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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, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Computation of basic and diluted net income per common share
Net income	$ 9,981	$ 22,007	$ 34,159	$ 49,854
Weighted average common shares outstanding during the period (for basic calculation)	38,814	39,127	38,827	39,372
Dilutive effect of other potential common shares	306	113	123	101
Weighted average common shares and potential common shares (for diluted calculation)	39,120	39,240	38,950	39,473
Net income per common share - Basic	$ 0.26	$ 0.56	$ 0.88	$ 1.27
Net income per common share - Diluted	$ 0.26	$ 0.56	$ 0.88	$ 1.26
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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