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Retirement Plans and Other Post-Retirement Benefits (Details 7)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Pension Benefits [Member]
Schedule of defined benefit plan weighted average assumptions used in calculating net periodic benefit cost
Discount rate-benefit expense	5.09%	5.81%	6.10%
Future compensation growth rate	4.00%	4.00%	4.00%
Expected long-term rate of return on plan assets	8.50%	8.50%	8.50%
Other Benefits [Member]
Schedule of defined benefit plan weighted average assumptions used in calculating net periodic benefit cost
Discount rate-benefit expense	4.45%	5.12%	5.90%
Expected long-term rate of return on plan assets	8.50%	8.50%	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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