Pension Plans and Other Postretirement Benefits (Details-2) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Amortization of:
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Interest Cost, Statement of Income or Comprehensive Income [Extensible Enumeration]	Nonoperating Income (Expense)
Defined Benefit Plan, Net Periodic Benefit (Cost) Credit, Expected Return (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]	Nonoperating Income (Expense)
Defined Benefit Plan, Net Periodic Benefit (Cost) Credit, Amortization of Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]	Nonoperating Income (Expense)
Defined Benefit Plan, Net Periodic Benefit (Cost) Credit, Amortization of Transition Asset (Obligation), Statement of Income or Comprehensive Income [Extensible Enumeration]	Nonoperating Income (Expense)
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Amortization of Prior Service Cost (Credit), Statement of Income or Comprehensive Income [Extensible Enumeration]	Nonoperating Income (Expense)
Pension Benefits [Member]
Components of Net Periodic Benefit Cost [Abstract]
Service cost	$ 3,078	$ 2,892	$ 5,064
Interest cost	17,118	17,319	11,161
Expected return on assets	(28,597)	(25,248)	(31,391)
Settlement cost	0	0	0
Amortization of:
Transition obligation	0	0	0
Prior service (credit) cost	0	0	(20)
Actuarial loss	859	1,760	2,416
Net periodic benefit cost (credit)	(7,542)	(3,277)	(12,770)
Postretirement Benefits [Member]
Components of Net Periodic Benefit Cost [Abstract]
Service cost	856	780	1,293
Interest cost	3,126	3,308	1,940
Expected return on assets	(2,725)	(2,595)	(3,365)
Settlement cost	288	0	0
Amortization of:
Transition obligation	3	3	3
Prior service (credit) cost	(242)	0	(297)
Actuarial loss	380	(190)	145
Net periodic benefit cost (credit)	$ 1,686	$ 1,306	$ (281)