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Mortgage Notes Payable, Net (Narrative) (Details)
ft² in Millions
May 30, 2019
USD ($)
property
test
Dec. 31, 2019
USD ($)
ft²
property
Dec. 18, 2019
USD ($)
ft²
property
Sep. 30, 2019
property
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Dec. 08, 2017
ft²
property
state
Debt Instrument [Line Items]              
Area of real estate property | ft²   18.5          
Restricted cash | $   $ 17,942,000     $ 18,180,000 $ 19,588,000  
192 Properties              
Debt Instrument [Line Items]              
Encumbered properties | property 192            
Repayments of debt | $ $ 204,900,000            
39 Properties              
Debt Instrument [Line Items]              
Encumbered properties | property 39            
Debt Covenant Test One              
Debt Instrument [Line Items]              
Debt service coverage ratio floor 130.00%            
Debt Covenant Test Two              
Debt Instrument [Line Items]              
Debt service coverage ratio floor 120.00%            
Amended Credit Facility              
Debt Instrument [Line Items]              
Collateral pledged | $   1,200,000,000          
Repayments of debt | $ $ 175,000,000.0            
Mortgages              
Debt Instrument [Line Items]              
Collateral pledged | $   $ 2,500,000,000     $ 2,300,000,000    
Encumbered properties | property   617          
Mortgages | 39 Properties              
Debt Instrument [Line Items]              
Repayments of debt | $ 29,900,000            
Mortgages | Net Lease Mortgage Note              
Debt Instrument [Line Items]              
Mortgage loan | $ $ 242,000,000.0            
Amortization rate 0.50%            
Encumbered properties | property 201 201          
Proceeds from issuance of debt | $ $ 37,100,000            
Number of additional real estate properties | property       10      
Maximum value of properties released or exchanged from collateral pool 35.00%            
Maximum prepayment of initial principal balance 35.00%            
Minimum net proceeds from public equity offering | $ $ 75,000,000.0            
Number of debt service coverage ratio tests | test 2            
Mortgages | Net Lease Mortgage Note | 153 Properties              
Debt Instrument [Line Items]              
Encumbered properties | property       153      
Mortgages | Stop And Shop Loan [Member]              
Debt Instrument [Line Items]              
Mortgage loan | $     $ 45,000,000.0        
Stated interest rate     3.445%        
Area of real estate property | ft²     0.3        
Encumbered properties | property     4        
Mortgages | Mortgage Loan I [2]              
Debt Instrument [Line Items]              
Encumbered properties | property   244          
Mortgages | Mortgage Loan II              
Debt Instrument [Line Items]              
Encumbered properties | property   12         12
Number of states | state             8
Rentable area | ft²             2.4
Mortgages | Class A-1 Net Lease Mortgage Notes              
Debt Instrument [Line Items]              
Mortgage loan | $ $ 121,000,000.0            
Stated interest rate 3.78%            
Encumbered properties | property   95          
Mortgages | Class A-2 Net Lease Mortgage Notes              
Debt Instrument [Line Items]              
Mortgage loan | $ $ 121,000,000.0            
Stated interest rate 4.46%            
Encumbered properties | property   106          
MASSACHUSETTS | Mortgages | Stop And Shop Loan [Member]              
Debt Instrument [Line Items]              
Encumbered properties | property     3