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Employee Benefit Plans (Target Allocation Percentages) (Details) (Pension Plans [Member])
12 Months Ended
Dec. 31, 2011
US Equity [Member]
 
Minimum 23.50%
Maximum 35.00%
Foreign Equity [Member]
 
Minimum 23.50%
Maximum 35.00%
Fixed Income [Member]
 
Minimum 33.00%
Maximum 45.00%
Commodity [Member]
 
Minimum 2.00%
Maximum 8.00%