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Stockholders' Equity - Narrative (Details)
$ / shares in Units, $ in Millions
 3 Months Ended 12 Months Ended
Mar. 31, 2020
USD ($)
$ / shares
shares
Mar. 31, 2019
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        
Preferred stock, par value (in dollars 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   $ 25.00        
Common stock, par value (in dollars per share) | $ / shares $ 0.01   $ 0.01        
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) | $           $ 177.1 $ 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   6,000,000        
Preferred stock, shares issued (in shares) 3,156,087   3,156,087        
Preferred stock, cumulative redeemable dividend rate 7.75%   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        
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        
Number of elected directors pending preferred stock voting rights | director     2