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Details Of Certain Accounts - Other Non-Current Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
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Organization, Consolidation and Presentation of Financial Statements [Abstract] |  |
Investee losses in excess of investment (Note 5) | $ 7,567 | $ 10,238
Deferred gain on sale of property (Note 4) | 5,838 | 5,761
Deferred revenue | 8,744 | 8,598
Derivative liability (Note 17) | 8,150 | 20,191
Other | 10,391 | 8,197
Total other non-current liabilities | $ 40,690 | $ 52,985

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