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Net Income Per Common Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended						9 Months Ended
	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Sep. 30, 2022	Sep. 30, 2021
Earnings Per Share [Abstract]
Net income	$ 219,587	$ 218,111	$ 302,600	$ 91,699	$ 302,556	$ 149,156	$ 740,298	$ 543,411
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			39,521	39,413
Dilutive effect of other potential common shares	232			219			241	210
Weighted average common shares and potential common shares (for diluted calculation)	39,776			39,661			39,762	39,623
Net income per common share - Basic	$ 5.55			$ 2.32			$ 18.73	$ 13.79
Net income per common share - Diluted	$ 5.52			$ 2.31			$ 18.62	$ 13.71
Stock awards [Member]
Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table]
Antidilutive stock awards	100			0			100	100

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