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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
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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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- Definition 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). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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