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Net Income Per Common Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Earnings Per Share [Abstract]
Net income	$ 96,733	$ 302,600
Computation of basic and diluted net income per common share
Weighted average common shares outstanding during the period (for basic calculation)	39,593	39,474
Dilutive effect of other potential common shares	245	294
Weighted average common shares and potential common shares (for diluted calculation)	39,838	39,768
Net income per common share - Basic	$ 2.44	$ 7.67
Net income per common share - Diluted	$ 2.43	$ 7.61

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