Schedule of Net Periodic Pension Benefit Costs (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Defined Benefit Plan [Abstract]
Service cost	$ 1,017	$ 892	$ 1,993	$ 1,971
Interest cost	457	573	930	1,155
Expected return on plan assets	(134)	(153)	(280)	(309)
Amortization of prior service costs	16	16	32	33
Amortization of actuarial net loss	453	342	908	687
Net periodic benefit cost	$ 1,809	$ 1,670	$ 3,583	$ 3,537