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Earnings Per Share (Basic and Diluted Earnings Per Share) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Earnings Per Share [Abstract]
Net income	$ 46,884	$ 66,730	$ 106,330	$ 112,850
Weighted-average number of common shares outstanding	27,819	28,649	27,865	28,699
Dilutive stock awards	116	151	77	126
Diluted weighted-average number of common shares outstanding	27,935	28,800	27,942	28,825
Basic earnings per share	$ 1.69	$ 2.33	$ 3.82	$ 3.93
Diluted earnings per share	$ 1.68	$ 2.32	$ 3.81	$ 3.92

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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