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Income Taxes (Narrative) (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019
Deferred Tax Assets Tax Credit Carryforwards Domestic | $ 64,081 | $ 49,937
Deferred Tax Assets Tax Credit Carryforwards State And Local | 7,369 | 7,750
Net operating loss carryforwards - Federal | 11,670 | 27,935
Uncategorized Tax Benefits | 51,569 | $ 51,596
Tax impact from CARES Act | 41,600 |
Reduction of the deferred asset associated with the federal tax credit carryforwards | 51,400 |
Significant Change in Unrecognized Tax Benefits is Reasonably Possible, Amount of Unrecorded Benefit | 23,000 |
Begin To Expire In 2033 [Member] |  |
Deferred Tax Assets Tax Credit Carryforwards Domestic | 67,800 |
Begin To Expire In 2021 [Member] |  |
Deferred Tax Assets Tax Credit Carryforwards State And Local | $ 7,400 |

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