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Stock-Based Compensation (Summary Of RSUs Under The 2007 Plan) (Details) - 2007 and 2012 Incentive plan - Restricted stock units (RSUs) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Number of Shares [Roll Forward]      
RSUs outstanding, beginning balance (in shares) 750,000 725,000 733,000
Granted (in shares) 187,000 248,000 189,000
Released (in shares) (226,000) (212,000) (189,000)
Forfeited (in shares) (16,000) (11,000) (8,000)
RSUs outstanding, ending balance (in shares) 695,000 750,000 725,000
Expected to vest (in shares) 682,000 731,000 691,000
Weighted Average Price [Roll Forward]      
Beginning balance (usd per share) $ 84.67    
Granted (usd per share) 184.88    
Released (usd per share) 78.94    
Forfeited (usd per share) 84.20    
Ending balance (usd per share) $ 113.51 $ 84.67  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Additional Disclosures [Abstract]      
Ending balance, weighted average remaining contractual term (years) 1 year 5 months 12 days    
Expected to Vest, weighted average remaining contractual term (years) 1 year 5 months 4 days    
Ending balance, aggregate intrinsic value $ 127,856    
Expected to Vest, aggregate intrinsic value $ 125,203