Quarterly report pursuant to Section 13 or 15(d)

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

v3.8.0.1
TRANSACTIONS WITH AFFILIATES AND AFFILIATED ENTITIES (Narrative) (Details) - USD ($)
$ in Thousands, shares in Millions
 1 Months Ended 3 Months Ended 12 Months Ended
Dec. 31, 2017
Mar. 31, 2018
Dec. 31, 2017
Related Party Transaction [Line Items]      
Due to affiliates $ 1,786 $ 0 $ 1,786
Manager      
Related Party Transaction [Line Items]      
Payment for termination of management agreement $ 10,700   $ 10,700
Manager | Transition Services Agreement      
Related Party Transaction [Line Items]      
Costs for transition services agreement   $ 200  
Affiliated Entity      
Related Party Transaction [Line Items]      
Shares held by Fortress and affiliates (in shares)   6.8  
Stock options held by Fortress and affiliates (in shares)   3.9