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STOCKHOLDERS EQUITY (Details)
$ in Thousands
 1 Months Ended 6 Months Ended
Jul. 28, 2017
USD ($)
shares
Jan. 11, 2017
USD ($)
shares
Nov. 30, 2014
USD ($)
shares
Apr. 30, 2014
shares
Jun. 30, 2017
USD ($)
shares
Jun. 30, 2016
USD ($)
shares
Dec. 31, 2016
shares
Stockholders Equity              
Treasury stock shares acquired (in shares)         250,550 97,601  
Treasury stock shares acquired | $         $ 9,266 $ 2,609  
Group LP              
Stockholders Equity              
Number of units held by noncontrolling interest holders         28,286,746   33,698,300
Noncontrolling interests (as a percent)         51.00%   62.00%
Class A common stock              
Stockholders Equity              
Aggregate stock issuance (in shares)       15,263,653      
Common stock, shares issued         28,158,383   20,948,998
Common stock, shares outstanding         27,519,943   20,561,108
Number of shares of common stock to be issued upon exchange of a partnership unit       1 1    
Class A common stock | Follow-on Offering              
Stockholders Equity              
Issuance of new and sale of existing common stock (in shares)   5,750,000 6,325,000        
Issuance of Class A common stock and acquisition of Class A partnership units in connection with follow-on offering (in shares)   5,356,876 4,511,058        
Class A common stock | Follow-on Offering | Subsequent event              
Stockholders Equity              
Issuance of new and sale of existing common stock (in shares) 6,000,000            
Issuance of Class A common stock and acquisition of Class A partnership units in connection with follow-on offering (in shares) 5,680,903            
Class A common stock | Group LP              
Stockholders Equity              
Common stock, shares outstanding         27,519,943   20,561,108
Class B common stock              
Stockholders Equity              
Shares issued (in shares)       36,158,698      
Common stock, shares issued         25,726,639   31,138,193
Common stock, shares outstanding         25,726,639   31,138,193
Ratio of subscription price to the initial public offering price of shares of common stock       0.00055      
Dividends payable ratio to outstanding shares of publicly traded common stock       0.00055      
Class B common stock | Follow-on Offering              
Stockholders Equity              
Shares converted     2,998,322        
Shares issued upon conversion     1,658        
Conversion ratio     0.00055        
Number of shares repurchased and retired   5,356,876 1,509,131        
Value of stock repurchased and retired | $   $ 101 $ 28        
Class B common stock | Follow-on Offering | Subsequent event              
Stockholders Equity              
Number of shares repurchased and retired 5,680,903            
Value of stock repurchased and retired | $ $ 128