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COSTS AND EXPENSES BY NATURE (Details 2) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Material income and expense [abstract]      
Bank loan interest $ 347,551 $ 352,405 $ 331,511
Financial leases 37,522 32,573 42,855
Other financial instruments 8,213 31,358 38,991
Total $ 393,286 $ 416,336 $ 413,357