Retirement Plans and Other Postretirement Plans - Weighted Average Assumptions (Details 5)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Retirement Plans [Member]
Weighted-average assumptions used to determine benefit obligations
Assumed discount rate	4.00%	4.50%
Assumed salary increase rate	3.00%	3.00%
Weighted-average assumptions used to determine net periodic costs
Assumed discount rate for obligation	4.50%	5.50%
Assumed long-term rate of investment return	8.00%	8.00%
Assumed salary increase rate	3.00%	3.00%
Other Post Retirement Benefits [Member]
Weighted-average assumptions used to determine benefit obligations
Assumed discount rate	4.00%	4.50%
Assumed salary increase rate
Weighted-average assumptions used to determine net periodic costs
Assumed discount rate for obligation	4.50%	5.50%
Assumed long-term rate of investment return
Assumed salary increase rate