Other supplemental information - cash flow information (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Cash paid for taxes, net of refunds	$ 2,396	$ (8,703)
Cash paid for interest	41,898	49,902
Non-cash investing and financing activities:
Accrued capital expenditures	$ 1,406	$ 924