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Investments - Fair Value, Assets Measured on Recurring Basis (Details) - USD ($)
$ in Thousands

12 Months Ended

Dec. 31, 2022

Dec. 31, 2021

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Cost

$ 1,803,609

$ 1,792,304

^[1]

Fair value

$ 1,760,030

$ 1,754,039

^[2]

Investments at Cost and Fair Value | Investment Portfolio Concentration

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Percentage of Investment Portfolio

100.00%

100.00%

Senior secured first lien debt

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Cost

$ 1,638,995

$ 1,564,891

^[1]

Fair value

$ 1,579,512

$ 1,526,989

^[2]

Senior secured first lien debt | Investments at Cost and Fair Value | Investment Portfolio Concentration

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Percentage of Investment Portfolio

90.30%

91.60%

Senior secured second lien debt

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Cost

$ 41,036

$ 55,455

^[1]

Fair value

$ 38,769

$ 38,583

^[2]

Senior secured second lien debt | Investments at Cost and Fair Value | Investment Portfolio Concentration

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Percentage of Investment Portfolio

2.20%

2.30%

Collateralized securities and structured products - equity

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Cost

$ 2,687

$ 3,885

Fair value

$ 1,179

$ 2,998

Collateralized securities and structured products - equity | Investments at Cost and Fair Value | Investment Portfolio Concentration

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Percentage of Investment Portfolio

0.10%

0.20%

Unsecured debt

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Cost

$ 30,427

$ 26,777

^[1]

Fair value

$ 22,643

$ 26,616

^[2]

Unsecured debt | Investments at Cost and Fair Value | Investment Portfolio Concentration

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Percentage of Investment Portfolio

1.30%

1.60%

Equity

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Cost

$ 79,595

$ 53,379

^[1]

Fair value

$ 107,058

$ 70,936

^[2]

Equity | Investments at Cost and Fair Value | Investment Portfolio Concentration

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Percentage of Investment Portfolio

6.10%

4.30%

Investments, Excluding Short-Term Investments

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Cost

$ 1,792,740

$ 1,704,387

Fair value

1,749,161

1,666,122

Short term investments

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Cost

10,869

87,917

^[1]

Fair value

$ 10,869

$ 87,917

^[2]

[1]	Represents amortized cost for debt securities and cost for equity investments.
[2]	Fair value determined in good faith by the Company’s board of directors (see Note 9) using significant unobservable inputs unless otherwise noted.

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+ References

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-Publisher FASB
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