Earnings per share attributable to stockholders (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Net income (loss) attributable to:
Basic	$ 42,909	$ 32,336	$ 274,368	$ 121,273
Diluted	$ 42,909	$ 32,336	$ 274,368	$ 121,273
Weighted average number of shares outstanding:
Basic	110,838,237	110,410,172	110,750,021	110,233,851
Effect of dilutive securities:		111,391,396
Diluted	112,209,535	111,391,396	111,858,095	111,333,247
Per Share Amount
Basic	$ 0.39	$ 0.29	$ 2.48	$ 1.10
Diluted	$ 0.38	$ 0.29	$ 2.45	$ 1.09
Share Units [Member]
Weighted average number of shares outstanding:
Effect of dilutive securities:	641,284	324,218	496,273	408,574
Per Share Amount
Effect of dilutive securities:			(0.01)
Stock Options [Member]
Weighted average number of shares outstanding:
Effect of dilutive securities:	730,014		611,801	690,822
Diluted		657,006
Per Share Amount
Effect of dilutive securities:	(0.01)		(0.02)	(0.01)