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Details of Certain Accounts - Other Current Assets (Details) - USD ($) $ in Thousands | Dec. 31, 2015 | Dec. 31, 2014
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Organization, Consolidation and Presentation of Financial Statements [Abstract] |  |
Note receivable (Note 4) | $ 10,000 | $ 17,500
Other receivables | 426 | 423
Prepaid insurance | 5,433 | 6,582
Other prepaids | 10,751 | 15,541
Spare parts inventory | 4,985 | 1,857
Value added tax receivable | 7,842 | 9,326
Other | 81 | 72
Total other current assets | $ 39,518 | $ 51,301

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