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Stockholders' Equity - Narrative (Details)
$ / shares in Units, $ in Thousands
 3 Months Ended 9 Months Ended 12 Months Ended 18 Months Ended
Sep. 30, 2019
USD ($)
director
quarter
$ / shares
shares
Sep. 30, 2018
USD ($)
$ / shares
shares
Sep. 30, 2019
USD ($)
director
quarter
$ / shares
shares
Sep. 30, 2018
USD ($)
$ / shares
shares
Dec. 31, 2018
$ / shares
shares
Mar. 31, 2019
Mar. 29, 2019
USD ($)
Mar. 28, 2019
shares
Sep. 10, 2018
USD ($)
Oct. 13, 2017
$ / shares
Aug. 10, 2017
USD ($)
$ / shares
Class of Stock [Line Items]                      
Preferred stock, shares authorized (in shares) | 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) | shares 13,250,707   13,250,707   13,250,707            
Preferred stock, shares outstanding (in shares) | shares 12,000,000   12,000,000   12,000,000            
Preferred stock, liquidation preference per share (in dollars per share) | $ / shares $ 25.00   $ 25.00                
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%                
Redemption term     120 days                
Redemption price (in dollars per share) | $ / shares $ 25.00   $ 25.00                
Common stock, par value (in dollars per share) | $ / shares $ 0.01   $ 0.01   $ 0.01            
Proceeds from issuance of preferred stock | $     $ 30,490 $ 0              
Equity Distribution Agreements                      
Class of Stock [Line Items]                      
Common stock, par value (in dollars per share) | $ / shares                     $ 0.01
Common stock that may be sold (up to) | $                 $ 177,100   $ 100,000
Shares issued during period (in shares) | shares 0 2,433,487 2,260,200 14,588,631              
Sale of stock, price per share (in dollars per share) | $ / shares $ 6.12   $ 6.12                
Proceeds from issuance of common stock | $   $ 15,200 $ 13,600 $ 89,000              
Common stock reserved for issuance | $ $ 72,500   $ 72,500                
Preferred Equity Distribution Agreement                      
Class of Stock [Line Items]                      
Shares issued during period (in shares) | shares 589,420   1,250,707                
Equity agreement for preferred stock maximum aggregate sales price (up to) | $             $ 50,000        
Proceeds from issuance of preferred stock | $ $ 14,400   $ 30,500                
Preferred stock available for future issuance, value | $             $ 19,000        
Series B Preferred Stock                      
Class of Stock [Line Items]                      
Preferred stock, shares authorized (in shares) | 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            
Preferred stock, shares issued (in shares) | shares 3,138,019   3,138,019   3,000,000            
Preferred stock, shares outstanding (in shares) | shares 3,138,019   3,138,019   3,000,000            
Preferred stock, cumulative redeemable dividend rate     7.75%   7.75%            
Preferred stock, liquidation preference per share (in dollars per share) | $ / shares $ 25   $ 25   $ 25            
Series C Preferred Stock                      
Class of Stock [Line Items]                      
Preferred stock, shares authorized (in shares) | shares 6,600,000   6,600,000   4,140,000            
Preferred stock, par value (in dollars per share) | $ / shares $ 0.01   $ 0.01   $ 0.01            
Preferred stock, shares issued (in shares) | shares 4,144,161   4,144,161   3,600,000            
Preferred stock, shares outstanding (in shares) | shares 4,144,161   4,144,161   3,600,000            
Preferred stock, cumulative redeemable dividend rate     7.875%   7.875%            
Preferred stock, shares authorized but unissued | shares               2,460,000      
Preferred stock, liquidation preference per share (in dollars per share) | $ / shares $ 25   $ 25   $ 25            
Series D Preferred Stock                      
Class of Stock [Line Items]                      
Preferred stock, shares authorized (in shares) | shares 8,400,000   8,400,000   5,750,000            
Preferred stock, par value (in dollars per share) | $ / shares $ 0.01   $ 0.01   $ 0.01            
Preferred stock, shares issued (in shares) | shares 5,968,527   5,968,527   5,400,000            
Preferred stock, shares outstanding (in shares) | shares 5,968,527   5,968,527   5,400,000            
Preferred stock, cumulative redeemable dividend rate     8.00%   8.00% 8.00%          
Preferred stock, shares authorized but unissued | shares               2,650,000      
Preferred stock, liquidation preference per share (in dollars per share) | $ / shares $ 25   $ 25   $ 25         $ 25  
LIBOR | Series D Preferred Stock                      
Class of Stock [Line Items]                      
Preferred stock, cumulative redeemable dividend rate           5.695%          
Maximum | Equity Distribution Agreements                      
Class of Stock [Line Items]                      
Sale of stock, price per share (in dollars per share) | $ / shares   $ 6.31   $ 6.31              
Maximum | Preferred Equity Distribution Agreement                      
Class of Stock [Line Items]                      
Sale of stock, price per share (in dollars per share) | $ / shares 24.78   24.78                
Minimum | Equity Distribution Agreements                      
Class of Stock [Line Items]                      
Sale of stock, price per share (in dollars per share) | $ / shares   $ 6.19   $ 6.19              
Minimum | Preferred Equity Distribution Agreement                      
Class of Stock [Line Items]                      
Sale of stock, price per share (in dollars per share) | $ / shares $ 24.75   $ 24.75