Derivative Instruments - Summary of Unrealized Gain (Loss) Recorded In and Reclassified From Accumulated Other Comprehensive Income (Details) - Derivatives designated as hedging instruments: - Interest rate swaps - Cash Flow Hedging - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Derivative Instruments, Gain (Loss) [Line Items]
Gain Recognized in Comprehensive Income (Effective Portion)	$ 525	$ 2,386	$ 6,625	$ 5,509
Interest expense
Derivative Instruments, Gain (Loss) [Line Items]
Loss Reclassified from AOCI to Income (Effective Portion)	$ (972)	$ (2,687)	$ (6,705)	$ (8,002)