Quarterly report pursuant to Section 13 or 15(d)

TRANSACTIONS WITH AFFILIATES AND AFFILIATED ENTITIES (Narrative) (Details)

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TRANSACTIONS WITH AFFILIATES AND AFFILIATED ENTITIES (Narrative) (Details) - USD ($)
$ in Thousands, shares in Millions
 1 Months Ended 3 Months Ended 9 Months Ended
Dec. 31, 2017
Sep. 30, 2018
Sep. 30, 2018
Related Party Transaction [Line Items]      
Due to affiliates $ 1,786 $ 0 $ 0
Manager      
Related Party Transaction [Line Items]      
Payment for termination of management agreement $ 10,700    
Manager | Transition Services Agreement      
Related Party Transaction [Line Items]      
Costs for transition services agreement   $ 100 $ 400
Affiliated Entity      
Related Party Transaction [Line Items]      
Shares held by Fortress and affiliates (in shares)   7.3 7.3
Stock options held by Fortress and affiliates (in shares)   2.7 2.7
Accrued rent, related parties   $ 700 $ 700
Board of Director member      
Related Party Transaction [Line Items]      
Travel expense, related party     $ 100