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Employee Benefit Plans (Details 3)	12 Months Ended
Employee Benefit Plans (Details 3)	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Defined Benefit Pension Plan [Member]
Assumptions used to determine net periodic benefit cost
Discount rate (in hundredths)	5.51%	5.91%	6.25%
Rate of compensation increase (in hundredths)	4.00%	4.00%	5.75%
Long-term rate of return on plan assets (in hundredths)	8.00%	8.25%	8.25%
Supplementary Pension Plan [Member]
Assumptions used to determine net periodic benefit cost
Discount rate (in hundredths)	5.36%	5.95%	6.25%
Rate of compensation increase (in hundredths)	4.00%	4.00%	4.00%

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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