EQUITY STRUCTURE AND ACCOUNTS (Details) $ / shares in Units, $ in Thousands									1 Months Ended	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 01, 2016 $ / shares	Jun. 01, 2016 $ / shares	Mar. 01, 2016 $ / shares	Jan. 21, 2016 USD ($) $ / shares shares	Sep. 01, 2015 $ / shares	Jun. 08, 2015 $ / shares	Mar. 12, 2015 $ / shares	Feb. 11, 2014 USD ($)	Feb. 10, 2014 $ / shares	Sep. 30, 2016 $ / shares	Sep. 30, 2015 $ / shares	Sep. 30, 2016 USD ($) Class_of_Stock Vote $ / shares shares	Sep. 30, 2015 $ / shares	Dec. 31, 2015 USD ($)
Class of Stock [Line Items]
Number of classes of common stock | Class_of_Stock												2
Dividends paid | $												$ 52,829		$ 57,390
Series REIT LP Units
Class of Stock [Line Items]
Exchange of noncontrolling interest for common stock (in shares)												4,135,309
Common stock issued as dividends (in shares)				10,075,793
Series TRS LP Units
Class of Stock [Line Items]
Exchange of noncontrolling interest for common stock (in shares)												4,135,309
Common Units
Class of Stock [Line Items]
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%
Class A common stock
Class of Stock [Line Items]
Number of votes per share | Vote												1
Exchange of noncontrolling interest for common stock (in shares)												(4,135,309)
Dividends paid | $				$ 15,500
Dividends, share-based compensation stock value | $				$ 500
Common stock issued as dividends (in shares)				5,607,762
Common stock equivalent dividends paid | $				$ 64,100
Dividends per share of common stock (in dollars per share) | $ / shares	$ 0.275	$ 0.275	$ 0.275	$ 1.45	$ 0.275	$ 0.25	$ 0.25			$ 0.275	$ 0.275	$ 0.825	$ 0.775
Common stock, dividends, weighted average price per share | $ / shares				$ 11.43
Costs directly attributable to the Company's IPO | $								$ 20,500
Class B common stock
Class of Stock [Line Items]
Number of votes per share | Vote												1
Exchange of noncontrolling interest for common stock (in shares)												4,135,309
Common stock issued as dividends (in shares)				4,468,031