Pension Plans and Other Postretirement Benefits (Details-6) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Defined Benefit Plan, Expected Future Employer Contributions [Abstract]
Expected employer contributions, 2023	$ 0
Cash contributions to pension and other postretirement plans	(7,308)	$ (6,935)	$ (6,296)
Pension Benefits [Member]
Defined Benefit Plan, Expected Future Benefit Payment [Abstract]
Defined benefit plan expected future benefit payments, 2023	20,715
Defined benefit plan expected future benefit payments, 2024	21,304
Defined benefit plan expected future benefit payments, 2025	21,864
Defined benefit plan expected future benefit payments, 2026	22,305
Defined benefit plan expected future benefit payments, 2027	22,789
Defined benefit plan expected future benefit payments, 2028-2032	117,798
Other Postretirement Benefits Plan [Member]
Defined Benefit Plan, Expected Future Benefit Payment [Abstract]
Defined benefit plan expected future benefit payments, 2023	5,051
Defined benefit plan expected future benefit payments, 2024	5,363
Defined benefit plan expected future benefit payments, 2025	5,637
Defined benefit plan expected future benefit payments, 2026	5,544
Defined benefit plan expected future benefit payments, 2027	5,560
Defined benefit plan expected future benefit payments, 2028-2032	27,199
Medicare Part D Subsidies
Expected Medicare Part D Subsidies, 2023	(332)
Expected Medicare Part D Subsidies, 2024	(365)
Expected Medicare Part D Subsidies, 2025	(400)
Expected Medicare Part D Subsidies, 2026	(447)
Expected Medicare Part D Subsidies, 2027	(483)
Expected Medicare Part D Subsidies, 2028-2032	(2,833)
Defined benefit plan expected net future benefit payments, 2023	4,719
Defined benefit plan expected net future benefit payments, 2024	4,998
Defined benefit plan expected net future benefit payments, 2025	5,237
Defined benefit plan expected net future benefit payments, 2026	5,097
Defined benefit plan expected net future benefit payments, 2027	5,077
Defined benefit plan expected net future benefit payments, 2028-2032	$ 24,366