SUBSEQUENT EVENTS (Details) $ / shares in Units, $ in Thousands					6 Months Ended		12 Months Ended
	Aug. 01, 2017 USD ($)	Jul. 28, 2017 $ / shares	Jul. 21, 2017 USD ($) hotel	Jul. 13, 2017 USD ($) Room	Jun. 30, 2017 USD ($)	Jun. 30, 2016 USD ($)	Dec. 31, 2016	Apr. 27, 2017 USD ($)	Feb. 11, 2016 USD ($)
Subsequent events
Purchase price					$ 364,450	$ 109,000
7.875% Series B Preferred Stock
Subsequent events
Preferred stock, dividend rate					7.875%		7.875%
7.125% Series C Preferred Stock
Subsequent events
Preferred stock, dividend rate					7.125%		7.125%
6.450% Series D Preferred Stock
Subsequent events
Preferred stock, dividend rate					6.45%		6.45%
Reverse and forward 1031 Exchanges
Subsequent events
Deferred taxable gain on sale of hotels									$ 74,000
Reverse and forward 1031 Exchanges | Disposed of by Sale
Subsequent events
Deferred taxable gain on sale of hotels								$ 20,800
Subsequent Event
Subsequent events
Proceeds from repayment of real estate loans	$ 10,100
Cash dividends declared, common stock (in dollars per share) | $ / shares		$ 0.17
Subsequent Event | 7.875% Series B Preferred Stock
Subsequent events
Cash dividends declared, preferred stock (in dollars per share) | $ / shares		0.4921875
Subsequent Event | 7.125% Series C Preferred Stock
Subsequent events
Cash dividends declared, preferred stock (in dollars per share) | $ / shares		0.4453125
Subsequent Event | 6.450% Series D Preferred Stock
Subsequent events
Cash dividends declared, preferred stock (in dollars per share) | $ / shares		$ 0.403125
Subsequent Event | Disposed of by Sale
Subsequent events
Number of hotels sold | hotel			3
Subsequent Event | Fort Worth, TX | Disposed of by Sale
Subsequent events
Number of hotels sold | hotel			3
Aggregate sales price			$ 27,800
Net gain on sale of properties			8,000
Subsequent Event | Fort Worth, TX | Reverse and forward 1031 Exchanges
Subsequent events
Deferred taxable gain on sale of hotels			$ 8,800
Subsequent Event | AC Hotel by Marriott | Atlanta, GA
Subsequent events
Number of guestrooms | Room				255
Purchase price				$ 57,500