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Incentive Stock Plans Restricted Shares (Details) (Restricted Stock [Member], USD $)
In Millions, except Share data, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Restricted Stock [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Award vesting period one to three year period    
Unrecognized compensation cost $ 0.4    
Weighted average period for recognition (years) 8 months 12 days    
Restricted shares granted 18,742 20,535 42,180
Weighted average price of restricted shares granted $ 42.40 $ 43.55 $ 29.91
Intrinsic value of restricted stock outstanding 2.1 [1] 3.4 [1] 4.9 [1]
Fair value of restricted stock vested 1.8 2.6 3.2
Cash used to pay the minimum witholding tax requirements in lieu of receiving common shares $ 0.6 $ 0.8 $ 0.8
Non-vested number of Restricted Shares at January 1, 76,185    
Number of shares vested (53,405)    
Number of shares cancelled (950)    
Non-vested number of Restricted Shares at December 31, 40,572 76,185  
Weighted average grant date fair value of non-vested Restricted Shares at January 1, $ 33.55    
Weighted average grant date fair value of shares vested $ 33.73    
Weighted average grant date fair value of shares cancelled $ 35.55    
Weighted average grant date fair value of non-vested Restricted Shares at December 31, $ 37.36 $ 33.55  
[1] Intrinsic value of restricted stock outstanding is based on the market price of the Company's stock at December 31, 2012.