Other non-current assets (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Other non-current assets
Right-of-use assets	$ 119,592	$ 116,503
Tax receivable	9,717	11,050
Loans receivable	4,241	4,870
Deferred debt issue costs	1,865	2,263
Other	11,475	12,922
Other non-current assets	$ 146,890	$ 147,608