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Investments - Composition of Investment Portfolio At Cost And Fair Value (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Summary of Investment Holdings [Line Items]
Cost	$ 2,562,398	$ 1,787,824
Fair Value	$ 2,448,935	$ 1,800,594
% of Net Assets	205.40%	242.70%
Jocassee Partners LLC
Summary of Investment Holdings [Line Items]
Fair Value	$ 1,209,063	$ 1,245,647
Thompson Rivers LLC
Summary of Investment Holdings [Line Items]
Cost	949,279	3,024,529
Fair Value	890,911	$ 3,063,035
Sierra JV
Summary of Investment Holdings [Line Items]
Cost	125,220
Fair Value	$ 110,047
Percentage of Total Portfolio | Investment Type Concentration Risk
Summary of Investment Holdings [Line Items]
Percent of Total Portfolio	100.00%	100.00%
Percentage of Total Portfolio | Investment Type Concentration Risk | Thompson Rivers LLC
Summary of Investment Holdings [Line Items]
Percent of Total Portfolio	100.00%	100.00%
Percentage of Total Portfolio | Investment Type Concentration Risk | Sierra JV
Summary of Investment Holdings [Line Items]
Percent of Total Portfolio	100.00%
Investment Owned, At Fair Value | Investment Type Concentration Risk
Summary of Investment Holdings [Line Items]
Percent of Total Portfolio	100.00%	100.00%
Investment Owned, At Fair Value | Investment Type Concentration Risk | Thompson Rivers LLC
Summary of Investment Holdings [Line Items]
Percent of Total Portfolio	100.00%	100.00%
Investment Owned, At Fair Value | Investment Type Concentration Risk | Sierra JV
Summary of Investment Holdings [Line Items]
Percent of Total Portfolio	100.00%
Senior debt and 1st lien notes
Summary of Investment Holdings [Line Items]
Cost	$ 1,752,943	$ 1,217,899
Fair Value	$ 1,696,192	$ 1,221,598
% of Net Assets	142.00%	165.00%
Senior debt and 1st lien notes | Jocassee Partners LLC
Summary of Investment Holdings [Line Items]
Cost	$ 1,177,895	$ 1,084,502
Fair Value	1,123,760	$ 1,085,172
Senior debt and 1st lien notes | Sierra JV
Summary of Investment Holdings [Line Items]
Cost	125,220
Fair Value	$ 110,047
Senior debt and 1st lien notes | Percentage of Total Portfolio | Investment Type Concentration Risk
Summary of Investment Holdings [Line Items]
Percent of Total Portfolio	69.00%	68.00%
Senior debt and 1st lien notes | Percentage of Total Portfolio | Investment Type Concentration Risk | Jocassee Partners LLC
Summary of Investment Holdings [Line Items]
Percent of Total Portfolio	91.00%	87.00%
Senior debt and 1st lien notes | Percentage of Total Portfolio | Investment Type Concentration Risk | Sierra JV
Summary of Investment Holdings [Line Items]
Percent of Total Portfolio	100.00%
Senior debt and 1st lien notes | Investment Owned, At Fair Value | Investment Type Concentration Risk
Summary of Investment Holdings [Line Items]
Percent of Total Portfolio	69.00%	68.00%
Senior debt and 1st lien notes | Investment Owned, At Fair Value | Investment Type Concentration Risk | Jocassee Partners LLC
Summary of Investment Holdings [Line Items]
Percent of Total Portfolio	92.00%	86.00%
Senior debt and 1st lien notes | Investment Owned, At Fair Value | Investment Type Concentration Risk | Sierra JV
Summary of Investment Holdings [Line Items]
Percent of Total Portfolio	100.00%
Subordinated debt and 2nd lien notes
Summary of Investment Holdings [Line Items]
Cost	$ 326,639	$ 253,551
Fair Value	$ 263,139	$ 240,037
% of Net Assets	22.00%	32.00%
Subordinated debt and 2nd lien notes | Jocassee Partners LLC
Summary of Investment Holdings [Line Items]
Cost	$ 23,141	$ 23,607
Fair Value	$ 21,659	$ 24,011
