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Other Balance Sheet Items Other balance Sheet items (Other long-term assets) (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Balance Sheet Related Disclosures [Abstract]    
Contingent Consideration receivable $ 14,721 $ 0
Prepaid registry fees, noncurent 7,779 0
Restricted Cash 9,338 9,288
Nontrade Receivables, Noncurrent 5,673 5,673
Prepaid Expense and Other Assets, Noncurrent 3,535 3,642
Total other long-term assets $ 41,046 $ 18,603