Derivative Financial Instruments - Summary of Effect of Derivative Financial Instruments on the Condensed Consolidated Statements of Operations (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Designated as Hedging Instrument | Interest Rate Swaps and Collars
Derivative Instruments Gain Loss [Line Items]
Amount of Gain or (Loss) Recognized in OCI on Derivative	$ 2,404	$ 783
Location of Gain or (Loss) Reclassified from Accumulated OCI into Income	Interest expense
Amount of Gain or (Loss) Reclassified from Accumulated OCI into Net Income	$ 52	$ (255)
Not Designated as Hedging Instrument | Foreign Currency Forward Contracts
Derivative Instruments Gain Loss [Line Items]
Amount of Gain or (Loss) Recognized in Net Income	$ 1,394
Location of Gain or (Loss) Recognized in Net Income	Foreign currency (loss) gain, net