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Repurchases Of Common Stock (Schedule Of Common Stock Repurchases) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands | 3 Months Ended | 6 Months Ended
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Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Equity [Abstract] |  |  |  |
Shares repurchased in the open market (in shares) | 517 | 696 | 982 | 1,086
Shares acquired through employee surrender for statutory tax withholding (in shares) | 1 | 1 | 49 | 53
Total shares repurchased (in shares) | 518 | 697 | 1,031 | 1,139
Cost of shares repurchased in the open market | $ 105,774 | $ 114,163 | $ 191,962 | $ 164,907
Cost of shares for employee surrenders | 165 | 156 | 8,720 | 7,459
Total cost of shares | $ 105,939 | $ 114,319 | $ 200,682 | $ 172,366
Average cost per share - open market repurchases (in dollars per share) | $ 204.69 | $ 163.96 | $ 195.47 | $ 151.81
Average cost per share - employee surrenders (in dollars per share) | 215.36 | 168.25 | 179.41 | 141.56
Average cost per share - total (in dollars per share) | $ 204.71 | $ 163.97 | $ 194.71 | $ 151.34

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- Definition Open market common stock repurchases. + References No definition available. + Details
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- Definition The amount of adjustment to stockholders' equity associated with an employee's income tax withholding obligation as part of a net-share settlement of a share-based award. + References No definition available. + Details
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- Definition For net-share settlement of share-based awards when the employer settles employees' income tax withholding obligations, this element represents the number of shares the employees use to repay the employer. + References No definition available. + Details
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- Definition Total cost of shares repurchased divided by the total number of shares repurchased. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6405813&loc=d3e23239-112655 + Details
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