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Real Estate Investments (Details)
$ in Thousands, ft² in Millions
 12 Months Ended
Dec. 31, 2020
USD ($)
ft²
property
site
state
item
Dec. 31, 2019
USD ($)
ft²
property
item
site
state
Dec. 31, 2018
USD ($)
Real Estate Investments      
Number of Real Estate Properties | property 1,129 821  
Land Subject to Ground Leases | ft² 22.7 14.6  
Net Real Estate Investments $ 3,304,179 $ 2,218,592  
Retail Net Lease Assets Purchased | item 317 186  
Payments to Acquire Property, Plant, and Equipment $ 1,310,000 $ 702,900  
Number Of States Properties Located | state 39 40  
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life (in year) 11 years 3 months 18 days 11 years 8 months 12 days  
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Land $ 386,900 $ 195,800  
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Buildings 768,200 415,100  
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill $ 158,100 $ 92,000  
Number Of Development And Partner Capital Solutions Projects Completed | site 9 8  
Number of Development and Partner Capital Solutions Projects Construction | site 3    
Proceeds from Sale of Real Estate $ 47,700 $ 65,500 $ 65,800
Gains on Sales of Investment Real Estate 8,000 13,300 11,200
Provision for impairment 4,137 1,609 2,319
Impaired Real Estate Estate Fair Value $ 11,900 $ 3,000 $ 17,300