EQUITY STRUCTURE AND ACCOUNTS - Additional Information (Details)				3 Months Ended			12 Months Ended
	Jan. 24, 2017 USD ($) shares	Jan. 01, 2015 USD ($) $ / shares	Feb. 11, 2014 USD ($)	Mar. 31, 2017 USD ($) Class_of_Stock Vote $ / shares shares	Dec. 31, 2016 USD ($) $ / shares	Mar. 31, 2016 USD ($) $ / shares shares	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)	Oct. 30, 2014 USD ($)	Feb. 10, 2014 $ / shares
Class of Stock [Line Items]
Number of classes of common stock | Class_of_Stock				2
Purchase of treasury stock							$ 4,652,000
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
Dividends paid				$ 24,700,000			74,393,000
2014 Share Repurchase Authorization Program
Class of Stock [Line Items]
Percentage of aggregate common stock outstanding under Repurchase Program				3.90%
Series REIT LP Units
Class of Stock [Line Items]
Exchange of noncontrolling interest for common stock (in shares) | shares				(6,790,121)
Series TRS LP Units
Class of Stock [Line Items]
Exchange of noncontrolling interest for common stock (in shares) | shares				(6,790,121)
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				6,790,121
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
Dividends per share of common stock (in dollars per share) | $ / shares				$ 0.300	$ 0.46	$ 0.275
Common stock, dividends, weighted average price per share | $ / shares					$ 14.06
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			$ 50,000,000.0
Purchase of treasury stock (in shares) | shares				0		424,317
Treasury stock acquired, average cost (in dollars per share) | $ / shares						$ 10.96
Purchase of treasury stock				$ 0		$ 4,653,000
Remaining amount available for repurchase				$ 44,353,000	$ 44,353,000	$ 44,353,000	$ 44,353,000	$ 49,006,000
Share price (in dollars per share) | $ / shares				$ 14.44
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				(6,790,121)
Common stock issued as dividends (in shares) | shares	432,314
Series REIT LP Units
Class of Stock [Line Items]
Common stock issued as dividends (in shares) | shares	1,248,133