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TAXATION (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Components of income tax expense:      
Current tax expense (credit) $ 435 $ 2,212 $ (27)
Amortization of tax benefit arising on intra-group transfers of long-term assets (3,488) (3,487) (3,487)
Total income tax credit $ (3,053) $ (1,114) $ (3,404)
Statutory tax rate 0.00% 0.00% 0.00%
Income taxes at statutory rate $ 0 $ 0 $ 0
Effect of deferred tax benefit on intra-group transfers of long-term assets (3,488) (3,487) (3,487)
Effect of adjustments in respect of current tax in prior periods (330) 1,411 (188)
Effect of taxable income in various countries 765 962 271
Deferred tax assets, gross and net 260 260  
United Kingdom tax authority      
Components of income tax expense:      
Current tax expense (credit) 435 2,212 (27)
Deferred tax expense $ 0 161 $ 110
Statutory tax rate 20.00%    
Deferred tax assets, gross and net $ 300 $ 300  
Internal Revenue Service (IRS)      
Components of income tax expense:      
Minimum resident ownership percentage required for income tax exemption 50.00%