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Net Income Per Common Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Earnings Per Share [Abstract]
Net income	$ 37,050	$ 10,020
Computation of basic and diluted net income per common share
Weighted average common shares outstanding during the period (for basic calculation)	38,778	38,500
Dilutive effect of other potential common shares	618	401
Weighted average common shares and potential common shares (for diluted calculation)	39,396	38,901
Net income per common share - Basic	$ 0.96	$ 0.26
Net income per common share - Diluted	$ 0.94	$ 0.26
Stock awards [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive stock awards	0	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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