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Real Estate Investments (Details)
 3 Months Ended 6 Months Ended
Jun. 30, 2019
USD ($)
ft²
site
Jun. 30, 2018
USD ($)
Jun. 30, 2019
USD ($)
ft²
property
site
Jun. 30, 2018
USD ($)
Dec. 31, 2018
USD ($)
ft²
Real Estate Properties [Line Items]          
Number of Real Estate Properties 722   722   645
Land Subject to Ground Leases | ft² 13,100,000   13,100,000   11,200,000
Net Real Estate Investments $ 1,918,718,000   $ 1,918,718,000   $ 1,661,334,000
Number of Development and Partner Capital Solutions Projects Construction | site 6   9    
Number of properties sold 4   6    
Proceeds from Sale of Real Estate $ 17,000,000.0   $ 26,800,000    
Gains (Losses) on Sales of Investment Real Estate 2,900,000   6,400,000    
Impairment of Long-Lived Assets Held-for-use 1,193,000 $ 1,163,000 1,609,000 $ 1,163,000  
Business Acquisition 2019 [Member]          
Real Estate Properties [Line Items]          
Payments to Acquire Property, Plant, and Equipment $ 176,900,000   $ 318,600,000    
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life (in year) 10 years 7 months 6 days   11 years 7 months 6 days    
Retail Net Lease Assets Purchased 31   79    
Number Of States Properties Located 20   30    
Number of Contracts or Customers Comprising Ten Percent or More Of Company's Total Assets or Total Rent     0    
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Land $ 89,900,000   $ 89,900,000    
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Buildings 189,600,000   189,600,000    
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill 39,100,000   39,100,000    
Contingent consideration $ 0   $ 0