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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

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