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Stockholders’ Equity - Narrative (Details)
$ / shares in Units, $ in Thousands
 1 Months Ended 12 Months Ended
Oct. 31, 2019
USD ($)
$ / shares
shares
Dec. 31, 2020
USD ($)
director
quarter
$ / shares
shares
Dec. 31, 2019
USD ($)
$ / shares
shares
Dec. 31, 2018
USD ($)
$ / shares
shares
Nov. 27, 2019
USD ($)
shares
Mar. 29, 2019
USD ($)
Mar. 28, 2019
shares
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 outstanding (in shares)   20,872,888 20,872,888            
Preferred stock, shares issued (in shares)   20,872,888 20,872,888            
Liquidation preference (USD per share) | $ / shares   $ 25              
Preferred stock, redemption price per share (USD per share) | $ / shares   $ 25.00              
Preferred stock redemption period   120 days              
Common stock dividend per share (in dollars per share) | $ / shares   $ 0.225 $ 0.80 $ 0.80          
Common stock, par value (in dollars per share) | $ / shares   $ 0.01 $ 0.01            
Stock issued (in shares)   30,900,000              
Common stock issuance, net | $   $ 511,924 $ 804,398 $ 260,091          
Preferred stock issuance proceeds, net | $   $ 0 $ 215,073 $ 0          
Ordinary Income                  
Class of Stock [Line Items]                  
Common stock dividend per share (in dollars per share) | $ / shares   $ 0.180 $ 0.42 $ 0.37          
Capital Gain Distribution                  
Class of Stock [Line Items]                  
Common stock dividend per share (in dollars per share) | $ / shares   $ 0.045 0.13 0.12          
Return of Capital                  
Class of Stock [Line Items]                  
Common stock dividend per share (in dollars per share) | $ / shares     $ 0.25 $ 0.31          
Preferred Equity Distribution Agreement                  
Class of Stock [Line Items]                  
Stock issued (in shares)   0 1,972,888            
Preferred Stock, value, subscriptions (up to) | $           $ 50,000      
Preferred stock issuance proceeds, net | $     $ 48,400            
Preferred stock, available for future issuance | $   $ 82,400              
Preferred Equity Distribution Agreement | Minimum                  
Class of Stock [Line Items]                  
Sale of stock, Price per share (in dollars per share) | $ / shares     $ 24.88            
Equity Distribution Agreements                  
Class of Stock [Line Items]                  
Common stock, par value (in dollars per share) | $ / shares                 $ 0.01
Common stock subscriptions (up to) | $               $ 177,100 $ 100,000
Stock issued (in shares)   0 2,260,200 14,588,631          
Sale of stock, Price per share (in dollars per share) | $ / shares     $ 6.12            
Common stock issuance, net | $     $ 13,600 $ 89,000          
Common stock reserved for future issuance | $   $ 72,500              
Preferred Stock, value, subscriptions (up to) | $         $ 131,500        
Equity Distribution Agreements | Minimum                  
Class of Stock [Line Items]                  
Sale of stock, Price per share (in dollars per share) | $ / shares       $ 6.19          
Series B Preferred Stock                  
Class of Stock [Line Items]                  
Preferred stock, shares authorized (in shares)   6,000,000              
Preferred stock, shares outstanding (in shares)   3,156,087              
Preferred stock, shares issued (in shares)   3,156,087              
Preferred stock, dividend rate (as a percent)   7.75%              
Series C Preferred Stock                  
Class of Stock [Line Items]                  
Preferred stock, shares authorized (in shares)   6,600,000              
Preferred stock, shares outstanding (in shares)   4,181,807              
Preferred stock, shares issued (in shares)   4,181,807              
Preferred stock, dividend rate (as a percent)   7.875%              
Preferred stock, shares subscribed but unissued (in shares)             2,460,000    
Series D Preferred Stock                  
Class of Stock [Line Items]                  
Preferred stock, shares authorized (in shares)   8,400,000              
Preferred stock, shares outstanding (in shares)   6,123,495              
Preferred stock, shares issued (in shares)   6,123,495              
Preferred stock, dividend rate (as a percent)   8.00%              
Preferred stock, shares subscribed but unissued (in shares)             2,650,000    
Series E Preferred Stock                  
Class of Stock [Line Items]                  
Preferred stock, shares authorized (in shares)   9,900,000              
Preferred stock, par value (in dollars per share) | $ / shares $ 0.01                
Preferred stock, shares outstanding (in shares)   7,411,499              
Preferred stock, shares issued (in shares)   7,411,499              
Preferred stock, dividend rate (as a percent)   7.875%              
Preferred stock, shares subscribed but unissued (in shares)         3,000,000        
Series E Preferred Stock | Underwritten Public Offering                  
Class of Stock [Line Items]                  
Shares issued in transaction (in shares) 6,900,000                
Liquidation preference (USD per share) | $ / shares $ 25                
Proceeds from sale of stock | $ $ 166,700                
Preferred Stock                  
Class of Stock [Line Items]                  
Preferred stock, shares authorized (in shares)   30,900,000 30,900,000            
Preferred stock, par value (in dollars per share) | $ / shares   $ 0.01 $ 0.01            
Preferred stock, shares outstanding (in shares)   20,872,888 20,872,888            
Minimum number of quarters without dividends that result in voting rights | quarter   6              
Number of additional directors elected | director   2