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Summary of Significant Accounting Policies - Narrative (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2019
USD ($)
segment
property
shares
Dec. 31, 2018
USD ($)
property
Dec. 31, 2017
USD ($)
Jan. 01, 2019
USD ($)
Accounting Policies [Line Items]        
Limited Partners' Capital Account, Units Outstanding | shares 45,921,242      
Amortization of above and below Market Leases $ 13,501 $ 10,668 $ 5,091  
Number Of Real Estate Properties Held-For-Sale | property 1 0    
Escrow Deposit $ 26,554 $ 20    
Cash in Excess of FDIC Insured Amounts 40,900 52,700    
Straight-line rent receivables $ 23,000 16,700    
Number of Reportable Segments | segment 1      
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List] us-gaap:OtherAssetsMember      
Right of use assets $ 16,000      
Operating Lease, Liability, Statement of Financial Position [Extensible List] us-gaap:AccountsPayableMember      
Lease liabilities $ 16,211      
Dividend Declared [Member]        
Accounting Policies [Line Items]        
Escrow Deposit 24,800      
ASU 2016-02 | Restatement        
Accounting Policies [Line Items]        
Right of use assets       $ 7,500
Lease liabilities       $ 7,500
Unbilled Revenues        
Accounting Policies [Line Items]        
Accounts Receivable, Gross $ 2,600 $ 3,300    
Building [Member]        
Accounting Policies [Line Items]        
Property, Plant and Equipment, Useful Life 40 years      
Building Improvements [Member] | Minimum [Member]        
Accounting Policies [Line Items]        
Property, Plant and Equipment, Useful Life 10 years      
Building Improvements [Member] | Maximum [Member]        
Accounting Policies [Line Items]        
Property, Plant and Equipment, Useful Life 20 years      
Agree Realty Corporation [Member] | General Partner        
Accounting Policies [Line Items]        
Percentage of Operating Partnership Owned 99.20% 99.10%    
Agree Realty Corporation [Member] | Third party        
Accounting Policies [Line Items]        
Non controlling interest 0.80%