Other Employee Benefit Plans (Details 5) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]
Service costs	$ 0	$ 156	$ 166
Interest costs	397	353	444
Net amortization and deferral	260	513	279
Settlement loss	0	0	163
Net periodic pension costs	657	$ 1,022	$ 1,052
Defined Benefit Plan, Amount to be Amortized from Accumulated Other Comprehensive Income (Loss) Next Fiscal Year [Abstract]
Net loss	155
Net prior service cost	0
Pension and Other Postretirement Benefit Plans, Amounts that Will be Amortized from Accumulated Other Comprehensive Income (Loss) in Next Fiscal Year	$ 155