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Investments - Summary of Information Relating to Investments Measured at Fair Value for Company has Used Unobservable Inputs to Determine Fair Value (Details) - USD ($)
$ in Thousands

9 Months Ended

Sep. 30, 2023

Sep. 30, 2022

Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]

Beginning balance

$ 471,170

$ 465,706

Transfers out of Level III

(8,332)

^[1]

(13,988)

^[2]

Transfers into Level III

6,369

^[3]

5,351

^[4]

Net accretion

6,690

11,286

Purchases

30,613

157,237

Sales/Paydowns/Return of Capital

(87,335)

(127,966)

Total realized gain (loss) included in earnings

(11,119)

(27,502)

Change in unrealized gain (loss) included in earnings

(11,474)

8,112

Ending balance

396,582

478,236

Changes in unrealized gains (losses) included in earnings related to investments still held at reporting date

(14,759)

8,838

Debt securities

Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]

Beginning balance

410,144

392,432

Transfers out of Level III

(8,332)

^[1]

(13,988)

^[2]

Transfers into Level III

6,369

^[3]

5,351

^[4]

Net accretion

4,811

7,810

Purchases

30,135

153,420

Sales/Paydowns/Return of Capital

(83,336)

(120,378)

Total realized gain (loss) included in earnings

(800)

(14,624)

Change in unrealized gain (loss) included in earnings

(7,203)

2,222

Ending balance

351,788

412,245

Changes in unrealized gains (losses) included in earnings related to investments still held at reporting date

(12,279)

(10,299)

Equity Securities

Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]

Beginning balance

21,905

20,992

Purchases

478

3,817

Sales/Paydowns/Return of Capital

(2,258)

(4,092)

Total realized gain (loss) included in earnings

2,599

1,271

Change in unrealized gain (loss) included in earnings

(3,535)

1,182

Ending balance

19,189

23,170

Changes in unrealized gains (losses) included in earnings related to investments still held at reporting date

(1,743)

1,613

CLO Fund Securities

Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]

Beginning balance

20,453

31,632

Net accretion

1,879

3,476

Sales/Paydowns/Return of Capital

(1,741)

(5,571)

Total realized gain (loss) included in earnings

(12,918)

(12,054)

Change in unrealized gain (loss) included in earnings

2,752

(7,140)

Ending balance

10,425

24,623

Changes in unrealized gains (losses) included in earnings related to investments still held at reporting date

2,752

(4,722)

Joint Ventures

Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]

Beginning balance

18,668

23,062

Change in unrealized gain (loss) included in earnings

(3,488)

(4,872)

Ending balance

15,180

18,190

Changes in unrealized gains (losses) included in earnings related to investments still held at reporting date

$ (3,488)

(4,872)

Derivatives

Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]

Beginning balance

(2,412)

Sales/Paydowns/Return of Capital

2,075

Total realized gain (loss) included in earnings

(2,095)

Change in unrealized gain (loss) included in earnings

2,440

Ending balance

8

Changes in unrealized gains (losses) included in earnings related to investments still held at reporting date

$ 2

[1]	Transfers out of Level III represent a transfer of $8.3 million relating to debt securities for which pricing inputs, other than their quoted prices in active markets were observable as of September 30, 2023.
[2]	Transfers out of Level III represent a transfer of $14.0 million relating to debt securities for which pricing inputs, other than their quoted prices in active markets were observable as of September 30, 2022.
[3]	Transfers into Level III represent a transfer of $6.4 million relating to debt securities for which pricing inputs, other than their quoted prices in active markets were unobservable as of September 30, 2023.
[4]	Transfers into Level III represent a transfer of $5.4 million relating to debt securities for which pricing inputs, other than their quoted prices in active markets were unobservable as of September 30, 2022.

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