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Pension and Other Postretirement Benefits (Details 12) (Other postretirement benefit plans [Member], USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010
Other postretirement benefit plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Ultimate health care cost trend rate	4.50%
Health care cost trend rate assumed	7.60%	7.60%
Defined Benefit Plan, Effect of One-Percentage Point Change in Assumed Health Care Cost Trend Rates [Abstract]
One Percentage Point Increase, Effect on postretirement benefit oblilgation	$ 873
One Percentage Point Decrease, Effect on postretirement benefit oblilgation	(776)
One Percentage Point Increase, Effect on postretirement benefit cost	43
One Percentage Point Decrease, Effect on postretirement benefit cost	$ (39)

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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