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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

3 Months Ended

Mar. 31, 2023

Mar. 31, 2022

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

Beginning balance

$ 471,170

$ 465,706

Transfers out of Level III

(5,585)

^[1]

(11,239)

^[2]

Transfers into Level III

6,519

^[3]

9,432

^[4]

Net accretion

2,745

4,916

Purchases

8,948

53,926

Sales/Paydowns/Return of Capital

(35,203)

(40,828)

Total realized gain (loss) included in earnings

(3,054)

(5,554)

Change in unrealized gain (loss) included in earnings

(5,414)

2,739

Ending balance

440,126

479,098

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

(8,033)

3,737

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

(5,585)

^[1]

(11,239)

^[2]

Transfers into Level III

6,519

^[3]

9,432

^[4]

Net accretion

2,197

3,282

Purchases

8,880

53,926

Sales/Paydowns/Return of Capital

(29,317)

(38,627)

Total realized gain (loss) included in earnings

(31)

(3,671)

Change in unrealized gain (loss) included in earnings

(3,318)

1,444

Ending balance

389,489

406,979

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

(6,986)

(2,752)

Equity Securities

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

Beginning balance

21,905

20,992

Purchases

68

Sales/Paydowns/Return of Capital

(5,429)

(2,257)

Total realized gain (loss) included in earnings

858

212

Change in unrealized gain (loss) included in earnings

(2,082)

2,069

Ending balance

15,320

21,016

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

(1,032)

2,216

CLO Fund Securities

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

Beginning balance

20,453

31,632

Net accretion

548

1,634

Sales/Paydowns/Return of Capital

(457)

(2,032)

Total realized gain (loss) included in earnings

(3,881)

Change in unrealized gain (loss) included in earnings

2,578

(2,177)

Ending balance

19,241

29,057

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

2,578

(2,177)

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

(2,592)

(1,039)

Ending balance

16,076

22,023

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

$ (2,592)

(1,039)

Derivatives

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

Beginning balance

(2,412)

Sales/Paydowns/Return of Capital

2,088

Total realized gain (loss) included in earnings

(2,095)

Change in unrealized gain (loss) included in earnings

2,442

Ending balance

23

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

$ 14

[1]	Transfers out of Level III represent a transfer of $5.6 million relating to debt securities for which pricing inputs, other than their quoted prices in active markets were observable as of March 31, 2023.
[2]	Transfers out of Level III represent a transfer of $11.2 million relating to debt securities for which pricing inputs, other than their quoted prices in active markets were observable as of March 31, 2022.
[3]	Transfers into Level III represent a transfer of $6.5 million relating to debt securities for which pricing inputs, other than their quoted prices in active markets were unobservable as of March 31, 2023.
[4]	Transfers into Level III represent a transfer of $9.4 million relating to debt securities for which pricing inputs, other than their quoted prices in active markets were unobservable as of March 31, 2022.

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