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Repurchases Of Common Stock (Details)
$ / shares in Units, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2015
USD ($)
$ / shares
shares
Sep. 30, 2014
USD ($)
$ / shares
shares
Sep. 30, 2015
USD ($)
$ / shares
shares
Sep. 30, 2014
USD ($)
$ / shares
shares
Shares repurchased 1,213,000 4,393,000 4,345,000 7,492,000
Total cost of shares repurchased | $ $ 85,975 $ 272,342 $ 313,083 $ 468,968
Average cost per share | $ / shares $ 70.89 $ 61.99 $ 72.05 $ 62.59
Stock split     2  
Shares acquired through employee surrenders     66,000 85,000
Cost of shares acquired through employee surrenders | $     $ 5,200 $ 5,300
Shares of treasury stock issued     46,600,000  
Carrying value of treasury stock, issued | $     $ 1,500,000  
Prior To Stock Split [Member]        
Shares repurchased   2,197,000 2,962,000 3,746,000