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Employee Benefit Plans (Details 17)	12 Months Ended
Employee Benefit Plans (Details 17)	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Pension Plan
Discount rate used to determine net periodic pension cost	4.39%	5.59%	6.00%
Discount rate used to calculate end of year liability disclosures	3.97%	4.39%	5.59%
Expected long-term rate of return on assets	7.75%	7.75%	7.75%
Rate of compensation increase	3.50%	5.00%	5.00%
SERP
Discount rate used to determine net periodic pension cost	4.39%	5.59%	6.00%
Discount rate used to calculate end of year liability disclosures	3.97%	4.39%	5.59%
Expected long-term rate of return on assets
Rate of compensation increase	3.50%	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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