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Stock Compensation Plans (Details 3) (Performance Share Units [Member], USD $)
In Thousands, except Per Share data, unless otherwise specified
12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Performance Share Units [Member]
     
Summary of nonvested performance share units      
Nonvested Shares at January 1, 2011 124    
Nonvested Shares, Granted 77    
Nonvested Shares, Forfeited (36)    
Nonvested Shares at December 31, 2011 165 124  
Nonvested Shares, Weighted-Average Grant-Date Fair Value at January 1, 2011 $ 26.90    
Nonvested Shares, Weighted-Average Grant-Date Fair Value, Granted $ 47.80 $ 32.69 $ 10.81
Nonvested Shares, Weighted-Average Grant-Date Fair Value, Forfeited $ 44.97    
Nonvested Shares, Weighted-Average Grant-Date Fair Value at December 31, 2011 $ 32.73 $ 26.90