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Stock-based Compensation (Schedule Of Restricted Stock) (Details)
shares in Thousands
9 Months Ended
Sep. 30, 2015
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award  
Number of restricted stock units granted to employees (in shares) 1,300
Weighted-average grant date fair value (in dollars per share) | $ / shares $ 39.77
Time-based Restricted Stock Units  
Share-based Compensation Arrangement by Share-based Payment Award  
Number of restricted stock units granted to employees (in shares) 931
Performance-based Restricted Stock Units  
Share-based Compensation Arrangement by Share-based Payment Award  
Number of restricted stock units granted to employees (in shares) 246 [1]
Market-based Restricted Stock Units  
Share-based Compensation Arrangement by Share-based Payment Award  
Number of restricted stock units granted to employees (in shares) 123 [1]
[1] *Assumes grant date expected payout