Pension and Other Post-Retirement Benefits Actual Asset Allocation (Details)	Dec. 31, 2012 Rate	Dec. 31, 2011 Rate
Other Postretirement Benefit Plans, Defined Benefit [Member]
Acutal Asset Allocation [Line Items]
Actual Equity Allocation	65.00%	63.00%
Actual Fixed Income Allocation	35.00%	37.00%
Total Actual Asset Allocation	100.00%	100.00%
Pension Plans, Defined Benefit [Member]
Acutal Asset Allocation [Line Items]
Actual Equity Allocation	64.00%	66.00%
Actual Fixed Income Allocation	36.00%	34.00%
Total Actual Asset Allocation	100.00%	100.00%