Accumulated Other Comprehensive Income (Loss) - Schedule of Accumulated Other Comprehensive (Loss) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	$ 1,417,611	$ 1,435,598	$ 1,115,388
Ending balance	(739,723)	1,417,611	1,435,598
Reclassification of stranded tax effects
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(4,809)	(4,809)	(19,720)
Gains (Losses) During the Period, Pre-tax Activity	0	0	0
Gains (Losses) During the Period, Tax Effect	0	0	0
Reclassification to Income, Pre-tax Activity	0	0	0
Reclassification to Income, Tax Effect	0	0	14,911
Ending balance	(4,809)	(4,809)	(4,809)
Total AOCI
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	1,885	(4,276)	(84,837)
Gains (Losses) During the Period, Pre-tax Activity	(10,617)	8,097	(4,955)
Gains (Losses) During the Period, Tax Effect	2,614	(1,982)	1,212
Reclassification to Income, Pre-tax Activity	150	60	114,758
Reclassification to Income, Tax Effect	(37)	(14)	(30,454)
Ending balance	(6,005)	1,885	(4,276)
Unrealized gain on short-term investments
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	25	0
Gains (Losses) During the Period, Pre-tax Activity	20	33
Gains (Losses) During the Period, Tax Effect	(6)	(8)
Reclassification to Income, Pre-tax Activity	(53)	0
Reclassification to Income, Tax Effect	14	0
Ending balance	0	25	0
Pension Plans | Actuarial gain (loss)
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance		(67,378)	(71,140)
Gains (Losses) During the Period, Pre-tax Activity			3,036
Gains (Losses) During the Period, Tax Effect			(744)
Reclassification to Income, Pre-tax Activity			1,946
Reclassification to Income, Tax Effect			(476)
Ending balance			(67,378)
Pension Plans | Actuarial gain (loss) | Bargaining Plan
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	4,418	533
Gains (Losses) During the Period, Pre-tax Activity	26	5,144
Gains (Losses) During the Period, Tax Effect	(5)	(1,259)
Reclassification to Income, Pre-tax Activity	0	0
Reclassification to Income, Tax Effect	0	0
Ending balance	4,439	4,418	533
Pension Plans | Prior service costs
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance		(97)	(105)
Gains (Losses) During the Period, Pre-tax Activity			(5)
Gains (Losses) During the Period, Tax Effect			1
Reclassification to Income, Pre-tax Activity			16
Reclassification to Income, Tax Effect			(4)
Ending balance			(97)
Pension Plans | Prior service costs | Bargaining Plan
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(85)	(97)
Gains (Losses) During the Period, Pre-tax Activity	(124)	0
Gains (Losses) During the Period, Tax Effect	31	0
Reclassification to Income, Pre-tax Activity	16	16
Reclassification to Income, Tax Effect	(5)	(4)
Ending balance	(167)	(85)	(97)
Pension Plans | Pension plan settlement
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance		67,911	0
Gains (Losses) During the Period, Pre-tax Activity			0
Gains (Losses) During the Period, Tax Effect			0
Reclassification to Income, Pre-tax Activity			112,796
Reclassification to Income, Tax Effect			(44,885)
Ending balance			67,911
Postretirement Benefits | Actuarial gain (loss)
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	2,960	721	6,752
Gains (Losses) During the Period, Pre-tax Activity	(10,539)	2,920	(7,986)
Gains (Losses) During the Period, Tax Effect	2,594	(715)	1,955
Reclassification to Income, Pre-tax Activity	187	44	0
Reclassification to Income, Tax Effect	(46)	(10)	0
Ending balance	(4,844)	2,960	721
Postretirement Benefits | Prior service costs
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(624)	(624)	(624)
Gains (Losses) During the Period, Pre-tax Activity	0	0	0
Gains (Losses) During the Period, Tax Effect	0	0	0
Reclassification to Income, Pre-tax Activity	0	0	0
Reclassification to Income, Tax Effect	0	0	0
Ending balance	$ (624)	$ (624)	$ (624)