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Summary of Significant Accounting Policies (Calculation Of Basic And Diluted Earnings Per Share) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Accounting Policies [Abstract]
Basic earnings per common share, Income (Numerator)	$ 79,425	$ 83,983	$ 250,276	$ 241,616
Shares used to compute basic earnings per share	165,579	167,925	166,142	168,612
Basic earnings per common share	$ 0.48	$ 0.50	$ 1.51	$ 1.43
Dilutive effect of stock options, income	$ 0	$ 0	$ 0	$ 0
Dilutive effect of stock options, shares	3,676	4,980	3,835	5,088
Diluted earnings per common share, Income (Numerator)	$ 79,425	$ 83,983	$ 250,276	$ 241,616
Shares used to compute diluted earnings per share	169,255	172,905	169,977	173,700
Diluted earnings per common share	$ 0.47	$ 0.49	$ 1.47	$ 1.39

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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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