Other Non-current Assets (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Other Non-current Assets [Abstract]
Right-of-use asset	$ 96,805
Tax receivable	13,234	$ 12,705
Equity-accounted investments	4,235	4,010
Deferred debt issue costs	1,884	2,017
Other	10,921	10,663
Other Non-current Assets, Total	$ 127,079	$ 29,395