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Equity - Narrative (Details)
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2019
USD ($)
$ / shares
shares
Jun. 30, 2019
shares
Mar. 31, 2019
shares
Sep. 30, 2019
USD ($)
vote
$ / shares
shares
Sep. 30, 2018
USD ($)
Dec. 31, 2018
$ / shares
shares
Nov. 08, 2019
USD ($)
Class of Stock [Line Items]              
Common stock, shares authorized (up to) (in shares) 400,000,000     400,000,000   400,000,000  
Common stock, par value (in dollars per share) | $ / shares $ 0.01     $ 0.01   $ 0.01  
Votes per common share | vote       1      
Value amount of shares authorized to be repurchased (up to) | $ $ 250,000,000.0     $ 250,000,000.0      
Shares repurchased (in shares) 280,436     4,428,947      
Repurchased shares, average price per share (in dollars per share) | $ / shares $ 9.96     $ 9.65      
Common stock repurchased | $ $ 2,800,000     $ 42,828,000 $ 0    
Preferred stock, shares authorized (up to) (in shares) 10,000,000     10,000,000   10,000,000  
Preferred stock, par value (in dollars per share) | $ / shares $ 0.01     $ 0.01   $ 0.01  
Preferred stock, shares outstanding (in shares) 0     0   0  
Limited partnership, price per unit (in dollars per unit) | $ / shares           $ 11.76  
Option to redeem for common stock ratio           1  
Common Stock              
Class of Stock [Line Items]              
Aggregate offering price (up to) | $       $ 200,000,000      
Shares repurchased (in shares) 280,436 1,004,589 3,143,922        
Unaffiliated Third Parties              
Class of Stock [Line Items]              
Common units issued (in shares)           796,684  
Operating partnerships units held (in shares) 796,684     796,684      
Subsequent Event              
Class of Stock [Line Items]              
Remaining authorized repurchase amount | $             $ 175,200,000