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PENSIONS - Reconciliation of Funded Status (Details) (USD $)
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Pensions
     
Reconciliation of funded status:      
Projected benefit obligation $ (54,291,000) $ (52,430,000) $ (51,056,000)
Fair value of plan assets 14,194,000 14,846,000 17,605,000
Funded status (40,097,000) [1] (37,584,000) [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 (9,718,000) (9,839,000)  
Fair value of plan assets 8,486,000 8,251,000  
Funded status (1,232,000) (1,588,000)  
Marine Scheme
     
Reconciliation of funded status:      
Projected benefit obligation (44,573,000) (42,591,000)  
Fair value of plan assets 5,708,000 6,595,000  
Funded status $ (38,865,000) $ (35,996,000)  
[1] The Company's plans are composed of two plans that are both underfunded as at December 31, 2012 and 2011.