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Stockholders' Equity - Narrative (Details)
 3 Months Ended 9 Months Ended 12 Months Ended
Apr. 22, 2015
USD ($)
$ / shares
shares
Jun. 04, 2013
USD ($)
$ / shares
shares
Sep. 30, 2017
USD ($)
director
quarter
$ / shares
shares
Sep. 30, 2016
shares
Sep. 30, 2017
USD ($)
director
quarter
$ / shares
shares
Sep. 30, 2016
shares
Dec. 31, 2016
$ / shares
shares
Aug. 10, 2017
USD ($)
$ / shares
Mar. 20, 2015
USD ($)
Class of Stock [Line Items]                  
Preferred stock, shares authorized (in shares)     200,000,000   200,000,000   200,000,000    
Preferred stock, par value (in dollars per share) | $ / shares     $ 0.01   $ 0.01   $ 0.01    
Preferred stock, shares issued (in shares)     6,600,000   6,600,000   6,600,000    
Preferred stock, shares outstanding (in shares)     6,600,000   6,600,000   6,600,000    
Proceeds from initial public offering | $     $ 0   $ 0        
Common stock, par value (in dollars per share) | $ / shares     $ 0.01   $ 0.01   $ 0.01    
Equity Distribution Agreements                  
Class of Stock [Line Items]                  
Shares issued (in shares)     0 0 87,737 0      
Common stock, par value (in dollars per share) | $ / shares               $ 0.01  
Common stock that may be sold (up to) | $               $ 100,000,000 $ 39,300,000
Share price (in dollars per share) | $ / shares     $ 6.68   $ 6.68        
Proceeds from issuance of common stock | $         $ 600,000        
Common stock reserved for issuance | $     $ 100,000,000   $ 100,000,000        
Series B Preferred Stock                  
Class of Stock [Line Items]                  
Preferred stock, shares authorized (in shares)     6,000,000   6,000,000   6,000,000    
Preferred stock, par value (in dollars per share) | $ / shares   $ 0.01 $ 0.01   $ 0.01   $ 0.01    
Preferred stock, shares issued (in shares)     3,000,000   3,000,000   3,000,000    
Preferred stock, shares outstanding (in shares)     3,000,000   3,000,000   3,000,000    
Shares issued (in shares)   3,000,000              
Preferred stock, cumulative redeemable dividend rate   7.75%     7.75%   7.75%    
Preferred stock, liquidation preference per share (in dollars per share) | $ / shares   $ 25 $ 25   $ 25   $ 25    
Preferred stock issuance, net | $   $ 72,400,000              
Redemption term         120 days        
Redemption price (in dollars per share) | $ / shares     $ 25.00   $ 25.00        
Series C Preferred Stock                  
Class of Stock [Line Items]                  
Preferred stock, shares authorized (in shares)     4,140,000   4,140,000   4,140,000    
Preferred stock, par value (in dollars per share) | $ / shares $ 0.01   $ 0.01   $ 0.01   $ 0.01    
Preferred stock, shares issued (in shares) 3,600,000   3,600,000   3,600,000   3,600,000    
Preferred stock, shares outstanding (in shares)     3,600,000   3,600,000   3,600,000    
Preferred stock, cumulative redeemable dividend rate 7.875%       7.875%   7.875%    
Preferred stock, liquidation preference per share (in dollars per share) | $ / shares $ 25   $ 25   $ 25   $ 25    
Preferred stock issuance, net | $ $ 86,900,000                
Series B and C Preferred Stock                  
Class of Stock [Line Items]                  
Number of quarters with no dividends that results in voting rights | quarter     6   6        
Number of elected directors pending preferred stock voting rights | director     2   2        
Stockholders required for term changes, percentage     66.67%   66.67%