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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, 2021	Jun. 30, 2021	Mar. 31, 2021	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Sep. 30, 2021	Sep. 30, 2020
Earnings Per Share [Abstract]
Net income	$ 91,699	$ 302,556	$ 149,156	$ 103,192	$ 33,586	$ 12,200	$ 543,411	$ 148,978
Computation of basic and diluted net income per common share
Weighted average common shares outstanding during the period (for basic calculation)	39,442			39,315			39,413	39,264
Dilutive effect of other potential common shares	219			211			210	132
Weighted average common shares and potential common shares (for diluted calculation)	39,661			39,526			39,623	39,396
Net income per common share - Basic	$ 2.32			$ 2.62			$ 13.79	$ 3.79
Net income per common share - Diluted	$ 2.31			$ 2.61			$ 13.71	$ 3.78
Stock awards [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive stock awards	0			0			100	200

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