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%