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Employee Retirement Plans (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Components of the Company's net periodic pension cost    
Service cost $ 115 $ 103
Interest cost 500 606
Expected return on plan assets (690) (626)
Net amortization and deferral 186 146
Net periodic pension cost $ 111 $ 229