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PENSIONS - Reconciliation of Benefit Obligation (Details) - Pensions - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Reconciliation of benefit obligation:      
Benefit obligation at January 1 $ 49,473 $ 53,166  
Service cost 302 379 $ 369
Interest cost 2,051 2,042 2,359
Actuarial loss (gain) 3,547 (2,547)  
Foreign currency exchange rate changes (1,887) (509)  
Benefit payments (3,110) (3,058)  
Benefit obligation at December 31 50,376 49,473 $ 53,166
Accumulated benefit obligation $ 49,100 $ 48,500