Real Estate and Other Activities - Schedule of Concentrations of Credit Risk (Details) - USD ($) $ in Thousands	3 Months Ended			9 Months Ended		12 Months Ended
	Sep. 30, 2023		Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2022
Business Acquisition [Line Items]
Total Assets	$ 19,004,882			$ 19,004,882		$ 19,658,000
Total Revenues	306,576		$ 352,339	994,182	$ 1,162,365
Total Gross Assets [Member] | Operator Concentration Risk [Member]
Business Acquisition [Line Items]
Total Assets	19,004,882			$ 19,004,882		$ 19,658,000
Percentage of concentration risk				100.00%		100.00%
Total Gross Assets [Member] | Operator Concentration Risk [Member] | Other Assets [Member]
Business Acquisition [Line Items]
Total Assets	2,435,976			$ 2,435,976		$ 1,611,159
Percentage of concentration risk				12.80%		8.20%
Total Gross Assets [Member] | Operator Concentration Risk [Member] | Steward [Member]
Business Acquisition [Line Items]
Total Assets	3,768,586			$ 3,768,586		$ 4,762,673
Percentage of concentration risk				19.80%		24.20%
Total Gross Assets [Member] | Operator Concentration Risk [Member] | Circle [Member]
Business Acquisition [Line Items]
Total Assets	2,043,689			$ 2,043,689		$ 2,062,474
Percentage of concentration risk				10.80%		10.50%
Total Gross Assets [Member] | Operator Concentration Risk [Member] | Priory [Member]
Business Acquisition [Line Items]
Total Assets	1,339,742			$ 1,339,742		$ 1,290,213
Percentage of concentration risk				7.00%		6.60%
Total Gross Assets [Member] | Operator Concentration Risk [Member] | Prospect [Member]
Business Acquisition [Line Items]
Total Assets	1,065,752			$ 1,065,752		$ 1,483,599
Percentage of concentration risk				5.60%		7.50%
Total Gross Assets [Member] | Operator Concentration Risk [Member] | Lifepoint Behavioral [Member]
Business Acquisition [Line Items]
Total Assets	806,350			$ 806,350		$ 985,959
Percentage of concentration risk				4.20%		5.00%
Total Gross Assets [Member] | Operator Concentration Risk [Member] | Other Operators [Member]
Business Acquisition [Line Items]
Total Assets	7,544,787			$ 7,544,787		$ 7,461,923
Percentage of concentration risk				39.80%		38.00%
Total Gross Assets [Member] | Geographic Concentration [Member]
Business Acquisition [Line Items]
Total Assets	19,004,882			$ 19,004,882		$ 19,658,000
Percentage of concentration risk				100.00%		100.00%
Total Gross Assets [Member] | Geographic Concentration [Member] | Texas [Member]
Business Acquisition [Line Items]
Total Assets	2,009,435			$ 2,009,435		$ 1,967,948
Percentage of concentration risk				10.60%		10.00%
Total Gross Assets [Member] | Geographic Concentration [Member] | California [Member]
Business Acquisition [Line Items]
Total Assets	1,227,372			$ 1,227,372		$ 1,450,112
Percentage of concentration risk				6.40%		7.40%
Total Gross Assets [Member] | Geographic Concentration [Member] | Florida [Member]
Business Acquisition [Line Items]
Total Assets	1,356,050			$ 1,356,050		$ 1,324,555
Percentage of concentration risk				7.10%		6.80%
Total Gross Assets [Member] | Geographic Concentration [Member] | Utah [Member]
Business Acquisition [Line Items]
Total Assets	829,434			$ 829,434		$ 1,224,484
Percentage of concentration risk				4.40%		6.20%
Total Gross Assets [Member] | Geographic Concentration [Member] | Massachusetts [Member]
Business Acquisition [Line Items]
Total Assets	844,804			$ 844,804		$ 761,694
Percentage of concentration risk				4.50%		3.90%
Total Gross Assets [Member] | Geographic Concentration [Member] | All Other States [Member]
Business Acquisition [Line Items]
Total Assets	3,757,534			$ 3,757,534		$ 4,245,306
Percentage of concentration risk				19.80%		21.60%
Total Gross Assets [Member] | Geographic Concentration [Member] | Total U.S. [Member]
Business Acquisition [Line Items]
Total Assets	11,800,603			$ 11,800,603		$ 12,003,045
