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Net Income Per Common Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2022	Mar. 31, 2022	Jun. 30, 2021	Mar. 31, 2021	Jun. 30, 2022	Jun. 30, 2021
Earnings Per Share [Abstract]
Net income	$ 218,111	$ 302,600	$ 302,556	$ 149,156	$ 520,711	$ 451,712
Computation of basic and diluted net income per common share
Weighted average common shares outstanding during the period (for basic calculation)	39,544		39,442		39,509	39,399
Dilutive effect of other potential common shares	219		246		253	234
Weighted average common shares and potential common shares (for diluted calculation)	39,763		39,688		39,762	39,633
Net income per common share - Basic	$ 5.52		$ 7.67		$ 13.18	$ 11.47
Net income per common share - Diluted	$ 5.49		$ 7.62		$ 13.10	$ 11.40
Stock awards [Member]
Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table]
Antidilutive stock awards	100		0		100	200

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