypeAxis
= lxp_FourPointFourPercentSeniorNoteMember
Issue Price 99.883%lxp_DebtInstrumentPercentageofIssuancePrice
/ us-gaap_DebtInstrumentAxis
= lxp_SeniorNotesDue2024Member
/ us-gaap_LongtermDebtTypeAxis
= lxp_FourPointFourPercentSeniorNoteMember
4.25% Senior Note [Member] | Senior Notes Due 2023 [Member]  
Debt Instrument, Redemption [Line Items]  
Face Amount $ 250,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= lxp_SeniorNotesDue2023Member
/ us-gaap_LongtermDebtTypeAxis
= lxp_FourPointTwoFivePercentSeniorNoteMember
Interest Rate 4.25%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= lxp_SeniorNotesDue2023Member
/ us-gaap_LongtermDebtTypeAxis
= lxp_FourPointTwoFivePercentSeniorNoteMember
Issue Price 99.026%lxp_DebtInstrumentPercentageofIssuancePrice
/ us-gaap_DebtInstrumentAxis
= lxp_SeniorNotesDue2023Member
/ us-gaap_LongtermDebtTypeAxis
= lxp_FourPointTwoFivePercentSeniorNoteMember