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Net Income Per Common Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Earnings Per Share [Abstract]
Net income	$ 302,600	$ 149,156
Computation of basic and diluted net income per common share
Weighted average common shares outstanding during the period (for basic calculation)	39,474	39,355
Dilutive effect of other potential common shares	294	275
Weighted average common shares and potential common shares (for diluted calculation)	39,768	39,630
Net income per common share - Basic	$ 7.67	$ 3.79
Net income per common share - Diluted	$ 7.61	$ 3.76

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