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Other Balance Sheet Items (Other Current Assets) (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Balance Sheet Related Disclosures [Abstract]    
Prepaid registry fees, current $ 21,739 $ 20,696
Estimated contingent consideration receivable 14,721 0
Prepaid expenses 22,367 14,109
Accounts Receivable, Net 5,257 6,029
Income Taxes Receivable, Current 4,656 4,451
Other Assets, Miscellaneous, Current 1,700 2,080
Other Assets, Current $ 70,440 $ 47,365