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Debt - Schedule of Long term Debt (Details) - USD ($) | 6 Months Ended |  |  |  |
--- | --- | --- | --- | --- | ---
Jun. 30, 2016 | Dec. 31, 2015 | Aug. 31, 2015 | Mar. 31, 2015 | Aug. 31, 2014
Debt Instrument [Line Items] |  |  |  |  |
Unsecured revolving credit facility, net | $ 40,000,000 | $ 35,192,000 |  |  |
Deferred financing costs, net | (11,846,000) | (12,910,000) |  |  |
Total | 767,717,000 | 747,661,000 |  |  |
Mortgages |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Total mortgage debt | 758,929,000 | 735,145,000 |  |  |
Total principal | 1,663,929,000 | 1,640,145,000 |  |  |
Unamortized premiums, net of unamortized discount | 3,044,000 | 5,181,000 |  |  |
Deferred financing costs, net | (7,818,000) | (12,910,000) |  |  |
Total | 1,659,155,000 | 1,632,416,000 |  |  |
Mortgages | 10 Bank Street |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Fixed rate mortgage debt | $ 31,883,000 | 32,214,000 |  |  |
Stated Rate | 5.72% |  |  |  |
Effective Rate | 6.22% |  |  |  |
Mortgages | 1542 Third Avenue |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Fixed rate mortgage debt | $ 18,012,000 | 18,222,000 |  |  |
Stated Rate | 5.90% |  |  |  |
Effective Rate | 6.58% |  |  |  |
Mortgages | First Stamford Place |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Fixed rate mortgage debt | $ 236,942,000 | 238,765,000 |  |  |
Stated Rate | 5.65% |  |  |  |
Effective Rate | 6.15% |  |  |  |
Mortgages | 1010 Third Avenue and 77 West 55th Street |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Fixed rate mortgage debt | $ 26,787,000 | 27,064,000 |  |  |
Stated Rate | 5.69% |  |  |  |
Effective Rate | 6.38% |  |  |  |
Mortgages | 383 Main Avenue |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Fixed rate mortgage debt | $ 28,966,000 | 29,269,000 |  |  |
Stated Rate | 5.59% |  |  |  |
Effective Rate | 6.03% |  |  |  |
Mortgages | 1333 Broadway |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Fixed rate mortgage debt | $ 68,159,000 | 68,646,000 |  |  |
Stated Rate | 6.32% |  |  |  |
Effective Rate | 3.76% |  |  |  |
Mortgages | 1400 Broadway - First Lien |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Fixed rate mortgage debt | $ 68,231,000 | 68,732,000 |  |  |
Stated Rate | 6.12% |  |  |  |
Effective Rate | 3.42% |  |  |  |
Mortgages | 1400 Broadway - Second Lien |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Fixed rate mortgage debt | $ 9,495,000 | 9,600,000 |  |  |
Stated Rate | 3.35% |  |  |  |
Effective Rate | 3.35% |  |  |  |
Mortgages | 112 West 34th Street - First Lien |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Fixed rate mortgage debt | $ 75,842,000 | 76,406,000 |  |  |
Stated Rate | 6.01% |  |  |  |
Effective Rate | 3.35% |  |  |  |
Mortgages | 112 West 34th Street - Second Lien |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Fixed rate mortgage debt | $ 9,576,000 | 9,640,000 |  |  |
Stated Rate | 6.56% |  |  |  |
Effective Rate | 3.66% |  |  |  |
Mortgages | 1350 Broadway - First Lien Mortgage Loan |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Fixed rate mortgage debt | $ 38,060,000 | 38,348,000 |  |  |
Stated Rate | 5.87% |  |  |  |
Effective Rate | 3.74% |  |  |  |
Mortgages | Metro Center |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Fixed rate mortgage debt | $ 96,976,000 | 97,950,000 |  |  |
Stated Rate | 3.59% |  |  |  |
Effective Rate | 3.65% |  |  |  |
Mortgages | 10 Union Square |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Fixed rate mortgage debt | $ 50,000,000 | 20,289,000 |  |  |
Stated Rate | 3.70% |  |  |  |
Effective Rate | 4.01% |  |  |  |
Convertible Debt | Exchangeable Senior Notes due August 15, 2019 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Fixed rate mortgage debt | $ 250,000,000 | 250,000,000 |  |  |
Stated Rate | 2.625% |  |  |  | 2.625%
Effective Rate | 3.93% |  |  |  |
Senior Notes | Series A Senior Notes due 2025 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Total | $ 100,000,000 | 100,000,000 |  |  |
Stated Rate | 3.93% |  |  | 3.93% |
Effective Rate | 4.00% |  |  |  |
Senior Notes | Series B Senior Notes due 2027 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Total | $ 125,000,000 | 125,000,000 |  |  |
Stated Rate | 4.09% |  |  | 4.09% |
Effective Rate | 4.17% |  |  |  |
Senior Notes | Series C Senior Notes due 2030 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Total | $ 125,000,000 | 125,000,000 |  |  |
Stated Rate | 4.18% |  |  | 4.18% |
Effective Rate | 4.26% |  |  |  |
Revolving Credit Facility | Unsecured Revolving Credit Facility |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Unsecured revolving credit facility, net | $ 40,000,000 | 40,000,000 |  |  |
Effective Rate | 1.62% |  |  |  |
Revolving Credit Facility | Unsecured Revolving Credit Facility | LIBOR |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Basis spread on variable rate | 1.15% |  |  |  |
Revolving Credit Facility | Term Loan |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Unsecured revolving credit facility, net | $ 265,000,000.0 | $ 265,000,000 | $ 265,000,000.0 |  |
Effective Rate | 2.07% |  |  |  |
Pay Rate | 2.1485% |  |  |  |
Revolving Credit Facility | Term Loan | LIBOR |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Basis spread on variable rate | 1.60% |  |  |  |

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- Definition Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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