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Defined Benefit Pension and Other Post Retirement Plans (Details 2)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Weighted average assumptions used to determine net periodic benefit cost
Discount rate	4.69%	5.89%	6.18%
Expected long-term rate of return on assets	8.00%	8.00%	8.50%

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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