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Derivative Instruments and Hedging Activities - Additional Information (Details)
1 Months Ended 3 Months Ended 9 Months Ended
Jan. 19, 2017
USD ($)
Sep. 30, 2018
USD ($)
Derivative
Sep. 30, 2017
USD ($)
Sep. 30, 2018
USD ($)
Derivative
Sep. 30, 2017
USD ($)
Derivative [Line Items]          
Change in value of interest rate swaps   $ 4,161,000 $ (697,000) $ 24,363,000 $ (5,226,000)
Number of derivative instruments | Derivative   0   0  
Designated as Hedging Instrument [Member] | Interest Rate Swap [Member] | Cash Flow Hedges [Member]          
Derivative [Line Items]          
Change in value of interest rate swaps   $ 3,392,000 $ 738,000 $ 23,738,000 $ 729,000
Estimated accumulated other comprehensive income (loss) reclassified to interest expense in the next twelve months       8,223,000  
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   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   $ 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