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Stockholders' Equity and Partners' Capital - Narrative (Details)
$ / shares in Units, $ in Millions
3 Months Ended
Apr. 25, 2019
$ / shares
Mar. 31, 2019
USD ($)
$ / shares
shares
Mar. 31, 2018
USD ($)
$ / shares
Dec. 31, 2018
USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Shares repurchased during period | shares   345,786    
Shares repurchased during period (in dollars per share) | $ / shares   $ 24.65    
Stock repurchased during period, value   $ 8.5    
Remaining amount of common stock available for repurchase   $ 224.3    
Common Stock Dividends        
Dividends declared (in dollars per share) | $ / shares   $ 0.310 $ 0.305  
Restricted Common Stock        
Incentive Plan        
Nonvested awards, total compensation cost not yet recognized   $ 10.3    
Period for recognition (in years)   1 year 9 months 18 days    
Restricted Common Stock | General and Administrative Expense        
Incentive Plan        
Compensation expense   $ 3.4 $ 3.5  
Subsequent Event        
Common Stock Dividends        
Dividends declared (in dollars per share) | $ / shares $ 0.310      
ATM Offering Program [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Shares remaining available for issuance under the new ATM   $ 500.0   $ 500.0
2006 Incentive Plan        
Incentive Plan        
Number of shares authorized (in shares) | shares   5,000,000    
Number of shares available for grant (in shares) | shares   1,092,509    
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        
Dividends declared (in dollars per share) | $ / shares   $ 0.310 $ 0.305