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Benefit Plans Benefit Plans - Health Care Cost Trends (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010
Defined Benefit Plan, Assumed Health Care Cost Trend Rates [Abstract]
Healthcare cost trend rate assumed for next year	8.00%	7.40%
Rate to which the cost trend rate is assumed to decline (the ultimate trend rate)	4.20%	4.20%
Defined Benefit Plan, Effect of One-Percentage Point Change in Assumed Health Care Cost Trend Rates [Abstract]
Effect on total of service and interest cost, One Percentage-Point Increase	$ 58
Effect on total of service and interest cost, One Percentage-Point Decrease	(52)
Effect on postretirement benefit obligation, One Percentage-Point Increase	1,010
Effect on postretirement benefit obligation, One Percentage-Point Decrease	$ (914)

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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