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Derivative Instruments and Hedging Activities - Additional Information (Details)
3 Months Ended
Mar. 31, 2017
USD ($)
Derivative
Mar. 31, 2016
USD ($)
Dec. 31, 2016
USD ($)
Derivative [Line Items]      
Fair value of derivative obligations to be settled $ 0   $ 22,446,000
Change in value of interest rate swaps $ 4,032,000 $ (29,867,000)  
Number of derivative instruments | Derivative 0    
Designated as Hedging Instrument [Member] | Interest Rate Swap [Member] | Cash Flow Hedges [Member]      
Derivative [Line Items]      
Fair value of derivative obligations to be settled     1,219,000
Change in value of interest rate swaps $ 4,032,000 (29,867,000)  
Estimated accumulated other comprehensive income (loss) reclassified to interest expense in the next twelve months 5,558,000    
Designated as Hedging Instrument [Member] | Interest Rate Swap [Member] | 1633 Broadway [Member] | Cash Flow Hedges [Member]      
Derivative [Line Items]      
Aggregate notional amount 1,000,000,000    
Designated as Hedging Instrument [Member] | Interest Rate Swap March Two Thousand Seventeen [Member] | 1633 Broadway [Member] | Cash Flow Hedges [Member]      
Derivative [Line Items]      
Aggregate notional amount 400,000,000    
Not Designated as Hedging Instrument [Member] | Interest Rate Swap [Member]      
Derivative [Line Items]      
Derivative liability fair Value     $ 21,227,000
Unrealized gains on interest rate swaps $ 1,802,000 $ 6,860,000