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PENSIONS - Reconciliation of Benefit Obligation (Details) (Pensions, USD $)
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Pensions
      
Reconciliation of benefit obligation:      
Benefit obligation at January 1 $ 52,430,000 $ 51,056,000  
Service cost 429,000 459,000 485,000
Interest cost 2,361,000 2,729,000 2,891,000
Actuarial loss 3,890,000 1,751,000  
Foreign currency exchange rate changes 509,000 (114,000)  
Benefit payments (5,328,000) (3,451,000)  
Benefit obligation at December 31 54,291,000 52,430,000 51,056,000
Accumulated benefit obligation $ 52,200,000 $ 51,000,000