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Other Balance Sheet Items Other Balance Sheet Items (Other long-term assets) (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Balance Sheet Related Disclosures [Abstract]    
Prepaid registry fees, noncurent $ 7,752 $ 0
Restricted Cash and Investments, Noncurrent 9,321 9,288
Nontrade Receivables, Noncurrent 5,673 5,673
Other Assets, Miscellaneous, Noncurrent 4,332 3,642
Other Assets, Noncurrent $ 27,078 $ 18,603