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Benefit Plans (Actuarial Assumptions for Net Cost or Benefit) (Details)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Pension Plans, Defined Benefit [Member]
Discount rate	4.60%	5.375%	5.70%
Expected long term rate of return	8.00%	8.00%	8.00%
Rate of compensation increases	4.125%	5.03%	5.03%
Other Postretirement Benefit Plans, Defined Benefit [Member]
Discount rate	3.75%	4.375%
Discount Rate			4.875 / 5.500%

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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