Other non-current assets (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Other non-current assets
Right-of-use assets	$ 119,958	$ 116,503
Tax receivable	10,842	11,050
Loans receivable	4,569	4,870
Deferred debt issue costs	2,065	2,263
Other	11,448	12,922
Other non-current assets	$ 148,882	$ 147,608