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Consolidated Statements of Equity (Parenthetical) - shares | 3 Months Ended | 9 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018 | Jun. 30, 2019 | Dec. 31, 2018 | Jun. 30, 2018 | Dec. 31, 2017
Balance (in units/ shares) | 112,059,175 | 108,848,223 | 112,059,175 | 108,848,223 | 111,949,887 | 110,241,868 | 103,260,495 | 101,292,299
Conversion of common units to common shares (in units/shares) | 97,539 | 1,841,810 | 103,039 | 1,895,627 |  |  |  |
Share-based compensation issuance, net of redemptions (in units/shares) | 11,749 | 4,254 | 100,181 | 141,633 |  |  |  |
Forward Equity Sale Agreement |  |  |  |  |  |  |  |
Common shares issued during the period (in units/shares) |  | 2,750,000 | 1,614,087 | 4,527,000 |  |  |  |
Common Stock At-the-Market Program |  |  |  |  |  |  |  |
Common shares issued during the period (in units/shares) |  | 991,664 |  | 991,664 |  |  |  |

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