Income Taxes - Deferred Taxes (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Jan. 01, 2022	Dec. 31, 2021
Deferred tax assets:
Net operating loss carryforward and federal credits	$ 63,200		$ 93,294
Warrants	31,524		32,075
Operating lease obligation	15,727		13,266
Post-retirement employee benefits	3,081		0
Employee benefits other than post-retirement	5,666		6,919
Inventory reserve	2,920		2,714
Deferred revenue	4,863		10,918
Other	13,519		8,789
Deferred tax assets	140,500		167,975
Deferred tax liabilities:
Accelerated depreciation	(326,804)		(327,321)
Post-retirement employee benefits	0		(1,330)
Partnership items	(6,365)		(6,014)
Operating lease assets	(15,492)		(13,029)
State taxes	(24,207)		(19,158)
Goodwill and intangible assets	(18,952)		(14,553)
Valuation allowance against deferred tax assets	(3,861)		(3,861)
Deferred tax liabilities	(395,681)		(385,266)
Net deferred tax (liability)	$ (255,181)	$ (211,764)	$ (217,291)