INVESTMENTS - Composition of Investment Portfolio At Cost And Fair Value (Details) - USD ($) $ in Thousands	9 Months Ended		12 Months Ended
	Sep. 30, 2025		Dec. 31, 2024		May 12, 2021
Schedule of Equity Method Investments [Line Items]
Cost	$ 4,478,081		$ 3,117,330		$ 602,400
Fair Value	$ 4,479,835		$ 3,094,065
Percentage of Total Net Assets	169.30%	[1]	156.50%	[2]
CPCF BPCC LLC
Schedule of Equity Method Investments [Line Items]
Cost			$ 222,535
Fair Value			219,644
Thompson Rivers LLC
Schedule of Equity Method Investments [Line Items]
Cost	$ 132,127		207,570
Fair Value	$ 124,689		$ 193,351
Cost | Investment Type Concentration Risk
Schedule of Equity Method Investments [Line Items]
Percentage of Total Portfolio	100.00%		100.00%
Cost | Investment Type Concentration Risk | CPCF BPCC LLC
Schedule of Equity Method Investments [Line Items]
Percentage of Total Portfolio			100.00%
Cost | Investment Type Concentration Risk | Thompson Rivers LLC
Schedule of Equity Method Investments [Line Items]
Percentage of Total Portfolio	100.00%		100.00%
Fair Value | Investment Type Concentration Risk
Schedule of Equity Method Investments [Line Items]
Percentage of Total Portfolio	100.00%		100.00%
Fair Value | Investment Type Concentration Risk | CPCF BPCC LLC
Schedule of Equity Method Investments [Line Items]
Percentage of Total Portfolio			100.00%
Fair Value | Investment Type Concentration Risk | Thompson Rivers LLC
Schedule of Equity Method Investments [Line Items]
Percentage of Total Portfolio	100.00%		100.00%
Senior debt and 1st lien notes
Schedule of Equity Method Investments [Line Items]
Cost	$ 3,814,013		$ 2,552,342
Fair Value	$ 3,798,999		$ 2,503,156
Percentage of Total Net Assets	144.00%		127.00%
Senior debt and 1st lien notes | CPCF BPCC LLC
Schedule of Equity Method Investments [Line Items]
Cost			$ 222,535
Fair Value			$ 219,644
Senior debt and 1st lien notes | Cost | Investment Type Concentration Risk
Schedule of Equity Method Investments [Line Items]
Percentage of Total Portfolio	86.00%		82.00%
Senior debt and 1st lien notes | Cost | Investment Type Concentration Risk | CPCF BPCC LLC
Schedule of Equity Method Investments [Line Items]
Percentage of Total Portfolio			100.00%
Senior debt and 1st lien notes | Fair Value | Investment Type Concentration Risk
Schedule of Equity Method Investments [Line Items]
Percentage of Total Portfolio	85.00%		81.00%
Senior debt and 1st lien notes | Fair Value | Investment Type Concentration Risk | CPCF BPCC LLC
Schedule of Equity Method Investments [Line Items]
Percentage of Total Portfolio			100.00%
Subordinated debt and 2nd lien notes
Schedule of Equity Method Investments [Line Items]
Cost	$ 191,676		$ 125,971
Fair Value	$ 187,919		$ 122,748
Percentage of Total Net Assets	7.00%		6.00%
Subordinated debt and 2nd lien notes | Cost | Investment Type Concentration Risk
Schedule of Equity Method Investments [Line Items]
Percentage of Total Portfolio	4.00%		4.00%
Subordinated debt and 2nd lien notes | Fair Value | Investment Type Concentration Risk
Schedule of Equity Method Investments [Line Items]
Percentage of Total Portfolio	4.00%		4.00%
Structured products
Schedule of Equity Method Investments [Line Items]
Cost	$ 101,293		$ 79,722
Fair Value	$ 103,020		$ 80,401
Percentage of Total Net Assets	4.00%		4.00%
Structured products | Cost | Investment Type Concentration Risk
Schedule of Equity Method Investments [Line Items]
Percentage of Total Portfolio	2.00%		3.00%
Structured products | Fair Value | Investment Type Concentration Risk
Schedule of Equity Method Investments [Line Items]
Percentage of Total Portfolio	3.00%		3.00%
Equity shares
