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Repurchases Of Common Stock (Details) (USD $)
 3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Repurchases Of Common Stock [Abstract]        
Shares repurchased 973,000 1,651,000 1,549,000 2,338,000
Total cost of shares repurchased $ 126,347,000 $ 142,557,000 $ 196,626,000 $ 206,335,000
Average cost per share $ 129.77 $ 86.37 $ 126.90 $ 88.27
Shares acquired through employee surrenders     41,884 46,745
Cost of shares acquired through employee surrenders     $ 5,200,000 $ 4,300,000