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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
	Mar. 31, 2016	Mar. 31, 2015
Earnings (Loss) Per Share [Abstract]
Net income (loss)	$ (26,432)	$ 122,641
Weighted average number of common shares outstanding	29,893	31,036
Dilutive stock awards		556
Diluted weighted average number of common shares outstanding	29,893	31,592
Basic earnings (loss) per share	$ (0.88)	$ 3.95
Diluted earnings (loss) per share	$ (0.88)	$ 3.88

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- 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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