Defined Benefit Pension Plans Actuarial Assumptions (Details)	12 Months Ended
	Dec. 31, 2012 Rate	Dec. 31, 2011 Rate	Dec. 31, 2010 Rate
Defined Benefit Plan Disclosure [Line Items]
Discount rate	4.25%	5.25%	6.00%
Expected long-term rate of return on plan assets	7.75%	7.75%	8.00%
Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, target plan asset allocations range minimum	60.00%
Defined benefit plan, target plan asset allocations range maximum	70.00%
Fixed Income and Cash [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, target plan asset allocations range minimum	20.00%
Defined benefit plan, target plan asset allocations range maximum	30.00%
Alternative Investments [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, target plan asset allocations range minimum	0.00%
Defined benefit plan, target plan asset allocations range maximum	10.00%
Minimum [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Risk Management Practices, Investment Evaluation Period	3 years
Maximum [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Risk Management Practices, Investment Evaluation Period	5 years