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INVESTMENTS IN AFFILIATES AND JOINT VENTURES - Components (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Equity Method Investments and Joint Ventures [Abstract]      
Cost $ 877,810 $ 746,918  
Dividend (287,263) (234,597)  
Equity in net earnings of other affiliates 107,553 133,001  
Share of other comprehensive income in affiliate 5,125 3,458  
Equity in net assets of affiliates $ 703,225 $ 648,780 $ 541,565