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STOCK-BASED COMPENSATION Summary of Performance Stock Unit Activity (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
3 Months Ended 12 Months Ended
Jun. 30, 2018
Dec. 31, 2018
Weighted-Average Remaining Contractual Term    
Outstanding   1 year 5 months
Aggregate Intrinsic Value    
Share Price   $ 4.73
Performance Shares    
Number of Shares Outstanding    
Outstanding, beginning balance (in shares)   0
Granted (in shares) 1,440 1,477
Vested (in shares)   0
Canceled (in shares)   (147)
Outstanding, ending balance (in shares)   1,330
Number of shares outstanding, expected to vest (in shares)   1,330
Weighted Average Fair Value per Share at Grant Date    
Outstanding, beginning balance (in usd per share)  
Granted (in usd per share) $ 4.57 4.65
Vested (in usd per share)  
Canceled (in usd per share)  
Outstanding, ending balance (in usd per share)   4.66
Weighted-Average Fair Value per Share at Grant Date, Expected to vest (in usd per share)   $ 4.66
Weighted-Average Remaining Contractual Term    
Outstanding   3 months
Expected to vest   3 months
Aggregate Intrinsic Value    
Outstanding   $ 6,291
Expected to vest   $ 6,291