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Fair Value Measurements - Summary of Changes in Fair Value of Investments Measured Using Level 3 Inputs (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Investments        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Fair value, beginning of period $ 40,101,348 $ 35,002,909 $ 39,746,981 $ 24,598,152
Purchases of investments 1,834,735 6,053,461 3,354,462 16,830,559
Proceeds from principal repayments and sales of investments (794,634) (2,780,076) (1,870,249) (3,418,044)
Accretion of discount/(amortization of premium) 38,399 40,206 112,688 90,010
Transfers into Level 3 67,342 304,578 210,844 544,781
Transfers out of Level 3 (231,342) (428,074) (448,240) (284,567)
Fair value, end of period 41,086,163 37,895,208 41,086,163 37,895,208
Net change in unrealized appreciation (depreciation) included in earnings related to financial instruments, included in net unrealized appreciation (depreciation) on the Consolidated Statements of Operations 65,127 (284,436) 14,457 (450,832)
Investments, Realized Gain (Loss)        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Net realized gain (loss) (64,214) (13,964) (80,282) (12,228)
Investments, Unrealized Gain (Loss)        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Net realized gain (loss) 134,529 (283,832) 59,959 (453,453)
First lien debt        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Fair value, beginning of period 37,923,857 32,556,391 37,543,544 23,046,509
Purchases of investments 1,780,577 5,978,812 3,285,859 15,919,276
Proceeds from principal repayments and sales of investments (749,646) (2,597,994) (1,824,434) (3,204,195)
Accretion of discount/(amortization of premium) 37,541 39,220 110,256 87,705
Transfers into Level 3 44,592 193,055 187,985 380,165
Transfers out of Level 3 (160,904) (267,097) (293,756) (230,697)
Fair value, end of period 38,898,776 35,623,823 38,898,776 35,623,823
Net change in unrealized appreciation (depreciation) included in earnings related to financial instruments, included in net unrealized appreciation (depreciation) on the Consolidated Statements of Operations 22,180 (267,815) (70,835) (364,088)
Debt Securities, First Lien, Realized Gain (Loss)        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Net realized gain (loss) (63,957) (11,758) (80,718) (10,188)
Debt Securities, First Lien, Unrealized Gain (Loss)        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Net realized gain (loss) 86,716 (266,806) (29,960) (364,753)
Second lien debt        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Fair value, beginning of period 1,091,126 1,446,075 1,152,723 800,133
Purchases of investments 38,382 71,844 52,416 595,997
Proceeds from principal repayments and sales of investments (35,588) (182,082) (35,588) (182,080)
Accretion of discount/(amortization of premium) 804 933 2,273 2,191
Transfers into Level 3 22,750 111,523 22,859 164,614
Transfers out of Level 3 (70,438) (160,977) (154,484) (53,871)
Fair value, end of period 1,058,842 1,268,919 1,058,842 1,268,919
Net change in unrealized appreciation (depreciation) included in earnings related to financial instruments, included in net unrealized appreciation (depreciation) on the Consolidated Statements of Operations 7,189 (16,191) 14,924 (53,924)
Debt Securities, Second Lien, Realized Gain (Loss)        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Net realized gain (loss) 32 (2,206) 59 (2,184)
Debt Securities, Second Lien, Unrealized Gain (Loss)        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Net realized gain (loss) 11,774 (16,191) 18,584 (55,881)
Structured Finance Investments        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Fair value, beginning of period 303,838 298,409 293,335 205,592
Purchases of investments 13,606 0 13,606 122,159
Proceeds from principal repayments and sales of investments (9,400) 0 (9,400) 0
Accretion of discount/(amortization of premium) 54 52 159 114
Transfers into Level 3 0 0 0 0
Transfers out of Level 3 0 0 0 0
Fair value, end of period 321,468 287,898 321,468 287,898
Net change in unrealized appreciation (depreciation) included in earnings related to financial instruments, included in net unrealized appreciation (depreciation) on the Consolidated Statements of Operations 13,377 (10,159) 23,091 (39,967)
Structured Finance, Realized Gain (Loss)        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Net realized gain (loss) (289) 0 (289) 0
Structured Finance, Unrealized Gain (Loss)        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Net realized gain (loss) 13,659 (10,563) 24,057 (39,968)
Equity        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Fair value, beginning of period 782,527 702,034 757,379 545,918
Purchases of investments 2,170 2,805 2,581 193,127
Proceeds from principal repayments and sales of investments 0 0 (827) (31,769)
Accretion of discount/(amortization of premium) 0 0 0 0
Transfers into Level 3 0 0 0 0
Transfers out of Level 3 0 0 0 0
Fair value, end of period 807,077 714,568 807,077 714,568
Net change in unrealized appreciation (depreciation) included in earnings related to financial instruments, included in net unrealized appreciation (depreciation) on the Consolidated Statements of Operations 22,381 9,729 47,277 7,147
Equity Securities, Realized Gain (Loss)        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Net realized gain (loss) 0 0 666 144
Equity Securities, Unrealized Gain (Loss)        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Net realized gain (loss) $ 22,380 $ 9,728 $ 47,278 $ 7,148