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Other Balance Sheet Items Other Balance Sheet Items (Other long-term assets) (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Balance Sheet Related Disclosures [Abstract]    
Restricted Cash $ 9,374 $ 9,338
Operating Lease, Right-of-Use Asset 9,139 0
Prepaid registry fees, noncurent 7,884 7,779
Restricted Cash and Investments, Noncurrent 5,673 5,673
Nontrade Receivables, Noncurrent 0 14,721
Other Assets, Miscellaneous, Noncurrent 4,182 3,535
Other Assets, Noncurrent $ 36,252 $ 41,046