Subordinated debt and 2nd lien notes | Percentage of Total Portfolio | Investment Type Concentration Risk
Summary of Investment Holdings [Line Items]
Percent of Total Portfolio	13.00%	14.00%
Subordinated debt and 2nd lien notes | Percentage of Total Portfolio | Investment Type Concentration Risk | Jocassee Partners LLC
Summary of Investment Holdings [Line Items]
Percent of Total Portfolio	2.00%	2.00%
Subordinated debt and 2nd lien notes | Investment Owned, At Fair Value | Investment Type Concentration Risk
Summary of Investment Holdings [Line Items]
Percent of Total Portfolio	11.00%	13.00%
Subordinated debt and 2nd lien notes | Investment Owned, At Fair Value | Investment Type Concentration Risk | Jocassee Partners LLC
Summary of Investment Holdings [Line Items]
Percent of Total Portfolio	2.00%	2.00%
Structured Products
Summary of Investment Holdings [Line Items]
Cost	$ 88,805	$ 37,055
Fair Value	$ 73,550	$ 40,271
% of Net Assets	6.00%	6.00%
Structured Products | Jocassee Partners LLC
Summary of Investment Holdings [Line Items]
Cost		$ 4,569
Fair Value		$ 5,410
Structured Products | Percentage of Total Portfolio | Investment Type Concentration Risk
Summary of Investment Holdings [Line Items]
Percent of Total Portfolio	3.00%	2.00%
Structured Products | Percentage of Total Portfolio | Investment Type Concentration Risk | Jocassee Partners LLC
Summary of Investment Holdings [Line Items]
Percent of Total Portfolio		0.00%
Structured Products | Investment Owned, At Fair Value | Investment Type Concentration Risk
Summary of Investment Holdings [Line Items]
Percent of Total Portfolio	3.00%	2.00%
Structured Products | Investment Owned, At Fair Value | Investment Type Concentration Risk | Jocassee Partners LLC
Summary of Investment Holdings [Line Items]
Percent of Total Portfolio		1.00%
Equity shares
Summary of Investment Holdings [Line Items]
Cost	$ 230,188	$ 145,791
Fair Value	$ 284,570	$ 154,477
% of Net Assets	24.00%	21.00%
Equity shares | Jocassee Partners LLC
Summary of Investment Holdings [Line Items]
Cost	$ 8,521	$ 5,448
Fair Value	$ 2,458	$ 3,887
Equity shares | Percentage of Total Portfolio | Investment Type Concentration Risk
Summary of Investment Holdings [Line Items]
Percent of Total Portfolio	9.00%	8.00%
Equity shares | Percentage of Total Portfolio | Investment Type Concentration Risk | Jocassee Partners LLC
Summary of Investment Holdings [Line Items]
Percent of Total Portfolio	0.00%	1.00%
Equity shares | Investment Owned, At Fair Value | Investment Type Concentration Risk
Summary of Investment Holdings [Line Items]
Percent of Total Portfolio	12.00%	9.00%
Equity shares | Investment Owned, At Fair Value | Investment Type Concentration Risk | Jocassee Partners LLC
Summary of Investment Holdings [Line Items]
Percent of Total Portfolio	0.00%	0.00%
Equity warrants
Summary of Investment Holdings [Line Items]
Cost	$ 178	$ 1,111
Fair Value	$ 1,057	$ 1,107
% of Net Assets	0.00%	0.00%
Equity warrants | Jocassee Partners LLC
Summary of Investment Holdings [Line Items]
Cost	$ 31	$ 31
Fair Value	$ 158	$ 75
Equity warrants | Percentage of Total Portfolio | Investment Type Concentration Risk
Summary of Investment Holdings [Line Items]
Percent of Total Portfolio	0.00%	0.00%
Equity warrants | Percentage of Total Portfolio | Investment Type Concentration Risk | Jocassee Partners LLC
Summary of Investment Holdings [Line Items]
Percent of Total Portfolio	0.00%	0.00%
Equity warrants | Investment Owned, At Fair Value | Investment Type Concentration Risk
Summary of Investment Holdings [Line Items]
Percent of Total Portfolio	0.00%	0.00%
