Schedule of Net Periodic Pension Benefit Costs (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Retirement Benefits [Abstract]
Service cost	$ 1,007	$ 868	$ 3,000	$ 2,839
Interest cost	434	564	1,364	1,719
Expected return on plan assets	(85)	(151)	(365)	(460)
Amortization of prior service costs	17	16	49	49
Amortization of actuarial net loss	482	332	1,390	1,019
Settlement	286	250	286	250
Net periodic benefit cost	$ 2,141	$ 1,879	$ 5,724	$ 5,416