Real Estate Investments (Details) $ in Thousands, ft² in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021 USD ($) ft² site state item property	Jun. 30, 2020 USD ($)	Jun. 30, 2021 USD ($) ft² site property state item	Jun. 30, 2020 USD ($)	Dec. 31, 2020 USD ($) ft²
Real Estate Investments
Number of Real Estate Properties	1,262		1,262		1,129
Land Subject to Ground Leases | ft²	26.1		26.1		22.7
Net Real Estate Investments	$ 3,853,994		$ 3,853,994		$ 3,304,179
Retail Net Lease Assets Purchased | item	54		140
Payments to Acquire Property, Plant, and Equipment	$ 347,000		$ 734,900
Number Of States Properties Located | state	25		35
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life (in year)	11 years 9 months 18 days		12 years 4 months 24 days
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Land	$ 249,300		$ 249,300
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Buildings	323,500		323,500
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill	153,300		153,300
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Other Noncurrent Assets	$ 8,800		$ 8,800
Number Of Development And Partner Capital Solutions Projects Completed | site	3		4
Number of Development and Partner Capital Solutions Projects Construction | site			2
Number of properties sold | property	7		10
Proceeds from Sale of Real Estate	$ 27,000		$ 35,400
Gains on Sales of Investment Real Estate	6,800		9,700
Provision for impairment	$ 0	$ 1,128	$ 0	$ 1,128