Annual report pursuant to Section 13 and 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
 1 Months Ended 12 Months Ended
Dec. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Related Party Transaction [Line Items]        
Stock options outstanding (in shares) 5,010,576 8,436,931 5,010,576  
Due to affiliates $ 1,786 $ 0 $ 1,786  
Amount payable to aircraft operator for aircraft charter (less than) 100 $ 100 100 $ 100
Manager        
Related Party Transaction [Line Items]        
Termination payment $ (10,700)   $ (10,700) $ 0
Affiliates        
Related Party Transaction [Line Items]        
Number of shares owned by related party (in shares)   7,300,000    
Stock options outstanding (in shares)   2,700,000    
Rent expense   $ 1,100    
Transition Services Agreement | Manager        
Related Party Transaction [Line Items]        
Expenses incurred   $ 400