Pension Plans and Other Postretirement Benefits (Details-6) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Defined Benefit Plan, Expected Future Employer Contributions [Abstract]
Cash contributions to pension and other postretirement plans	$ (7,979)	$ (7,722)	$ (7,747)
Pension Benefits [Member]
Defined Benefit Plan, Expected Future Employer Contributions [Abstract]
Expected employer contributions, 2025	2,500
Defined Benefit Plan, Expected Future Benefit Payment [Abstract]
Defined benefit plan expected future benefit payments, 2025	22,689
Defined benefit plan expected future benefit payments, 2026	22,878
Defined benefit plan expected future benefit payments, 2027	23,123
Defined benefit plan expected future benefit payments, 2028	23,297
Defined benefit plan expected future benefit payments, 2029	23,392
Defined benefit plan expected future benefit payments, 2030-2034	118,606
Other Postretirement Benefits Plan [Member]
Defined Benefit Plan, Expected Future Employer Contributions [Abstract]
Expected employer contributions, 2025	500
Defined Benefit Plan, Expected Future Benefit Payment [Abstract]
Defined benefit plan expected future benefit payments, 2025	5,404
Defined benefit plan expected future benefit payments, 2026	5,415
Defined benefit plan expected future benefit payments, 2027	5,383
Defined benefit plan expected future benefit payments, 2028	5,311
Defined benefit plan expected future benefit payments, 2029	5,247
Defined benefit plan expected future benefit payments, 2030-2034	24,843
Medicare Part D Subsidies
Expected Medicare Part D Subsidies, 2024	(461)
Expected Medicare Part D Subsidies, 2025	(504)
Expected Medicare Part D Subsidies, 2026	(541)
Expected Medicare Part D Subsidies, 2027	(577)
Expected Medicare Part D Subsidies, 2028	(608)
Expected Medicare Part D Subsidies, 2029-2033	(3,410)
Defined benefit plan expected net future benefit payments, 2024	4,943
Defined benefit plan expected net future benefit payments, 2025	4,911
Defined benefit plan expected net future benefit payments, 2026	4,842
Defined benefit plan expected net future benefit payments, 2027	4,734
Defined benefit plan expected net future benefit payments, 2028	4,639
Defined benefit plan expected net future benefit payments, 2029-2033	$ 21,433