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Debt - Schedule of Long term Debt (Details) - USD ($) | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Aug. 31, 2015 | Mar. 31, 2015 | Aug. 31, 2014
Debt Instrument [Line Items] |  |  |  |  |
Unsecured revolving credit facility | $ 0 | $ 35,192,000 |  |  |
Deferred financing costs, net | (10,904,000) | (12,910,000) |  |  |
Total | 759,016,000 | 747,661,000 |  |  |
Mortgages [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Fixed rate debt | 752,840,000 | 735,145,000 |  |  |
Total principal | 1,617,840,000 | 1,640,145,000 |  |  |
Unamortized premiums, net of unamortized discount | 905,000 | 5,181,000 |  |  |
Deferred financing costs, net | (6,414,000) | (12,910,000) |  |  |
Total | 1,612,331,000 | 1,632,416,000 |  |  |
Mortgages [Member] | 10 Bank Street [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Fixed rate debt | $ 31,544,000 | 32,214,000 |  |  |
Stated Rate | 5.72% |  |  |  |
Effective Rate | 6.22% |  |  |  |
Mortgages [Member] | 1542 Third Avenue [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Fixed rate debt | $ 17,795,000 | 18,222,000 |  |  |
Stated Rate | 5.90% |  |  |  |
Effective Rate | 6.62% |  |  |  |
Mortgages [Member] | First Stamford Place [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Fixed rate debt | $ 235,067,000 | 238,765,000 |  |  |
Stated Rate | 5.65% |  |  |  |
Effective Rate | 6.18% |  |  |  |
Mortgages [Member] | 1010 Third Avenue and 77 West 55th Street [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Fixed rate debt | $ 26,502,000 | 27,064,000 |  |  |
Stated Rate | 5.69% |  |  |  |
Effective Rate | 6.39% |  |  |  |
Mortgages [Member] | 383 Main Avenue [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Fixed rate debt | $ 28,654,000 | 29,269,000 |  |  |
Stated Rate | 5.59% |  |  |  |
Effective Rate | 6.04% |  |  |  |
Mortgages [Member] | 1333 Broadway [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Fixed rate debt | $ 67,656,000 | 68,646,000 |  |  |
Stated Rate | 6.32% |  |  |  |
Effective Rate | 3.75% |  |  |  |
Mortgages [Member] | 1400 Broadway - First Lien [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Fixed rate debt | $ 67,714,000 | 68,732,000 |  |  |
Stated Rate | 6.12% |  |  |  |
Effective Rate | 3.41% |  |  |  |
Mortgages [Member] | 1400 Broadway - Second Lien [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Fixed rate debt | $ 9,389,000 | 9,600,000 |  |  |
Stated Rate | 3.35% |  |  |  |
Effective Rate | 3.36% |  |  |  |
Mortgages [Member] | 112 West 34th Street - First Lien [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Fixed rate debt | $ 75,261,000 | 76,406,000 |  |  |
Stated Rate | 6.01% |  |  |  |
Effective Rate | 3.38% |  |  |  |
Mortgages [Member] | 112 West 34th Street - Second Lien [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Fixed rate debt | $ 9,509,000 | 9,640,000 |  |  |
Stated Rate | 6.56% |  |  |  |
Effective Rate | 3.68% |  |  |  |
Mortgages [Member] | 1350 Broadway [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Fixed rate debt | $ 37,764,000 | 38,348,000 |  |  |
Stated Rate | 5.87% |  |  |  |
Effective Rate | 3.74% |  |  |  |
Mortgages [Member] | Metro Center [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Fixed rate debt | $ 95,985,000 | 97,950,000 |  |  |
Stated Rate | 3.59% |  |  |  |
Effective Rate | 3.67% |  |  |  |
Mortgages [Member] | 10 Union Square [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Fixed rate debt | $ 50,000,000 | 20,289,000 |  |  |
Stated Rate | 3.70% |  |  |  |
Effective Rate | 3.99% |  |  |  |
Convertible Debt [Member] | Exchangeable Senior Notes due August 15, 2019 [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Fixed rate debt | $ 250,000,000 | 250,000,000 |  |  |
Stated Rate | 2.625% |  |  |  | 2.625%
Effective Rate | 3.93% |  |  |  | 3.80%
Senior Notes [Member] | Series A Senior Notes due 2025 [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Total | $ 100,000,000 | 100,000,000 |  |  |
Stated Rate | 3.93% |  |  | 3.93% |
Effective Rate | 4.03% |  |  |  |
Senior Notes [Member] | Series B Senior Notes due 2027 [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Total | $ 125,000,000 | 125,000,000 |  |  |
Stated Rate | 4.09% |  |  | 4.09% |
Effective Rate | 4.19% |  |  |  |
Senior Notes [Member] | Series C Senior Notes due 2030 [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Total | $ 125,000,000 | 125,000,000 |  |  |
Stated Rate | 4.18% |  |  | 4.18% |
Effective Rate | 4.28% |  |  |  |
Revolving credit facility [Member] | Unsecured revolving credit facility [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Unsecured revolving credit facility | $ 0 | 40,000,000 |  |  |
Effective Rate | 1.92% |  |  |  |
Revolving credit facility [Member] | Unsecured revolving credit facility [Member] | LIBOR [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Basis spread on variable rate | 1.15% |  |  |  |
Revolving credit facility [Member] | Unsecured Term Loan Facility [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Unsecured revolving credit facility | $ 265,000,000 | $ 265,000,000 | $ 265,000,000.0 |  |
Effective Rate | 2.37% |  |  |  |
Pay rate | 2.1485% |  |  |  |
Revolving credit facility [Member] | Unsecured Term Loan Facility [Member] | LIBOR [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Basis spread on variable rate | 1.60% |  |  |  |

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