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Employee Benefit Plans Health Trends (Details) (Other Postretirement Benefit Plans, Defined Benefit [Member], USD $)	12 Months Ended
	Dec. 31, 2011
Other Postretirement Benefit Plans, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Health Care Cost Trend Rate Assumed for Next Fiscal Year	8.00%
Defined Benefit Plan, Ultimate Health Care Cost Trend Rate	5.50%
Defined Benefit Plan, Effect of One Percentage Point Decrease on Service and Interest Cost Components	$ 74,000
Defined Benefit Plan, Effect of One Percentage Point Increase on Accumulated Postretirement Benefit Obligation	1,200,000
Defined Benefit Plan, Effect of One Percentage Point Increase on Service and Interest Cost Components	91,000
Defined Benefit Plan, Effect of One Percentage Point Decrease on Accumulated Postretirement Benefit Obligation	$ 1,000,000

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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