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Equity - Preferred Stock (Details) - $ / shares
3 Months Ended 9 Months Ended 12 Months Ended
Oct. 09, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Sep. 30, 2020
Dec. 31, 2019
Class of Stock [Line Items]                    
Preferred Stock, Shares Authorized   20,000,000     20,000,000       20,000,000 20,000,000
Series C Preferred Stock                    
Class of Stock [Line Items]                    
Preferred Stock, Shares Issued   3,000,000     3,000,000       3,000,000 3,000,000
Preferred Stock, Liquidation Preference Per Share   $ 25.00     $ 25.00       $ 25.00 $ 25.00
Dividend rate (as a percent)                 6.875%  
Preferred Stock, Dividends Per Share, Declared   $ 0.4296875 $ 0.4296875 $ 0.4296875 $ 0.4296875 $ 0.4296875 $ 0.4296875 $ 0.4296875 $ 1.2890625 $ 1.7187500
Dividends Payable, Date Declared   Jul. 09, 2020 Apr. 09, 2020 Jan. 08, 2020 Oct. 15, 2019 Jul. 15, 2019 Apr. 09, 2019 Jan. 10, 2019    
Dividends Payable, Date to be Paid   Sep. 30, 2020 Jun. 30, 2020 Mar. 31, 2020 Dec. 31, 2019 Sep. 30, 2019 Jul. 01, 2019 Apr. 01, 2019    
Subsequent Event [Member] | Series C Preferred Stock                    
Class of Stock [Line Items]                    
Preferred Stock, Dividends Per Share, Declared $ 0.4296875