Employee Benefits Plan Weighted Assumptions (Details)	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010
Supplemental Employee Retirement Plans, Defined Benefit [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Discount Rate	5.50%	5.81%
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate	4.52%	5.50%
Other Pension Plans, Defined Benefit [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Discount Rate	5.33%	5.81%
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate	4.57%	5.33%