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Summary of Significant Accounting Policies - Narrative (Details) | 3 Months Ended | 6 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Jun. 30, 2020 USD ($) tenant shares | Jun. 30, 2020 USD ($) shares | Jun. 30, 2019 USD ($) | Dec. 31, 2019 USD ($) | Jan. 01, 2019 USD ($)
Accounting Policies [Line Items] |  |  |  |  |
Limited Partners' Capital Account, Units Outstanding | shares | 54,198,711 | 54,198,711 |  |  |
Amortization of above and below Market Leases |  | $ 7,588,000 | $ 6,501,000 |  |
Escrow Deposit | $ 7,043,000 | 7,043,000 |  | $ 26,554,000 |
Cash in Excess of FDIC Insured Amounts | 35,400,000 | 35,400,000 |  | 40,900,000 |
Straight-line rent receivables | $ 25,400,000 | $ 25,400,000 |  | 23,000,000.0 |
Lessor, Operating Lease, Assumptions and Judgments, Number Of Tenants, Collections No Longer Probable | tenant | 3 |  |  |  |
Number of Reportable Segments |  | 1 |  |  |
Right of use assets | $ 15,700,000 | $ 15,700,000 |  |  |
Lease liabilities | 16,009,000 | $ 16,009,000 |  |  |
Deferral Of Actual Rent, Percentage |  | 3 |  |  |
Percentage Of Rent Collection |  | 90 |  |  |
ASU 2016-02 | Restatement |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |
Right of use assets |  |  |  |  | $ 7,500,000
Lease liabilities |  |  |  |  | $ 7,500,000
Unbilled Revenues |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |
Accounts Receivable, Gross | $ 1,300,000 | $ 1,300,000 |  | $ 2,600,000 |
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 |  | 99.40% |  | 99.20% |
Agree Realty Corporation [Member] | Third party |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |
Non controlling interest |  | 0.60% |  | 0.80% |

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