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Capital - Earnings Per Unit (Details) (USD $) In Thousands, except Share data, unless otherwise specified | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Oct. 06, 2013 | Dec. 31, 2014 | Dec. 31, 2012
Numerator: |  |  |  |  |  |  |  |  |  |  |  |  |
Net income (loss) | $ 10,964 us-gaap_ProfitLoss | $ 22,734 us-gaap_ProfitLoss | $ 25,281 us-gaap_ProfitLoss | $ 11,231 us-gaap_ProfitLoss | $ 193,431 us-gaap_ProfitLoss | $ 148,917 us-gaap_ProfitLoss | [1] | $ 2,281 us-gaap_ProfitLoss | $ 3,071 us-gaap_ProfitLoss | $ 1,930 us-gaap_ProfitLoss | $ (37,232)us-gaap_ProfitLoss | $ 70,210 us-gaap_ProfitLoss | $ 48,643 us-gaap_ProfitLoss
Private perpetual preferred unit distributions |  |  |  |  | 0 us-gaap_PreferredStockDividendsAndOtherAdjustments |  |  |  |  |  | 0 us-gaap_PreferredStockDividendsAndOtherAdjustments | (476)us-gaap_PreferredStockDividendsAndOtherAdjustments | 0 us-gaap_PreferredStockDividendsAndOtherAdjustments
Earnings allocated to unvested shares |  |  |  |  | (804)esrt_UndistributedEarningsLossAllocatedtoParticipatingSecuritiesBasic |  |  |  |  |  |  | (482)esrt_UndistributedEarningsLossAllocatedtoParticipatingSecuritiesBasic |
Net income - basic and diluted |  |  |  |  | $ 192,627 esrt_NetIncomeLossExcludingPortionAttributabletoNoncontrollingInterestandParticipatingSecuritiesBasicandDiluted |  |  |  |  |  |  | $ 69,252 esrt_NetIncomeLossExcludingPortionAttributabletoNoncontrollingInterestandParticipatingSecuritiesBasicandDiluted |
Denominator: |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average units outstanding - basic and diluted |  |  |  |  | 244,420,000 us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted |  |  |  |  |  |  | 254,506,000 us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted |
Earnings per unit - basic and diluted | $ 0.04 us-gaap_EarningsPerShareBasic | $ 0.09 us-gaap_EarningsPerShareBasic | $ 0.10 us-gaap_EarningsPerShareBasic | $ 0.05 us-gaap_EarningsPerShareBasic | $ 0.79 us-gaap_EarningsPerShareBasic |  |  |  |  |  |  | $ 0.27 us-gaap_EarningsPerShareBasic |
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount |  |  |  |  | 500,828 us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount |  |  |  |  |  |  | 631,251 us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount |
[1] | The results of operations of our predecessor for October 1, 2013 through October 6, 2013 and the results of operations of our company for October 7, 2013 through December 31, 2013 have been combined.

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