Other Non-current Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Other Non-current Liabilities
Operating lease liability	$ 111,322
Tax payable	20,232	$ 22,583
Finance lease liability	16,336	10,146
Other	3,348	9,251
Other non-current liabilities, Total	$ 151,238	$ 41,980