Other non-current assets (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Other non-current assets
Right-of-use assets	$ 107,760	$ 116,209
Tax receivable	9,631	11,792
Equity-accounted investments		4,276
Deferred debt issue costs	958	1,403
Other	12,977	11,999
Other non-current assets	$ 131,326	$ 145,679