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Stockholders' Equity and Partners' Capital - Narrative (Details)		3 Months Ended
	May 05, 2022 $ / shares	Mar. 31, 2022 USD ($) $ / shares shares	Mar. 31, 2021 USD ($) $ / shares	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
Authorized amount stock repurchase plan				$ 300,000,000
Remaining amount of available for repurchase		300,000,000
Dividend distributions declared, but not paid		$ 75,766,000	$ 71,146,000
Dividends declared (in dollars per share) | $ / shares		$ 0.325	$ 0.320
Subsequent Event
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Dividends declared (in dollars per share) | $ / shares	$ 0.325
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		$ 7,900,000
Period for recognition (in years)		1 year 10 months 24 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		$ 2,000,000	$ 3,300,000
Amended and Restated 2006 Incentive Plan
Incentive Plan
Number of shares authorized (in shares) | shares		10,000,000
Number of shares available for grant (in shares) | shares		9,646,504
Healthcare Trust of America Holdings, LP (HTALP)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Dividend distribution ratio		1
Dividends declared (in dollars per share) | $ / shares		$ 0.325	$ 0.320

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