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Net Income Per Common Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Earnings Per Share [Abstract]
Net Income	$ 4,100	$ 10,000	$ 19,200	$ 5,000	$ 2,300	$ 22,000	$ 20,200	$ 7,600	$ 38,254	$ 52,182	$ 80,009
Computation of basic and diluted net income (loss) per common share
Weighted average common shares outstanding during the period (for basic calculation)									38,761	39,239	39,412
Dilutive effect of other potential common shares									164	116	80
Weighted average common shares and potential common shares (for diluted calculation)									38,925	39,355	39,492
Net income per common share - Basic	$ 0.11	$ 0.26	$ 0.50	$ 0.13					$ 0.99	$ 1.33	$ 2.03
Net income per common share - Diluted	$ 0.11	$ 0.26	$ 0.49	$ 0.13					$ 0.98	$ 1.33	$ 2.03
Stock Awards [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive stock awards									200	100	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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The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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