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Summary of Significant Accounting Policies - Earnings per Share (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Earnings Per Share Basic And Diluted [Line Items] |  |  |  |
Net income attributable to Agree Realty Corporation | $ 36,663 | $ 21,280 | $ 89,123 | $ 67,766
Less: Series A preferred stock dividends | (289) | 0 | (289) | 0
Net Income Attributable to Common Stockholders | 36,374 | 21,280 | 88,834 | 67,766
Less: Income attributable to unvested restricted shares | (106) | (69) | (280) | (233)
Net income used in basic and diluted earnings per share | $ 36,268 | $ 21,211 | $ 88,554 | $ 67,533
Weighted average number of common shares outstanding | 69,304,906 | 53,902,541 | 65,826,126 | 50,818,154
Less: Unvested restricted stock | (202,406) | (180,585) | (202,406) | (180,585)
Weighted average number of common shares outstanding used in basic earnings per share | 69,102,500 | 53,721,956 | 65,623,720 | 50,637,569
Weighted average number of common shares outstanding used in basic earnings per share | 69,102,500 | 53,721,956 | 65,623,720 | 50,637,569
Effect of dilutive securities: |  |  |  |
Share-based compensation | 110,389 | 85,380 | 101,931 | 87,111
Weighted average number of common shares outstanding used in diluted earnings per share | 69,591,848 | 54,555,672 | 65,952,113 | 51,151,462
Restricted Stock [Member] |  |  |  |
Effect of dilutive securities: |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount | 9 | 3,139 | 200 | 2,355
Performance Units [Member] |  |  |  |
Effect of dilutive securities: |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount |  | 6,390 |  | 5,887
2019 ATM Forward Equity |  |  |  |
Effect of dilutive securities: |  |  |  |
Forward equity offering | 0 | 0 | 0 | 19,053
2019 ATM Forward Equity | Forward Sale Agreement [Member] |  |  |  |
Effect of dilutive securities: |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount |  |  |  | 22,820
April 2020 Forward Equity |  |  |  |
Effect of dilutive securities: |  |  |  |
Forward equity offering | 0 | 725,821 | 0 | 390,795
2020 ATM Forward Equity |  |  |  |
Effect of dilutive securities: |  |  |  |
Forward equity offering | 268,011 | 22,515 | 178,321 | 16,934
2020 ATM Forward Equity | Forward Sale Agreement [Member] |  |  |  |
Effect of dilutive securities: |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount | 0 | 4,510 | 0 | 34,899
2021 ATM Forward Equity |  |  |  |
Effect of dilutive securities: |  |  |  |
Forward equity offering | 110,948 | 0 | 48,141 | 0
2021 ATM Forward Equity | Forward Sale Agreement [Member] |  |  |  |
Effect of dilutive securities: |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount | 0 |  | 0 |

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