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EQUITY STRUCTURE AND ACCOUNTS (Details) $ / shares in Units, $ in Thousands |  | 1 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Feb. 11, 2014 USD ($) | Feb. 10, 2014 $ / shares | Sep. 30, 2015 USD ($) Class_of_Stock Vote shares | Sep. 30, 2014 USD ($) | Dec. 31, 2014 shares
Class of Stock [Line Items] |  |  |  |  |
Number of classes of common stock | Class_of_Stock |  |  | 2 |  |
Costs directly attributable to the Company's IPO | $ | $ 20,500 |  | $ 0 | $ 20,523 |
Class A common stock |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Number of votes per share | Vote |  |  | 1 |  |
Class B common stock |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Number of votes per share | Vote |  |  | 1 |  |
Series REIT LP Units |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Exchange of noncontrolling interest for common stock (in shares) |  |  | 3,415,389 |  |
Series TRS LP Units |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Exchange of noncontrolling interest for common stock (in shares) |  |  | 3,415,389 |  |
Common Units |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Exchange of noncontrolling interest for common stock (in shares) |  |  |  |  | 874,374
Second cash distributions to partners (as a percent) |  | 20.00% |  |  |
Second cash distributions after completion of second distribution (as a percent) |  | 20.00% |  |  |
Series A participating preferred units |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Second cash distributions to participating preferred units (as a percent) |  | 80.00% |  |  |
Specified amount up to which second distribution to participating preferred units required (in dollars per unit) | $ / shares |  | $ 124 |  |  |
Series A and Series B participating preferred units |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Second cash distributions after completion of second distribution (as a percent) |  | 80.00% |  |  |
Common Stock | Class A common stock |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Exchange of noncontrolling interest for common stock (in shares) |  |  | 3,415,389 |  | 874,374
Common Stock | Class B common stock |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Exchange of noncontrolling interest for common stock (in shares) |  |  | (3,415,389) |  | (874,374)

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