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Summary of Significant Accounting Policies - Narrative (Details)
$ in Thousands
 1 Months Ended 3 Months Ended 12 Months Ended
Oct. 31, 2020
USD ($)
Dec. 31, 2020
USD ($)
tenant
property
shares
Sep. 30, 2020
Jun. 30, 2020
Dec. 31, 2020
USD ($)
tenant
property
segment
shares
Dec. 31, 2019
USD ($)
property
Jan. 01, 2019
USD ($)
Accounting Policies [Line Items]              
Outstanding units | shares   60,369,102     60,369,102    
Percentage of deferral rent     2 2      
Percentage of rent collected   99 98 95      
Number of real estate properties held-for-sale | property   1     1 1  
Cash in Excess of FDIC Insured Amounts   $ 7,000     $ 7,000 $ 40,900  
Straight-line rent receivables   $ 29,800     $ 29,800 23,000  
Number of tenants for whom, collections no longer probable | tenant   6     6    
Number of Reportable Segments | segment         1    
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List]   Other Assets     Other Assets    
Right of use assets   $ 44,500     $ 44,500    
Operating Lease, Liability, Statement of Financial Position [Extensible List]   Accounts Payable and Accrued Liabilities     Accounts Payable and Accrued Liabilities    
Operating Lease, Liability   $ 16,867     $ 16,867    
Operating Lease Liability, Before Depreciation   17,300     17,300    
ASU 2016-02 [Member] | Restatement              
Accounting Policies [Line Items]              
Right of use assets             $ 7,500
Operating Lease, Liability             $ 7,500
Unbilled Revenues [Member]              
Accounting Policies [Line Items]              
Accounts Receivable, Gross   $ 4,100     $ 4,100 $ 2,600  
General and Administrative Expense              
Accounting Policies [Line Items]              
One-time extension bonus $ 1,500            
Maximum [Member]              
Accounting Policies [Line Items]              
Percentage of deferral rent   1          
Building [Member]              
Accounting Policies [Line Items]              
Useful life         40 years    
Building Improvements [Member] | Minimum [Member]              
Accounting Policies [Line Items]              
Useful life         10 years    
Building Improvements [Member] | Maximum [Member]              
Accounting Policies [Line Items]              
Useful life         20 years    
Agree Realty Corporation [Member] | General Partner [Member]              
Accounting Policies [Line Items]              
Operating partnership owned percentage         99.40% 99.20%  
Agree Realty Corporation [Member] | Third party [Member]              
Accounting Policies [Line Items]              
Non controlling interest         0.60% 0.80%  
President And Chief Executive Officer [Member]              
Accounting Policies [Line Items]              
Agreement Auto Renewal Period 2 years            
Agreement Non Renewal, Notice Period 60 days