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Share-Based Compensation And Capital Stock Summary Of Activity Related To Restricted Stock Grants (Details) (Restricted Stock, USD $)
In Thousands, except Share data, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Granted - Shares 266,159 247,298 279,157
Weighted average grant date fair value per share $ 35.76 $ 38.84 $ 33.07
Aggregate grant date fair value ($000) $ 9,517 $ 9,604 $ 9,233
Restricted shares forfeited 26,824 68,580 41,796
Grant date fair value of shares vested ($000) $ 6,696 $ 6,662 $ 6,222
Minimum
     
Vesting service period of shares granted 12 months 1 year 3 years
Maximum
     
Vesting service period of shares granted 68 months 4 years 4 years