Percentage of concentration risk				62.10%		61.10%
Total Gross Assets [Member] | Geographic Concentration [Member] | United Kingdom [Member]
Business Acquisition [Line Items]
Total Assets	4,108,393			$ 4,108,393		$ 4,083,244
Percentage of concentration risk				21.60%		20.80%
Total Gross Assets [Member] | Geographic Concentration [Member] | Australia [Member]
Business Acquisition [Line Items]
Total Assets	290,321			$ 290,321		$ 854,582
Percentage of concentration risk				1.50%		4.30%
Total Gross Assets [Member] | Geographic Concentration [Member] | Switzerland [Member]
Business Acquisition [Line Items]
Total Assets	683,991			$ 683,991		$ 748,947
Percentage of concentration risk				3.60%		3.80%
Total Gross Assets [Member] | Geographic Concentration [Member] | Germany [Member]
Business Acquisition [Line Items]
Total Assets	716,959			$ 716,959		$ 664,900
Percentage of concentration risk				3.80%		3.40%
Total Gross Assets [Member] | Geographic Concentration [Member] | Spain [Member]
Business Acquisition [Line Items]
Total Assets	233,724			$ 233,724		$ 222,316
Percentage of concentration risk				1.20%		1.10%
Total Gross Assets [Member] | Geographic Concentration [Member] | All Other Countries [Member]
Business Acquisition [Line Items]
Total Assets	510,889			$ 510,889		$ 498,753
Percentage of concentration risk				2.70%		2.50%
Total Gross Assets [Member] | Geographic Concentration [Member] | Total International [Member]
Business Acquisition [Line Items]
Total Assets	7,204,279			$ 7,204,279		$ 7,654,955
Percentage of concentration risk				37.90%		38.90%
Total Gross Assets [Member] | Geographic Concentration [Member] | Other Domestic Assets [Member]
Business Acquisition [Line Items]
Total Assets	1,775,974			$ 1,775,974		$ 1,028,946
Percentage of concentration risk				9.30%		5.20%
Total Gross Assets [Member] | Geographic Concentration [Member] | Other International Assets [Member]
Business Acquisition [Line Items]
Total Assets	660,002			$ 660,002		$ 582,213
Percentage of concentration risk				3.50%		3.00%
Total Gross Assets [Member] | Customer Concentration Risk [Member]
Business Acquisition [Line Items]
Total Assets	$ 19,004,882			$ 19,004,882		$ 19,658,000
Maximum percentage of entity's assets invested on single property	2.00%			2.00%
Percentage of concentration risk				100.00%
Total Gross Assets [Member] | Customer Concentration Risk [Member] | General Acute Care Hospitals [Member]
Business Acquisition [Line Items]
Total Assets	$ 12,105,205			$ 12,105,205		$ 13,386,376
Percentage of concentration risk				63.70%		68.10%
Total Gross Assets [Member] | Customer Concentration Risk [Member] | Behavioral Health Facilities [Member]
Business Acquisition [Line Items]
Total Assets	2,525,664			$ 2,525,664		$ 2,727,326
Percentage of concentration risk				13.30%		13.90%
Total Gross Assets [Member] | Customer Concentration Risk [Member] | Inpatient Rehabilitation Hospitals [Member]
Business Acquisition [Line Items]
Total Assets	1,430,494			$ 1,430,494		$ 1,418,603
Percentage of concentration risk				7.50%		7.20%
Total Gross Assets [Member] | Customer Concentration Risk [Member] | Long Term Acute Care Hospital [Member]
Business Acquisition [Line Items]
Total Assets	274,971			$ 274,971		$ 277,772
Percentage of concentration risk				1.50%		1.40%
Total Gross Assets [Member] | Customer Concentration Risk [Member] | Freestanding ER/Urgent Care Facilities [Member]
Business Acquisition [Line Items]
Total Assets	232,572			$ 232,572		$ 236,764
Percentage of concentration risk				1.20%		1.20%
Total Gross Assets [Member] | Customer Concentration Risk [Member] | Other Assets [Member]
Business Acquisition [Line Items]
Total Assets	$ 2,435,976			$ 2,435,976		$ 1,611,159
Percentage of concentration risk				12.80%		8.20%
Revenue [Member] | Operator Concentration Risk [Member]
Business Acquisition [Line Items]
Percentage of concentration risk	100.00%		100.00%
