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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
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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

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