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PENSIONS - Net Periodic Benefit Costs (Details) - Pensions - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Components of net periodic benefit cost:      
Service cost $ 379 $ 369 $ 468
Interest cost 2,042 2,359 2,159
Expected return on plan assets (946) (984) (918)
Recognized actuarial loss 1,195 998 1,415
Net periodic benefit cost 2,670 $ 2,742 $ 3,124
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 $ 1,100