Pension and Other Post Retirement Benefit Plans Pension and Other Post Retirement Benefit Plans - Schedule of Weighted Average Assumptions Used to Determine Benefit Obligation and Benefit Cost (Details)	12 Months Ended
Dec. 31, 2012	Dec. 31, 2011
Weighted-average Assumptions Used to Determine Benefit Obligation:
Discount Rate	4.00%	4.50%
Rate of Compensation Increase for accruing active participants	3.00%	4.00%
Weighted-average Assumptions Used to Determine Benefit Cost:
Discount Rate	4.50%	5.40%
Expected Return on Plan Assets	7.00%	7.00%
Rate of Compensation Increase for accruing active participants	4.00%	4.00%

Pension and Other Post Retirement Benefit Plans Pension and Other Post Retirement Benefit Plans - Schedule of Weighted Average Assumptions Used to Determine Benefit Obligation and Benefit Cost (Details)

12 Months Ended

Dec. 31, 2012

Dec. 31, 2011

Weighted-average Assumptions Used to Determine Benefit Obligation:

Discount Rate

4.00%

4.50%

Rate of Compensation Increase for accruing active participants

3.00%

4.00%

Weighted-average Assumptions Used to Determine Benefit Cost:

Discount Rate

4.50%

5.40%

Expected Return on Plan Assets

7.00%

Rate of Compensation Increase for accruing active participants

4.00%

- Definition

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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