PERMANENT AND TEMPORARY EQUITY - Narrative (Details) - USD ($) $ / shares in Units, $ in Thousands		1 Months Ended	12 Months Ended
	Sep. 21, 2021	Sep. 30, 2021	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Temporary Equity [Line Items]
Acquisition-related activity		$ 751,200		$ 751,248
Common stock outstanding percentage of beneficial ownership acquired threshold for excess shares			9.00%
Preferred stock outstanding percentage of beneficial ownership acquired threshold for excess shares			9.90%
Maximum deferral payment period of purchase price for excess shares			5 years
Number of excess shares held by trustee			0
New Senior Investment Group Inc. Acquisition
Temporary Equity [Line Items]
Number of shares issued in transaction (in shares)	13,300,000
At The Market Equity Offering Program
Temporary Equity [Line Items]
Equity offering program, authorized offering amount			$ 1,000,000
Stock issued during period, shares, new issues, equity offering program (in shares)			0	10,900,000	1,500,000
Gross proceeds				$ 626,400	$ 66,600
Average gross price (USD per share)				$ 57.71	$ 44.88