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OTHER LIABILITIES - NON CURRENT AND CURRENT (Schedule of amounts recognized in income statement) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Disclosure of other liabilities [Abstract]      
Current service cost $ 7,284 $ 6,555  
Interest cost 22,578 21,658  
Total included in labor costs $ 29,862 $ 28,213 $ 27,758