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Income Taxes (Summary Of Deferred Tax Assets And Liabilities) (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
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Income Tax Expense (Benefit), Continuing Operations [Abstract] |  |
Net operating loss carryforwards | $ 17,897 | $ 40,729
Tax credit carryforwards | 5,516 | 3,970
Deferred revenue, accruals and reserves | 70,539 | 73,847
Other | 7,401 | 6,724
Total deferred tax assets | 101,353 | 125,270
Valuation allowance | (6,598) | (10,153)
Net deferred tax assets | 94,755 | 115,117
Property and equipment | (3,466) | (2,764)
Other | (3,608) | (7,495)
Deferred Tax Liabilities, Gross | (7,074) | (10,259)
Total deferred tax assets | $ 87,681 | $ 104,858

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