SUBSEQUENT EVENTS (Details) $ / shares in Units, $ in Millions			3 Months Ended	8 Months Ended	12 Months Ended
	Apr. 28, 2017 $ / shares	Apr. 27, 2017 USD ($) Property	Mar. 31, 2017 USD ($)	Sep. 30, 2016 USD ($)	Dec. 31, 2016 Property
Subsequent Event
Subsequent events
Cash dividends declared, common stock (in dollars per share)	$ 0.17
7.875% Series B Preferred Stock
Subsequent events
Preferred stock, dividend rate (as a percent)			7.875%		7.875%
7.875% Series B Preferred Stock | Subsequent Event
Subsequent events
Cash dividends declared, preferred stock (in dollars per share)	0.4921875
7.125% Series C Preferred Stock
Subsequent events
Preferred stock, dividend rate (as a percent)			7.125%		7.125%
7.125% Series C Preferred Stock | Subsequent Event
Subsequent events
Cash dividends declared, preferred stock (in dollars per share)	0.4453125
6.450% Series D Preferred Stock
Subsequent events
Preferred stock, dividend rate (as a percent)			6.45%		6.45%
6.450% Series D Preferred Stock | Subsequent Event
Subsequent events
Cash dividends declared, preferred stock (in dollars per share)	$ 0.403125
Portfolio of Hotels, Reinstatement Agreement, New ARCH Purchaser
Subsequent events
Number of hotels sold | Property					2
Net gain on sale of properties | $			$ 15.0	$ 5.0
Disposed of by Sale | Portfolio of Hotels, Reinstatement Agreement, New ARCH Purchaser | Subsequent Event
Subsequent events
Number of hotels sold | Property		7
Aggregate sales price | $		$ 66.8
Net gain on sale of properties | $		$ 16.0