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Debt - Schedule of Long term Debt (Details) - USD ($) $ in Thousands | 6 Months Ended |  |  |
--- | --- | --- | --- | ---
Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2014 | Aug. 31, 2014
Debt Instrument [Line Items] |  |  |  |
Term loan and credit facility | $ 0 |  | $ 470,000 |
Total | 759,405 |  | 903,985 |
Mortgages |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Fixed rate mortgage debt | 741,089 |  | 746,916 |
Floating rate mortgage debt | 0 |  | 135,146 |
Total mortgage debt | 741,089 |  | 882,062 |
Total principal | 1,626,089 |  | 1,602,062 |
Unamortized premiums, net of unamortized discount | 7,318 |  | 9,590 |
Total | 1,633,407 |  | 1,611,652 |
Mortgages | 10 Union Square |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Fixed rate mortgage debt | $ 20,466 |  | 20,641 |
Stated Rate | 6.00% |  |  |
Effective Rate | 6.71% |  |  |
Mortgages | 10 Bank Street |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Fixed rate mortgage debt | $ 32,535 |  | 32,847 |
Stated Rate | 5.72% |  |  |
Effective Rate | 6.21% |  |  |
Mortgages | 1542 Third Avenue |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Fixed rate mortgage debt | $ 18,427 |  | 18,628 |
Stated Rate | 5.90% |  |  |
Effective Rate | 6.54% |  |  |
Mortgages | First Stamford Place |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Fixed rate mortgage debt | $ 240,536 |  | 242,294 |
Stated Rate | 5.65% |  |  |
Effective Rate | 6.14% |  |  |
Mortgages | 1010 Third Avenue and 77 West 55th Street |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Fixed rate mortgage debt | $ 27,333 |  | 27,595 |
Stated Rate | 5.69% |  |  |
Effective Rate | 6.36% |  |  |
Mortgages | 383 Main Avenue |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Fixed rate mortgage debt | $ 29,565 |  | 29,852 |
Stated Rate | 5.59% |  |  |
Effective Rate | 6.00% |  |  |
Mortgages | 1333 Broadway |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Fixed rate mortgage debt | $ 69,118 |  | 69,575 |
Stated Rate | 6.32% |  |  |
Effective Rate | 3.79% |  |  |
Mortgages | 1400 Broadway - First Lien |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Fixed rate mortgage debt | $ 69,218 |  | 69,689 |
Stated Rate | 6.12% |  |  |
Effective Rate | 3.29% |  |  |
Mortgages | 1400 Broadway - Second Lien |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Fixed rate mortgage debt | $ 9,702 |  | 9,803 |
Stated Rate | 3.35% |  |  |
Effective Rate | 3.35% |  |  |
Mortgages | 112 West 34th Street - First Lien |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Fixed rate mortgage debt | $ 76,953 |  | 77,484 |
Stated Rate | 6.01% |  |  |
Effective Rate | 3.22% |  |  |
Mortgages | 112 West 34th Street - Second Lien |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Fixed rate mortgage debt | $ 9,702 |  | 9,763 |
Stated Rate | 6.56% |  |  |
Effective Rate | 3.51% |  |  |
Mortgages | 1350 Broadway - First Lien Mortgage Loan |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Fixed rate mortgage debt | $ 38,628 |  | 38,900 |
Stated Rate | 5.87% |  |  |
Effective Rate | 3.77% |  |  |
Mortgages | Metro Center |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Fixed rate mortgage debt | $ 98,906 |  | 99,845 |
Stated Rate | 3.59% |  |  |
Effective Rate | 3.67% |  |  |
Mortgages | One Grand Central Place - Third Lien | Prime Rate [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Floating rate mortgage debt | $ 0 |  | 91,000 |
Mortgages | Floating Rate Debt - 1350 Broadway - 2nd Lien Mortgage Loan |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Floating rate mortgage debt | 0 |  | 44,146 |
Mortgages | Secured Revolving Credit Facility |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Floating rate mortgage debt | 0 |  | 170,000 |
Mortgages | Secured Term Credit Facility |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Floating rate mortgage debt | 0 |  | 300,000 |
Convertible Debt | Exchangeable Senior Notes due August 15, 2019 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Fixed rate mortgage debt | $ 250,000 |  | 250,000 |
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 |  | 0 |
Stated Rate | 3.93% | 3.93% |  |
Effective Rate | 3.93% |  |  |
Senior Notes | Series B Senior Notes due 2027 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Total | $ 125,000 |  | 0 |
Stated Rate | 4.09% | 4.09% |  |
Effective Rate | 4.09% |  |  |
Senior Notes | Series C Senior Notes due 2030 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Total | $ 125,000 |  | 0 |
Stated Rate | 4.18% | 4.18% |  |
Effective Rate | 4.18% |  |  |
Revolving Credit Facility | Unsecured Revolving Credit Facility |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Term loan and credit facility | $ 285,000 |  | $ 0 |
Effective Rate | 1.34% |  |  |
Revolving Credit Facility | Unsecured Revolving Credit Facility | LIBOR [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Basis spread on variable rate | 1.15% |  |  |

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- Definition Amount of long-term debt before deduction of unamortized discount or premium. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt, with initial maturities beyond one year or the normal operating cycle, if longer. + 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 SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 20 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 9 + Details
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- Definition The amount of debt discount (net of debt premium) that was originally recognized at the issuance of the instrument that has yet to be amortized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28567-108399 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28541-108399 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=34725769&loc=d3e28878-108400 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28555-108399 + 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 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 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 SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 20, 22 -Article 5 + Details
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