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Income Taxes - Summary of Average Taxable Nature of Dividends (Details) (USD $) | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Common [Member] |  |  |
Income Tax Contingency [Line Items] |  |  |
Total dividends per share, common | $ 0.67 us-gaap_CommonStockDividendsPerShareDeclared / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember | $ 0.6 us-gaap_CommonStockDividendsPerShareDeclared / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember | $ 0.525 us-gaap_CommonStockDividendsPerShareDeclared / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember
Taxable percentage allocation on dividends | 100.00%lxp_TaxablePercentageAllocationOnDividends / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember | 100.00%lxp_TaxablePercentageAllocationOnDividends / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember | 100.00%lxp_TaxablePercentageAllocationOnDividends / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember
Common [Member] | Ordinary Income [Member] |  |  |
Income Tax Contingency [Line Items] |  |  |
Taxable percentage allocation on dividends | 49.44%lxp_TaxablePercentageAllocationOnDividends / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember / lxp_TaxOnDividendsByNatureAxis = lxp_OrdinaryIncomeMember | 35.53%lxp_TaxablePercentageAllocationOnDividends / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember / lxp_TaxOnDividendsByNatureAxis = lxp_OrdinaryIncomeMember | 95.68%lxp_TaxablePercentageAllocationOnDividends / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember / lxp_TaxOnDividendsByNatureAxis = lxp_OrdinaryIncomeMember
Common [Member] | Fifteen Percent Rate, Qualifying Dividend [Member] |  |  |
Income Tax Contingency [Line Items] |  |  |
Taxable percentage allocation on dividends | 0.05%lxp_TaxablePercentageAllocationOnDividends / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember / lxp_TaxOnDividendsByNatureAxis = lxp_FifteenPercentRateQualifyingDividendMember | 4.11%lxp_TaxablePercentageAllocationOnDividends / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember / lxp_TaxOnDividendsByNatureAxis = lxp_FifteenPercentRateQualifyingDividendMember | 0.99%lxp_TaxablePercentageAllocationOnDividends / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember / lxp_TaxOnDividendsByNatureAxis = lxp_FifteenPercentRateQualifyingDividendMember
Common [Member] | Fifteen Percent Rate Gain [Member] |  |  |
Income Tax Contingency [Line Items] |  |  |
Taxable percentage allocation on dividends | 0.00%lxp_TaxablePercentageAllocationOnDividends / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember / lxp_TaxOnDividendsByNatureAxis = lxp_FifteenPercentRateGainMember | 2.09%lxp_TaxablePercentageAllocationOnDividends / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember / lxp_TaxOnDividendsByNatureAxis = lxp_FifteenPercentRateGainMember | 0.00%lxp_TaxablePercentageAllocationOnDividends / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember / lxp_TaxOnDividendsByNatureAxis = lxp_FifteenPercentRateGainMember
Common [Member] | Return of Capital [Member] |  |  |
Income Tax Contingency [Line Items] |  |  |
Taxable percentage allocation on dividends | 50.51%lxp_TaxablePercentageAllocationOnDividends / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember / lxp_TaxOnDividendsByNatureAxis = lxp_ReturnOfCapitalMember | 58.27%lxp_TaxablePercentageAllocationOnDividends / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember / lxp_TaxOnDividendsByNatureAxis = lxp_ReturnOfCapitalMember | 3.33%lxp_TaxablePercentageAllocationOnDividends / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember / lxp_TaxOnDividendsByNatureAxis = lxp_ReturnOfCapitalMember
Series B Cumulative Redeemable Preferred Shares [Member] |  |  |
Income Tax Contingency [Line Items] |  |  |
Total dividends per share, preferred | $ 0 us-gaap_PreferredStockDividendsPerShareDeclared / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember | $ 0 us-gaap_PreferredStockDividendsPerShareDeclared / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember | $ 1.341667 us-gaap_PreferredStockDividendsPerShareDeclared / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember
Taxable percentage allocation on dividends | 0.00%lxp_TaxablePercentageAllocationOnDividends / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember | 0.00%lxp_TaxablePercentageAllocationOnDividends / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember | 100.00%lxp_TaxablePercentageAllocationOnDividends / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember
Series B Cumulative Redeemable Preferred Shares [Member] | Ordinary Income [Member] |  |  |
Income Tax Contingency [Line Items] |  |  |
Taxable percentage allocation on dividends | 0.00%lxp_TaxablePercentageAllocationOnDividends / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember / lxp_TaxOnDividendsByNatureAxis = lxp_OrdinaryIncomeMember | 0.00%lxp_TaxablePercentageAllocationOnDividends / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember / lxp_TaxOnDividendsByNatureAxis = lxp_OrdinaryIncomeMember | 98.98%lxp_TaxablePercentageAllocationOnDividends / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember / lxp_TaxOnDividendsByNatureAxis = lxp_OrdinaryIncomeMember
