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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, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Computation of basic and diluted net income per common share
Net income	$ 31,661	$ 9,981	$ 63,835	$ 34,159
Weighted average common shares outstanding during the period (for basic calculation)	38,660	38,814	38,601	38,827
Dilutive effect of other potential common shares	479	306	361	123
Weighted average common shares and potential common shares (for diluted calculation)	39,139	39,120	38,962	38,950
Net income per common share - Basic	$ 0.82	$ 0.26	$ 1.65	$ 0.88
Net income per common share - Diluted	$ 0.81	$ 0.26	$ 1.64	$ 0.88
Stock awards [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive stock awards	0	200	200	200

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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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