Employee Benefit Plans Net Periodic Benefit Cost (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Components of Net Periodic Benefit Cost (Income) [Abstract]
Minimum Expected Future Employer Pension Contributions, Remainder of Fiscal Year	$ 8,000		$ 8,000
Pension Benefits [Member]
Components of Net Periodic Benefit Cost (Income) [Abstract]
Service cost	1,378	$ 1,422	2,796	$ 2,916
Interest cost	5,739	6,482	11,472	13,047
Expected return on plan assets	(6,335)	(6,671)	(12,663)	(13,357)
Amortization of prior service credit	0	0	0	0
Recognized actuarial loss (gain)	6	(3)	17	137
Net periodic benefit cost (credit)	788	1,230	1,622	2,743
Other Postretirement Benefits [Member]
Components of Net Periodic Benefit Cost (Income) [Abstract]
Service cost	74	79	154	166
Interest cost	132	161	279	337
Expected return on plan assets	(321)	(273)	(640)	(548)
Amortization of prior service credit	0	29	0	58
Recognized actuarial loss (gain)	(25)	5	(37)	36
Net periodic benefit cost (credit)	$ (140)	$ 1	$ (244)	$ 49