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Retirement Plans (Details) - Assumptions used (Defined benefit plan)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Defined benefit plan
Net benefit cost - weighted average assumptions:
Discount rate	4.40%	5.60%
Expected long-term rate of return on plan assets	8.00%	8.00%
Benefit obligation - weighted average assumptions:
Discount rate	4.00%	4.40%

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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