v3.26.3
Fair Value - Fair Value Measurements, Recurring and Nonrecurring (Details) - USD ($)
$ in Thousands
Sep. 30, 2026
Dec. 31, 2025
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Equity investments at fair value $ 357,110 $ 271,034
Trading 263,896 165,443
Equity method investments 9 8
Fair Value, Measurements, Recurring    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash equivalents 40,027 105,706
Equity investments at fair value   271,034
Fair value 621,015 436,485
Derivatives - assets: 3,306 786
Derivatives - liabilities: 1,245 2,019
Fair Value, Measurements, Recurring | Forward contracts - foreign exchange    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivatives - assets: 316 433
Derivatives - liabilities: 119 55
Fair Value, Measurements, Recurring | Total Return Swap    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivatives - assets: 2,990 353
Derivatives - liabilities: 1,126 1,964
Fair Value, Measurements, Recurring | Level 1    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash equivalents 40,027 105,706
Equity investments at fair value 127,437 118,553
Fair value 127,437 118,553
Derivatives - assets: 0 0
Derivatives - liabilities: 0 0
Fair Value, Measurements, Recurring | Level 1 | Forward contracts - foreign exchange    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivatives - assets: 0 0
Derivatives - liabilities: 0 0
Fair Value, Measurements, Recurring | Level 1 | Total Return Swap    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivatives - assets: 0 0
Derivatives - liabilities: 0 0
Fair Value, Measurements, Recurring | Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash equivalents 0 0
Equity investments at fair value 121,926 80,868
Fair value 385,822 246,311
Derivatives - assets: 3,306 786
Derivatives - liabilities: 1,245 2,019
Fair Value, Measurements, Recurring | Level 2 | Forward contracts - foreign exchange    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivatives - assets: 316 433
Derivatives - liabilities: 119 55
Fair Value, Measurements, Recurring | Level 2 | Total Return Swap    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivatives - assets: 2,990 353
Derivatives - liabilities: 1,126 1,964
Fair Value, Measurements, Recurring | Level 3    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash equivalents 0 0
Equity investments at fair value 99,920 65,335
Fair value 99,920 65,335
Derivatives - assets: 0 0
Derivatives - liabilities: 0 0
Fair Value, Measurements, Recurring | Level 3 | Forward contracts - foreign exchange    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivatives - assets: 0 0
Derivatives - liabilities: 0 0
Fair Value, Measurements, Recurring | Level 3 | Total Return Swap    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivatives - assets: 0 0
Derivatives - liabilities: 0 0
Fair Value, Measurements, Recurring | Investments Measured at NAV    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash equivalents 0 0
Equity investments at fair value 7,827 6,278
Fair value 7,836 6,286
Derivatives - assets: 0 0
Derivatives - liabilities: 0 0
Fair Value, Measurements, Recurring | Investments Measured at NAV | Forward contracts - foreign exchange    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivatives - assets: 0 0
Derivatives - liabilities: 0 0
Fair Value, Measurements, Recurring | Investments Measured at NAV | Total Return Swap    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivatives - assets: 0 0
Derivatives - liabilities: 0 0
Equity securities | Fair Value, Measurements, Recurring    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Equity investments at fair value 249,498 199,559
Equity securities | Fair Value, Measurements, Recurring | Level 1    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Equity investments at fair value 127,437 118,553
Equity securities | Fair Value, Measurements, Recurring | Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Equity investments at fair value 121,926 80,868
Equity securities | Fair Value, Measurements, Recurring | Level 3    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Equity investments at fair value 0 0
Equity securities | Fair Value, Measurements, Recurring | Investments Measured at NAV    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Equity investments at fair value 135 138
Limited partnership interests | Fair Value, Measurements, Recurring    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Equity investments at fair value 107,612 71,475
Limited partnership interests | Fair Value, Measurements, Recurring | Level 1    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Equity investments at fair value 0 0
Limited partnership interests | Fair Value, Measurements, Recurring | Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Equity investments at fair value 0 0
Limited partnership interests | Fair Value, Measurements, Recurring | Level 3    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Equity investments at fair value 99,920  
Limited partnership interests | Fair Value, Measurements, Recurring | Investments Measured at NAV    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Equity investments at fair value 7,692 6,140
Fixed income | Fair Value, Measurements, Recurring    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Trading   165,443
Fixed income | Fair Value, Measurements, Recurring | Level 1    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Trading 0 0
Fixed income | Fair Value, Measurements, Recurring | Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Trading 263,896 165,443
Fixed income | Fair Value, Measurements, Recurring | Level 3    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Trading 0 0
Fixed income | Fair Value, Measurements, Recurring | Investments Measured at NAV    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Trading 0 0
Equity method investments | Fair Value, Measurements, Recurring    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Equity method investments   8
Equity method investments | Fair Value, Measurements, Recurring | Level 1    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Equity method investments 0 0
Equity method investments | Fair Value, Measurements, Recurring | Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Equity method investments 0 0
Equity method investments | Fair Value, Measurements, Recurring | Level 3    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Equity method investments 0 0
Equity method investments | Fair Value, Measurements, Recurring | Investments Measured at NAV    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Equity method investments $ 9 $ 8