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Fair Value Measurements - Level III Rollforward (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022 | Dec. 31, 2022 | Dec. 31, 2021
Fair Value Measurements |  |  |  |  |  |
Fair value, beginning of period | $ 2,924,839 | $ 2,642,354 | $ 2,828,035 | $ 2,356,559 | $ 2,356,559 | $ 614,432
Purchases of investments | 154,948 | 180,286 | 367,712 | 730,414 | 924,749 | 2,083,855
Proceeds from principal repayments and sales of investments | (41,712) | (94,355) | (168,477) | (331,125) | (384,679) | (364,773)
Accretion of discount/amortization of premium | 2,105 | 3,570 | 7,192 | 8,855 | 11,341 | 9,839
Payment-in-kind | 1,478 | 358 | 3,539 | 1,451 | 2,714 | 1,179
Transfers into/(out) of Level 3 | (21,675) | (20,083) | (32,383) | (17,500) | (5,950) | 2,849
Fair value, end of period | 3,040,160 | 2,689,063 | 3,040,160 | 2,689,063 | 2,828,035 | 2,356,559
Net change in unrealized appreciation (depreciation) from investments still held |  |  |  |  | (75,007) | 9,037
Net change in unrealized appreciation (depreciation) |  |  |  |  |  |
Fair Value Measurements |  |  |  |  |  |
Total gains or losses included in earnings | 20,172 | (23,085) | 34,415 | (60,153) |  |
Total gains or losses included in earnings |  |  |  |  | (77,242) | 7,283
Net realized gains (losses) |  |  |  |  |  |
Fair Value Measurements |  |  |  |  |  |
Total gains or losses included in earnings | 5 | 18 | 127 | 562 |  |
Total gains or losses included in earnings |  |  |  |  | 543 | 1,895
First Lien Debt |  |  |  |  |  |
Fair Value Measurements |  |  |  |  |  |
Fair value, beginning of period | 2,772,653 | 2,492,968 | 2,668,749 | 2,207,036 | 2,207,036 | 558,318
Purchases of investments | 153,327 | 178,809 | 365,914 | 709,912 | 900,740 | 1,956,780
Proceeds from principal repayments and sales of investments | (41,712) | (94,355) | (168,477) | (331,077) | (384,631) | (325,175)
Accretion of discount/amortization of premium | 2,035 | 3,520 | 6,985 | 8,645 | 11,062 | 8,831
Payment-in-kind | 774 | 228 | 1,580 | 665 | 1,080 | 133
Transfers into/(out) of Level 3 | 0 | (20,083) | 0 | 0 |  | 2,849
Fair value, end of period | 2,907,989 | 2,542,916 | 2,907,989 | 2,542,916 | 2,668,749 | 2,207,036
Net change in unrealized appreciation (depreciation) from investments still held |  |  |  |  | (64,817) | 6,807
First Lien Debt | Net change in unrealized appreciation (depreciation) |  |  |  |  |  |
Fair Value Measurements |  |  |  |  |  |
Total gains or losses included in earnings | 20,907 | (18,171) | 33,111 | (52,779) |  |
Total gains or losses included in earnings |  |  |  |  | (67,033) | 5,052
First Lien Debt | Net realized gains (losses) |  |  |  |  |  |
Fair Value Measurements |  |  |  |  |  |
Total gains or losses included in earnings | 5 | 0 | 127 | 514 |  |
Total gains or losses included in earnings |  |  |  |  | 495 | 248
Second Lien Debt |  |  |  |  |  |
Fair Value Measurements |  |  |  |  |  |
Fair value, beginning of period | 113,084 | 116,488 | 122,891 | 121,550 | 121,550 | 53,155
Purchases of investments | 0 | 461 | 86 | 15,694 | 15,694 | 101,352
Proceeds from principal repayments and sales of investments | 0 | 0 | 0 | 0 |  | (36,250)
Accretion of discount/amortization of premium | 68 | 50 | 201 | 210 | 278 | 1,008
Payment-in-kind | 137 | 130 | 397 | 389 | 524 | 509
Transfers into/(out) of Level 3 | (21,675) | 0 | (32,383) | (17,500) | (5,950) |
Fair value, end of period | 92,008 | 113,802 | 92,008 | 113,802 | 122,891 | 121,550
Net change in unrealized appreciation (depreciation) from investments still held |  |  |  |  | (9,186) | 1,775
Second Lien Debt | Net change in unrealized appreciation (depreciation) |  |  |  |  |  |
Fair Value Measurements |  |  |  |  |  |
Total gains or losses included in earnings | 394 | (3,345) | 816 | (6,541) |  |
Total gains or losses included in earnings |  |  |  |  | (9,205) | 1,776
Second Lien Debt | Net realized gains (losses) |  |  |  |  |  |
Fair Value Measurements |  |  |  |  |  |
Total gains or losses included in earnings | 0 | 18 | 0 | 0 |  |
Other Securities |  |  |  |  |  |
Fair Value Measurements |  |  |  |  |  |
Fair value, beginning of period | 39,102 | 32,898 | 36,395 | 27,973 | 27,973 | 2,959
Purchases of investments | 1,621 | 1,016 | 1,712 | 4,808 | 8,315 | 25,723
Proceeds from principal repayments and sales of investments | 0 | 0 | 0 | (48) | (48) | (3,348)
Accretion of discount/amortization of premium | 2 | 0 | 6 | 0 | 1 |
Payment-in-kind | 567 | 0 | 1,562 | 397 | 1,110 | 537
Transfers into/(out) of Level 3 | 0 | 0 | 0 | 0 |  |
Fair value, end of period | 40,163 | 32,345 | 40,163 | 32,345 | 36,395 | 27,973
Net change in unrealized appreciation (depreciation) from investments still held |  |  |  |  | (1,004) | 455
Other Securities | Net change in unrealized appreciation (depreciation) |  |  |  |  |  |
Fair Value Measurements |  |  |  |  |  |
Total gains or losses included in earnings | (1,129) | (1,569) | 488 | (833) |  |
Total gains or losses included in earnings |  |  |  |  | (1,004) | 455
Other Securities | Net realized gains (losses) |  |  |  |  |  |
Fair Value Measurements |  |  |  |  |  |
Total gains or losses included in earnings | $ 0 | $ 0 | $ 0 | $ 48 |  |
Total gains or losses included in earnings |  |  |  |  | $ 48 | $ 1,647

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