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COMMITMENTS AND CONTINGENCIES (Narrative) (Details) - USD ($)
12 Months Ended
Dec. 31, 2019
May 17, 2019
Dec. 31, 2018
Total commitments $ 690,361,000    
Asset retirement obligation 0   $ 0
Indemnification Agreement [Member]      
Total commitments $ 12,800,000    
Lakeway Partnership [Member]      
Equity Method Investment, Ownership Percentage   51.00%  
Lakeway Partnership [Member] | MedEquities      
Equity Method Investment, Ownership Percentage   51.00%  
Minimum | Indemnification Agreement [Member]      
Indemnification agreement occurrence period 18 months    
Maximum | Indemnification Agreement [Member]      
Indemnification agreement occurrence period 72 months