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Earnings Per Share (Basic and Diluted Earnings) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Earnings Per Share [Abstract]
Net income	$ 19,610	$ 7,799	$ 132,460	$ 6,963
Weighted average number of common shares outstanding	28,415	29,063	28,604	29,387
Dilutive stock awards	24	108	92	405
Diluted weighted average number of common shares outstanding	28,439	29,171	28,696	29,792
Basic earnings per share	$ 0.69	$ 0.27	$ 4.63	$ 0.24
Diluted earnings per share	$ 0.69	$ 0.27	$ 4.62	$ 0.23

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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The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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