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Retirement Plans (Details 16) (Other Postretirement Benefit Plans, Defined Benefit [Member])	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Other Postretirement Benefit Plans, Defined Benefit [Member]
Weighted-average assumptions used to determine defined benefit pension obligations
Discount rates	3.60%	4.50%
Health care cost increase rate:
Following year	7.50%	8.00%
Decreasing to the year 2018	5.00%	5.00%

The assumed health care cost trend rate for the next year used to measure the expected cost of benefits covered by the plan (gross eligible charges). This is based upon the annual rate of change in the cost of health care benefits currently provided by the postretirement benefit plan, due to factors other than changes in the composition of the plan population by age and dependency status.

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