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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, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Earnings Per Share [Abstract]
Net income	$ 144,883	$ 130,801	$ 407,728	$ 324,140
Weighted average number of common shares outstanding	31,187	31,020	31,115	31,043
Dilutive stock awards	361	527	441	459
Diluted weighted average number of common shares outstanding	31,548	31,547	31,556	31,502
Basic earnings per share	$ 4.65	$ 4.22	$ 13.10	$ 10.44
Diluted earnings per share	$ 4.59	$ 4.15	$ 12.92	$ 10.29

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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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