Summary of Significant Accounting Principles (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022 USD ($) instrument agreement	Sep. 30, 2021 USD ($)	Sep. 30, 2022 USD ($) item segment instrument agreement	Sep. 30, 2021 USD ($)	Dec. 31, 2021 USD ($)
Basis of Accounting and Principles of Consolidation
Assets owned	$ 10,505,981		$ 10,505,981		$ 9,773,082
Liabilities owed	5,161,570		$ 5,161,570		4,628,953
Segment Reporting
Number of reportable segments | segment			1
Investment portfolio
Number of transaction types | item			3
Revenue Recognition
Accrued straight-line rental revenue, net of allowance	$ 45,200		$ 45,200		39,400
Leases indexed to increases in the CPI, minimum adjustment period			1 year
Leases indexed to increases in the CPI, minimum multiplier increasing rent (in multipliers)			1
Leases indexed to increases in the CPI, maximum multiplier increasing rent (in multipliers)			1.25
Portion of investment portfolio subject to contingent rent based upon tenant sales (as a percent)	3.30%		3.30%
Contingent rent as a percentage of rental revenue, historical	2.00%		2.00%
Impairments
Provisions for impairment	$ 6,800	$ 3,400	$ 13,300	$ 15,400
Estimate fair value of impaired real estate assets			59,000
Write-offs charged against allowance			3,700
Loans Receivable
Non accrual status loan receivables	21,900		$ 21,900		28,800
Number of classes in portfolio of loans and financing receivables | item			2
Restricted cash
Restricted cash included in other assets	$ 3,111	5,825	$ 3,111	5,825	$ 5,800
Restricted Cash and Cash Equivalents, Statement of Financial Position [Extensible Enumeration]	Other assets, net		Other assets, net		Other assets, net
Derivative Instruments and Hedging Activities
Carrying amount	$ 4,664,996		$ 4,664,996
Provision For Impairment
Loans Receivable
Provision for loan losses			(300)	2,000
Payment deferral due to COVID-19
Revenue Recognition
Revenue associated with deferral arrangements	1,000	800	2,000	5,800
Receivables collections	$ 4,600	$ 8,000	$ 11,800	$ 19,200
Loans receivable
Loans Receivable
Maximum past due period for loans payments causing nonaccrual status			60 days
Interest rate swaps
Derivative Instruments and Hedging Activities
Number of agreements | instrument	7		7
Interest rate swap, due in 2029
Derivative Instruments and Hedging Activities
Number of agreements | instrument	1		1
Interest rate swap, due in 2029 | Designated as hedging instrument
Derivative Instruments and Hedging Activities
Current notional amounts	$ 200,000		$ 200,000
Carrying amount	$ 200,000		$ 200,000
Interest rate swap, due in 2027 | Designated as hedging instrument
Derivative Instruments and Hedging Activities
Number of agreements | agreement	6		6
Current notional amounts	$ 400,000		$ 400,000
Carrying amount	400,000		$ 400,000
Buildings | Maximum
Accounting for Real Estate Investments
Estimated useful life			40 years
Buildings | Minimum
Accounting for Real Estate Investments
Estimated useful life			30 years
Land improvements
Accounting for Real Estate Investments
Estimated useful life			15 years
Consolidated special purpose entities
Basis of Accounting and Principles of Consolidation
Assets owned	9,200,000		$ 9,200,000		$ 8,500,000
Liabilities owed	$ 2,400,000		$ 2,400,000		$ 2,600,000