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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		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Earnings Per Share [Abstract]
Net income	$ 87,853	$ 81,683	$ 164,437	$ 144,347
Weighted average number of common shares outstanding	30,901	31,696	30,956	31,553
Dilutive stock awards	275	255	246	346
Diluted weighted average number of common shares outstanding	31,176	31,951	31,202	31,899
Basic earnings per share	$ 2.84	$ 2.58	$ 5.31	$ 4.57
Diluted earnings per share	$ 2.82	$ 2.56	$ 5.27	$ 4.53

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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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