Total Revenues	$ 306,576		$ 352,339
Revenue [Member] | Operator Concentration Risk [Member] | Steward [Member]
Business Acquisition [Line Items]
Percentage of concentration risk	23.00%	[1]	28.70%
Total Revenues	$ 70,664		$ 101,262
Revenue [Member] | Operator Concentration Risk [Member] | Circle [Member]
Business Acquisition [Line Items]
Percentage of concentration risk	16.10%		12.90%
Total Revenues	$ 49,207		$ 45,531
Revenue [Member] | Operator Concentration Risk [Member] | Priory [Member]
Business Acquisition [Line Items]
Percentage of concentration risk	9.20%		5.30%
Total Revenues	$ 28,335		$ 18,611
Revenue [Member] | Operator Concentration Risk [Member] | Common Spirit [Member]
Business Acquisition [Line Items]
Percentage of concentration risk	9.60%
Total Revenues	$ 29,355
Revenue [Member] | Operator Concentration Risk [Member] | Lifepoint Behavioral [Member]
Business Acquisition [Line Items]
Percentage of concentration risk	6.10%		6.20%
Total Revenues	$ 18,553		$ 21,960
Revenue [Member] | Operator Concentration Risk [Member] | Ernest [Member]
Business Acquisition [Line Items]
Percentage of concentration risk	5.90%		4.40%
Total Revenues	$ 18,225		$ 15,530
Revenue [Member] | Operator Concentration Risk [Member] | Other Operators [Member]
Business Acquisition [Line Items]
Percentage of concentration risk	30.10%		42.50%
Total Revenues	$ 92,237		$ 149,445
Revenue [Member] | Geographic Concentration [Member]
Business Acquisition [Line Items]
Percentage of concentration risk	100.00%		100.00%
Total Revenues	$ 306,576		$ 352,339
Revenue [Member] | Geographic Concentration [Member] | Texas [Member]
Business Acquisition [Line Items]
Percentage of concentration risk	13.20%		11.80%
Total Revenues	$ 40,423		$ 41,572
Revenue [Member] | Geographic Concentration [Member] | Florida [Member]
Business Acquisition [Line Items]
Percentage of concentration risk	9.30%		7.30%
Total Revenues	$ 28,443		$ 25,572
Revenue [Member] | Geographic Concentration [Member] | Utah [Member]
Business Acquisition [Line Items]
Percentage of concentration risk	10.00%		9.80%
Total Revenues	$ 30,559		$ 34,701
Revenue [Member] | Geographic Concentration [Member] | Arizona [Member]
Business Acquisition [Line Items]
Percentage of concentration risk	5.60%		4.70%
Total Revenues	$ 17,056		$ 16,442
Revenue [Member] | Geographic Concentration [Member] | Ohio [Member]
Business Acquisition [Line Items]
Percentage of concentration risk	3.00%		3.10%
Total Revenues	$ 9,303		$ 10,839
Revenue [Member] | Geographic Concentration [Member] | All Other States [Member]
Business Acquisition [Line Items]
Percentage of concentration risk	20.80%		32.80%
Total Revenues	$ 64,044		$ 115,677
Revenue [Member] | Geographic Concentration [Member] | Total U.S. [Member]
Business Acquisition [Line Items]
Percentage of concentration risk	61.90%		69.50%
Total Revenues	$ 189,828		$ 244,803
Revenue [Member] | Geographic Concentration [Member] | United Kingdom [Member]
Business Acquisition [Line Items]
Percentage of concentration risk	29.60%		21.60%
Total Revenues	$ 90,655		$ 76,191
Revenue [Member] | Geographic Concentration [Member] | Germany [Member]
Business Acquisition [Line Items]
Percentage of concentration risk	3.30%		2.20%
Total Revenues	$ 10,000		$ 7,926
Revenue [Member] | Geographic Concentration [Member] | All Other Countries [Member]
Business Acquisition [Line Items]
Percentage of concentration risk	5.20%		6.70%
Total Revenues	$ 16,093		$ 23,419
Revenue [Member] | Geographic Concentration [Member] | Total International [Member]
Business Acquisition [Line Items]
Percentage of concentration risk	38.10%		30.50%
Total Revenues	$ 116,748		$ 107,536

[1] Excluding the $49 million reserve in the 2023 third quarter related to a different operator, revenue concentration would have been 19.9%; in line with total assets concentration.