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Share-Based Compensation And Benefit Plans (Summary Of Stock Option Activity) (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
 12 Months Ended
Dec. 31, 2011
Share-Based Compensation And Benefit Plans [Abstract]  
Options, Outstanding beginning balance 493,000
Options, Granted 70,000
Options, Exercised (126,100)
Options, Forfeited (34,000)
Options, Expired (17,750)
Options, Outstanding ending balance 385,150
Options, Exercisable 150,734
Weighted-Average Exercise Price, Outstanding beginning balance $ 43.80
Weighted-Average Exercise Price, Granted $ 62.75
Weighted-Average Exercise Price, Exercised $ 37.46
Weighted-Average Exercise Price, Forfeited $ 49.92
Weighted-Average Exercise Price, Expired $ 64.56
Weighted-Average Exercise Price, Outstanding ending balance $ 47.82
Weighted-Average Exercise Price, Exercisable $ 34.30
Weighted-Average Remaining Contractual Term (in years), Outstanding 2.76
Weighted-Average Remaining Contractual Term (in years), Exercisable 1.54
Aggregate Intrinsic Value, Outstanding $ 6,892
Aggregate Intrinsic Value, Exercisable $ 4,727