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Stock-Based Compensation (Summary Of Stock Option Activity) (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Stock-Based Compensation [Abstract]      
Shares Under Option, Outstanding 1,875,170 2,388,684 2,475,015
Weighted-Average Exercise Price, Outstanding $ 17.53 $ 17.03 $ 16.68
Weighted-Average Remaining Contractual Term (in years), Outstanding 5.40 6.10 6.90
Aggregate Intrinsic Value, Outstanding $ 17,147 $ 21,629 $ 22,587
Shares Under Option, Exercised (52,589) (313,514) (69,659)
Weighted-Average Exercise Price, Exercised $ 18.48 $ 13.13 $ 4.84
Shares Under Option, Forfeited (438,044) (200,000) (16,672)
Weighted-Average Exercise Price, Forfeited $ 17.28 $ 18.48 $ 15.40
Shares Under Option, Outstanding 1,384,537 1,875,170 2,388,684
Weighted-Average Exercise Price, Outstanding $ 17.58 $ 17.53 $ 17.03
Weighted-Average Remaining Contractual Term (in years), Outstanding 4.40 5.40 6.10
Aggregate Intrinsic Value, Outstanding 14,587 17,147 21,629
Shares Under Option, vested and expected to vest 1,384,537    
Weighted-Average Exercise Price, vested and expected to vest $ 17.58    
Weighted-Average Remaining Contractual Term, vested and expected to vest 4.40    
Aggregate Intrinsic Value, vested and expected to vest 14,587    
Shares Under Option, Exercisable 396,985 257,040 317,020
Weighted-Average Exercise Price, Exercisable $ 18.16 $ 17.92 $ 12.68
Weighted-Average Remaining Contractual Term, Exercisable 5.40 6.00 2.40
Aggregate Intrinsic Value, Exercisable $ 1,774 $ 1,546 $ 1,676