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Net Income Per Common Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2018	Mar. 31, 2018	Jun. 30, 2019	Jun. 30, 2018
Earnings Per Share [Abstract]
Net income	$ 27,718	$ 11,389	$ 41,825	$ 37,050	$ 39,107	$ 78,875
Computation of basic and diluted net income per common share
Weighted average common shares outstanding during the period (for basic calculation)	39,087		38,981		38,986	38,880
Dilutive effect of other potential common shares	112		422		199	504
Weighted average common shares and potential common shares (for diluted calculation)	39,199		39,403		39,185	39,384
Net income per common share - Basic	$ 0.71		$ 1.07		$ 1.00	$ 2.03
Net income per common share - Diluted	$ 0.71		$ 1.06		$ 1.00	$ 2.00
Stock awards [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive stock awards	200		0		200	100

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Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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