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Details Of Certain Accounts - Other Non-Current Liabilities (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Organization, Consolidation and Presentation of Financial Statements [Abstract]    
Investee losses in excess of investment (Note 5) $ 6,518 $ 7,567
Deferred gain on sale of property 5,466 5,838
Deferred revenue (Note 9) 20,169 8,744
Derivative liability (Note 15) 3,353 8,150
Other 11,193 10,391
Total other non-current liabilities $ 46,699 $ 40,690
Term of lease agreement 15 years