Schedule of Net Periodic Pension Benefit Costs (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Defined Benefit Plan [Abstract]
Service cost	$ 976	$ 1,079
Interest cost	473	582
Expected return on plan assets	(146)	(156)
Amortization of prior service costs	16	17
Amortization of actuarial net loss	455	345
Net periodic benefit cost	$ 1,774	$ 1,867