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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, 2022

Sep. 30, 2021

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

Beginning balance

$ 465,706

$ 385,005

Transfers out of Level III

(13,988)

^[1]

(13,819)

^[2]

Transfers into Level III

5,351

^[3]

20,127

^[4]

Net accretion

11,286

23,180

Purchases

157,237

455,251

Sales/Paydowns/Return of Capital

(127,966)

(420,991)

Total realized gain (loss) included in earnings

(27,502)

(11,478)

Change in unrealized gain (loss) included in earnings

8,112

5,879

Ending balance

478,236

443,154

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

(8,838)

16,701

Debt securities

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

Beginning balance

392,432

334,245

Transfers out of Level III

(13,988)

^[1]

(13,819)

^[2]

Transfers into Level III

5,351

^[3]

20,127

^[4]

Net accretion

7,810

23,180

Purchases

153,420

443,996

Sales/Paydowns/Return of Capital

(120,378)

(409,189)

Total realized gain (loss) included in earnings

(14,624)

(7,209)

Change in unrealized gain (loss) included in earnings

2,222

(8,067)

Ending balance

412,245

383,264

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

(10,299)

7,905

Equity Securities

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

Beginning balance

20,992

12,537

Purchases

3,817

8,755

Sales/Paydowns/Return of Capital

(4,092)

(4,481)

Total realized gain (loss) included in earnings

1,271

174

Change in unrealized gain (loss) included in earnings

1,182

3,767

Ending balance

23,170

20,752

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

1,613

3,068

CLO Fund Securities

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

Beginning balance

31,632

19,583

Net accretion

3,476

Sales/Paydowns/Return of Capital

(5,571)

(6,441)

Total realized gain (loss) included in earnings

(12,054)

(5,323)

Change in unrealized gain (loss) included in earnings

(7,140)

9,355

Ending balance

24,623

17,174

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

4,722

4,031

Joint Ventures

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

Beginning balance

23,062

19,749

Purchases

2,500

Change in unrealized gain (loss) included in earnings

(4,872)

1,697

Ending balance

18,190

23,946

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

(4,872)

1,697

Derivatives

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

Beginning balance

(2,412)

(1,109)

Sales/Paydowns/Return of Capital

2,075

(880)

Total realized gain (loss) included in earnings

(2,095)

880

Change in unrealized gain (loss) included in earnings

2,440

(873)

Ending balance

8

$ (1,982)

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 $14.0 million relating to debt securities and equity securities for which pricing inputs, other than their quoted prices in active markets were observable as of September 30, 2022.
[2]	Transfers out of Level III represent a transfer of $13.8 million relating to debt securities for which pricing inputs, other than their quoted prices in active markets were observable as of September 30, 2021.
[3]	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.
[4]	Transfers into Level III represent a transfer of $20.1 million relating to debt securities for which pricing inputs, other than their quoted prices in active markets were unobservable as of September 30, 2021.

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