Net income (loss) per common share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]
Net income (loss) (numerator)	$ 337,523	$ 136,832	$ 513,288	$ (71,268)
Weighted-average common shares outstanding (denominator):
Basic (in shares)	16,650	15,756	16,750	13,464
Diluted (in shares)	16,809	15,993	16,963	13,464
Net income (loss) per common share:
Basic (in USD per share)	$ 20.27	$ 8.68	$ 30.64	$ (5.29)
Diluted (in USD per share)	$ 20.08	$ 8.56	$ 30.26	$ (5.29)
Restricted stock awards
Weighted-average common shares outstanding (denominator):
Incremental common shares (in shares)	159	187	197	0
Performance share awards
Weighted-average common shares outstanding (denominator):
Incremental common shares (in shares)	0	50	16	0