Derivative Instruments - Schedule of Gain or Loss Recognized on Interest Rate Derivatives Designated as Cash Flow Hedges (Details) - Cash flow hedging - Designated as hedging instrument - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Derivative Instruments, Gain (Loss) [Line Items]
Amount of loss recognized in cumulative other comprehensive income (loss)	$ (114)	$ (326)	$ (268)	$ (771)
Amount of loss reclassified from cumulative other comprehensive income (loss) into interest expense	$ 6	$ 1,106	$ 7	$ 2,224