Annual report pursuant to Section 13 and 15(d)

Employee Benefit Plans - Summary of Net Periodic Benefits Cost (Details)

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Employee Benefit Plans - Summary of Net Periodic Benefits Cost (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Components of net periodic benefit cost:      
Service cost $ 666 $ 157 $ 147
Interest cost 197 183 201
Expected return on plan assets (364) (367) (339)
Amortization of net loss 46 64 108
Net periodic benefit cost $ 545 $ 37 $ 117