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EQUITY STRUCTURE AND ACCOUNTS - Additional Information (Details)
$ / shares in Units, $ in Thousands
 3 Months Ended
Mar. 31, 2019
USD ($)
Vote
Class_of_Stock
$ / shares
shares
Mar. 31, 2018
USD ($)
shares
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Oct. 30, 2014
USD ($)
Class of Stock [Line Items]          
Number of classes of common stock | Class_of_Stock 2        
Closing price (in dollars per share) | $ / shares $ 17.02        
2014 Share Repurchase Authorization Program          
Class of Stock [Line Items]          
Remaining amount available for repurchase | $ $ 41,800        
Percentage of aggregate common stock outstanding under Repurchase Program 2.30%        
Series REIT LP Units          
Class of Stock [Line Items]          
Exchange of noncontrolling interest for common stock, units exchanged (in shares) 101,000 4,349,832      
Series TRS LP Units          
Class of Stock [Line Items]          
Exchange of noncontrolling interest for common stock, units exchanged (in shares) 101,000 4,349,832      
Class A Common Stock          
Class of Stock [Line Items]          
Number of votes per share | Vote 1        
Exchange of noncontrolling interest for common stock, units exchanged (in shares) 101,000        
Exchange of noncontrolling interest for common stock (in shares)   4,349,832      
Class A Common Stock | 2014 Share Repurchase Authorization Program          
Class of Stock [Line Items]          
Additional authorizations | $ $ 0 $ 0     $ 50,000
Purchase of treasury stock (in shares) 0 0      
Remaining amount available for repurchase | $ $ 41,769 $ 41,769 $ 41,769 $ 41,769  
Class B Common Stock          
Class of Stock [Line Items]          
Number of votes per share | Vote 1        
Exchange of noncontrolling interest for common stock, units exchanged (in shares) (101,000)        
Exchange of noncontrolling interest for common stock (in shares)   (4,349,832)