Other Employee Benefits Long-Term Disability (Details) (Long term disability [Member], USD $)	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Long term disability [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Net Periodic Benefit Cost	$ 6,439	$ 3,294	$ 3,642
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate	4.04%	4.72%	5.90%
Defined Benefit Plan, Benefit Obligation	$ 35,638	$ 36,233