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Share-Based Compensation (Schedule Of Stock Option Activity) (Details)
$ / shares in Units, shares in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2015
USD ($)
$ / shares
shares
Share-Based Compensation [Abstract]  
Outstanding as of December 31, 2014 | shares 3,560
Granted | shares 611
Exercised | shares (675)
Forfeited | shares (112)
Outstanding as of December 31, 2015 | shares 3,384
Fully vested as of December 31, 2015 | shares 1,748
Fully vested and expected to vest as of December 31, 2015 | shares 3,276
Weighted average exercise price of beginning balance of options outstanding | $ / shares $ 40.08
Weighted average exercise price of options granted | $ / shares 78.08
Weighted average exercise price of options exercised | $ / shares 23.65
Weighted average exercise price of options forfeited | $ / shares 53.64
Weighted average exercise price of ending balance of options outstanding | $ / shares 49.76
Weighted average exercise price of options fully vested | $ / shares 39.67
Weighted average exercise price of options fully vested and expected to vest | $ / shares $ 49.41
Weighted average remaining contractual term of ending balance of options outstanding 4 years 9 months 18 days
Weighted average remaining contractual term of options fully vested 3 years
Weighted average remaining contractual term of options fully vested and expected to vest 4 years 8 months 12 days
Aggregate Intrinsic Value | $ $ 81,936
Aggregate intrinsic value of options fully vested | $ 58,132
Aggregate intrinsic value of options expected to vest | $ $ 80,453