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Debt Schedule of Long term Debt (Details) (USD $) In Thousands, unless otherwise specified | 9 Months Ended |
--- | --- | ---
Sep. 30, 2014 | Dec. 31, 2013
Debt Instrument [Line Items] |  |  |  |
Total | $ 1,005,569 |  | $ 883,112 |
250 West 57th Street - Third lien [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt Instrument, Option to Fix the Interest Rate on Portion of Principal Balance | 3 |  |  |
Mortgages [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Fixed rate mortgage debt | 940,835 |  | 824,088 |
Floating rate mortgage debt | 41,059 |  | 47,331 |
Total mortgage debt | 981,894 |  | 871,419 |
Long-term Debt, Gross | 1,587,494 |  | 1,196,419 |
Unamortized Discount (Premium) | 10,674 |  | 11,693 |
Total | 1,598,168 |  | 1,208,112 |
Mortgages [Member] | 501 Seventh Avenue [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Fixed rate mortgage debt | 0 | [1] | 0 | [1]
Mortgages [Member] | 501 Seventh Avenue - Note 1 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Fixed rate mortgage debt | 0 | [1] | 1,037 | [1]
Mortgages [Member] | 501 Seventh Avenue - Note 2 - Tranche 1 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Fixed rate mortgage debt | 0 | [1] | 31,459 | [1]
Mortgages [Member] | 501 Seventh Avenue - Note 2 - Tranche 2 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Fixed rate mortgage debt | 0 | [1] | 6,889 | [1]
Mortgages [Member] | 1359 Broadway [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Fixed rate mortgage debt | 44,146 | [1] | 0 | [1]
Stated Rate | 6.04% | [1] |  |
Effective Rate | 6.56% | [1],[2] |  |
Mortgages [Member] | 1359 Broadway - First Lien [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Fixed rate mortgage debt | 0 | [1] | 9,579 | [1]
Mortgages [Member] | 1359 Broadway - Second Lien - Tranche 1 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Fixed rate mortgage debt | 0 | [1] | 5,561 | [1]
Mortgages [Member] | 1359 Broadway - Second Lien - Tranche 2 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Fixed rate mortgage debt | 0 | [1] | 11,311 | [1]
Mortgages [Member] | 1359 Broadway - Second Lien - Tranche 3 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Fixed rate mortgage debt | 0 | [1] | 18,572 | [1]
Mortgages [Member] | One Grand Central Place - First Lien [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Fixed rate mortgage debt | 69,994 |  | 71,723 |
Stated Rate | 5.34% |  |  |
Effective Rate | 6.85% | [2] |  |
Mortgages [Member] | One Grand Central Place - Second Lien [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Fixed rate mortgage debt | 14,642 |  | 14,884 |
Stated Rate | 7.00% |  |  |
Effective Rate | 8.51% | [2] |  |
Mortgages [Member] | 500 Mamaroneck Avenue [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Fixed rate mortgage debt | 32,076 |  | 32,620 |
Stated Rate | 5.41% |  |  |
Effective Rate | 6.47% | [2] |  |
Mortgages [Member] | 250 West 57th Street - First Lien [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Fixed rate mortgage debt | 24,976 |  | 25,621 |
Stated Rate | 5.33% |  |  |
Effective Rate | 6.46% | [2] |  |
Mortgages [Member] | 250 West 57th Street - Second Lien [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Fixed rate mortgage debt | 11,036 |  | 11,252 |
Stated Rate | 6.13% |  |  |
Effective Rate | 7.26% | [2] |  |
Mortgages [Member] | Metro Center [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Fixed rate mortgage debt | 94,501 |  | 96,158 |
Stated Rate | 5.89% |  |  |
Effective Rate | 6.76% | [2] |  |
Mortgages [Member] | 10 Union Square [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Fixed rate mortgage debt | 20,726 |  | 20,972 |
Stated Rate | 6.00% |  |  |
Effective Rate | 6.76% | [2] |  |
Mortgages [Member] | 10 Bank Street [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Fixed rate mortgage debt | 32,999 |  | 33,444 |
Stated Rate | 5.72% |  |  |
Effective Rate | 6.21% | [2] |  |
Mortgages [Member] | 1542 Third Avenue [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Fixed rate mortgage debt | 18,727 |  | 19,011 |
Stated Rate | 5.90% |  |  |
Effective Rate | 6.58% | [2] |  |
Mortgages [Member] | First Stamford Place [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Fixed rate mortgage debt | 243,156 |  | 245,629 |
Stated Rate | 5.65% |  |  |
Effective Rate | 6.17% | [2] |  |
Mortgages [Member] | 1010 Third Avenue and 77 West 55th Street [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Fixed rate mortgage debt | 27,723 |  | 28,096 |
Stated Rate | 5.69% |  |  |
Effective Rate | 6.14% | [2] |  |
Mortgages [Member] | 383 Main Avenue [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Fixed rate mortgage debt | 29,993 |  | 30,403 |
Stated Rate | 5.59% |  |  |
Effective Rate | 6.10% | [2] |  |
Mortgages [Member] | 1333 Broadway [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Fixed rate mortgage debt | 69,798 |  | 70,447 |
Stated Rate | 6.32% |  |  |
Effective Rate | 3.82% | [2] |  |
Mortgages [Member] | 1400 Broadway - First Lien [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Fixed rate mortgage debt | 69,920 |  | 0 |
Stated Rate | 6.12% |  |  |
Effective Rate | 3.85% | [2] |  |
Mortgages [Member] | 1400 Broadway - Second Lien [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Fixed rate mortgage debt | 9,853 |  | 0 |
Stated Rate | 3.35% |  |  |
Effective Rate | 1.03% | [2] |  |
