Quarterly report pursuant to Section 13 or 15(d)

Stockholders??? Equity (Preferred Stock) (Narrative) (Details)

v3.21.2
Stockholders’ Equity (Preferred Stock) (Narrative) (Details)
 3 Months Ended 9 Months Ended 12 Months Ended
Oct. 04, 2021
USD ($)
$ / shares
Sep. 30, 2021
USD ($)
$ / shares
Sep. 30, 2020
USD ($)
Sep. 30, 2021
USD ($)
item
$ / shares
Sep. 30, 2020
USD ($)
Dec. 31, 2020
Class of Stock [Line Items]            
Redeemable preferred stock, redemption price per share | $ / shares   $ 25.00   $ 25.00    
Distributions to preferred stockholders   $ 12,000,000.0 $ 12,000,000.0 $ 36,139,000 $ 36,139,000  
Number of quarterly dividends in arrearage before preferred stockholders can elect additional board members | item       6    
Number of additional board members the preferred stockholders can elect in the case of an excess arrearage of quarterly dividends | item       2    
Dividends in arrears       $ 0    
Series W Preferred Stock [Member]            
Class of Stock [Line Items]            
Cumulative preferred stock, dividend rate       5.20%   5.20%
Series Z Preferred Stock [Member]            
Class of Stock [Line Items]            
Cumulative preferred stock, dividend rate       4.875%   4.875%
Subsequent Event [Member]            
Class of Stock [Line Items]            
Preferred Redemption allocation $ 190,700,000          
Subsequent Event [Member] | Series W Preferred Stock [Member]            
Class of Stock [Line Items]            
Redeemable preferred stock, redemption price per share | $ / shares $ 25.00