Basis of presentation and significant accounting policies - Non-cash investing and financing information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Supplemental cash flow information:
Cash paid for interest, net of capitalized interest	$ 94,867	$ 77,401	$ 58,216
Net cash (received) paid for income taxes	0	2,129	3,187
Supplemental non-cash investing information:
Fair value of contingent consideration asset (liability) on transaction closing date	33,832	(225)	(6,150)
Change in accrued capital expenditures	22,310	(8,053)	6,353
Capitalized share-settled equity-based compensation	1,583	3,418	4,470
Capitalized asset retirement cost	14,610	2,252	4,755
Capitalized interest	5,866	3,019	$ 805
Right-of-use assets obtained in exchange for operating lease liabilities	$ 7,742	$ 2,349