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PENSIONS (Details) (USD $)
12 Months Ended
Dec. 31, 2011
Employee
Dec. 31, 2010
Dec. 31, 2009
Defined contribution scheme:      
Defined contribution scheme, charge to net income $ 800,000 $ 500,000 $ 700,000
Number of Norwegian employees 13    
Pensions
     
Defined benefit schemes:      
Number of defined benefit schemes 2    
Accumulated other comprehensive income, net actuarial loss 15,876,000 12,347,000  
Other comprehensive income, tax on actuarial loss $ 400,000 $ 0 $ 0