EQUITY - Narrative (Details)				3 Months Ended	8 Months Ended	12 Months Ended
	Oct. 28, 2016 USD ($) $ / shares shares	Jun. 30, 2016 USD ($)	Jun. 28, 2016 USD ($) shares	Mar. 31, 2017 $ / shares shares	Mar. 31, 2017 USD ($) $ / shares shares	Dec. 31, 2016 $ / shares shares	Aug. 02, 2016 USD ($) $ / shares	Jul. 31, 2016
Class of Stock [Line Items]
Common stock, shares authorized				500,000,000	500,000,000	500,000,000
Common stock, par value (in dollars per share) | $ / shares				$ 0.01	$ 0.01	$ 0.01
Preferred stock, shares authorized				100,000,000	100,000,000	100,000,000
Preferred stock, par value (in dollars per share) | $ / shares				$ 0.01	$ 0.01	$ 0.01
Undesignated preferred stock
Class of Stock [Line Items]
Preferred stock, shares authorized				90,600,000	90,600,000
9.25% Series A Preferred Stock
Class of Stock [Line Items]
Payments for repurchase of redeemable preferred shares | $	$ 50,700,000
Preferred stock, shares outstanding	2,000,000
Preferred stock, redemption price per share | $ / shares	$ 25
Preferred stock, liquidation preference (in dollars per share) | $ / shares				$ 25	$ 25
7.875% Series B Preferred Stock
Class of Stock [Line Items]
Preferred stock, shares authorized				3,000,000	3,000,000
Preferred stock, dividend rate (as a percent)				7.875%		7.875%
Preferred stock, shares outstanding				3,000,000	3,000,000	3,000,000
Preferred stock, liquidation preference (in dollars per share) | $ / shares				$ 25	$ 25
Annual dividend rate per share (in dollars per share) | $ / shares				$ 1.96875
7.875% Series B Preferred Stock | Maximum
Class of Stock [Line Items]
Ratio for conversion				5.6497
7.125% Series C Preferred Stock
Class of Stock [Line Items]
Preferred stock, shares authorized				3,400,000	3,400,000
Preferred stock, dividend rate (as a percent)				7.125%		7.125%
Preferred stock, shares outstanding				3,400,000	3,400,000	3,400,000
Preferred stock, liquidation preference (in dollars per share) | $ / shares				$ 25	$ 25
Annual dividend rate per share (in dollars per share) | $ / shares				$ 1.78125
7.125% Series C Preferred Stock | Maximum
Class of Stock [Line Items]
Ratio for conversion				5.1440
6.450% Series D Preferred Stock
Class of Stock [Line Items]
Preferred stock, shares authorized				3,000,000	3,000,000
Preferred stock, dividend rate (as a percent)				6.45%		6.45%
Preferred shares offered during period, shares			3,000,000
Net proceeds from preferred shares offering | $			$ 72,300,000
Preferred shares offering underwriting discount and offering-related expenses | $			$ 2,700,000
Preferred stock, shares outstanding				3,000,000	3,000,000	3,000,000
Preferred stock, liquidation preference (in dollars per share) | $ / shares				$ 25	$ 25
Annual dividend rate per share (in dollars per share) | $ / shares				$ 1.6125
6.450% Series D Preferred Stock | Maximum
Class of Stock [Line Items]
Ratio for conversion				3.9216
Operating partnership | Non-controlling Interests in Operating Partnership
Class of Stock [Line Items]
Number of common units of operating partnership owned by unaffiliated third parties				386,056	386,056	396,713
Percentage of limited partnership interest in operating partnership (less than)				1.00%		1.00%
Leasehold Venture
Class of Stock [Line Items]
Payments to acquire interest in joint venture | $		$ 400,000
Ownership interest in joint venture (as a percent)								100.00%
ATM Program 2016
Class of Stock [Line Items]
Common stock, par value (in dollars per share) | $ / shares							$ 0.01
Common stock, shares authorized, amount | $							$ 125,000,000.0
Compensation entitled as percentage of gross proceeds of shares sold under sales agreements							2.00%
Preferred shares offered during period, shares					6,151,514
Net proceeds from preferred shares offering | $					$ 89,100,000
ATM Program 2016 | 6.450% Series D Preferred Stock
Class of Stock [Line Items]
Preferred stock, par value (in dollars per share) | $ / shares							$ 0.01
Preferred stock, dividend rate (as a percent)					6.45%