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Stockholders' Equity - Narrative (Details)
$ / shares in Units, $ in Millions
 3 Months Ended
Mar. 31, 2021
USD ($)
quarter
$ / shares
shares
Dec. 31, 2020
$ / shares
shares
Sep. 30, 2020
$ / shares
Jun. 30, 2020
$ / shares
Mar. 31, 2020
$ / 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              
Preferred stock, par value (in usd per share) | $ / shares $ 0.01 $ 0.01              
Preferred stock, shares issued (in shares) 20,872,888 20,872,888              
Preferred stock, shares outstanding (in shares) 20,872,888 20,872,888              
Redemption price (in dollars per share) | $ / shares $ 25.00                
Preferred stock redemption period 120 days                
Number of elected directors pending preferred stock voting rights | quarter 2                
Cash dividend per share (in dollars per share) | $ / shares $ 0.100 $ 0.100 $ 0.075 $ 0.050 $ 0        
Common stock, par value (in usd per share) | $ / shares $ 0.01 $ 0.01              
Equity Distribution Agreements                  
Class of Stock [Line Items]                  
Common stock, par value (in usd per share) | $ / shares                 $ 0.01
Common stock that may be sold (up to) | $               $ 177.1 $ 100.0
Shares Issued (in shares) 0       0        
Common stock reserved for issuance | $ $ 72.5                
Equity agreement for preferred stock maximum aggregate sales price (up to) | $           $ 131.5      
Preferred Equity Distribution Agreement                  
Class of Stock [Line Items]                  
Shares Issued (in shares) 0       0        
Equity agreement for preferred stock maximum aggregate sales price (up to) | $             $ 50.0    
Preferred stock available for future issuance, value | $ $ 82.4                
Series B Preferred Stock                  
Class of Stock [Line Items]                  
Preferred stock, shares authorized (in shares) 6,000,000                
Preferred stock, shares issued (in shares) 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                
Preferred stock, shares issued (in shares) 4,181,807                
Preferred stock, cumulative redeemable dividend rate 7.875%                
Series D Preferred Stock                  
Class of Stock [Line Items]                  
Preferred stock, shares authorized (in shares) 8,400,000                
Preferred stock, shares issued (in shares) 6,123,495                
Preferred stock, cumulative redeemable dividend rate 8.00%                
Series E Preferred Stock                  
Class of Stock [Line Items]                  
Preferred stock, shares authorized (in shares) 9,900,000                
Preferred stock, shares issued (in shares) 7,411,499                
Preferred stock, cumulative redeemable dividend rate 7.875%                
Preferred Stock                  
Class of Stock [Line Items]                  
Preferred stock, shares authorized (in shares) 30,900,000 30,900,000              
Preferred stock, shares issued (in shares) 20,872,888 20,872,888              
Preferred stock, shares outstanding (in shares) 20,872,888 20,872,888              
Number of quarters with no dividends that results in voting rights | quarter 6