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Pension Plan (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Retirement Benefits [Abstract]    
Service cost $ 253 $ 169
Interest cost on projected benefit obligation 782 701
Expected return on plan assets (1,181) (1,354)
Net amortization and deferral 720 672
Net periodic pension cost 574 $ 188
Defined Benefit Plan, Non-service cost $ 300