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NET INCOME (LOSS) PER SHARE ATTRIBUTABLE TO CLASS A COMMON SHAREHOLDERS (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Apr. 30, 2014
Numerator:          
Net income (loss) attributable to holders of shares of Class A common stock - basic $ 6,893 $ 7,131 $ 13,863 $ 12,467  
Class A common stock          
Numerator:          
Net income (loss) attributable to holders of shares of Class A common stock - basic 6,893 7,131 13,863 12,467  
Net income (loss) attributable to holders of shares of Class A common stock - diluted $ 6,893 $ 7,131 $ 13,863 $ 12,467  
Denominator:          
Weighted average shares of Class A common stock outstanding - basic 20,745,043 19,978,108 20,654,657 19,961,286  
Weighted average number of incremental shares issuable from unvested restricted stock, RSUs and stock options, as calculated using the treasury stock method 2,873,050 1,110,112 2,397,598 1,182,875  
Weighted average shares of Class A common stock outstanding-diluted 23,618,093 21,088,220 23,052,255 21,144,161  
Net income (loss) per share attributable to holders of shares of Class A common stock          
Basic (in dollars per share) $ 0.33 $ 0.36 $ 0.67 $ 0.62  
Diluted (in dollars per share) $ 0.29 $ 0.34 $ 0.60 $ 0.59  
Number of shares of common stock to be issued upon exchange of a partnership unit 1   1   1
Fully diluted shares of common stock outstanding if all Class A partnership units were to be exchanged for common stock immediately following the reorganization 57,386,765 55,248,459 56,911,313 55,321,222  
Class A common stock | Restricted stock and RSUs          
Net income (loss) per share attributable to holders of shares of Class A common stock          
Number of antidilutive securities excluded from calculation of diluted income (loss) per share 1,793 1,701,845 899 1,012,501  
Class A common stock | Stock options          
Net income (loss) per share attributable to holders of shares of Class A common stock          
Number of antidilutive securities excluded from calculation of diluted income (loss) per share 14,505 10,000 1,053,593 0