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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, 2019	Jun. 30, 2019	Mar. 31, 2019	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Sep. 30, 2019	Sep. 30, 2018
Earnings Per Share [Abstract]
Net income	$ 27,171	$ 27,718	$ 11,389	$ 13,848	$ 41,825	$ 37,050	$ 66,278	$ 92,723
Computation of basic and diluted net income per common share
Weighted average common shares outstanding during the period (for basic calculation)	39,087			38,998			39,020	38,920
Dilutive effect of other potential common shares	205			463			182	477
Weighted average common shares and potential common shares (for diluted calculation)	39,292			39,461			39,202	39,397
Net income per common share - Basic	$ 0.70			$ 0.36			$ 1.70	$ 2.38
Net income per common share - Diluted	$ 0.69			$ 0.35			$ 1.69	$ 2.35
Stock awards [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive stock awards	0			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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