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COMMITMENTS (Details 2) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Commitments      
Minimum operating lease payments $ 579,551 $ 568,979 $ 525,134
Total $ 579,551 $ 568,979 $ 525,134