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EQUITY-BASED COMPENSATION - Equity Value Units (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Apr. 26, 2017
Jun. 30, 2017
Dec. 31, 2017
Equity Value Units      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Recapitalizing percentage     33.33%
Unrecognized share expense     $ 3.1
Recognition period     2 years
Equity Value Units, Equity Settled      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Units outstanding (in shares)     1,000,000
Equity Value Units, Cash Settled      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Units outstanding (in shares)     1,000,000
Units granted (in shares) 225,000    
Incremental compensation cost   $ 4.1