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Other Balance Sheet Items (Other Current Assets) (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Balance Sheet Related Disclosures [Abstract]    
Prepaid registry fees, current $ 20,755 $ 0
Prepaid expenses 19,582 15,787
Accounts Receivable, Net 8,397 5,111
Income Taxes Receivable, Current 3,672 6,347
Other Assets, Miscellaneous, Current 4,610 4,157
Other Assets, Current $ 57,016 $ 31,402