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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, 2014	Mar. 31, 2013
Accounting Policies [Abstract]
Basic earnings per common share, Income (Numerator)	$ 74,820	$ 71,920
Shares used to compute basic earnings per share	169,306	172,598
Basic earnings per common share	$ 0.44	$ 0.42
Dilutive effect of stock options, income	0	0
Dilutive effect of stock options, shares	4,522	3,407
Diluted earnings per common share, Income (Numerator)	$ 74,820	$ 71,920
Shares used to compute diluted earnings per share	173,828	176,005
Diluted earnings per common share	$ 0.43	$ 0.41

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Amount of increase (decrease) to net income used for calculating diluted earnings per share (EPS), resulting from the assumed exercise of stock options or restrictive stock units (RSUs).

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