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) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Apr. 09, 2021
Dec. 15, 2020
Mar. 31, 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%
Public Offering of Depository Shares and Series B Preferred Shares | Depositary Shares 8.375% Series B Cumulative, Perpetual Preferred Stock | Subsequent Event        
Stock        
Shares issued (in shares) 1,600,000      
Depositary share's fractional interest in share of preferred stock 0.001      
Preferred stock, dividend rate (as a percent) 8.375%      
Gross proceeds from issuance of preferred stock $ 40.0