Common Stock [Member] Conflicts to Interest Risk [Member] Increased Net Earnings Risk [Member] Leverage Risk [Member] Retention Risk [Member] COVID-19 Pandemic Risk [Member] CLO [Member] Mandatorily Redeemable Preferred Stock [Member] Term Preferred Shares [Member] 6.75% Series 2024 Term Preferred Shares [Member] 6.25% Series 2027 Term Preferred Shares [Member] 6.00% Series 2029 Term Preferred Shares [Member] 7.125% Series 2029 Term Preferred Shares [Member] Notes Payable [Member] 6.75% Unsecured Notes due 2031 [Member] 5.00% Unsecured Notes due 2027 [Member] 8.50% Series 2017 Term Preferred Shares [Member] 7.50% Series 2023 Term Preferred Shares [Member] 8.125% Series 2024 Term Preferred Shares [Member] 6.75% Series 2024 Term Preferred Shares [Member] 6.25% Series 2027 Term Preferred Shares [Member] 6.00% Series 2029 Term Preferred Shares [Member] 7.125% Series 2029 Term Preferred Shares [Member] Repurchase Agreement [Member] Six Point Seventy Five Unsecured Notes Due2031 Member Leverage Risk Member Mandatorily Redeemable Preferred Stock [Member] Six Point Sevenfive Series Two Zero Two Four Term Preferred Shares Member Six Point Zero Zero Series Two Zero Two Nine Term Preferred Shares Member Eight Point One Twenty Five Percentage Series Two Thousand Twenty Four Term Preferred Shares Member Six Point Seventy Five Percentage Series Two Thousand Twenty Four Term Preferred Shares Member Seven Point One Two Five Series Two Thousand Twenty Nine Term Preferred Shares Member CLOMember Term Preferred Shares Member Six Point Twenty Five Percentage Series Two Thousand Twenty Seven Term Preferred Shares Member Five Percentage Unsecured Notes Due2027 Member Six Point Twofive Series Two Zero Two Seven Term Preferred Shares Member Six Percentage Series Two Thousand Twenty Nine Term Preferred Shares Member Increased Net Earnings Risk Member Seven Point Fifty Percentage Series Two Thousand Twenty Three Term Preferred Shares Member Conflicts To Interest Risk Member Common Stock [Member] COVID19 Pandemic Risk Member Seven Point One Two Five Series Two Zero Two Nine Term Preferred Shares Member Notes Payable Member Eight Point Fifty Percentage Series Two Thousand And Seventeen Term Preferred Shares Member Retention Risk Member Repurchase Agreement Member