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Employee Benefit Plans - Components of Net Periodic Benefit Cost (Details) - Post-employment benefits - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Service cost $ 22 $ 25 $ 36
Interest cost 100 122 142
Amortization of unrecognized prior service cost (37) (339) (338)
Amortization of unrecognized net actuarial loss 92 184 269
Net benefit cost (credit) $ 177 $ (8) $ 109