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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
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