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TAXATION (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Components of income tax expense:      
Current tax expense (income) $ 9,931 $ 4,096 $ 2,625
Amortization of tax benefit arising on intra-group transfers of long term assets (7,257) (6,687) 0
Total income tax (gain) expense 2,765 (1,705) 1,427
Deferred tax assets, noncurrent 531 622  
United Kingdom tax authority
      
Components of income tax expense:      
Current tax expense (income) 2,101 2,733 1,030
Deferred tax expense (income) 91 886 (1,198)
Statutory tax rate 24.00%    
Deferred tax assets, noncurrent 531 600  
Indonesia Tax Authority
      
Components of income tax expense:      
Current tax expense (income) 6,828 0 0
Brazil Tax authority
      
Components of income tax expense:      
Current tax expense (income) 1,002 1,363 1,595
Internal Revenue Service (IRS)
      
Components of income tax expense:      
Minimum resident ownership percentage required for income tax exemption 50.00%    
Foreign country
      
Components of income tax expense:      
Current tax expense (income) 0    
Deferred income tax assets:      
Deferred tax assets, net $ 531 $ 622