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Earnings Per Share (Basic and Diluted Earnings) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Earnings Per Share [Abstract]
Net income	$ 83,379	$ 72,300	$ 247,816	$ 216,647
Weighted average number of common shares outstanding	30,897	31,643	30,937	31,583
Dilutive stock awards	399	203	297	298
Diluted weighted average number of common shares outstanding	31,296	31,846	31,234	31,881
Basic earnings per share	$ 2.70	$ 2.28	$ 8.01	$ 6.86
Diluted earnings per share	$ 2.66	$ 2.27	$ 7.93	$ 6.80

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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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