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Employee Benefit Plans (Details 7)	12 Months Ended
Employee Benefit Plans (Details 7)	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Pension Plan [Member]
Weighted-average assumptions to determine net periodic cost
Discount rate	5.50%	5.99%	5.96%
Rate of compensation increase	4.50%	4.50%	4.00%
Expected long term rate of return on assets	8.00%	8.50%	8.50%
SERP [Member]
Weighted-average assumptions to determine net periodic cost
Discount rate	4.75%	6.00%	6.00%
Rate of compensation increase	4.00%	5.00%	5.00%

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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