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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, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Earnings (Loss) Per Share [Abstract]
Net income (loss)	$ 25,596	$ 140,204	$ (836)	$ 262,845
Weighted average number of common shares outstanding	29,207	31,120	29,550	31,044
Dilutive stock awards	133	406	0	481
Diluted weighted average number of common shares outstanding	29,340	31,526	29,550	31,525
Basic earnings (loss) per share	$ 0.88	$ 4.51	$ (0.03)	$ 8.47
Diluted earnings (loss) per share	$ 0.87	$ 4.45	$ (0.03)	$ 8.34

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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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