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%lxp_TaxablePercentageAllocationOnDividends / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember / lxp_TaxOnDividendsByNatureAxis = lxp_FifteenPercentRateQualifyingDividendMember | 0.00%lxp_TaxablePercentageAllocationOnDividends / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember / lxp_TaxOnDividendsByNatureAxis = lxp_FifteenPercentRateQualifyingDividendMember | 1.02%lxp_TaxablePercentageAllocationOnDividends / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember / lxp_TaxOnDividendsByNatureAxis = lxp_FifteenPercentRateQualifyingDividendMember
Series B Cumulative Redeemable Preferred Shares [Member] | Fifteen Percent Rate Gain [Member] |  |  |
Income Tax Contingency [Line Items] |  |  |
Taxable percentage allocation on dividends | 0.00%lxp_TaxablePercentageAllocationOnDividends / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember / lxp_TaxOnDividendsByNatureAxis = lxp_FifteenPercentRateGainMember | 0.00%lxp_TaxablePercentageAllocationOnDividends / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember / lxp_TaxOnDividendsByNatureAxis = lxp_FifteenPercentRateGainMember | 0.00%lxp_TaxablePercentageAllocationOnDividends / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember / lxp_TaxOnDividendsByNatureAxis = lxp_FifteenPercentRateGainMember
Series B Cumulative Redeemable Preferred Shares [Member] | Return of Capital [Member] |  |  |
Income Tax Contingency [Line Items] |  |  |
Taxable percentage allocation on dividends | 0.00%lxp_TaxablePercentageAllocationOnDividends / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember / lxp_TaxOnDividendsByNatureAxis = lxp_ReturnOfCapitalMember | 0.00%lxp_TaxablePercentageAllocationOnDividends / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember / lxp_TaxOnDividendsByNatureAxis = lxp_ReturnOfCapitalMember | 0.00%lxp_TaxablePercentageAllocationOnDividends / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember / lxp_TaxOnDividendsByNatureAxis = lxp_ReturnOfCapitalMember
Series C Cumulative Redeemable Preferred Shares [Member] |  |  |
Income Tax Contingency [Line Items] |  |  |
Total dividends per share, preferred | $ 3.25 us-gaap_PreferredStockDividendsPerShareDeclared / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesCPreferredStockMember | $ 3.25 us-gaap_PreferredStockDividendsPerShareDeclared / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesCPreferredStockMember | $ 3.25 us-gaap_PreferredStockDividendsPerShareDeclared / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesCPreferredStockMember
Taxable percentage allocation on dividends | 100.00%lxp_TaxablePercentageAllocationOnDividends / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesCPreferredStockMember | 100.00%lxp_TaxablePercentageAllocationOnDividends / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesCPreferredStockMember | 100.00%lxp_TaxablePercentageAllocationOnDividends / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesCPreferredStockMember
Series C Cumulative Redeemable Preferred Shares [Member] | Ordinary Income [Member] |  |  |
Income Tax Contingency [Line Items] |  |  |
Taxable percentage allocation on dividends | 99.90%lxp_TaxablePercentageAllocationOnDividends / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesCPreferredStockMember / lxp_TaxOnDividendsByNatureAxis = lxp_OrdinaryIncomeMember | 85.14%lxp_TaxablePercentageAllocationOnDividends / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesCPreferredStockMember / lxp_TaxOnDividendsByNatureAxis = lxp_OrdinaryIncomeMember | 98.98%lxp_TaxablePercentageAllocationOnDividends / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesCPreferredStockMember / lxp_TaxOnDividendsByNatureAxis = lxp_OrdinaryIncomeMember
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%lxp_TaxablePercentageAllocationOnDividends / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesCPreferredStockMember / lxp_TaxOnDividendsByNatureAxis = lxp_FifteenPercentRateQualifyingDividendMember | 9.85%lxp_TaxablePercentageAllocationOnDividends / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesCPreferredStockMember / lxp_TaxOnDividendsByNatureAxis = lxp_FifteenPercentRateQualifyingDividendMember | 1.02%lxp_TaxablePercentageAllocationOnDividends / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesCPreferredStockMember / lxp_TaxOnDividendsByNatureAxis = lxp_FifteenPercentRateQualifyingDividendMember
Series C Cumulative Redeemable Preferred Shares [Member] | Fifteen Percent Rate Gain [Member] |  |  |
Income Tax Contingency [Line Items] |  |  |
Taxable percentage allocation on dividends | 0.00%lxp_TaxablePercentageAllocationOnDividends / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesCPreferredStockMember / lxp_TaxOnDividendsByNatureAxis = lxp_FifteenPercentRateGainMember | 5.01%lxp_TaxablePercentageAllocationOnDividends / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesCPreferredStockMember / lxp_TaxOnDividendsByNatureAxis = lxp_FifteenPercentRateGainMember | 0.00%lxp_TaxablePercentageAllocationOnDividends / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesCPreferredStockMember / lxp_TaxOnDividendsByNatureAxis = lxp_FifteenPercentRateGainMember
