Other Employee Benefit Plans Other Employee Benefit Plans (Details 2) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Pension and Other Postretirement Benefit Plans, Accumulated Other Comprehensive Income (Loss), before Tax [Abstract]
Net earnings (loss)	$ 500	$ (372)	$ 2,665
Prior service cost	161	160	296
Pension and Other Postretirement Benefit Plans, Accumulated Other Comprehensive Income (Loss), before Tax	661	(212)	$ 2,961
Pension and Other Postretirement Benefit Plans, Amounts that Will be Amortized from Accumulated Other Comprehensive Income (Loss) in Next Fiscal Year [Abstract]
Net loss	(1,708)	(2,208)
Prior service cost	(9)	(170)
Total recognized in AOCI	$ (1,717)	$ (2,378)