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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, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Earnings Per Share [Abstract]
Net income	$ 41,825	$ 22,154	$ 78,875	$ 32,174
Computation of basic and diluted net income per common share
Weighted average common shares outstanding during the period (for basic calculation)	38,981	38,643	38,880	38,572
Dilutive effect of other potential common shares	422	359	504	359
Weighted average common shares and potential common shares (for diluted calculation)	39,403	39,002	39,384	38,931
Net income per common share - Basic	$ 1.07	$ 0.57	$ 2.03	$ 0.83
Net income per common share - Diluted	$ 1.06	$ 0.57	$ 2.00	$ 0.83
Stock awards [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive stock awards	0	0	100	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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