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Employee Benefit Plans (Details 5)
 12 Months Ended
Dec. 31, 2012
Expected Long-Term Return on Class 10.00%
Assumption 7.30%
Fixed Income Funds [Member]
  
X Allocation 50.00%
Equity Securities [Member]
  
X Allocation 34.00%
Foreign Equity Securities [Member]
  
X Allocation 16.00%
Minimum [Member]
  
Assumption 4.00%
Minimum [Member] | Fixed Income Funds [Member]
  
Expected Long-Term Return on Class 3.00%
Assumption 1.50%
Minimum [Member] | Equity Securities [Member]
  
Expected Long-Term Return on Class 5.00%
Assumption 1.70%
Minimum [Member] | Foreign Equity Securities [Member]
  
Expected Long-Term Return on Class 5.00%
Assumption 0.80%
Maximum [Member]
  
Assumption 7.30%
Maximum [Member] | Fixed Income Funds [Member]
  
Expected Long-Term Return on Class 5.00%
Assumption 2.50%
Maximum [Member] | Equity Securities [Member]
  
Expected Long-Term Return on Class 9.00%
Assumption 3.10%
Maximum [Member] | Foreign Equity Securities [Member]
  
Expected Long-Term Return on Class 10.00%
Assumption 1.70%