Series C Preferred Stock [Member] Accretable Yield Estimates Of Our CLO Equity Investments Risk [Member] Accretable Yield Estimates Of Our CLO Equity Investments Risk Stock Dividend Risk [Member] Stock Dividend Risk Document Information [Line Items] Securities Risk [Member] Securities Risk Liquidity Risks [Member] Liquidity Risks Fair Valuation Of Our Portfolio Investments Risk [Member] Fair Valuation Of Our Portfolio Investments Risk Amendment Flag High Yield Investment Risks [Member] High Yield Investment Risks Non-Diversification Risk [Member] Non-Diversification Risk CLO Rating Downgrade Risk [Member] CLO Rating Downgrade Risk Tax Risks [Member] Tax Risks Credit Risk [Member] Document Period End Date Currency Risk [Member] Currency Risk Series D Preferred Stock [Member] Net Asset Value Per Share Entity Central Index Key Incentive Fee Risk [Member] Incentive Fee Risk Market Risks [Member] Market Risks Counterparty Risks [Member] Counterparty Risks Document Type Risks Of Investing In CLOs And Other Structured Finance Securitie [Member] Risks Of Investing In CLOs And Other Structured Finance Securitie Securities Investment Risk [Member] Securities Investment Risk Fair Value, Option, Quantitative Disclosures [Line Items] Fair Value, Option, Quantitative Disclosures [Line Items] Class of Stock [Domain] Class of Stock [Domain] Conflicts Of Interest Risk [Member] Conflicts Of Interest Risk Statement of Income Location, Balance [Domain] Statement of Income Location, Balance [Domain] Fair Value Disclosures [Abstract] Series F Preferred Stock Series F Preferred Stock [Member] Fair Value Option, Disclosures [Table] Fair Value Option, Disclosures [Table] Series E Preferred Stock [Member] Series A Preferred Stock [Member] Financial Instruments [Domain] Financial Instruments [Domain] Limited Investment Opportunities Risk [Member] Limited Investment Opportunities Risk Redeemable Preferred Stock [Member] Entity Inv Company Type Risks Of Investing In The Subordinated Or Equity Tranche Of CLOs [Member] Risks Of Investing In The Subordinated Or Equity Tranche Of CLOs Statement of Income Location, Balance [Axis] Statement of Income Location, Balance [Axis] Financial Instrument [Axis] Financial Instrument [Axis] Investments Risk [Member] Investments Risk Business And Structure Risk [Member] Business And Structure Risk Leverage Risk [Member] Leverage Risk Document Information [Table] Loan Accumulation Facilities Risk [Member] Loan Accumulation Facilities Risk Class of Stock [Axis] Current Fiscal Year End Date Key Personnel Risk [Member] Key Personnel Risk Entity Registrant Name Prepayment Risk [Member] First Loss Risk Of CLO Equity And Subordinated Securities [Member] First Loss Risk Of CLO Equity And Subordinated Securities Events Outside Of The Company’s Control [Member] Events Outside Of The Company’s Control Distributions And Dividend Risk [Member] Distributions And Dividend Risk Series B Preferred Stock [Member]