SUBSEQUENT EVENTS (Details) $ / shares in Units, $ in Millions				1 Months Ended		3 Months Ended	12 Months Ended
	Apr. 29, 2022 $ / shares	Mar. 23, 2022 USD ($) hotel $ / shares	Jan. 13, 2022	May 03, 2022 USD ($)	Apr. 30, 2022 USD ($)	Mar. 31, 2022 hotel	Dec. 31, 2021	Dec. 31, 2019 Room
Disposed of by Sale | Hilton Garden Inn - South San Francisco, CA
Subsequent Event [Line Items]
Aggregate sales price		$ 75.0
Gain on sale of properties		$ 20.5
Hotels
Subsequent Event [Line Items]
Number of hotel properties | hotel						101
Hotels | Disposed of by Sale | Hilton Garden Inn - South San Francisco, CA
Subsequent Event [Line Items]
Number of hotel properties | hotel		169
Mezzanine loans
Subsequent Event [Line Items]
Initial Purchase Option, ownership percentage								90.00%
Mezzanine loans | Hotels
Subsequent Event [Line Items]
Number of hotel properties | Room								264
Subsequent Event | Disposed of by Sale | Hilton Garden Inn - South San Francisco, CA
Subsequent Event [Line Items]
Nonrefundable payment received on sale of properties				$ 7.5
Subsequent Event | Mezzanine loans
Subsequent Event [Line Items]
Exercise price of initial purchase option					$ 89.0
Initial Purchase Option exercise, expected payments received					29.9
Initial Purchase Option exercise, assumption of senior debt					47.0
Initial Purchase Option exercise, cash payment					$ 7.9
6.25% Series E Preferred Stock
Subsequent Event [Line Items]
Preferred stock, dividend rate						6.25%	6.25%
6.25% Series E Preferred Stock | Subsequent Event
Subsequent Event [Line Items]
Cash dividends declared, preferred stock (in dollars per share) | $ / shares	$ 0.390625
Preferred stock, dividend rate	6.25%
5.875% Series F Preferred Stock
Subsequent Event [Line Items]
Preferred stock, dividend rate						5.875%	5.875%
5.875% Series F Preferred Stock | Subsequent Event
Subsequent Event [Line Items]
Cash dividends declared, preferred stock (in dollars per share) | $ / shares	$ 0.3671875
Preferred stock, dividend rate	5.875%
Series Z Preferred Units
Subsequent Event [Line Items]
Cash dividends declared, preferred stock (in dollars per share) | $ / shares		$ 0.249660
Preferred stock, dividend rate			5.25%
Series Z Preferred Units | Subsequent Event
Subsequent Event [Line Items]
Cash dividends declared, preferred stock (in dollars per share) | $ / shares	$ 0.328125
Preferred stock, dividend rate	5.25%