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Retirement Benefits (Details)
$ in Thousands
3 Months Ended
Mar. 31, 2021
USD ($)
person
Mar. 31, 2020
USD ($)
Postemployment Benefits [Abstract]    
Service cost $ 220 $ 188
Interest cost 236 270
Expected return on plan assets (704) (687)
Amortization of net loss 314 169
Net Periodic Benefit Expense (Income) $ 66 $ (60)
Number of active, vested, terminated and retired persons in the Plan | person 347