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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%lxp_PercentOfNotesRequiredToBeRepurchasedAtOptionOfHoldersOnSetDates  
Converted instrument, amount $ 12,763,000us-gaap_DebtConversionConvertedInstrumentAmount1 $ 54,905,000us-gaap_DebtConversionConvertedInstrumentAmount1 $ 31,104,000us-gaap_DebtConversionConvertedInstrumentAmount1    
Issuance of common shares upon conversion of convertible notes (in shares) 1,904,542us-gaap_StockIssuedDuringPeriodSharesConversionOfConvertibleSecurities 7,944,673us-gaap_StockIssuedDuringPeriodSharesConversionOfConvertibleSecurities 4,487,060us-gaap_StockIssuedDuringPeriodSharesConversionOfConvertibleSecurities    
Cash payment during conversion 233,000lxp_DebtConversionConvertedInstrumentCashPaymentDuringConversion 3,270,000lxp_DebtConversionConvertedInstrumentCashPaymentDuringConversion 2,427,000lxp_DebtConversionConvertedInstrumentCashPaymentDuringConversion    
Debt satisfaction expense 2,436,000lxp_DebtConversionConvertedInstrumentDebtSatisfactionExpense 13,536,000lxp_DebtConversionConvertedInstrumentDebtSatisfactionExpense 7,842,000lxp_DebtConversionConvertedInstrumentDebtSatisfactionExpense    
Repurchase of exchangeable notes 0lxp_RepurchaseOfExchangeableNotes 0lxp_RepurchaseOfExchangeableNotes 62,150,000lxp_RepurchaseOfExchangeableNotes    
Senior Notes [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Face Amount 500,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= us-gaap_SeniorNotesMember
       
6.00% Convertible Guaranteed Note [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Face Amount 16,228,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_LongtermDebtTypeAxis
= lxp_SixPercentConvertibleGuaranteedNoteMember
28,991,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_LongtermDebtTypeAxis
= lxp_SixPercentConvertibleGuaranteedNoteMember
  115,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_LongtermDebtTypeAxis
= lxp_SixPercentConvertibleGuaranteedNoteMember
 
Debt interest rate percentage 6.00%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= lxp_SixPercentConvertibleGuaranteedNoteMember
6.00%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= lxp_SixPercentConvertibleGuaranteedNoteMember
6.00%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= lxp_SixPercentConvertibleGuaranteedNoteMember
6.00%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= lxp_SixPercentConvertibleGuaranteedNoteMember
 
Convertible debt conversion ratio 151.5965us-gaap_DebtInstrumentConvertibleConversionRatio1
/ us-gaap_LongtermDebtTypeAxis
= lxp_SixPercentConvertibleGuaranteedNoteMember
       
Convertible debt conversion price $ 6.60us-gaap_DebtInstrumentConvertibleConversionPrice1
/ us-gaap_LongtermDebtTypeAxis
= lxp_SixPercentConvertibleGuaranteedNoteMember
       
4.25% Senior Note [Member] | Senior Notes Due 2023 [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Face Amount 250,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= lxp_SeniorNotesDue2023Member
/ us-gaap_LongtermDebtTypeAxis
= lxp_FourPointTwoFivePercentSeniorNoteMember
       
Debt interest rate percentage 4.25%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= lxp_SeniorNotesDue2023Member
/ us-gaap_LongtermDebtTypeAxis
= lxp_FourPointTwoFivePercentSeniorNoteMember
       
5.45% Exchangeable Guaranteed Note [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Face Amount         450,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_LongtermDebtTypeAxis
= lxp_FivePointFourFivePercentExchangeableGuaranteedNoteMember
Debt interest rate percentage         5.45%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= lxp_FivePointFourFivePercentExchangeableGuaranteedNoteMember
Repurchase of exchangeable notes     62,150,000lxp_RepurchaseOfExchangeableNotes
/ us-gaap_LongtermDebtTypeAxis
= lxp_FivePointFourFivePercentExchangeableGuaranteedNoteMember
   
Debt satisfaction charges     44,000us-gaap_ExtinguishmentOfDebtGainLossNetOfTax
/ us-gaap_LongtermDebtTypeAxis
= lxp_FivePointFourFivePercentExchangeableGuaranteedNoteMember
   
6.804% Trust Preferred Securities [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Face Amount         200,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_LongtermDebtTypeAxis
= lxp_SixPointEightZeroFourPercentTrustPreferredSecuritiesMember
Debt interest rate percentage         6.804%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= lxp_SixPointEightZeroFourPercentTrustPreferredSecuritiesMember
Principal amount outstanding on Trust Preferred Securities $ 129,120,000us-gaap_PrincipalAmountOutstandingOnLoansSecuritized
/ us-gaap_LongtermDebtTypeAxis
= lxp_SixPointEightZeroFourPercentTrustPreferredSecuritiesMember
$ 129,120,000us-gaap_PrincipalAmountOutstandingOnLoansSecuritized
/ us-gaap_LongtermDebtTypeAxis
= lxp_SixPointEightZeroFourPercentTrustPreferredSecuritiesMember
     
Basis spread on variable rate         1.70%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_LongtermDebtTypeAxis
= lxp_SixPointEightZeroFourPercentTrustPreferredSecuritiesMember