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EQUITY-BASED COMPENSATION - Partnership Units and 2014 Omnibus Incentive Plan (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016 | Mar. 31, 2015 | Apr. 30, 2014
Class A common stock |  |  |  |  |  |
Equity-based compensation |  |  |  |  |  |
Number of shares of common stock to be issued upon exchange of a partnership unit | 1 |  | 1 |  |  | 1
Class A common stock | Share repurchase program authorized first quarter 2015 |  |  |  |  |  |
Equity-based compensation |  |  |  |  |  |
Share value authorized for repurchase |  |  |  |  | $ 25,000 |
Stock Repurchase Program, Remaining Authorized Repurchase Amount | $ 20,000 |  | $ 20,000 |  |  |
Partnership units |  |  |  |  |  |
Equity-based compensation |  |  |  |  |  |
Units held by partners | 28,286,746 |  | 28,286,746 |  |  |
Unvested units held by partners | 459,656 |  | 459,656 |  |  |
Compensation expenses | $ 511 | $ 736 | $ 1,199 | $ 1,633 |  |
Unrecognized compensation expenses | $ 2,311 |  | $ 2,311 |  |  |
Weighted average period to recognize unrecognized compensation expense |  |  | 1 year 2 months 12 days |  |  |
Managing Directors | Partnership units | Minimum |  |  |  |  |  |
Equity-based compensation |  |  |  |  |  |
Vesting period |  |  | 5 years |  |  |
Managing Directors | Partnership units | Maximum |  |  |  |  |  |
Equity-based compensation |  |  |  |  |  |
Vesting period |  |  | 8 years |  |  |
Non-managing director employees | Partnership units |  |  |  |  |  |
Equity-based compensation |  |  |  |  |  |
Vesting period |  |  | 4 years |  |  |

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