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PENSIONS - Reconciliation of Benefit Obligation (Details) - Pensions - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Reconciliation of benefit obligation:      
Benefit obligation at January 1 $ 53,166 $ 50,564  
Service cost 379 369 $ 468
Interest cost 2,042 2,359 2,159
Actuarial (gain) loss (2,547) 3,700  
Foreign currency exchange rate changes (509) (686)  
Benefit payments (3,058) (3,140)  
Benefit obligation at December 31 49,473 53,166 $ 50,564
Accumulated benefit obligation $ 48,500 $ 51,800