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Stockholders' Equity and Partners' Capital - Narrative (Details) |  |  | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | --- | ---
Jul. 06, 2022 $ / shares | Jul. 01, 2022 $ / shares | Jun. 30, 2022 USD ($) $ / shares shares | Mar. 31, 2022 $ / shares | Jun. 30, 2021 USD ($) $ / shares | Mar. 31, 2021 USD ($) $ / shares | Jun. 30, 2022 USD ($) shares | Jun. 30, 2021 USD ($) | Sep. 30, 2020 USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Amount remaining available for issuance under the new ATM |  |  | $ 750,000,000 |  |  |  | $ 750,000,000 |  |
Authorized amount stock repurchase plan |  |  |  |  |  |  |  |  | $ 300,000,000
Remaining amount of available for repurchase |  |  | 300,000,000 |  |  |  | 300,000,000 |  |
Dividend distributions declared, but not paid |  |  | $ 75,765,000 |  | $ 71,302,000 |  | 75,765,000 | $ 71,302,000 |
Common stock dividends declared (in dollars per share) | $ / shares |  |  | $ 0.325 | $ 0.325 | $ 0.320 | $ 0.320 |  |  |
Distributions paid (in dollars per share) | $ / shares | $ 4.82 |  |  |  |  |  |  |  |
Operating Partnership distributions paid (in dollars per share) | $ / shares | $ 4.82 |  |  |  |  |  |  |  |
Subsequent Event |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Common stock dividends declared (in dollars per share) | $ / shares |  | $ 0.029 |  |  |  |  |  |  |
Operating Partnership distributions paid (in dollars per share) | $ / shares |  | $ 0.029 |  |  |  |  |  |  |
Common Stock |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Amount remaining available for issuance under the new ATM |  |  |  |  |  | $ 750,000,000 |  |  |
Restricted Common Stock |  |  |  |  |  |  |  |  |
Incentive Plan |  |  |  |  |  |  |  |  |
Nonvested awards, total compensation cost not yet recognized |  |  | $ 6,200,000 |  |  |  | $ 6,200,000 |  |
Period for recognition (in years) |  |  |  |  |  |  | 1 year 7 months 6 days |  |
Restricted Common Stock | Minimum |  |  |  |  |  |  |  |  |
Incentive Plan |  |  |  |  |  |  |  |  |
Award vesting period |  |  |  |  |  |  | 3 years |  |
Restricted Common Stock | Maximum |  |  |  |  |  |  |  |  |
Incentive Plan |  |  |  |  |  |  |  |  |
Award vesting period |  |  |  |  |  |  | 4 years |  |
Restricted Common Stock | General and Administrative Expense |  |  |  |  |  |  |  |  |
Incentive Plan |  |  |  |  |  |  |  |  |
Compensation expense |  |  | $ 2,200,000 |  | $ 2,100,000 |  | $ 4,200,000 | $ 5,400,000 |
Amended and Restated 2006 Incentive Plan |  |  |  |  |  |  |  |  |
Incentive Plan |  |  |  |  |  |  |  |  |
Number of shares authorized (in shares) | shares |  |  | 10,000,000 |  |  |  | 10,000,000 |  |
Number of shares available for grant (in shares) | shares |  |  | 9,647,839 |  |  |  | 9,647,839 |  |
Healthcare Trust of America Holdings, LP (HTALP) |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Dividend distribution ratio |  |  |  |  |  |  | 1 |  |
Common stock dividends declared (in dollars per share) | $ / shares |  |  | $ 0.325 | $ 0.325 | $ 0.320 | $ 0.320 |  |  |

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