Other Balance Sheet Items Other balance Sheet items (Other long-term assets) (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Balance Sheet Related Disclosures [Abstract]
Prepaid Expense, Noncurrent	$ 10,976	$ 7,105
Prepaid registry fees, noncurent	8,693	7,997
Operating Lease, Right-of-Use Asset	8,418	11,277
Restricted Cash and Investments, Noncurrent	5,329	9,407
Other Assets, Miscellaneous, Noncurrent	2,144	2,172
Total other long-term assets	$ 35,560	$ 37,958