Mortgages [Member] | 112 West 34th Street - First Lien [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Fixed rate mortgage debt | 77,744 |  | 0 |
Stated Rate | 6.01% |  |  |
Effective Rate | 3.45% | [2] |  |
Mortgages [Member] | 112 West 34th Street - Second Lien [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Fixed rate mortgage debt | 9,792 |  | 0 |
Stated Rate | 6.56% |  |  |
Effective Rate | 4.01% | [2] |  |
Mortgages [Member] | 1350 Broadway - First Lien Mortgage Loan [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Fixed rate mortgage debt | 39,033 |  | 39,420 |
Stated Rate | 5.87% |  |  |
Effective Rate | 4.39% | [2] |  |
Mortgages [Member] | Exchangeable Senior Notes [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Fixed rate mortgage debt | 250,000 |  | 0 |
Stated Rate | 2.63% |  |  |
Effective Rate | 3.92% | [2] |  |
Mortgages [Member] | 501 Seventh Avenue - Third Lien [Member] | LIBOR [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Floating rate mortgage debt | 0 |  | 6,540 |
Basis spread on variable rate | 1.00% | [3] |  |
Interest rate at end of period | 4.25% | [3] |  |
Mortgages [Member] | Floating Rate Debt - 1350 Broadway - 2nd Lien Mortgage Loan [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Floating rate mortgage debt | 13,677 |  | 13,409 |
Mortgages [Member] | One Grand Central Place - Third Lien [Member] | Prime Rate [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Floating rate mortgage debt | 6,382 |  | 6,382 |
Stated Rate | 3.75% | [4] |  |
Basis spread on variable rate | 0.50% | [4] |  |
Interest rate at end of period | 3.75% | [4] |  |
Mortgages [Member] | 250 West 57th Street - Third lien [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Stated Rate | 4.25% | [5] |  |
Basis spread on variable rate | 1.00% | [5] |  |
Interest rate at end of period | 4.25% | [5] |  |
Principal outstanding minimum increments | 5,000 | [5] |  |
Mortgages [Member] | 250 West 57th Street - Third lien [Member] | Interest Rate Fix Option 1 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Stated Rate | 4.75% | [5] |  |
Basis spread on variable rate | 3.00% | [5] |  |
Number of days prior to the Effective date to fix the interest rate | 2 days | [5] |  |
Mortgages [Member] | 250 West 57th Street - Third lien [Member] | Interest Rate Fix Option 2 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Stated Rate | 5.00% | [5] |  |
Basis spread on variable rate | 3.00% | [5] |  |
Number of days prior to the Effective date to fix the interest rate | 30 days | [5] |  |
Mortgages [Member] | 250 West 57th Street - Third lien [Member] | Prime Rate [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Floating rate mortgage debt | 21,000 |  | 21,000 |
Mortgages [Member] | Secured Revolving Credit Facility [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Floating rate mortgage debt | 55,600 |  | 25,000 |
Mortgages [Member] | Secured Revolving Credit Facility [Member] | LIBOR [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Basis spread on variable rate | 1.20% | [6] |  |
Interest rate at end of period | 1.36% | [6] |  |
Mortgages [Member] | Secured Term Credit Facility [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Floating rate mortgage debt | $ 300,000 |  | $ 300,000 |
Mortgages [Member] | Secured Term Credit Facility [Member] | LIBOR [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Basis spread on variable rate | 1.35% | [7] |  |
Interest rate at end of period | 1.51% | [7] |  |
[1] | The loan was consolidated in February 2014.
[2] | The effective rate is the yield as of September 30, 2014, including the effects of debt issuance costs.
[3] | Interest at the greater of 4.25% and Prime plus 1.0%. The rate at September 30, 2014 was 4.25%.
[4] | Interest at the greater of Prime plus 0.50% and 3.75%. The rate as of September 30, 2014 was 3.75%.
[5] | Interest at the greater of 4.25% and Prime plus 1.0%. Prior to January 5, 2015, we have the option to fix the interest rate on all or any portion of the principal then outstanding, up to three times and in minimum increments of $5,000 to an annual rate equal to either (i) the greater of (a) 4.75% or (b) 300 basis points in excess of the weekly average yield on United States Treasury Securities adjusted to a maturity closest to January 5, 2015 as most recently made available by the Federal Reserve Board as of two days prior to the effective date of the fixing of the interest rate, and (ii) the greater of (a) 5.00% or (b) 300 basis points in excess of the weekly average yield on United States Treasury Securities adjusted to a maturity closest to January 5, 2015 as most recently made available by the Federal Reserve Board as of 30 days prior to the effective date of the fixing of the interest rate. If option (i) is selected, we will be subject to the payment of pre‑payment fees, and if option (ii) is selected, we may prepay the loan without any pre‑payment fees. The rate as of September 30, 2014 was 4.25%.
[6] | Floating at 30 day LIBOR plus 1.20%. The rate as of September 30, 2014 was 1.36%.
[7] | Floating at 30 day LIBOR plus 1.35%. The rate at September 30, 2014 was 1.51%.

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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 SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 20 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 3: 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 4: 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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