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EQUITY STRUCTURE AND ACCOUNTS - Additional Information (Details) $ / shares in Units, $ in Thousands | 3 Months Ended |  |  |
--- | --- | --- | --- | ---
Mar. 31, 2019 USD ($) Vote Class_of_Stock $ / shares shares | Mar. 31, 2018 USD ($) shares | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Oct. 30, 2014 USD ($)
Class of Stock [Line Items] |  |  |  |  |
Number of classes of common stock | Class_of_Stock | 2 |  |  |  |
Closing price (in dollars per share) | $ / shares | $ 17.02 |  |  |  |
2014 Share Repurchase Authorization Program |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Remaining amount available for repurchase | $ | $ 41,800 |  |  |  |
Percentage of aggregate common stock outstanding under Repurchase Program | 2.30% |  |  |  |
Series REIT LP Units |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Exchange of noncontrolling interest for common stock, units exchanged (in shares) | 101,000 | 4,349,832 |  |  |
Series TRS LP Units |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Exchange of noncontrolling interest for common stock, units exchanged (in shares) | 101,000 | 4,349,832 |  |  |
Class A Common Stock |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Number of votes per share | Vote | 1 |  |  |  |
Exchange of noncontrolling interest for common stock, units exchanged (in shares) | 101,000 |  |  |  |
Exchange of noncontrolling interest for common stock (in shares) |  | 4,349,832 |  |  |
Class A Common Stock | 2014 Share Repurchase Authorization Program |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Additional authorizations | $ | $ 0 | $ 0 |  |  | $ 50,000
Purchase of treasury stock (in shares) | 0 | 0 |  |  |
Remaining amount available for repurchase | $ | $ 41,769 | $ 41,769 | $ 41,769 | $ 41,769 |
Class B Common Stock |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Number of votes per share | Vote | 1 |  |  |  |
Exchange of noncontrolling interest for common stock, units exchanged (in shares) | (101,000) |  |  |  |
Exchange of noncontrolling interest for common stock (in shares) |  | (4,349,832) |  |  |

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