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RELATED-PARTY TRANSACTIONS - Executive Bonus Plan (Details) - Executive Bonus Plan - USD ($)
12 Months Ended
Aug. 06, 2018
Aug. 02, 2018
Dec. 31, 2018
Related Party Transaction [Line Items]      
Bonus plan term   5 years  
Deferred Compensation Arrangement With Individual, Multiplication Factor   5.00%  
Adjustment factor   100.00%  
Bonus pool as a percentage of adjusted total net gain from assets sold   8.75%  
Percent of bonus pool to be distributed in cash in following year   50.00%  
Percent of bonus pool to be distributed via RSUs   50.00%  
Percent used for RSU award determination 50.00%    
Compensation earned     $ 0
Ms. Timian-Palmer, CEO      
Related Party Transaction [Line Items]      
Bonus allocation   55.00%  
Mr. Webb, CFO      
Related Party Transaction [Line Items]      
Bonus allocation   45.00%