Term Preferred Shares [Member] Common Stock [Member] Conflicts to Interest Risk [Member] Mandatorily Redeemable Preferred Stock [Member] Notes Payable [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] 6.75% UNSECURED NOTES DUE 2031 [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] 6.25% Series 2027 Term Preferred Shares [Member] 6.00% Series 2029 Term Preferred Shares [Member] Seven Point One Twenty Five Percentage Series Two Thousand Twenty Nine Term Preferred Shares [Member] Repurchase Agreement [Member] Six Point Seventy Five Unsecured Notes Due2031 Member Sixtwofive Series2027 Term Preferred Shares Member Sixthundred Series2029 Term Preferred Shares Member Mandatorily Redeemable Preferred Stock [Member] Six Point Seventy Five Percentage Series Two Thousand Twenty Four Term Preferred Shares Member Eight Point One Twenty Five Percentage Series Two Thousand Twenty Four Term Preferred Shares Member 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 Percentage Series Two Thousand Twenty Nine Term Preferred Shares Member sixsevenfive UNSECUREDNOTESDUE2031 Member Seven Point One Twenty Five Percentage Series Two Thousand Twenty Nine Term Preferred Shares Member Seven Point Fifty Percentage Series Two Thousand Twenty Three Term Preferred Shares Member Conflicts To Interest Risk Member Sevenonetwofive Series2029 Term Preferred Shares Member Common Stock [Member] Notes Payable Member Eight Point Fifty Percentage Series Two Thousand And Seventeen Term Preferred Shares Member Repurchase Agreement Member