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Fair Value Measurements - Reconciliation of the beginning and ending balances for investments at fair value that use Level 3 inputs (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Reconciliation of beginning and ending balances for investments at fair value that use Level 3 inputs    
Balance at the beginning $ 2,528,144 $ 1,468,962
Purchases of investments and other adjustments to cost 368,790 104,141
Proceeds from principal payments and sales of investments (90,361) (34,777)
Reclassifications 0 0
Transfers in (out) of Level 3 (133) 0
Balance at the end $ 2,814,036 $ 1,543,858
Fair value, asset, recurring basis, still held, unrealized gain (loss), statement of income or comprehensive income [extensible enumeration] Net change in unrealized gain (loss): Net change in unrealized gain (loss):
Total net change in unrealized gain (loss) on investments attributable to Level 3 investments still held $ 3,698 $ 5,633
Net realized gain (loss) on investments    
Fair Value Measurements    
Fair value, asset, recurring basis, unobservable input reconciliation, gain (loss), statement of income or comprehensive income [extensible enumeration] Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments
Reconciliation of beginning and ending balances for investments at fair value that use Level 3 inputs    
Gains (losses) included in earnings $ 4 $ 944
Net change in unrealized gain (loss) on investments    
Fair Value Measurements    
Fair value, asset, recurring basis, unobservable input reconciliation, gain (loss), statement of income or comprehensive income [extensible enumeration] Net change in unrealized gain (loss): Net change in unrealized gain (loss):
Reconciliation of beginning and ending balances for investments at fair value that use Level 3 inputs    
Gains (losses) included in earnings $ 7,592 $ 4,588
Senior secured loans    
Reconciliation of beginning and ending balances for investments at fair value that use Level 3 inputs    
Balance at the beginning 2,171,243 1,250,788
Purchases of investments and other adjustments to cost 340,806 97,250
Proceeds from principal payments and sales of investments (75,787) (31,623)
Reclassifications (10,590) 0
Transfers in (out) of Level 3 0 0
Balance at the end 2,432,957 1,320,148
Senior secured loans | Net realized gain (loss) on investments    
Reconciliation of beginning and ending balances for investments at fair value that use Level 3 inputs    
Gains (losses) included in earnings 0 (5)
Senior secured loans | Net change in unrealized gain (loss) on investments    
Reconciliation of beginning and ending balances for investments at fair value that use Level 3 inputs    
Gains (losses) included in earnings 7,285 3,738
Unitranche secured loans    
Reconciliation of beginning and ending balances for investments at fair value that use Level 3 inputs    
Balance at the beginning 184,853 127,378
Purchases of investments and other adjustments to cost 2,438 890
Proceeds from principal payments and sales of investments (13,681) (153)
Reclassifications 0 0
Transfers in (out) of Level 3 0 0
Balance at the end 174,337 128,380
Unitranche secured loans | Net realized gain (loss) on investments    
Reconciliation of beginning and ending balances for investments at fair value that use Level 3 inputs    
Gains (losses) included in earnings 0 0
Unitranche secured loans | Net change in unrealized gain (loss) on investments    
Reconciliation of beginning and ending balances for investments at fair value that use Level 3 inputs    
Gains (losses) included in earnings 727 265
Junior secured loans    
Reconciliation of beginning and ending balances for investments at fair value that use Level 3 inputs    
Balance at the beginning 87,986 44,469
Purchases of investments and other adjustments to cost 15,059 2,119
Proceeds from principal payments and sales of investments (274) (2,039)
Reclassifications (3,662) 0
Transfers in (out) of Level 3 0 0
Balance at the end 102,443 44,633
Junior secured loans | Net realized gain (loss) on investments    
Reconciliation of beginning and ending balances for investments at fair value that use Level 3 inputs    
Gains (losses) included in earnings 0 0
Junior secured loans | Net change in unrealized gain (loss) on investments    
Reconciliation of beginning and ending balances for investments at fair value that use Level 3 inputs    
Gains (losses) included in earnings 3,334 84
Equity securities    
Reconciliation of beginning and ending balances for investments at fair value that use Level 3 inputs    
Balance at the beginning 84,062 46,327
Purchases of investments and other adjustments to cost 10,487 3,882
Proceeds from principal payments and sales of investments (619) (962)
Reclassifications 14,252 0
Transfers in (out) of Level 3 (133) 0
Balance at the end 104,299 50,697
Equity securities | Net realized gain (loss) on investments    
Reconciliation of beginning and ending balances for investments at fair value that use Level 3 inputs    
Gains (losses) included in earnings 4 949
Equity securities | Net change in unrealized gain (loss) on investments    
Reconciliation of beginning and ending balances for investments at fair value that use Level 3 inputs    
Gains (losses) included in earnings $ (3,754) $ 501