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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
	Mar. 31, 2013	Mar. 31, 2012
Earnings Per Share [Abstract]
Net income	$ 76,584	$ 62,664
Weighted average number of common shares outstanding	31,012	31,410
Dilutive stock awards	217	436
Diluted weighted average number of common shares outstanding	31,229	31,846
Basic earnings per share	$ 2.47	$ 2.00
Diluted earnings per share	$ 2.45	$ 1.97

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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