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Derivative Instruments - Summary of Fair Value of Derivative Instruments (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Apr. 23, 2018
Dec. 31, 2017
Assets      
Derivative instruments $ 15,410   $ 48,186
Liabilities      
Total derivative instrument assets 15,410   48,186
Total derivative instrument liabilities 7,716   13,848
Derivatives designated as hedging instruments: | Interest rate swaps      
Assets      
Derivative instruments 15,289   6,046
Derivatives designated as hedging instruments: | Net investment cross currency swaps      
Assets      
Derivative instruments 121   0
Liabilities      
Derivative liability, noncurrent 0   1,451
Derivatives not designated as hedging instruments: | Interest rate swaps      
Liabilities      
Derivative liability, current 72   179
Derivatives not designated as hedging instruments: | Contingent redemption features - Series A Preferred Stock      
Assets      
Derivative instruments 0 $ 140,300 42,140
Derivatives not designated as hedging instruments: | Cross currency and interest rate swaps      
Liabilities      
Derivative liability, noncurrent 7,644   7,939
Derivative liability, current $ 0   $ 4,279