EQUITY STRUCTURE AND ACCOUNTS - Additional Information (Details)											1 Months Ended	3 Months Ended								12 Months Ended
	Jan. 24, 2017 USD ($) $ / shares shares	Dec. 02, 2016 $ / shares	Sep. 01, 2016 $ / shares	Jun. 01, 2016 $ / shares	Mar. 01, 2016 $ / shares	Dec. 01, 2015 $ / shares	Sep. 01, 2015 $ / shares	Jun. 08, 2015 $ / shares	Mar. 12, 2015 $ / shares	Feb. 11, 2014 USD ($)	Feb. 10, 2014 $ / shares	Dec. 31, 2016 USD ($) $ / shares	Sep. 30, 2016 $ / shares	Jun. 30, 2016 $ / shares	Mar. 31, 2016 $ / shares	Dec. 31, 2015 USD ($) $ / shares	Sep. 30, 2015 $ / shares	Jun. 30, 2015 $ / shares	Mar. 31, 2015 $ / shares	Dec. 31, 2016 USD ($) Class_of_Stock Vote $ / shares shares	Dec. 31, 2015 USD ($) $ / shares shares	Dec. 31, 2014 USD ($) $ / shares	Oct. 30, 2014 USD ($)
Class of Stock [Line Items]
Number of classes of common stock | Class_of_Stock																				2
Purchase of treasury stock																				$ (4,652,000)	$ (994,000)
Share price (in dollars per share) | $ / shares											$ 17.00
Earnings and Profits (E&P) distribution requirement																					$ 48,300,000
Earnings and Profits (E&P) distribution requirement (in dollars per share) | $ / shares																$ 0.90					$ 0.90
Dividends paid																				74,393,000	$ 57,390,000
Dividends per share of common stock (in dollars per share) | $ / shares												$ 0.460	$ 0.275	$ 0.275	$ 0.275	$ 1.450	$ 0.275	$ 0.250	$ 0.250
Costs directly attributable to the Company's IPO																				$ 0	$ 0	$ 20,523,000
2014 Share Repurchase Authorization Program
Class of Stock [Line Items]
Percentage of aggregate common stock outstanding under Repurchase Program												4.50%								4.50%
Series REIT LP Units
Class of Stock [Line Items]
Exchange of noncontrolling interest for common stock (in shares) | shares																				10,521,149
Series TRS LP Units
Class of Stock [Line Items]
Exchange of noncontrolling interest for common stock (in shares) | shares																				10,521,149
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) | shares																				(10,521,149)
Dividends per share of common stock (in dollars per share) | $ / shares		$ 0.460	$ 0.275	$ 0.275	$ 0.275	$ 1.450	$ 0.275	$ 0.250	$ 0.250											$ 1.285	$ 2.225	$ 0
Costs directly attributable to the Company's IPO										$ 20,500,000
Class A common stock | 2014 Share Repurchase Authorization Program
Class of Stock [Line Items]
Authorized amount of stock repurchase												$ 0				$ 0				$ 0	$ 0		$ 50,000,000.0
Purchase of treasury stock (in shares) | shares																				(424,317)	(84,203)
Treasury stock acquired, average cost (in dollars per share) | $ / shares																				$ 10.96	$ 11.81
Purchase of treasury stock																				$ (4,653,000)	$ (994,000)
Remaining amount available for repurchase												$ 44,353,000				$ 49,006,000				$ 44,353,000	$ 49,006,000	$ 50,000,000
Share price (in dollars per share) | $ / shares												$ 13.72								$ 13.72
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) | shares																				10,521,149
Subsequent Event | Class A common stock
Class of Stock [Line Items]
Dividends paid	$ 20,800,000
Dividends, share-based compensation stock value	$ 700,000
Common stock issued as dividends (in shares) | shares	815,819
Common stock equivalent dividends paid	$ 11,500,000
Common stock, dividends, weighted average price per share | $ / shares	$ 14.06
Subsequent Event | Class B common stock
Class of Stock [Line Items]
Common stock issued as dividends (in shares) | shares	432,314
Subsequent Event | Series REIT LP Units
Class of Stock [Line Items]
Common stock issued as dividends (in shares) | shares	1,248,133