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Summary of Significant Accounting Policies - Earnings per Share (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Earnings Per Share Basic And Diluted [Line Items]
Net income attributable to Agree Realty Corporation	$ 21,280	$ 20,611	$ 67,766	$ 57,522
Less: Income attributable to unvested restricted shares	(69)	(98)	(233)	(283)
Net income used in basic and diluted earnings per share	$ 21,211	$ 20,513	$ 67,533	$ 57,239
Weighted average number of common shares outstanding	53,902,541	42,034,685	50,818,154	40,194,931
Less: Unvested restricted stock	(180,585)	(202,228)	(180,585)	(202,228)
Weighted average number of common shares outstanding used in basic earnings per share	53,721,956	41,832,457	50,637,569	39,992,703
Weighted average number of common shares outstanding used in basic earnings per share	53,721,956	41,832,457	50,637,569	39,992,703
Effect of dilutive securities: share-based compensation	85,380	109,027	87,111	102,845
Weighted average number of common shares outstanding used in diluted earnings per share	54,555,672	42,318,042	51,151,462	40,625,441
Restricted Stock [Member]
Earnings Per Share Basic And Diluted [Line Items]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	3,139		2,355
Performance Units [Member]
Earnings Per Share Basic And Diluted [Line Items]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	6,390		5,887
September 2018 Forward Sales
Earnings Per Share Basic And Diluted [Line Items]
Effect of dilutive securities: forward equity offering				359,713
April 2019 Forward Equity
Earnings Per Share Basic And Diluted [Line Items]
Effect of dilutive securities: forward equity offering		376,558		170,180
April 2020 Forward Equity
Earnings Per Share Basic And Diluted [Line Items]
Effect of dilutive securities: forward equity offering	725,821	0	390,795	0
2019 ATM Forward Equity
Earnings Per Share Basic And Diluted [Line Items]
Effect of dilutive securities: forward equity offering			19,053
2019 ATM Forward Equity | Forward Sale Agreement [Member]
Earnings Per Share Basic And Diluted [Line Items]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount			22,820
2020 ATM Forward Equity
Earnings Per Share Basic And Diluted [Line Items]
Effect of dilutive securities: forward equity offering	22,515		16,934
2020 ATM Forward Equity | Forward Sale Agreement [Member]
Earnings Per Share Basic And Diluted [Line Items]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	4,510		34,899

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