Income Taxes (Summary Of Deferred Tax Assets And Liabilities) (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Income Tax Expense (Benefit), Continuing Operations [Abstract]
Deferred Tax Asset Intellectual property	$ 165,517	$ 0
Deferred revenue, accruals and reserves	68,574	66,926
Net operating loss carryforwards	4,747	5,623
Tax credit carryforwards	3,514	5,078
Other	1,693	2,379
Total deferred tax assets	244,045	80,006
Valuation allowance	(5,530)	(5,613)
Net deferred tax assets	238,515	74,393
Property and equipment	(6,644)	(4,167)
Other	(1,203)	(2,394)
Deferred Tax Liabilities, Gross	(7,847)	(6,561)
Total deferred tax assets	$ 230,668	$ 67,832