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Employees, Retirement and Incentive Plans Restricted Units (Details) (USD $)
12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Restricted Stock Units (RSUs) [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward]      
Outstanding at January 1, 2011 (not vested) 47,295    
Granted 24,650    
Vesting and transfer of full ownership to recipients (34,607)    
Forfeited (7,802)    
Outstanding at December 31, 2011 (not vested) 29,536    
Weighted Average Grant-Date Fair Value      
Restricted units (not vested) $ 50.45 $ 37.47  
Restricted units granted $ 58.09    
Restricted units, vesting and transfer of full ownership to recipients $ 39.67    
Restricted units forfeited $ 43.71    
Restricted units, aggregate intrinsic value $ 1,557,000    
Share-based Compensation Arrangement by Share-based Payment Award, Restricted Units, Outstanding, Weighted Average Remaining Contractual Term 1 year    
Minimum [Member]
     
Weighted Average Grant-Date Fair Value      
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 1 year    
Maximum [Member]
     
Weighted Average Grant-Date Fair Value      
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 5 years    
Long-term Incentive Plan [Member] | Restricted Stock Units (RSUs) [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Total Fair Value 1,400,000 1,600,000 1,200,000
Weighted Average Grant-Date Fair Value      
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized $ 500,000