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Real Estate Investments (Details)
 3 Months Ended 9 Months Ended
Sep. 30, 2020
USD ($)
ft²
property
item
state
Sep. 30, 2019
USD ($)
Sep. 30, 2020
USD ($)
ft²
item
property
state
Sep. 30, 2019
USD ($)
Dec. 31, 2019
USD ($)
ft²
state
Real Estate Investments          
Number of Real Estate Properties 1,027   1,027   821
Number of states | state 45   45   46
Land Subject to Ground Leases | ft² 21,000,000.0   21,000,000.0   14,600,000
Net Real Estate Investments $ 3,015,606,000   $ 3,015,606,000   $ 2,218,592,000
Retail Net Lease Assets Purchased 91   217    
Payments to Acquire Property, Plant, and Equipment $ 458,800,000   $ 958,300,000    
Number Of States Properties Located 26   35    
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life (in year) 11 years 6 months   11 years 2 months 12 days    
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Land $ 248,200,000   $ 248,200,000    
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Buildings 588,600,000   588,600,000    
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill 97,000,000.0   97,000,000.0    
Aggregate acquisitions of right use of asset $ 24,500,000   $ 24,500,000    
Number of Contracts or Customers Comprising Ten Percent or More Of Company's Total Assets or Total Rent     0    
Number Of Development And Partner Capital Solutions Projects Completed | item 2   6    
Number of Development and Partner Capital Solutions Projects Construction | item     4    
Number of properties sold | property 2   16    
Proceeds from Sale of Real Estate $ 3,400,000   $ 46,000,000.0    
Gains (Losses) on Sales of Investment Real Estate 1,000,000.0   7,600,000    
Provision for impairment 2,868,000 $ 0 3,996,000 $ 1,609,000  
Impaired Real Estate Estate Fair Value $ 4,500,000   $ 4,500,000