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Repurchases Of Common Stock (Details)
$ / shares in Units, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2015
USD ($)
$ / shares
shares
Jun. 30, 2014
USD ($)
$ / shares
shares
Jun. 30, 2015
USD ($)
$ / shares
shares
Jun. 30, 2014
USD ($)
$ / shares
shares
Shares repurchased 1,415,000 1,947,000 3,133,000 3,099,000
Total cost of shares repurchased | $ $ 93,461 $ 126,347 $ 227,108 $ 196,626
Average cost per share | $ / shares $ 66.07 $ 64.88 $ 72.50 $ 63.45
Stock split     2  
Shares acquired through employee surrenders     64,000 84,000
Cost of shares acquired through employee surrenders | $     $ 5,100 $ 5,200
Shares of treasury stock issued     46,600,000  
Carrying value of treasury stock, issued | $     $ 1,500,000  
Prior To Stock Split [Member]        
Shares repurchased 890,000 973,000 1,749,000 1,549,000