Stock Plans (Summary Of Activity Of Stock Options Under All Plans) (Details) (USD $) In Thousands, except Share data, unless otherwise specified	6 Months Ended
	Jun. 30, 2012
Stock Plans [Abstract]
Balance at December 31, 2011, Shares	2,865,390
Granted, Shares	443,996
Exercised, Shares	(197,320)
Forfeited or expired, Shares	(390,875)
Outstanding at June 30, 2012, Shares	2,721,191
Exercisable at June 30, 2012, Shares	1,092,820
Balance at December 31, 2011, Wtd. Avg. Exercise Price	$ 15.73
Granted, Wtd. Avg. Exercise Price	$ 28.80
Exercised, Wtd. Avg. Exercise Price	$ 14.99
Forfeited or expired, Wtd. Avg. Exercise Price	$ 34.75
Outstanding at June 30, 2012, Wtd. Avg. Exercise Price	$ 15.19
Exercisable at June 30, 2012, Wtd. Avg. Exercise Price	$ 14.26
Outstanding at June 30, 2012, Wtd. Avg. remaining contractual life in years	6 years 4 months 13 days
Exercisable at June 30, 2012, Wtd. Avg. remaining contractual life in years	4 years 3 months 26 days
Exercised, Aggregate Intrinsic Value	$ 2,905
Outstanding at June 30, 2012, Aggregate Intrinsic Value	37,957
Exercisable at June 30, 2012, Aggregate Intrinsic Value	$ 16,297