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Retirement Plan (Weighted Average Assumptions Used to Determine Net Periodic Benefit Expense) (Details)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Pension and Other Postretirement Benefit Expense [Abstract]
Discount rate	4.60%	5.65%	6.20%
Rate of future compensation increases	4.00%	4.00%	4.00%
Expected long-term rate of return on assets	6.50%	8.00%	8.50%

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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