Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Schedule of Accumulated Other Comprehensive Income [Line Items]
Beginning balance	$ 1,412,506	$ 1,322,377	$ 855,497
Actuarial gain (loss) for retiree liabilities	15,670	(55,926)	14,315
Foreign currency translation adjustment	20		(6)
Ending balance	1,368,702	1,412,506	1,322,377
Defined Benefit Pension
Schedule of Accumulated Other Comprehensive Income [Line Items]
Beginning balance	(103,418)	(61,831)	(78,093)
Actuarial gain (loss) for retiree liabilities	15,076	(56,223)	14,087
Actuarial costs	18,980	2,630	7,056
Income Tax (Expense) or Benefit	(12,714)	12,006	(4,881)
Other comprehensive income (loss), net of tax	45,487	(41,587)	16,262
Ending balance	(57,931)	(103,418)	(61,831)
Defined Benefit Pension | Cash Settlement
Schedule of Accumulated Other Comprehensive Income [Line Items]
Actuarial costs	24,145
Defined Benefit Post-Retirement
Schedule of Accumulated Other Comprehensive Income [Line Items]
Beginning balance	36	(229)	(549)
Actuarial gain (loss) for retiree liabilities	594	297	228
Actuarial costs	0	45	188
Income Tax (Expense) or Benefit	(128)	(77)	(96)
Other comprehensive income (loss), net of tax	466	265	320
Ending balance	502	36	(229)
Foreign Currency Translation
Schedule of Accumulated Other Comprehensive Income [Line Items]
Beginning balance	(20)	(20)	(14)
Foreign currency translation adjustment	20		(6)
Income Tax (Expense) or Benefit			0
Other comprehensive income (loss), net of tax	20	0	(6)
Ending balance	0	(20)	(20)
Total
Schedule of Accumulated Other Comprehensive Income [Line Items]
Beginning balance	(103,402)	(62,080)	(78,656)
Actuarial costs	18,980	2,675	7,244
Income Tax (Expense) or Benefit	(12,842)	11,929	(4,977)
Other comprehensive income (loss), net of tax	45,973	(41,322)	16,576
Ending balance	(57,429)	$ (103,402)	$ (62,080)
Total | Cash Settlement
Schedule of Accumulated Other Comprehensive Income [Line Items]
Actuarial costs	$ 24,145