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Other Balance Sheet Items Other balance Sheet items (Other long-term assets) (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Balance Sheet Related Disclosures [Abstract]    
Restricted Cash $ 9,288 $ 9,636
Nontrade Receivables, Noncurrent 5,673 5,673
Prepaid Expense and Other Assets, Noncurrent 3,642 3,884
Total other long-term assets $ 18,603 $ 19,193