Real Estate Investments (Details) $ in Thousands, ft² in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021 USD ($) ft² property item site state	Sep. 30, 2020 USD ($)	Sep. 30, 2021 USD ($) ft² property site state item	Sep. 30, 2020 USD ($)	Dec. 31, 2020 USD ($) ft²
Real Estate Investments
Number of Real Estate Properties	1,338		1,338		1,129
Land Subject to Ground Leases | ft²	27.7		27.7		22.7
Net Real Estate Investments	$ 4,114,047		$ 4,114,047		$ 3,304,179
Retail Net Lease Assets Purchased | item	80		219
Payments to Acquire Property, Plant, and Equipment	$ 340,600		$ 1,075,100
Number Of States Properties Located | state	28		40
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life (in year)	10 years 8 months 12 days		11 years 10 months 24 days
Payments to Acquire Land Held-for-use			$ 364,600
Payments for Capital Improvements			485,800
Payments to Acquire Intangible Assets			215,900
Payments to Acquire Other Productive Assets			$ 8,800
Number Of Development And Partner Capital Solutions Projects Completed | site	1		4
Number of Development and Partner Capital Solutions Projects Construction | site			3
Number of properties sold | property	3		13
Proceeds from Sale of Real Estate	$ 11,500		$ 46,800
Gains on Sales of Investment Real Estate	3,500		13,200
Provision for impairment	$ 0	$ 2,868	$ 0	$ 3,996