Derivatives and Hedging Activities - Schedule of Derivative Instruments, Gain (Loss) in Statement of Financial Performance (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Derivative Instruments, Gain (Loss) [Line Items]
Interest Expense	$ 15,689	$ 14,415	$ 30,851	$ 27,390
Interest rate swaps, net
Derivative Instruments, Gain (Loss) [Line Items]
Amount of (loss) gain recognized in accumulated other comprehensive income (loss) from derivatives (effective portion)	(4,397)		(9,094)
Interest rate swaps, net | Interest Expense
Derivative Instruments, Gain (Loss) [Line Items]
Amount of loss reclassified from accumulated other comprehensive income (loss) into income as interest expense (effective portion)	$ (481)		$ (980)
Cash Flow Hedging | Interest rate swaps, net
Derivative Instruments, Gain (Loss) [Line Items]
Amount of (loss) gain recognized in accumulated other comprehensive income (loss) from derivatives (effective portion)		7,076		6,646
Cash Flow Hedging | Interest rate swaps, net | Interest Expense
Derivative Instruments, Gain (Loss) [Line Items]
Amount of loss reclassified from accumulated other comprehensive income (loss) into income as interest expense (effective portion)		$ (1,039)		$ (2,344)