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Other Balance Sheet Items Other Balance Sheet Items (Other long-term assets) (Details) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Balance Sheet Related Disclosures [Abstract]    
Restricted Cash $ 9,407 $ 9,407
Operating Lease, Right-of-Use Asset 10,979 11,277
Prepaid Expense, Noncurrent 10,368 7,105
Prepaid registry fees, noncurent 8,231 7,997
Income Taxes Receivable, Noncurrent 969 969
Other Assets, Miscellaneous, Noncurrent 1,154 1,203
Other Assets, Noncurrent $ 41,108 $ 37,958