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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
	Mar. 31, 2016	Mar. 31, 2015
Accounting Policies [Abstract]
Basic earnings per common share, Income (Numerator)	$ 77,497	$ 84,611
Shares used to compute basic earnings per share	163,013	166,695
Basic earnings per common share	$ 0.48	$ 0.51
Dilutive effect of stock options, income	$ 0	$ 0
Dilutive effect of stock options, shares	3,132	4,008
Diluted earnings per common share, Income (Numerator)	$ 77,497	$ 84,611
Shares used to compute diluted earnings per share	166,145	170,703
Diluted earnings per common share	$ 0.47	$ 0.50

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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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