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Derivative Instruments - Summary of Fair Value of Derivative Instruments (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Apr. 23, 2018	Dec. 31, 2017
Derivative assets
Derivative instruments	$ 3,259		$ 48,186
Derivative liabilities
Total derivative instrument assets	3,259		48,186
Total derivative instrument liabilities	10,677		13,848
Derivatives designated as hedging instruments: \| Interest rate swaps
Derivative assets
Derivative instruments	0		6,046
Derivatives designated as hedging instruments: \| Cross currency swaps
Derivative assets
Derivative instruments	3,259		0
Derivatives designated as hedging instruments: \| Net investment cross currency swaps
Derivative liabilities
Derivative liability, noncurrent	0		1,451
Derivatives not designated as hedging instruments: \| Interest rate swaps
Derivative liabilities
Derivative liability, current	0		179
Derivatives not designated as hedging instruments: \| Cross currency swaps
Derivative liabilities
Derivative liability, current	4,021		4,279
Derivative liability, noncurrent	6,656		7,939
Derivatives not designated as hedging instruments: \| Contingent redemption features - Series A Preferred Stock
Derivative assets
Derivative instruments	$ 0	$ 140,300	$ 42,140