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Stock-Based Compensation (Summary Of Stock Options) (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended
Mar. 31, 2012
Y
Stock-Based Compensation [Abstract]  
Number of Options, Outstanding, Beginning balance 4,525
Number of Options, Granted 417
Number of Options, Exercised (116)
Number of Options, Forfeited or expired (89)
Number of Options, Outstanding, Ending balance 4,737
Number of Options, Exercisable as of March 31, 2012 3,665
Weighted-Average Exercise Price, Outstanding, Beginning balance $ 19.69
Weighted-Average Exercise Price, Granted $ 15.80
Weighted-Average Exercise Price, Exercised $ 11.81
Weighted-Average Exercise Price, Forfeited or expired $ 18.70
Weighted-Average Exercise Price, Outstanding, Ending balance $ 19.56
Weighted-Average Exercise Price, Exercisable as of March 31, 2012 $ 20.52
Weighted-Average Remaining Contractual Term (Years), Outstanding, Beginning Balance 5.05
Weighted-Average Remaining Contractual Term (Years), Outstanding, Ending Balance 5.26
Weighted-Average Remaining Contractual Term (Years), Exercisable as of March 31, 2012 4.28
Aggregate Intrinsic Value, Outstanding, Ending Balance $ 3,495
Aggregate Intrinsic Value, Exercisable, Ending Balance $ 2,304