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OTHER OPERATING INCOME (EXPENSES), NET (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Other operating income (expenses), net [Abstract]      
Results of sundry assets $ 1,190 $ 1,270 $ 2,009
Other operating income 0 0 10,625
Other operating income 1,190 1,270 12,634
Provision for legal claims and other matters (2,783) (1,678) (3,180)
Other operating expense (14,647) (9,517) 0
Other operating expense 17,430 11,195 3,180
Other operating (expenses) income, net $ (16,240) $ (9,925) $ 9,454