EQUITY - Narrative (Details)	6 Months Ended	12 Months Ended
	Jun. 30, 2020 hotel $ / shares shares	Dec. 31, 2019 $ / shares shares
Class of Stock [Line Items]
Common stock, shares authorized | shares	500,000,000	500,000,000
Common stock, par value (in dollars per share) | $ / shares	$ 0.01	$ 0.01
Preferred stock, shares authorized | shares	100,000,000	100,000,000
Preferred stock, par value (in dollars per share) | $ / shares	$ 0.01	$ 0.01
Undesignated preferred stock
Class of Stock [Line Items]
Preferred stock, shares authorized | shares	90,600,000
6.45% Series D Preferred Stock
Class of Stock [Line Items]
Preferred stock, shares authorized | shares	3,000,000
Preferred stock, dividend rate	6.45%	6.45%
Preferred stock, liquidation preference (in dollars per share) | $ / shares	$ 25
Annual dividend rate per share (in dollars per share) | $ / shares	$ 1.6125
6.45% Series D Preferred Stock | Maximum
Class of Stock [Line Items]
Ratio for conversion	3.9216
6.25% Series E Preferred Stock
Class of Stock [Line Items]
Preferred stock, shares authorized | shares	6,400,000
Preferred stock, dividend rate	6.25%	6.25%
Preferred stock, liquidation preference (in dollars per share) | $ / shares	$ 25
Annual dividend rate per share (in dollars per share) | $ / shares	$ 1.5625
6.25% Series E Preferred Stock | Maximum
Class of Stock [Line Items]
Ratio for conversion	3.1686
Operating partnership | Non-controlling Interests
Class of Stock [Line Items]
Number of common units of operating partnership owned by unaffiliated third parties (in shares) | shares	175,442	209,021
Unaffiliated Third Parties | Operating partnership
Class of Stock [Line Items]
Limited partner capital account units conversion ratio	1
Five hotels acquired in 2019 through joint venture
Class of Stock [Line Items]
General partner, ownership interest	51.00%
Number of hotels acquired | hotel	5
Five hotels acquired in 2019 through joint venture | GIC
Class of Stock [Line Items]
Limited partner, ownership percentage	49.00%
Operating partnership | Non-controlling Interests
Class of Stock [Line Items]
Limited partner, ownership percentage	1.00%	1.00%