Other Employee Benefit Plans Other Employee Benefit Plans (Details 5) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]
Service costs	$ 267	$ 205	$ 142
Interest costs	936	1,047	1,135
Net amortization and deferral	1,205	903	967
Settlement loss	0	0	1,392
Net periodic pension costs	2,408	2,155	3,636
Pension and Other Postretirement Benefit Plans, Amounts that Will be Amortized from Accumulated Other Comprehensive Income (Loss) in Next Fiscal Year [Abstract]
Net loss	399
Net prior service cost	290
Pension and Other Postretirement Benefit Plans, Amounts that Will be Amortized from Accumulated Other Comprehensive Income (Loss) in Next Fiscal Year	$ 689