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Derivative Instruments and Hedging Activities - Additional Information (Details)
1 Months Ended 3 Months Ended
Jan. 19, 2017
USD ($)
Mar. 31, 2018
USD ($)
Derivative
Mar. 31, 2017
USD ($)
Derivative [Line Items]      
Change in value of interest rate swaps   $ 14,551,000 $ 4,032,000
Number of derivative instruments | Derivative   0  
Designated as Hedging Instrument [Member] | Interest Rate Swap [Member] | Cash Flow Hedges [Member]      
Derivative [Line Items]      
Change in value of interest rate swaps   $ 14,551,000 $ 4,032,000
Estimated accumulated other comprehensive income (loss) reclassified to interest expense in the next twelve months   3,443,000  
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 Eighteen [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]      
Unrealized gains on interest rate swaps $ 1,802,000