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Equity - Narrative (Details)
 3 Months Ended 6 Months Ended
Apr. 16, 2018
shares
Mar. 01, 2018
Jan. 10, 2017
shares
Jun. 30, 2018
$ / shares
shares
Jun. 30, 2017
$ / shares
Jun. 30, 2018
USD ($)
$ / shares
shares
Jun. 30, 2017
USD ($)
$ / shares
Mar. 08, 2018
USD ($)
Dec. 31, 2017
shares
Jan. 20, 2016
USD ($)
Class of Stock [Line Items]                    
Company-owned common units in the operating partnership (in shares)       155,647,733   155,647,733     155,602,508  
Company's ownership interest percentage       99.60%   99.60%     99.60%  
Non-controlling ownership interest percentage       0.40%   0.40%     0.40%  
Proceeds from issuance of common stock, net | $           $ (207,000) $ 647,509,000      
Stock repurchase program authorized | $               $ 250,000,000.0   $ 100,000,000
Common dividends declared (in dollars per share) | $ / shares       $ 0.25 $ 0.250 $ 0.5 $ 0.500      
Shares issued during period (in shares)     18,673,808              
At-the-Market                    
Class of Stock [Line Items]                    
Maximum shares authorized, value | $           $ 125,000,000        
Proceeds from issuance of common stock, net | $           $ 20,100,000        
VIE, Primary Beneficiary | HPP-MAC WSP, LLC                    
Class of Stock [Line Items]                    
Ownership Interest   75.00%       75.00%        
6.25% series A cumulative redeemable preferred units of the Operating Partnership                    
Class of Stock [Line Items]                    
Shares outstanding of preferred stock (in shares)                 407,066  
Shares redeemed during period 14,468                  
Liquidation preference of preferred stock (dollars per share) | $ / shares       25   $ 25        
Interest rate of preferred stock           6.25%        
Preferred dividends declared (dollars per share) | $ / shares       $ 0.3906            
Performance units                    
Class of Stock [Line Items]                    
Conversion ratio           1        
Common Stock/Units                    
Class of Stock [Line Items]                    
Non-controlling common units in the operating partnership (in shares)       569,045   569,045     569,045  
Partnership Interest                    
Class of Stock [Line Items]                    
Company-owned common units in the operating partnership (in shares)       155,647,733   155,647,733     155,602,508