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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, 2017
Dec. 31, 2016
Dec. 31, 2015
Shares      
Restricted Stock Units outstanding, December 31, 2016 695,000 750,000 725,000
Granted 154,000 187,000 248,000
Released (284,000) (226,000) (212,000)
Forfeited (10,000) (16,000) (11,000)
Restricted Stock Units outstanding, December 31, 2017 555,000 695,000 750,000
Expected to vest as of December 31, 2017 546,000 682,000 731,000
Weighted average grant date fair value      
Restricted Stock Units outstanding, December 31, 2016 $ 113.51    
Granted 226.91    
Released 106.30    
Forfeited 190.53    
Restricted Stock Units outstanding, December 31, 2017 $ 147.28 $ 113.51  
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 1 month 6 days    
Expected to vest, weighted average remaining contractual term (years) 1 year 1 month 6 days    
Ending balance, aggregate intrinsic value $ 152,017    
Expected to vest, aggregate intrinsic value $ 146,650