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Condensed Consolidated Statements of Capital
shares in Thousands, $ in Thousands
 3 Months Ended
Mar. 31, 2017
USD ($)
shares
Increase (Decrease) in Partners' Capital [Roll Forward]  
Beginning balance $ 1,982,863
Equity compensation 3,154
Distributions (31,630)
Net income 19,145
Unrealized gain on valuation of interest rate swap agreements 1,394
Ending balance $ 1,974,926
General Partner | Series PR operating partnership units  
Increase (Decrease) in Partners' Capital [Roll Forward]  
Beginning balance (in units) | shares 155,841
Beginning balance $ 1,154,136
Conversion of operating partnership units to ESRT Partner's Capital (in units) | shares 1,915
Conversion of operating partnership units to ESRT Partner's Capital $ 7,809
Equity compensation (in units) | shares 28
Equity compensation $ 89
Distributions (16,482)
Net income 9,985
Unrealized gain on valuation of interest rate swap agreements $ 736
Ending balance (in units) | shares 157,784
Ending balance $ 1,156,273
Limited Partner | Series PR operating partnership units  
Increase (Decrease) in Partners' Capital [Roll Forward]  
Beginning balance (in units) | shares 93,075
Beginning balance $ 793,360
Conversion of operating partnership units to ESRT Partner's Capital (in units) | shares (851)
Conversion of operating partnership units to ESRT Partner's Capital $ (7,247)
Equity compensation (in units) | shares 1,245
Equity compensation $ 3,065
Distributions (9,728)
Net income 5,749
Unrealized gain on valuation of interest rate swap agreements $ 424
Ending balance (in units) | shares 93,469
Ending balance $ 785,623
Limited Partner | Series ES operating partnership units  
Increase (Decrease) in Partners' Capital [Roll Forward]  
Beginning balance (in units) | shares 35,728
Beginning balance $ 20,091
Conversion of operating partnership units to ESRT Partner's Capital (in units) | shares (667)
Conversion of operating partnership units to ESRT Partner's Capital $ (368)
Distributions (3,694)
Net income 2,269
Unrealized gain on valuation of interest rate swap agreements $ 167
Ending balance (in units) | shares 35,061
Ending balance $ 18,465
Limited Partner | Series 60 operating partnership units  
Increase (Decrease) in Partners' Capital [Roll Forward]  
Beginning balance (in units) | shares 9,701
Beginning balance $ 4,880
Conversion of operating partnership units to ESRT Partner's Capital (in units) | shares (245)
Conversion of operating partnership units to ESRT Partner's Capital $ (120)
Distributions (1,002)
Net income 605
Unrealized gain on valuation of interest rate swap agreements $ 45
Ending balance (in units) | shares 9,456
Ending balance $ 4,408
Limited Partner | Series 250 operating partnership units  
Increase (Decrease) in Partners' Capital [Roll Forward]  
Beginning balance (in units) | shares 4,747
Beginning balance $ 2,392
Conversion of operating partnership units to ESRT Partner's Capital (in units) | shares (152)
Conversion of operating partnership units to ESRT Partner's Capital $ (74)
Distributions (490)
Net income 303
Unrealized gain on valuation of interest rate swap agreements $ 22
Ending balance (in units) | shares 4,595
Ending balance $ 2,153
Private Perpetual Preferred Units  
Increase (Decrease) in Partners' Capital [Roll Forward]  
Beginning balance (in units) | shares 1,560
Beginning balance $ 8,004
Distributions (234)
Net income $ 234
Ending balance (in units) | shares 1,560
Ending balance $ 8,004