Derivative Instruments - Summary of Fair Value of Derivative Instruments (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Derivative Asset [Abstract]
Derivative instruments	$ 29,721	$ 4,464
Derivative Liability [Abstract]
Total derivative instrument assets	29,721	4,464
Total derivative instrument liabilities	8,094	12,968
Interest rate swaps | Derivatives designated as hedging instruments:
Derivative Asset [Abstract]
Derivative instruments	1,407	0
Derivative Liability [Abstract]
Derivative liability, current	0	5,218
Interest rate swaps | Derivatives not designated as hedging instruments:
Derivative Liability [Abstract]
Derivative liability, noncurrent	230	330
Contingent redemption features - Series A Preferred Stock | Derivatives not designated as hedging instruments:
Derivative Asset [Abstract]
Derivative instruments	28,314	4,464
Cross currency and interest rate swaps | Derivatives not designated as hedging instruments:
Derivative Liability [Abstract]
Derivative liability, noncurrent	$ 7,864	$ 7,420