Details Of Certain Accounts - Other Non-Current Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
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