Postretirement Benefits - Analysis of Impact on Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Defined Benefit Plan, Impact on Other Comprehensive Income
Balance at January 1	$ 26,194	$ (2,727)	$ 1,570
Prior service cost (credit)	1,168	1,071	1,075
Net actuarial (gain) loss	(915)	(597)	(1,465)
Total amortization	253	474	(390)
Plan amendments	0	(1,212)	0
Experience gain (loss)	10,522	29,659	(3,907)
Balance at December 31	36,969	26,194	(2,727)
Other Benefits
Defined Benefit Plan, Impact on Other Comprehensive Income
Total amortization	$ (959)	$ (622)	$ (732)