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Stockholders' Equity - Narrative (Details)
$ / shares in Units, $ in Thousands
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2020
USD ($)
$ / shares
shares
Jun. 30, 2019
USD ($)
shares
Jun. 30, 2020
USD ($)
$ / shares
shares
Jun. 30, 2019
USD ($)
shares
Dec. 31, 2019
director
quarter
$ / shares
shares
Nov. 27, 2019
USD ($)
Mar. 29, 2019
USD ($)
Sep. 10, 2018
USD ($)
Aug. 10, 2017
USD ($)
$ / shares
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) 20,872,888   20,872,888   20,872,888        
Preferred stock, shares outstanding (in shares) 20,872,888   20,872,888   20,872,888        
Redemption price (in dollars per share) | $ / shares $ 25.00   $ 25.00   $ 25.00        
Common stock, par value (in dollars per share) | $ / shares $ 0.01   $ 0.01   $ 0.01        
Net proceeds | $     $ 511,924 $ 321,655          
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 (in shares) 0 2,260,200 0 2,260,200          
Price per share (in usd per share) | $ / shares $ 6.12   $ 6.12            
Net proceeds | $ $ 13,600     $ 13,600          
Common stock reserved for issuance | $ $ 72,500   $ 72,500            
Equity agreement for preferred stock maximum aggregate sales price (up to) | $           $ 131,500      
Preferred Equity Distribution Agreement                  
Class of Stock [Line Items]                  
Shares Issued (in shares) 0 661,287 0 661,287          
Price per share (in usd per share) | $ / shares $ 24.72   $ 24.72            
Net proceeds | $   $ 16,100   $ 16,100          
Equity agreement for preferred stock maximum aggregate sales price (up to) | $             $ 50,000    
Preferred stock available for future issuance, value | $             $ 82,400    
Series B Preferred Stock                  
Class of Stock [Line Items]                  
Preferred stock, shares authorized (in shares) 6,000,000   6,000,000            
Preferred stock, shares issued (in shares) 3,156,087   3,156,087            
Preferred stock, cumulative redeemable dividend rate     7.75%            
Series C Preferred Stock                  
Class of Stock [Line Items]                  
Preferred stock, shares authorized (in shares) 6,600,000   6,600,000            
Preferred stock, shares issued (in shares) 4,181,807   4,181,807            
Preferred stock, cumulative redeemable dividend rate     7.875%   7.875%        
Series D Preferred Stock                  
Class of Stock [Line Items]                  
Preferred stock, shares authorized (in shares) 8,400,000   8,400,000            
Preferred stock, shares issued (in shares) 6,123,495   6,123,495            
Preferred stock, cumulative redeemable dividend rate     8.00%   8.00%        
Series E Preferred Stock                  
Class of Stock [Line Items]                  
Preferred stock, shares authorized (in shares) 9,900,000   9,900,000            
Preferred stock, shares issued (in shares) 7,411,499   7,411,499            
Preferred stock, cumulative redeemable dividend rate     7.875%   7.875%        
Preferred Stock                  
Class of Stock [Line Items]                  
Preferred stock, shares authorized (in shares) 30,900,000   30,900,000   30,900,000        
Preferred stock, shares issued (in shares) 20,872,888   20,872,888   20,872,888        
Preferred stock, shares outstanding (in shares) 20,872,888   20,872,888   20,872,888        
Number of quarters with no dividends that results in voting rights | quarter         6        
Number of elected directors pending preferred stock voting rights | director         2