Schedule of Net Periodic Pension Benefit Costs (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Retirement Benefits [Abstract]
Service cost	$ 1,125	$ 1,007	$ 3,376	$ 3,000
Interest cost	345	434	1,046	1,364
Expected return on plan assets	(87)	(85)	(264)	(365)
Amortization of prior service costs	17	17	51	49
Amortization of actuarial net loss	681	482	2,070	1,390
Settlement	0	286	0	286
Net periodic benefit cost	$ 2,081	$ 2,141	$ 6,279	$ 5,724