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)