Schedule of Net Periodic Pension Benefit Costs (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Retirement Benefits [Abstract]
Service cost	$ 1,149	$ 976
Interest cost	352	473
Expected return on plan assets	(89)	(146)
Amortization of prior service costs	17	16
Amortization of actuarial net loss	695	455
Net periodic benefit cost	$ 2,124	$ 1,774