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EQUITY (Details 6) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Equity [Roll Forward]      
Beginning balance $ 4,185,304 $ 2,937,548 $ 4,503,695
Dividends (46,590) (20,766)  
End balance 4,267,236 4,185,304 2,937,548
Retained Earnings [Member]      
Equity [Roll Forward]      
Beginning balance 366,404 317,950 536,190
Result for the period 155,304 69,220 (219,274)
Dividends (46,590) (20,766)  
Other increase (decreases)     1,034
End balance $ 475,118 $ 366,404 $ 317,950