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Earnings Per Share (Basic and Diluted Earnings) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Earnings Per Share [Abstract]
Net income	$ 43,793	$ 19,610	$ 66,730	$ 46,120	$ 15,975	$ 7,799	$ 25,596	$ (26,432)	$ 176,253	$ 22,938	$ 475,602
Weighted average number of common shares outstanding									28,491	29,265	31,092
Dilutive stock awards									70	505	402
Diluted weighted average number of common shares outstanding									28,561	29,770	31,494
Basic earnings (loss) per share	$ 1.56	$ 0.69	$ 2.33	$ 1.60	$ 0.55	$ 0.27	$ 0.88	$ (0.88)	$ 6.19	$ 0.78	$ 15.30
Diluted earnings (loss) per share	$ 1.55	$ 0.69	$ 2.32	$ 1.60	$ 0.55	$ 0.27	$ 0.87	$ (0.88)	$ 6.17	$ 0.77	$ 15.10

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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