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Income Taxes (Summary Of Deferred Tax Assets And Liabilities) (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
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Income Tax Expense (Benefit), Continuing Operations [Abstract] |  |
Net operating loss carryforwards | $ 5,623 | $ 17,897
Tax credit carryforwards | 5,078 | 5,516
Deferred revenue, accruals and reserves | 66,926 | 70,539
Other | 2,379 | 7,401
Total deferred tax assets | 80,006 | 101,353
Valuation allowance | (5,613) | (6,598)
Net deferred tax assets | 74,393 | 94,755
Property and equipment | (4,167) | (3,466)
Other | (2,394) | (3,608)
Deferred Tax Liabilities, Gross | (6,561) | (7,074)
Total deferred tax assets | $ 67,832 | $ 87,681

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