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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, 2020	Jun. 30, 2020	Mar. 31, 2020	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Sep. 30, 2020	Sep. 30, 2019
Earnings Per Share [Abstract]
Net income	$ 103,192	$ 33,586	$ 12,200	$ 27,171	$ 27,718	$ 11,389	$ 148,978	$ 66,278
Computation of basic and diluted net income per common share
Weighted average common shares outstanding during the period (for basic calculation)	39,315			39,087			39,264	39,020
Dilutive effect of other potential common shares	211			205			132	182
Weighted average common shares and potential common shares (for diluted calculation)	39,526			39,292			39,396	39,202
Net income per common share - Basic	$ 2.62			$ 0.70			$ 3.79	$ 1.70
Net income per common share - Diluted	$ 2.61			$ 0.69			$ 3.78	$ 1.69
Stock awards [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive stock awards	0			0			200	200

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