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PENSIONS - Reconciliation of Benefit Obligation (Details) (Pensions, USD $)
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Pensions
      
Reconciliation of benefit obligation:      
Benefit obligation at January 1 $ 54,291,000 $ 52,430,000  
Service cost 468,000 429,000 459,000
Interest cost 2,159,000 2,361,000 2,729,000
Actuarial loss (3,513,000) 3,890,000  
Foreign currency exchange rate changes 164,000 509,000  
Benefit payments (3,005,000) (5,328,000)  
Benefit obligation at December 31 50,564,000 54,291,000 52,430,000
Accumulated benefit obligation $ 48,900,000 $ 52,200,000