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Other Balance Sheet Items Other Balance Sheet Items (Other long-term assets) (Details) - USD ($)
$ in Thousands
Sep. 30, 2015
Dec. 31, 2014
Balance Sheet Related Disclosures [Abstract]    
Long-term restricted cash $ 11,694 $ 8,028
Other tax receivable 5,673 5,673
Long-term prepaid expenses and other assets 6,729 2,217
Total other long-term assets $ 24,096 $ 15,918