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Retirement Plans (Details) - Defined Benefit Plan [Member] - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]    
Service cost $ 400 $ 359
Interest cost 256 320
Expected return on plan assets (209) (231)
Recognized actuarial loss (gain) 16 (39)
Total defined benefit expense $ 463 $ 409