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Derivative Instruments - Summary of Fair Value of Derivative Instruments (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018	Apr. 23, 2018
Assets
Long-term assets:	$ 6,197	$ 3,259
Liabilities
Total derivative instrument assets	9,974	3,259
Total derivative instrument liabilities	1,223	10,677
Derivatives designated as hedging instruments: \| Net investment cross currency swaps
Assets
Long-term assets:	6,197	3,259
Derivatives not designated as hedging instruments: \| Contingent redemption features - Series A Preferred Stock
Assets
Long-term assets:			$ 140,300
Derivatives not designated as hedging instruments: \| Cross currency swaps
Assets
Current assets:	3,777	0
Liabilities
Current liabilities:	1,223	4,021
Long-term liabilities:	$ 0	$ 6,656