SUBSEQUENT EVENTS (Details) $ / shares in Units, $ in Thousands		2 Months Ended	12 Months Ended
	Feb. 01, 2019 $ / shares	Feb. 26, 2019 USD ($)	Dec. 31, 2018 USD ($) hotel	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Feb. 12, 2019 USD ($) hotel	Apr. 30, 2017 USD ($) hotel
Subsequent events
Purchase price to acquire fee simple interest in real estate			$ 71,002	$ 588,822	$ 244,714
Number of hotels | hotel			77
6.45% Series D Preferred Stock
Subsequent events
Preferred stock, dividend rate (as a percent)			6.45%	6.45%
6.25% Series E Preferred Stock
Subsequent events
Preferred stock, dividend rate (as a percent)			6.25%	6.25%
Subsequent events
Subsequent events
Cash dividends declared, common stock (in dollars per share) | $ / shares	$ 0.18
Subsequent events | 6.45% Series D Preferred Stock
Subsequent events
Cash dividends declared, preferred stock (in dollars per share) | $ / shares	0.403125
Subsequent events | 6.25% Series E Preferred Stock
Subsequent events
Cash dividends declared, preferred stock (in dollars per share) | $ / shares	$ 0.390625
Baltimore (Hunt Valley), MD | Subsequent events
Subsequent events
Purchase price to acquire fee simple interest in real estate		$ 4,100
Disposed of by Sale
Subsequent events
Number of hotels | hotel							23
Aggregate sale price			$ 107,250	$ 120,153			$ 325,100
Two Hotel Properties Sold On February 12, 2019 | Disposed of by Sale | Subsequent events
Subsequent events
Number of hotels | hotel						2
Aggregate sale price						$ 11,600