Other non-current liabilities (Details) - USD ($)	Jun. 30, 2022	Mar. 17, 2022	Dec. 31, 2021
Other non-current liabilities
Operating lease liability	$ 118,737,000	$ 4,477,000	$ 109,882,000
Tax payable	19,657,000		18,859,000
Finance lease liability	$ 13,458,000		$ 13,983,000
Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible Enumeration]	Total other non-current liabilities		Total other non-current liabilities
Other	$ 4,059,000		$ 4,536,000
Total other non-current liabilities	$ 155,911,000		$ 147,260,000
Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List]	Total other non-current liabilities		Total other non-current liabilities