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Debt - Schedule of Long term Debt (Details) - USD ($)	3 Months Ended
	Mar. 31, 2016	Dec. 31, 2015	Aug. 31, 2015	Mar. 31, 2015	Aug. 31, 2014
Debt Instrument [Line Items]
Unsecured revolving credit facility, net	$ 0	$ 35,192,000
Deferred financing costs, net	(12,907,000)	(12,910,000)
Total	772,015,000	747,661,000
Mortgages
Debt Instrument [Line Items]
Total mortgage debt	761,893,000	735,145,000
Total principal	1,626,893,000	1,640,145,000
Unamortized premiums, net of unamortized discount	4,112,000	5,181,000
Deferred financing costs, net	(8,489,000)	(12,910,000)
Total	1,622,516,000	1,632,416,000
Mortgages | 10 Bank Street
Debt Instrument [Line Items]
Fixed rate mortgage debt	$ 32,050,000	32,214,000
Stated Rate	5.72%
Effective Rate	6.22%
Mortgages | 1542 Third Avenue
Debt Instrument [Line Items]
Fixed rate mortgage debt	$ 18,117,000	18,222,000
Stated Rate	5.90%
Effective Rate	6.58%
Mortgages | First Stamford Place
Debt Instrument [Line Items]
Fixed rate mortgage debt	$ 237,842,000	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	$ 26,926,000	27,064,000
Stated Rate	5.69%
Effective Rate	6.39%
Mortgages | 383 Main Avenue
Debt Instrument [Line Items]
Fixed rate mortgage debt	$ 29,119,000	29,269,000
Stated Rate	5.59%
Effective Rate	6.04%
Mortgages | 1333 Broadway
Debt Instrument [Line Items]
Fixed rate mortgage debt	$ 68,404,000	68,646,000
Stated Rate	6.32%
Effective Rate	3.77%
Mortgages | 1400 Broadway - First Lien
Debt Instrument [Line Items]
Fixed rate mortgage debt	$ 68,483,000	68,732,000
Stated Rate	6.12%
Effective Rate	3.43%
Mortgages | 1400 Broadway - Second Lien
Debt Instrument [Line Items]
Fixed rate mortgage debt	$ 9,548,000	9,600,000
Stated Rate	3.35%
Effective Rate	3.36%
Mortgages | 112 West 34th Street - First Lien
Debt Instrument [Line Items]
Fixed rate mortgage debt	$ 76,126,000	76,406,000
Stated Rate	6.01%
Effective Rate	3.39%
Mortgages | 112 West 34th Street - Second Lien
Debt Instrument [Line Items]
Fixed rate mortgage debt	$ 9,608,000	9,640,000
Stated Rate	6.56%
Effective Rate	3.70%
Mortgages | 1350 Broadway - First Lien Mortgage Loan
Debt Instrument [Line Items]
Fixed rate mortgage debt	$ 38,205,000	38,348,000
Stated Rate	5.87%
Effective Rate	3.75%
Mortgages | Metro Center
Debt Instrument [Line Items]
Fixed rate mortgage debt	$ 97,465,000	97,950,000
Stated Rate	3.59%
Effective Rate	3.67%
Mortgages | 10 Union Square
Debt Instrument [Line Items]
Fixed rate mortgage debt	$ 50,000,000	20,289,000
Stated Rate	3.70%
Effective Rate	4.05%
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	$ 0	40,000,000
Effective Rate	1.58%
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	$ 265,000,000	$ 265,000,000
Effective Rate	2.03%
Pay Rate	2.1485%
Revolving Credit Facility | Term Loan | LIBOR
Debt Instrument [Line Items]
Basis spread on variable rate	1.60%

X

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Long Term Debt, Fixed Rate Debt and Floating Rate Debt, Total

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Percentage points added to the reference rate to compute the variable rate on the debt instrument.

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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.

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Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

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Contractual interest rate for funds borrowed, under the debt agreement.

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Amount, after accumulated amortization, of debt discount (premium).

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Amount, after accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

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Fixed interest rate related to the interest rate derivative.

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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.

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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The portion of the carrying amount of long-term borrowings outstanding as of the balance sheet date, including current maturities, which accrues interest at a set, unchanging rate.

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