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Stockholders' Equity - Narrative (Details)
$ / shares in Units, $ in Thousands
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2022
USD ($)
quarter
director
seriesOfPreferredStock
$ / shares
shares
Sep. 30, 2021
shares
Sep. 30, 2022
USD ($)
quarter
director
seriesOfPreferredStock
$ / shares
shares
Sep. 30, 2021
shares
Dec. 31, 2021
$ / shares
shares
Feb. 28, 2022
USD ($)
Aug. 10, 2021
USD ($)
$ / shares
Nov. 27, 2019
USD ($)
Mar. 29, 2019
USD ($)
Aug. 10, 2017
USD ($)
Class of Stock [Line Items]                    
Number of series of cumulative redeemable preferred stock outstanding | seriesOfPreferredStock 4   4              
Redemption price (in dollars per share) | $ / shares $ 25.00   $ 25.00              
Preferred stock redemption period     120 days              
Number of elected directors pending preferred stock voting rights | director 2   2              
Percent of outstanding shares affirmative votes needed for material and adverse changes to preferred stock terms     66.67%              
Common stock, shares authorized (in shares) 800,000,000   800,000,000   800,000,000          
Common stock, par value (in usd per share) | $ / shares $ 0.01   $ 0.01   $ 0.01          
Common stock, shares, issued (in shares) 373,150,076   373,150,076   379,405,240          
Common stock, shares outstanding (in shares) 373,150,076   373,150,076   379,405,240          
Stock repurchase program, authorized amount | $           $ 200,000        
Shares repurchased (in shares) 5,469,318   8,264,142              
Common stock repurchases | $ $ 14,314   $ 21,855              
Fees and commissions paid | $ $ 100   $ 100              
Average cost per share (in usd per share) | $ / shares $ 2.62   $ 2.64              
Remaining authorized repurchase amount | $ $ 178,200   $ 178,200              
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) | $             $ 100,000      
Common stock reserved for issuance | $ $ 100,000   $ 100,000             $ 72,500
Shares issued (in shares) 0 0 0 0            
Equity agreement for preferred stock maximum aggregate sales price (up to) | $             $ 149,100 $ 131,500    
Preferred Equity Distribution Agreement                    
Class of Stock [Line Items]                    
Shares issued (in shares) 0 0 0 0            
Equity agreement for preferred stock maximum aggregate sales price (up to) | $                 $ 50,000  
Preferred stock available for future issuance, value | $ $ 100,000   $ 100,000              
Preferred Stock                    
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 usd per share) | $ / shares $ 0.01   $ 0.01   $ 0.01          
Preferred stock, shares issued (in shares) 22,284,994   22,284,994   22,284,994          
Preferred stock, shares outstanding (in shares) 22,284,994   22,284,994   22,284,994          
Number of quarters with no dividends that results in voting rights | quarter 6   6              
Series D Preferred Stock                    
Class of Stock [Line Items]                    
Preferred stock, shares authorized (in shares) 8,400,000   8,400,000   8,400,000          
Preferred stock, shares issued (in shares) 6,123,495   6,123,495   6,123,495          
Preferred stock, shares outstanding (in shares) 6,123,495   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   9,900,000          
Preferred stock, shares issued (in shares) 7,411,499   7,411,499   7,411,499          
Preferred stock, shares outstanding (in shares) 7,411,499   7,411,499   7,411,499          
Preferred stock, cumulative redeemable dividend rate     7.875%   7.875%          
Series F Preferred Stock                    
Class of Stock [Line Items]                    
Preferred stock, shares authorized (in shares) 7,750,000   7,750,000   7,750,000          
Preferred stock, shares issued (in shares) 5,750,000   5,750,000   5,750,000          
Preferred stock, shares outstanding (in shares) 5,750,000   5,750,000   5,750,000          
Preferred stock, cumulative redeemable dividend rate     6.875%   6.875%          
Series G Preferred Stock                    
Class of Stock [Line Items]                    
Preferred stock, shares authorized (in shares) 5,450,000   5,450,000   3,450,000          
Preferred stock, shares issued (in shares) 3,000,000   3,000,000   3,000,000          
Preferred stock, shares outstanding (in shares) 3,000,000   3,000,000   3,000,000          
Preferred stock, cumulative redeemable dividend rate     7.00%   7.00%