Quarterly report pursuant to Section 13 or 15(d)

Description of Business - Stock Issuance (Details)

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Description of Business - Stock Issuance (Details) - shares
9 Months Ended 12 Months Ended
Apr. 09, 2021
Dec. 15, 2020
Sep. 30, 2021
Dec. 31, 2020
8.625% Series A Cumulative, Perpetual Preferred Stock        
Stock        
Preferred stock, dividend rate (as a percent)   8.625% 8.625% 8.625%
8.375% Series B Cumulative, Perpetual Preferred Stock        
Stock        
Preferred stock, dividend rate (as a percent) 8.375%   8.375% 8.375%
Depositary share's fractional interest in share of preferred stock 0.001   0.001