Equity warrants | Investment Owned, At Fair Value | Investment Type Concentration Risk | Jocassee Partners LLC
Summary of Investment Holdings [Line Items]
Percent of Total Portfolio	0.00%	0.00%
Investment in joint ventures / PE fund
Summary of Investment Holdings [Line Items]
Cost	$ 163,645	$ 132,417
Fair Value	$ 130,427	$ 143,104
% of Net Assets	11.00%	19.00%
Investment in joint ventures / PE fund | Percentage of Total Portfolio | Investment Type Concentration Risk
Summary of Investment Holdings [Line Items]
Percent of Total Portfolio	6.00%	8.00%
Investment in joint ventures / PE fund | Investment Owned, At Fair Value | Investment Type Concentration Risk
Summary of Investment Holdings [Line Items]
Percent of Total Portfolio	5.00%	8.00%
Federal Housing Administration (“FHA”) loans | Thompson Rivers LLC
Summary of Investment Holdings [Line Items]
Cost	$ 864,625	$ 2,799,869
Fair Value	$ 811,358	$ 2,839,495
Federal Housing Administration (“FHA”) loans | Percentage of Total Portfolio | Investment Type Concentration Risk | Thompson Rivers LLC
Summary of Investment Holdings [Line Items]
Percent of Total Portfolio	91.00%	93.00%
Federal Housing Administration (“FHA”) loans | Investment Owned, At Fair Value | Investment Type Concentration Risk | Thompson Rivers LLC
Summary of Investment Holdings [Line Items]
Percent of Total Portfolio	91.00%	93.00%
Veterans Affairs (“VA”) loans | Thompson Rivers LLC
Summary of Investment Holdings [Line Items]
Cost	$ 84,654	$ 224,660
Fair Value	$ 79,553	$ 223,540
Veterans Affairs (“VA”) loans | Percentage of Total Portfolio | Investment Type Concentration Risk | Thompson Rivers LLC
Summary of Investment Holdings [Line Items]
Percent of Total Portfolio	9.00%	7.00%
Veterans Affairs (“VA”) loans | Investment Owned, At Fair Value | Investment Type Concentration Risk | Thompson Rivers LLC
Summary of Investment Holdings [Line Items]
Percent of Total Portfolio	9.00%	7.00%
Investment in joint ventures | Jocassee Partners LLC
Summary of Investment Holdings [Line Items]
Cost	$ 75,941	$ 111,490
Fair Value	$ 61,028	$ 127,092
Investment in joint ventures | Percentage of Total Portfolio | Investment Type Concentration Risk | Jocassee Partners LLC
Summary of Investment Holdings [Line Items]
Percent of Total Portfolio	6.00%	9.00%
Investment in joint ventures | Investment Owned, At Fair Value | Investment Type Concentration Risk | Jocassee Partners LLC
Summary of Investment Holdings [Line Items]
Percent of Total Portfolio	5.00%	10.00%
Short-term investments | Jocassee Partners LLC
Summary of Investment Holdings [Line Items]
Cost	$ 10,826	$ 12,572
Fair Value	$ 10,826	$ 12,572
Short-term investments | Percentage of Total Portfolio | Investment Type Concentration Risk | Jocassee Partners LLC
Summary of Investment Holdings [Line Items]
Percent of Total Portfolio	1.00%	1.00%
Short-term investments | Investment Owned, At Fair Value | Investment Type Concentration Risk | Jocassee Partners LLC
Summary of Investment Holdings [Line Items]
Percent of Total Portfolio	1.00%	1.00%
Long-Term Investment | Jocassee Partners LLC
Summary of Investment Holdings [Line Items]
Cost	$ 1,296,355	$ 1,242,219
Fair Value	$ 1,219,889	$ 1,258,219
Long-Term Investment | Percentage of Total Portfolio | Investment Type Concentration Risk | Jocassee Partners LLC
Summary of Investment Holdings [Line Items]
Percent of Total Portfolio	100.00%	100.00%
Long-Term Investment | Investment Owned, At Fair Value | Investment Type Concentration Risk | Jocassee Partners LLC
Summary of Investment Holdings [Line Items]
Percent of Total Portfolio	100.00%	100.00%

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