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Other Balance Sheet Items (Prepaid Expenses And Other Current Assets) (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Balance Sheet Related Disclosures [Abstract]    
Prepaid registry fees, current $ 20,696 $ 0
Prepaid expenses 14,109 15,787
Accounts Receivable, Net, Current 6,029 5,111
Income Taxes Receivable 4,451 6,347
Other 2,080 4,157
Other current assets $ 47,365 $ 31,402