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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 |  |  |  |  |  |  |

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