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PENSIONS - Reconciliation of Funded Status (Details) (USD $)
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Pensions
      
Reconciliation of funded status:      
Projected benefit obligation $ (52,430,000) $ (51,056,000) $ (51,233,000)
Fair value of plan assets 14,846,000 17,605,000 18,644,000
Funded status (37,584,000) [1] (33,451,000) [1]  
Employer contributions and benefit payment amounts paid from employer assets 2,400,000 2,400,000  
UK Scheme
      
Reconciliation of funded status:      
Projected benefit obligation (9,839,000) (10,083,000)  
Fair value of plan assets 8,251,000 8,658,000  
Funded status (1,588,000) (1,425,000)  
Marine Scheme
      
Reconciliation of funded status:      
Projected benefit obligation (42,591,000) (40,973,000)  
Fair value of plan assets 6,595,000 8,947,000  
Funded status $ (35,996,000) $ (32,026,000)  
[1] The Company's plans are composed of two plans that are both underfunded as at December 31, 2011 and 2010.