Other Employee Benefit Plans Other Employee Benefit Plans (Details 5) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]
Service costs	$ 205	$ 142	$ 125
Interest costs	1,047	1,135	1,085
Net amortization and deferral	903	967	1,045
Settlement loss	0	1,392	0
Net periodic pension costs	2,155	3,636	2,255
Pension and Other Postretirement Benefit Plans, Amounts that Will be Amortized from Accumulated Other Comprehensive Income (Loss) in Next Fiscal Year [Abstract]
Net loss	445
Net prior service cost	297
Pension and Other Postretirement Benefit Plans, Amounts that Will be Amortized from Accumulated Other Comprehensive Income (Loss) in Next Fiscal Year	$ 742