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Fair Value Measurements (Summary of Derivative Instruments) (Details) - Interest Rate Swap - Designated as Hedging Instrument
Dec. 31, 2019
USD ($)
Other Assets  
Derivative [Line Items]  
Derivative Asset, Fair Value $ 4,327,000
Derivative Asset, Notional Amount 1,250,000,000
Other Liabilities  
Derivative [Line Items]  
Derivative Liability, Fair Value 40,354,000
Derivative Liability, Notional Amount 850,000,000
770 Broadway mortgage loan | Other Assets  
Derivative [Line Items]  
Derivative Asset, Fair Value 4,045,000
Derivative Asset, Notional Amount $ 700,000,000
Derivative, Interest Rate 3.46%
Derivative, Swap Rate 2.56%
888 Seventh Avenue mortgage loan | Other Assets  
Derivative [Line Items]  
Derivative Asset, Fair Value $ 218,000
Derivative Asset, Notional Amount $ 375,000,000
Derivative, Interest Rate 3.44%
Derivative, Swap Rate 3.25%
Other | Other Assets  
Derivative [Line Items]  
Derivative Asset, Fair Value $ 64,000
Derivative Asset, Notional Amount 175,000,000
Unsecured term loan | Other Liabilities  
Derivative [Line Items]  
Derivative Liability, Fair Value 36,809,000
Derivative Liability, Notional Amount $ 750,000,000
Derivative, Interest Rate 2.80%
Derivative, Swap Rate 3.87%
33-00 Northern Boulevard mortgage loan | Other Liabilities  
Derivative [Line Items]  
Derivative Liability, Fair Value $ 3,545,000
Derivative Liability, Notional Amount $ 100,000,000
Derivative, Interest Rate 3.52%
Derivative, Swap Rate 4.14%
LIBOR | 770 Broadway mortgage loan | Other Assets  
Derivative [Line Items]  
Derivative, Average Basis Spread on Variable Rate 1.75%
LIBOR | 888 Seventh Avenue mortgage loan | Other Assets  
Derivative [Line Items]  
Derivative, Average Basis Spread on Variable Rate 1.70%
LIBOR | Unsecured term loan | Other Liabilities  
Derivative [Line Items]  
Derivative, Average Basis Spread on Variable Rate 1.00%
LIBOR | 33-00 Northern Boulevard mortgage loan | Other Liabilities  
Derivative [Line Items]  
Derivative, Average Basis Spread on Variable Rate 1.80%