Income Taxes - Deferred Taxes (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022	Jan. 01, 2022	Dec. 31, 2021
Deferred tax assets:
Net operating loss carryforward and federal credits	$ 43,621	$ 63,200
Warrants	32,199	31,524
Operating lease obligation	11,583	15,727
Post-retirement employee benefits	570	3,081
Deferred Tax Asset, Interest Carryforward	6,655	0
Employee benefits other than post-retirement	3,776	5,666
Inventory reserve	3,238	2,920
Deferred revenue	6,952	4,863
Other	14,476	13,519
Deferred tax assets	123,070	140,500
Deferred tax liabilities:
Accelerated depreciation	(337,099)	(326,804)
Partnership items	(6,263)	(6,365)
Operating lease assets	(11,353)	(15,492)
State taxes	(26,213)	(24,207)
Goodwill and intangible assets	(23,529)	(18,952)
Valuation allowance against deferred tax assets	(3,861)	(3,861)
Deferred tax liabilities	(408,318)	(395,681)
Net deferred tax (liability)	$ (285,248)	$ (255,181)	$ (211,764)	$ (217,291)