CONSOLIDATED STATEMENTS OF CASH FLOWS - Supplemental (Parenthetical) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
SUPPLEMENTAL CASH FLOW INFORMATION:
Interest paid	$ 201,153	$ 235,994	$ 195,599
Income taxes paid	935	2,798	399
Decrease in assets and liabilities resulting from the deconsolidation of investments that were previously consolidated:
Real estate, net	(355,669)	(686,320)	0
Mortgage notes, net	0	618,452	0
Real estate improvements accrued, not paid	32,064	20,031	18,097
Capitalized interest	0	1,297	1,833
Joint venture | AlerisLife Inc
Decrease in assets and liabilities resulting from the deconsolidation of investments that were previously consolidated:
Restructuring transaction additional consideration	0	0	(75,000)
AlerisLife Inc
Decrease in assets and liabilities resulting from the deconsolidation of investments that were previously consolidated:
AlerisLife Inc. common stock	0	0	97,896
NON-CASH FINANCING ACTIVITIES:
Distribution to common shareholders of the right to receive AlerisLife Inc. common stock	$ 0	$ 0	$ (59,801)