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Income Taxes (Narrative) (Details) - USD ($) $ in Thousands | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Operating loss and tax credit carryforwards |  |  |  |
Valuation allowance, deferred tax asset, decrease | $ 177,900 |  |  |
Unrecognized tax benefits | 184,921 | $ 164,531 | $ 146,215 | $ 134,044
Long-term income taxes payable |  |  |  |
Operating loss and tax credit carryforwards |  |  |  |
Unrecognized tax benefits | 78,900 | $ 1,300 |  |
State and local tax authority | California Franchise Tax Board |  |  |  |
Operating loss and tax credit carryforwards |  |  |  |
Operating loss carryforwards | 167,700 |  |  |
Tax credit carryforwards, alternative minimum tax credit | 500 |  |  |
State and local tax authority | Other |  |  |  |
Operating loss and tax credit carryforwards |  |  |  |
Operating loss carryforwards | 800 |  |  |
Research and development tax credit carryforward | Federal |  |  |  |
Operating loss and tax credit carryforwards |  |  |  |
Tax credit carryforwards | 45,200 |  |  |
Research and development tax credit carryforward | State and local tax authority | California Franchise Tax Board |  |  |  |
Operating loss and tax credit carryforwards |  |  |  |
Tax credit carryforwards | 28,100 |  |  |
Foreign tax credit |  |  |  |
Operating loss and tax credit carryforwards |  |  |  |
Tax credit carryforwards | 10,100 |  |  |
Foreign tax credit | Federal |  |  |  |
Operating loss and tax credit carryforwards |  |  |  |
Tax credit carryforward, subject to expiration | $ 3,900 |  |  |

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