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PENSIONS (Details) (USD $)
 12 Months Ended
Dec. 31, 2013
Employee
Dec. 31, 2012
Employee
Dec. 31, 2011
Defined contribution scheme:      
Defined contribution scheme, charge to net income $ 500,000 $ 800,000 $ 800,000
Number of Norwegian employees 10 10  
Pensions
      
Defined benefit schemes:      
Number of defined benefit schemes 2    
Accumulated other comprehensive income, net actuarial loss 12,731,000 17,809,000  
Other comprehensive income, tax on actuarial loss $ 100,000 $ 300,000 $ 400,000