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Debt - Mortgage Debt (Details) - USD ($) | 1 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Jan. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Jun. 30, 2017 | May 31, 2017 | Apr. 30, 2017
Debt Instrument [Line Items] |  |  |  |  |  |  |
Repayment of mortgage notes payable |  | $ 346,615,000 | $ 32,305,000 | $ 146,918,000 |  |  |
Mortgages [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Fixed rate debt |  | $ 721,224,000 | 752,840,000 |  |  |  |
Mortgages [Member] | 1542 Third Avenue [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Face amount |  |  |  |  |  |  | $ 30,000,000.0
Stated interest rate |  | 4.29% |  |  |  |  | 4.29%
Fixed rate debt |  | $ 30,000,000 | 17,795,000 |  |  |  |
Mortgages [Member] | 10 Bank Street [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Face amount |  |  |  |  |  | $ 35,000,000.0 |
Stated interest rate |  | 4.23% |  |  |  | 4.23% |
Fixed rate debt |  | $ 34,602,000 | 31,544,000 |  |  |  |
Mortgages [Member] | First Stamford Place [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Face amount |  |  |  |  | $ 180,000,000.0 |  |
Stated interest rate |  | 4.28% |  |  | 4.28% |  |
Fixed rate debt |  | $ 180,000,000 | 235,067,000 |  |  |  |
Mortgages [Member] | First Stamford Place - First Lien [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Face amount |  | $ 164,000,000 |  |  | $ 164,000,000.0 |  |
Stated interest rate |  | 4.09% |  |  | 4.09% |  |
Mortgages [Member] | First Stamford Place - Second Lien [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Face amount |  | $ 16,000,000 |  |  | $ 16,000,000.0 |  |
Stated interest rate |  | 6.25% |  |  | 6.25% |  |
Mortgages [Member] | 1010 Third Avenue and 77 West 55th Street [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Face amount |  |  |  |  | $ 40,000,000.0 |  |
Stated interest rate |  | 4.01% |  |  | 4.01% |  |
Fixed rate debt |  | $ 39,710,000 | 26,502,000 |  |  |  |
Mortgages [Member] | 383 Main Avenue [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Face amount |  |  |  |  | $ 30,000,000.0 |  |
Stated interest rate |  | 4.44% |  |  | 4.44% |  |
Fixed rate debt |  | $ 30,000,000 | 28,654,000 |  |  |  |
Mortgages [Member] | 1333 Broadway [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Stated interest rate |  | 6.32% |  |  |  |  |
Fixed rate debt |  | $ 66,602,000 | $ 67,656,000 |  |  |  |
Subsequent Event [Member] | Mortgages [Member] | 1333 Broadway [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Face amount | $ 160,000,000 |  |  |  |  |  |
Stated interest rate | 4.21% |  |  |  |  |  |
Subsequent Event [Member] | Mortgages [Member] | 1400 Broadway [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Repayment of mortgage notes payable | $ 75,800,000 |  |  |  |  |  |

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