Annual report pursuant to Section 13 and 15(d)

EMPLOYEE BENEFIT PLANS - Amounts Recognized in Statement of Financial Position and Accumulated Other Comprehensive Income (Details)

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EMPLOYEE BENEFIT PLANS - Amounts Recognized in Statement of Financial Position and Accumulated Other Comprehensive Income (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Amounts recognized in the statement of financial position      
Noncurrent assets/(liabilities) $ 17,595 $ (2,880)  
Amounts recognized in accumulated other comprehensive income      
Net actuarial loss 61,598 80,662  
Changes in pension liability (charged) credited to other comprehensive income (loss) $ 19,000 $ 3,000 $ 14,800