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Employee Benefits (Details 5)	12 Months Ended
Employee Benefits (Details 5)	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Pension Benefits [Member]
Weighted average assumptions used to determine net pension and other postretirement benefit costs [Abstract]
Discount rate	5.75%	6.00%	6.00%
Rate of compensation increase	4.50%	4.50%	4.50%
Expected long term rate of return on plan assets	7.75%	8.00%	8.00%
Other Postretirement Benefits [Member]
Weighted average assumptions used to determine net pension and other postretirement benefit costs [Abstract]
Discount rate	5.75%	6.00%	6.00%
Rate of compensation increase	0.00%	0.00%	0.00%
Expected long term rate of return on plan assets	7.75%	8.00%	8.00%

An assumption as to the rate of return on plan assets reflecting the average rate of earnings expected on the funds invested or to be invested to provide for the benefits included in the benefit obligation.

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