Acquisitions, Dispositions and Mortgage Repayments - Assets Acquired and Liabilities Assumed (Details) - USD ($) $ in Thousands			12 Months Ended
	Dec. 28, 2021	Dec. 01, 2021	Dec. 31, 2021	Dec. 31, 2020
Business Acquisition [Line Items]
Building				$ 292,900
Investment in financing receivables, net			$ 185,900
Financing lease right of use assets 1			8,900
Land				74,400
Land Improvements				11,600
Mortgage notes payable assumed, including fair value adjustments			(11,800)	(36,500)
Other assets acquired			800	1,800
Accounts payable, accrued liabilities and other liabilities assumed			(5,600)	(2,900)
Total cash paid			561,500	395,500
Sale leaseback transaction				426,100
Medical Office Building
Business Acquisition [Line Items]
Sale leaseback transaction			575,811	421,000
Medical Office Building | Columbus, OH
Business Acquisition [Line Items]
Sale leaseback transaction	$ 9,525	$ 16,275
Imputed lease arrangement		8,900	8,900
Financing lease receivable		$ 7,400	7,400
At-market lease intangibles
Business Acquisition [Line Items]
Intangibles			(58,800)	(53,400)
Above-market lease intangibles (lessor)
Business Acquisition [Line Items]
Intangibles			(3,400)	(2,000)
Below-market lease intangibles (lessor)
Business Acquisition [Line Items]
Intangibles			(1,400)
Intangible liabilities				(2,200)
Above-market lease intangibles (lessee)
Business Acquisition [Line Items]
Intangibles			(300)
Below-market lease intangibles (lessee)
Business Acquisition [Line Items]
Intangibles			$ (4,700)	$ (1,000)
Intangible asset useful life			45 years 4 months 24 days	55 years
Building
Business Acquisition [Line Items]
Building			$ 275,100
Land
Business Acquisition [Line Items]
Land			34,100
Land Improvements
Business Acquisition [Line Items]
Land Improvements			$ 8,900
Minimum | At-market lease intangibles
Business Acquisition [Line Items]
Intangible asset useful life			2 years 7 months 6 days	3 years 2 months 12 days
Minimum | Above-market lease intangibles (lessor)
Business Acquisition [Line Items]
Intangible asset useful life			1 year 10 months 24 days	1 year 8 months 12 days
Minimum | Below-market lease intangibles (lessor)
Business Acquisition [Line Items]
Intangible asset useful life			3 years 1 month 6 days	2 years 3 months 18 days
Minimum | Above-market lease intangibles (lessee)
Business Acquisition [Line Items]
Intangible asset useful life			36 years 8 months 12 days
Minimum | Building
Business Acquisition [Line Items]
Asset estimated useful life			18 years	19 years
Minimum | Investment in financing receivables, net
Business Acquisition [Line Items]
Asset estimated useful life			6 months
Minimum | Financing lease right-of-use assets
Business Acquisition [Line Items]
Asset estimated useful life			15 years
Minimum | Land Improvements
Business Acquisition [Line Items]
Asset estimated useful life			6 years	6 years
Maximum | At-market lease intangibles
Business Acquisition [Line Items]
Intangible asset useful life			16 years 7 months 6 days	12 years
Maximum | Above-market lease intangibles (lessor)
Business Acquisition [Line Items]
Intangible asset useful life			8 years 1 month 6 days	11 years
Maximum | Below-market lease intangibles (lessor)
Business Acquisition [Line Items]
Intangible asset useful life			21 years 9 months 18 days	9 years 10 months 24 days
Maximum | Above-market lease intangibles (lessee)
Business Acquisition [Line Items]
Intangible asset useful life			64 years 6 months
Maximum | Building
Business Acquisition [Line Items]
Asset estimated useful life			44 years	43 years
Maximum | Investment in financing receivables, net
Business Acquisition [Line Items]
Asset estimated useful life			34 years
Maximum | Financing lease right-of-use assets
Business Acquisition [Line Items]
Asset estimated useful life			34 years
Maximum | Land Improvements
Business Acquisition [Line Items]
Asset estimated useful life			16 years	14 years