CONSOLIDATED STATEMENTS OF CASH FLOWS - Supplemental (Parenthetical) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
SUPPLEMENTAL CASH FLOW INFORMATION:
Interest paid	$ 195,599	$ 177,308	$ 164,996
Income taxes paid	399	452	474
NON-CASH INVESTING ACTIVITIES:
Acquisitions funded by assumed debt	0	0	(44,386)
Capitalized interest	1,833	1,124	124
Five Star
NON-CASH INVESTING ACTIVITIES:
Transaction Agreement additional consideration	(75,000)	0	0
NON-CASH FINANCING ACTIVITIES:
Assumption of mortgage notes payable	0	0	44,386
Five Star
NON-CASH INVESTING ACTIVITIES:
Five Star Senior Living Inc. common stock	97,896	0	0
NON-CASH FINANCING ACTIVITIES:
Stock Issued During Period, Value, New Issues	$ (59,801)	$ 0	$ 0