Pension Plans and Other Postretirement Benefits (Details-6) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Defined Benefit Plan, Expected Future Employer Contributions [Abstract]
Cash contributions to pension and other postretirement plans	$ (7,722)	$ (7,747)	$ (7,308)
Pension Benefits [Member]
Defined Benefit Plan, Expected Future Employer Contributions [Abstract]
Expected employer contributions, 2025	2,400
Defined Benefit Plan, Expected Future Benefit Payment [Abstract]
Defined benefit plan expected future benefit payments, 2025	22,164
Defined benefit plan expected future benefit payments, 2026	22,439
Defined benefit plan expected future benefit payments, 2027	22,794
Defined benefit plan expected future benefit payments, 2028	23,024
Defined benefit plan expected future benefit payments, 2029	23,307
Defined benefit plan expected future benefit payments, 2030-2034	117,422
Other Postretirement Benefits Plan [Member]
Defined Benefit Plan, Expected Future Employer Contributions [Abstract]
Expected employer contributions, 2025	400
Defined Benefit Plan, Expected Future Benefit Payment [Abstract]
Defined benefit plan expected future benefit payments, 2025	5,520
Defined benefit plan expected future benefit payments, 2026	5,525
Defined benefit plan expected future benefit payments, 2027	5,505
Defined benefit plan expected future benefit payments, 2028	5,477
Defined benefit plan expected future benefit payments, 2029	5,422
Defined benefit plan expected future benefit payments, 2030-2034	25,868
Medicare Part D Subsidies
Expected Medicare Part D Subsidies, 2024	(410)
Expected Medicare Part D Subsidies, 2025	(464)
Expected Medicare Part D Subsidies, 2026	(508)
Expected Medicare Part D Subsidies, 2027	(545)
Expected Medicare Part D Subsidies, 2028	(580)
Expected Medicare Part D Subsidies, 2029-2033	(3,337)
Defined benefit plan expected net future benefit payments, 2024	5,110
Defined benefit plan expected net future benefit payments, 2025	5,061
Defined benefit plan expected net future benefit payments, 2026	4,997
Defined benefit plan expected net future benefit payments, 2027	4,932
Defined benefit plan expected net future benefit payments, 2028	4,842
Defined benefit plan expected net future benefit payments, 2029-2033	$ 22,531