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Net Income Per Common Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Earnings Per Share [Abstract]
Net Income	$ 857,658	$ 712,486	$ 174,979
Computation of basic and diluted net income per common share
Weighted average common shares outstanding during the period (for basic calculation)	39,526	39,420	39,277
Dilutive effect of other potential common shares	246	226	154
Weighted average common shares and potential common shares (for diluted calculation)	39,772	39,646	39,431
Net income per common share - Basic	$ 21.70	$ 18.07	$ 4.45
Net income (loss) per common share – Diluted	$ 21.56	$ 17.97	$ 4.44
Stock Awards [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive stock awards	100	0	0

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