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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, 2019
Dec. 31, 2018
Dec. 31, 2017
Shares      
Restricted Stock Units outstanding, beginning balance (in shares) 446,000 555,000 695,000
Granted (in shares) 187,000 136,000 154,000
Released (in shares) (230,000) (235,000) (284,000)
Forfeited (in shares) (41,000) (10,000) (10,000)
Restricted Stock Units outstanding, ending balance (in shares) 362,000 446,000 555,000
Expected to vest as of December 31, 2018 (in shares) 356,000 440,000 546,000
Weighted average grant date fair value      
Restricted Stock Units outstanding, beginning balance (usd per share) $ 166.56    
Granted (usd per share) 137.30    
Released (usd per share) 152.00    
Forfeited (usd per share) 189.23    
Restricted Stock Units outstanding, ending balance (usd per share) $ 158.13 $ 166.56  
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 3 months 18 days    
Expected to vest, weighted average remaining contractual term (years) 1 year 3 months 18 days    
Ending balance, aggregate intrinsic value $ 48,914    
Expected to vest, aggregate intrinsic value $ 48,060