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PENSIONS - Net Periodic Benefit Costs (Details) - Pensions - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Components of net periodic benefit cost:      
Service cost $ 302 $ 379 $ 369
Interest cost 2,051 2,042 2,359
Expected return on plan assets (806) (946) (984)
Recognized actuarial loss 1,060 1,195 998
Net periodic benefit cost 2,607 $ 2,670 $ 2,742
Estimated net loss for defined benefit pension plans to be amortized from accumulated other comprehensive income into net periodic benefit cost in next fiscal year $ 1,200