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Organization (Details)
$ in Thousands
Dec. 31, 2019
USD ($)
state
property
Dec. 31, 2018
USD ($)
Real Estate [Line Items]    
Number of properties owned | property 424  
Number of states in which properties are located | state 39  
Total real estate properties, gross $ 7,461,586 $ 7,876,300
Real Estate Investment Property At Cost | Rents from significant lessee    
Real Estate [Line Items]    
Total real estate properties, gross $ 8,420,623 $ 8,428,644