Other Employee Benefit Plans Other Employee Benefit Plans (Details 2) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Pension and Other Postretirement Benefit Plans, Accumulated Other Comprehensive Income (Loss), before Tax [Abstract]
Net earnings (loss)	$ 448	$ (1,410)	$ 396
Prior service cost	297	297	297
Transition obligation	0	0	(29)
Pension and Other Postretirement Benefit Plans, Accumulated Other Comprehensive Income (Loss), before Tax	745	(1,113)	664
Pension and Other Postretirement Benefit Plans, Amounts that Will be Amortized from Accumulated Other Comprehensive Income (Loss) in Next Fiscal Year [Abstract]
Net loss	(4,501)	(4,949)
Prior service cost	(626)	(923)
Total recognized in AOCI	$ (5,127)	$ (5,872)