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Earnings Per Common Share Calculation of numerator and denominator in eps table (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified | 3 Months Ended
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Mar. 31, 2015 | Mar. 31, 2014
Numerators: |  |
Net income available for Common Shares – basic | $ 27,185us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | $ 38,099us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
Amounts allocated to dilutive securities | 2,331els_IncrementalIncomeLossRelatedToPotentialCommonShares | 3,481els_IncrementalIncomeLossRelatedToPotentialCommonShares
Net income available for Common Shares – fully diluted | $ 29,516us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted | $ 41,580us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted
Weighted average Common Shares outstanding – basic (shares) | 83,961us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 83,116us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Effect of dilutive securities: |  |
Redemption of Common OP Units for Common Shares (shares) | 7,225us-gaap_IncrementalCommonSharesAttributableToConversionOfPreferredStock | 7,635us-gaap_IncrementalCommonSharesAttributableToConversionOfPreferredStock
Stock options and restricted shares (shares) | 591us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements | 602us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements
Weighted average Common Shares outstanding – fully diluted (shares) | 91,777us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 91,353us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Earnings per Common Share – Basic: |  |
Net income available for Common Shares (usd per share) | $ 0.32us-gaap_EarningsPerShareBasic | $ 0.46us-gaap_EarningsPerShareBasic
Earnings Per Share, Diluted [Abstract] |  |
Net income available for Common Shares (usd per share) | $ 0.32us-gaap_EarningsPerShareDiluted | $ 0.46us-gaap_EarningsPerShareDiluted

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