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Real Estate Portfolio (Details)
ft² in Millions
 12 Months Ended
Dec. 31, 2019
USD ($)
ft²
property
site
Dec. 31, 2018
USD ($)
ft²
site
property
Dec. 31, 2017
USD ($)
Real Estate Portfolio      
Number of Real Estate Properties | property 821 645  
Land Subject to Ground Leases | ft² 14.6 11.2  
Net Real Estate Investments $ 2,218,592,000 $ 1,661,334,000  
Payments to Acquire Property, Plant, and Equipment $ 702,900,000 $ 608,300,000  
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life (in year) 11 years 8 months 12 days 12 years 4 months 24 days  
Deferred Revenue $ 4,100,000 $ 3,700,000  
Retail Net Lease Assets Purchased 186 225  
Number of Development and Partner Capital Solutions Projects Construction | site 8 8  
Number Of States Properties Located 40 37  
Number of Contracts or Customers Comprising Ten Percent or More Of Company's Total Assets or Total Rent 0 0  
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Land $ 195,800,000 $ 164,700,000  
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Buildings 415,100,000 325,000,000.0  
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill 92,000,000.0 118,600,000  
Contingent consideration 0 0  
Proceeds from Sale of Real Estate 65,500,000 65,800,000 $ 44,300,000
Gains (Losses) on Sales of Investment Real Estate 13,300,000 11,200,000 14,200,000
Provision for impairment 1,609,000 2,319,000 $ 0.0
Impaired Real Estate Estate Fair Value $ 3,000,000.0 $ 17,300,000