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AFFILIATE NOTES PAYABLE (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2017
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Debt Instrument [Line Items]        
Conversion of affiliate notes payable to capital contribution $ 86,298 $ 86,298 $ 379,947 $ 0
Affiliate notes payable   $ 0 $ 86,298  
Notes Payable [Member]        
Debt Instrument [Line Items]        
Debt fixed interest rate   2.50%    
Debt instrument term   5 years