Series C Cumulative Redeemable Preferred Shares [Member] | Return of Capital [Member] |  |  |
Income Tax Contingency [Line Items] |  |  |
Taxable percentage allocation on dividends | 0.00%lxp_TaxablePercentageAllocationOnDividends / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesCPreferredStockMember / lxp_TaxOnDividendsByNatureAxis = lxp_ReturnOfCapitalMember | 0.00%lxp_TaxablePercentageAllocationOnDividends / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesCPreferredStockMember / lxp_TaxOnDividendsByNatureAxis = lxp_ReturnOfCapitalMember | 0.00%lxp_TaxablePercentageAllocationOnDividends / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesCPreferredStockMember / lxp_TaxOnDividendsByNatureAxis = lxp_ReturnOfCapitalMember
Series D Cumulative Redeemable Preferred Shares [Member] |  |  |
Income Tax Contingency [Line Items] |  |  |
Total dividends per share, preferred | $ 0 us-gaap_PreferredStockDividendsPerShareDeclared / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesDPreferredStockMember | $ 1.043368 us-gaap_PreferredStockDividendsPerShareDeclared / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesDPreferredStockMember | $ 1.8875 us-gaap_PreferredStockDividendsPerShareDeclared / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesDPreferredStockMember
Taxable percentage allocation on dividends | 0.00%lxp_TaxablePercentageAllocationOnDividends / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesDPreferredStockMember | 100.00%lxp_TaxablePercentageAllocationOnDividends / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesDPreferredStockMember | 100.00%lxp_TaxablePercentageAllocationOnDividends / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesDPreferredStockMember
Series D Cumulative Redeemable Preferred Shares [Member] | Ordinary Income [Member] |  |  |
Income Tax Contingency [Line Items] |  |  |
Taxable percentage allocation on dividends | 0.00%lxp_TaxablePercentageAllocationOnDividends / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesDPreferredStockMember / lxp_TaxOnDividendsByNatureAxis = lxp_OrdinaryIncomeMember | 85.14%lxp_TaxablePercentageAllocationOnDividends / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesDPreferredStockMember / lxp_TaxOnDividendsByNatureAxis = lxp_OrdinaryIncomeMember | 98.98%lxp_TaxablePercentageAllocationOnDividends / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesDPreferredStockMember / lxp_TaxOnDividendsByNatureAxis = lxp_OrdinaryIncomeMember
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%lxp_TaxablePercentageAllocationOnDividends / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesDPreferredStockMember / lxp_TaxOnDividendsByNatureAxis = lxp_FifteenPercentRateQualifyingDividendMember | 9.85%lxp_TaxablePercentageAllocationOnDividends / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesDPreferredStockMember / lxp_TaxOnDividendsByNatureAxis = lxp_FifteenPercentRateQualifyingDividendMember | 1.02%lxp_TaxablePercentageAllocationOnDividends / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesDPreferredStockMember / lxp_TaxOnDividendsByNatureAxis = lxp_FifteenPercentRateQualifyingDividendMember
Series D Cumulative Redeemable Preferred Shares [Member] | Fifteen Percent Rate Gain [Member] |  |  |
Income Tax Contingency [Line Items] |  |  |
Taxable percentage allocation on dividends | 0.00%lxp_TaxablePercentageAllocationOnDividends / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesDPreferredStockMember / lxp_TaxOnDividendsByNatureAxis = lxp_FifteenPercentRateGainMember | 5.01%lxp_TaxablePercentageAllocationOnDividends / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesDPreferredStockMember / lxp_TaxOnDividendsByNatureAxis = lxp_FifteenPercentRateGainMember | 0.00%lxp_TaxablePercentageAllocationOnDividends / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesDPreferredStockMember / lxp_TaxOnDividendsByNatureAxis = lxp_FifteenPercentRateGainMember
Series D Cumulative Redeemable Preferred Shares [Member] | Return of Capital [Member] |  |  |
Income Tax Contingency [Line Items] |  |  |
Taxable percentage allocation on dividends | 0.00%lxp_TaxablePercentageAllocationOnDividends / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesDPreferredStockMember / lxp_TaxOnDividendsByNatureAxis = lxp_ReturnOfCapitalMember | 0.00%lxp_TaxablePercentageAllocationOnDividends / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesDPreferredStockMember / lxp_TaxOnDividendsByNatureAxis = lxp_ReturnOfCapitalMember | 0.00%lxp_TaxablePercentageAllocationOnDividends / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesDPreferredStockMember / lxp_TaxOnDividendsByNatureAxis = lxp_ReturnOfCapitalMember

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- Definition Aggregate dividends declared during the period for each share of common stock outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 + Details
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