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Earnings (Loss) Per Share (Basic and Diluted Earnings) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Earnings (Loss) Per Share [Abstract]
Net income (loss)	$ 66,730	$ 25,596	$ 112,850	$ (836)
Weighted average number of common shares outstanding	28,649	29,207	28,699	29,550
Dilutive stock awards	151	133	126	0
Diluted weighted average number of common shares outstanding	28,800	29,340	28,825	29,550
Basic earnings (loss) per share	$ 2.33	$ 0.88	$ 3.93	$ (0.03)
Diluted earnings (loss) per share	$ 2.32	$ 0.87	$ 3.92	$ (0.03)

X

- Definition

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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The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of share based payment arrangements using the treasury stock method.

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