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Pension and Employee Benefit Plans (Details 3)
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Details of defined benefit pension plan asset allocation by asset category    
Target allocation 100.00%  
Percentage of plan asset 100.00% 100.00%
Equity Securities [Member]
   
Details of defined benefit pension plan asset allocation by asset category    
Target allocation 70.00%  
Percentage of plan asset 69.00% 61.00%
Debt Securities [Member]
   
Details of defined benefit pension plan asset allocation by asset category    
Target allocation 30.00%  
Percentage of plan asset 31.00% 39.00%