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Share-Based Compensation And Capital Stock Summary Of Activity Related To Restricted Stock Grants (Details) (Restricted Stock [Member], USD $)
In Thousands, except Share data, unless otherwise specified
12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Restricted share grants 247,298 279,157 262,128
Weighted average grant date fair value per share $ 38.84 $ 33.07 $ 27.28
Aggregate grant date fair value ($000) $ 9,604 $ 9,233 $ 7,150
Restricted shares forfeited 68,580 41,796 43,408
Grant date fair value of shares vested ($000) $ 6,662 $ 6,222 $ 5,572
Minimum
     
Requisite service period 1 year 3 years 3 years
Maximum
     
Requisite service period 4 years 4 years 4 years