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Derivatives and Hedging Activities (Details)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
USD ($)
Debt_Instrument
Sep. 30, 2017
USD ($)
Sep. 30, 2018
USD ($)
Debt_Instrument
Sep. 30, 2017
USD ($)
Dec. 31, 2017
Derivative Instruments, Gain (Loss) [Line Items]          
Amount of gain (loss) recognized in OCI on derivative(1) $ 4,061 $ (179) $ 23,107 $ (1,944)  
Amount of (gain) loss reclassified from AOCI into interest expense(1) $ (1,192) $ 228 (1,895) $ 1,203  
Interest Rate Swap | Designated as Hedging Instrument          
Derivative Instruments, Gain (Loss) [Line Items]          
Derivative instruments, gain (loss) reclassification from OCI to income, estimated net amount to be transferred     $ 8,800    
Count | Debt_Instrument 6   6    
Derivative, notional amount $ 992,000   $ 992,000    
Interest Rate Swap | Designated as Hedging Instrument | Minimum          
Derivative Instruments, Gain (Loss) [Line Items]          
Fixed LIBOR 1.20%   1.20%   1.20%
Interest Rate Swap | Designated as Hedging Instrument | Maximum          
Derivative Instruments, Gain (Loss) [Line Items]          
Fixed LIBOR 2.20%   2.20%   2.20%