Schedule of Equity Method Investments [Line Items]
Cost	$ 329,693		$ 298,038
Fair Value	$ 366,880		$ 337,684
Percentage of Total Net Assets	14.00%		17.00%
Equity shares | Cost | Investment Type Concentration Risk
Schedule of Equity Method Investments [Line Items]
Percentage of Total Portfolio	7.00%		10.00%
Equity shares | Fair Value | Investment Type Concentration Risk
Schedule of Equity Method Investments [Line Items]
Percentage of Total Portfolio	8.00%		11.00%
Equity warrants
Schedule of Equity Method Investments [Line Items]
Cost	$ 4		$ 4
Fair Value	$ 1,065		$ 2,813
Percentage of Total Net Assets	0.00%		0.00%
Equity warrants | Cost | Investment Type Concentration Risk
Schedule of Equity Method Investments [Line Items]
Percentage of Total Portfolio	0.00%		0.00%
Equity warrants | Fair Value | Investment Type Concentration Risk
Schedule of Equity Method Investments [Line Items]
Percentage of Total Portfolio	0.00%		0.00%
Royalty rights
Schedule of Equity Method Investments [Line Items]
Cost	$ 3,295		$ 9,066
Fair Value	$ 3,953		$ 14,583
Percentage of Total Net Assets	0.00%		1.00%
Royalty rights | Cost | Investment Type Concentration Risk
Schedule of Equity Method Investments [Line Items]
Percentage of Total Portfolio	0.00%		0.00%
Royalty rights | Fair Value | Investment Type Concentration Risk
Schedule of Equity Method Investments [Line Items]
Percentage of Total Portfolio	0.00%		0.00%
Investment in joint ventures
Schedule of Equity Method Investments [Line Items]
Cost	$ 27,404		$ 41,986
Fair Value	$ 7,297		$ 22,480
Percentage of Total Net Assets	0.00%		1.00%
Investment in joint ventures | Cost | Investment Type Concentration Risk
Schedule of Equity Method Investments [Line Items]
Percentage of Total Portfolio	1.00%		1.00%
Investment in joint ventures | Fair Value | Investment Type Concentration Risk
Schedule of Equity Method Investments [Line Items]
Percentage of Total Portfolio	0.00%		1.00%
Short-term investments
Schedule of Equity Method Investments [Line Items]
Cost	$ 10,703		$ 10,201
Fair Value	$ 10,702		$ 10,200
Percentage of Total Net Assets	0.40%	[1]	0.50%	[2]
Short-term investments | Cost | Investment Type Concentration Risk
Schedule of Equity Method Investments [Line Items]
Percentage of Total Portfolio	0.00%		0.00%
Short-term investments | Fair Value | Investment Type Concentration Risk
Schedule of Equity Method Investments [Line Items]
Percentage of Total Portfolio	0.00%		0.00%
Federal Housing Administration (“FHA”) loans | Thompson Rivers LLC
Schedule of Equity Method Investments [Line Items]
Cost	$ 124,090		$ 193,265
Fair Value	$ 117,042		$ 179,963
Federal Housing Administration (“FHA”) loans | Cost | Investment Type Concentration Risk | Thompson Rivers LLC
Schedule of Equity Method Investments [Line Items]
Percentage of Total Portfolio	94.00%		93.00%
Federal Housing Administration (“FHA”) loans | Fair Value | Investment Type Concentration Risk | Thompson Rivers LLC
Schedule of Equity Method Investments [Line Items]
Percentage of Total Portfolio	94.00%		93.00%
Veterans Affairs (“VA”) loans | Thompson Rivers LLC
Schedule of Equity Method Investments [Line Items]
Cost	$ 8,037		$ 14,305
Fair Value	$ 7,647		$ 13,388
Veterans Affairs (“VA”) loans | Cost | Investment Type Concentration Risk | Thompson Rivers LLC
Schedule of Equity Method Investments [Line Items]
Percentage of Total Portfolio	6.00%		7.00%
Veterans Affairs (“VA”) loans | Fair Value | Investment Type Concentration Risk | Thompson Rivers LLC
Schedule of Equity Method Investments [Line Items]
Percentage of Total Portfolio	6.00%		7.00%

[1] Fair value as a percentage of net assets.

[2] Fair value as a percentage of net assets.