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Summary Of Significant Accounting Policies (Calculation Of Basic And Diluted Earnings Per Share) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Accounting Policies [Abstract]
Basic earnings per common share, Income (Numerator)	$ 71,920	$ 49,965
Basic earnings per common share, Shares (Denominator)	172,598	176,348
Basic earnings per common share, Per Share Amount	$ 0.42	$ 0.28
Dilutive effect of stock options, Income (Numerator)	0	0
Dilutive effect of stock options, Shares (Denominator)	3,407	1,320
Diluted earnings per common share, Income (Numerator)	$ 71,920	$ 49,965
Diluted earnings per common share, Shares (Denominator)	176,005	177,668
Diluted earnings per common share, Per Share Amount	$ 0.41	$ 0.28

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