Other Employee Benefit Plans Other Employee Benefit Plans (Details 5) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]
Service costs	$ 156	$ 166	$ 254
Interest costs	353	444	883
Net amortization and deferral	513	279	1,111
Settlement loss	0	163	3,305
Net periodic pension costs	1,022	$ 1,052	$ 5,553
Defined Benefit Plan, Amount to be Amortized from Accumulated Other Comprehensive Income (Loss) Next Fiscal Year [Abstract]
Net loss	148
Net prior service cost	24
Pension and Other Postretirement Benefit Plans, Amounts that Will be Amortized from Accumulated Other Comprehensive Income (Loss) in Next Fiscal Year	$ 172