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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 |  |  |  |  |  |

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