Income Taxes Net deferred tax asset (liability) (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Deferred Tax Assets [Abstract]
Deferred Tax Assets, Tax Deferred Expense, Other	$ 135,703	$ 142,515
Inventory valuation reserves	78,518	97,585
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals	58,686	64,373
NOL carryforwards:
Federal	0	12,962
State	184,046	200,710
Energy credit and charitable contribution carryforward	5,344	8,648
Deferred Tax Assets, Gross	462,297	526,793
Deferred Tax Liabilities [Abstract]
Deferred income	(313,170)	(228,186)
Intangibles and other	(46,595)	(44,547)
Deferred Tax Liabilities, Gross	(359,765)	(272,733)
Valuation allowance	(69,813)	(83,953)
Net deferred tax asset (liability)	$ 32,719	$ 170,107