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Schedule of Net Periodic Pension Benefit Costs (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Retirement Benefits [Abstract]        
Service cost $ 1,102 $ 1,017 $ 2,251 $ 1,993
Interest cost 349 457 701 930
Expected return on plan assets (88) (134) (177) (280)
Amortization of prior service costs 17 16 34 32
Amortization of actuarial net loss 694 453 1,389 908
Net periodic benefit cost $ 2,074 $ 1,809 $ 4,198 $ 3,583