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Employee Benefit Plans - Other changes in the plan assets and benefit obligation (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Other changes recognized in accumulated other comprehensive income (loss)      
Pension liability, beginning of year $ 8,450 $ 2,750  
Plan change   1,276 $ 506
Net prior service cost (179) (140)  
Net loss 875 4,564 2,244
Pension liability, end of year 9,146 $ 8,450 $ 2,750
Amortization into next prior service cost over the next fiscal year 200    
Amortization of actuarial loss over the next fiscal year $ 300