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Income Taxes (Narrative) (Details) - USD ($) $ in Thousands | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Operating loss and tax credit carryforwards |  |  |  |
Unrecognized tax benefits | $ 164,531 | $ 146,215 | $ 134,044 | $ 115,653
State and local tax authority | California Franchise Tax Board |  |  |  |
Operating loss and tax credit carryforwards |  |  |  |
Operating loss carryforwards | 191,700 |  |  |
Tax credit carryforwards, alternative minimum tax credit | 300 |  |  |
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 | 41,800 |  |  |
Research and development tax credit carryforward | State and local tax authority | California Franchise Tax Board |  |  |  |
Operating loss and tax credit carryforwards |  |  |  |
Tax credit carryforwards | 25,600 |  |  |
Foreign tax credit |  |  |  |
Operating loss and tax credit carryforwards |  |  |  |
Tax credit carryforwards | 51,200 |  |  |
Foreign tax credit | Federal |  |  |  |
Operating loss and tax credit carryforwards |  |  |  |
Tax credit carryforward, subject to expiration | $ 10,800 |  |  |

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