Earnings per share attributable to stockholders (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Net income (loss) attributable to:
Basic	$ 178,094	$ 28,188
Diluted	$ 178,094	$ 28,188
Weighted average number of shares outstanding:
Basic	110,647,700	109,972,997
Effect of dilutive securities:		111,267,392
Diluted	111,655,861	111,267,392
Per Share Amount
Basic	$ 1.61	$ 0.26
Diluted	$ 1.60	$ 0.25
Share Units [Member]
Weighted average number of shares outstanding:
Effect of dilutive securities:	450,259	579,133
Stock Options [Member]
Weighted average number of shares outstanding:
Effect of dilutive securities:	557,902
Diluted		715,262
Per Share Amount
Effect of dilutive securities:	(0.01)	(0.01)