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Equity - Narrative (Details)
 3 Months Ended 12 Months Ended
Mar. 31, 2019
USD ($)
vote
$ / shares
shares
Mar. 31, 2018
USD ($)
Dec. 31, 2018
$ / shares
shares
May 09, 2019
USD ($)
Class of Stock [Line Items]        
Common stock, shares authorized (up to) (in shares) 400,000,000   400,000,000  
Common stock, par value (in dollars per share) | $ / shares $ 0.01   $ 0.01  
Votes per common share | vote 1      
Value amount of shares authorized to be repurchased (up to) | $ $ 250,000,000      
Shares repurchased (in shares) 3,143,922      
Repurchased shares, average price per share (in dollars per share) | $ / shares $ 9.52      
Common stock repurchased | $ $ 29,998,000 $ 0    
Preferred stock, shares authorized (up to) (in shares) 10,000,000   10,000,000  
Preferred stock, par value (in dollars per share) | $ / shares $ 0.01   $ 0.01  
Preferred stock, shares outstanding (in shares) 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) 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      
Subsequent Event        
Class of Stock [Line Items]        
Remaining authorized repurchase amount | $       $ 187,800,000