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EMPLOYEE BENEFIT PLANS (Details 2) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Amounts recognized in the statement of financial position      
Noncurrent assets/(liabilities) $ 5,341 $ 17,595  
Amounts recognized in accumulated other comprehensive income      
Net actuarial loss 76,362 61,598  
Changes in pension liability (charged) credited to other comprehensive income (loss) $ (14,800) $ 19,000 $ 3,000