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SUBSEQUENT EVENTS (Details) - USD ($)
$ / shares in Units, $ in Thousands
1 Months Ended 3 Months Ended 6 Months Ended
Jul. 28, 2017
Jul. 24, 2017
Jan. 11, 2017
Nov. 30, 2014
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Class A common stock                
Subsequent events                
Dividends declared per share         $ 1.37 $ 0.30 $ 1.74 $ 1.4
Subsequent event                
Subsequent events                
Dividends declared per share   $ 0.37            
Follow-on Offering | Class A common stock                
Subsequent events                
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        
Follow-on Offering | Class B common stock                
Subsequent events                
Number of shares repurchased and retired     5,356,876 1,509,131        
Value of stock repurchased and retired     $ 101 $ 28        
Follow-on Offering | Subsequent event | Class A common stock                
Subsequent events                
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              
Issuance of shares from sales by current shareholders 319,097              
Follow-on Offering | Subsequent event | Class B common stock                
Subsequent events                
Number of shares repurchased and retired 5,680,903              
Value of stock repurchased and retired $ 128