v3.26.1
Fair Value Measurements - Financial Instruments (Details) - USD ($)
$ in Thousands
Dec. 31, 2025
Dec. 31, 2024
Assets:    
Total debt securities $ 88,305 $ 105,665
Equity Securities 313 311
Short-term investments 24,725 21,151
Total marketable investments measured at fair value 113,343 127,127
Investments measured at NAV $ 964 $ 1,292
Investment, Type [Extensible Enumeration] Partnership Interest [Member] Partnership Interest [Member]
Total investments measured at fair value $ 114,307 $ 128,419
Total assets measured at fair value 118,597 136,489
Liabilities:    
Total Liabilities (non-recurring fair value measure) 21,284  
Recurring Fair Value Measure    
Liabilities:    
Funds withheld obligation 21,284  
CIS    
Assets:    
Contingent considerations from CIS sale 4,290 8,070
U.S. Government    
Assets:    
Total debt securities 4,605 4,502
State and local government    
Assets:    
Total debt securities 17,216 18,123
Corporate debt    
Assets:    
Total debt securities 23,764 30,640
Asset-backed securities    
Assets:    
Total debt securities 20,973 28,433
Mortgage-backed securities    
Assets:    
Total debt securities 18,568 19,665
Commercial mortgage-backed securities    
Assets:    
Total debt securities 1,006 1,831
Collateralized mortgage obligations    
Assets:    
Total debt securities 2,173 2,471
Level 1    
Assets:    
Total debt securities 0 0
Equity Securities 93 91
Short-term investments 22,204 21,151
Total marketable investments measured at fair value 22,297 21,242
Liabilities:    
Total Liabilities (non-recurring fair value measure) 0  
Level 1 | Recurring Fair Value Measure    
Liabilities:    
Funds withheld obligation 0  
Level 1 | CIS    
Assets:    
Contingent considerations from CIS sale 0 0
Level 1 | U.S. Government    
Assets:    
Total debt securities 0 0
Level 1 | State and local government    
Assets:    
Total debt securities 0 0
Level 1 | Corporate debt    
Assets:    
Total debt securities 0 0
Level 1 | Asset-backed securities    
Assets:    
Total debt securities 0 0
Level 1 | Mortgage-backed securities    
Assets:    
Total debt securities 0 0
Level 1 | Commercial mortgage-backed securities    
Assets:    
Total debt securities 0 0
Level 1 | Collateralized mortgage obligations    
Assets:    
Total debt securities 0 0
Level 2    
Assets:    
Total debt securities 88,305 105,665
Equity Securities 220 220
Short-term investments 2,521 0
Total marketable investments measured at fair value 91,046 105,885
Liabilities:    
Total Liabilities (non-recurring fair value measure) 21,284  
Level 2 | Recurring Fair Value Measure    
Liabilities:    
Funds withheld obligation 21,284  
Level 2 | CIS    
Assets:    
Contingent considerations from CIS sale 0 0
Level 2 | U.S. Government    
Assets:    
Total debt securities 4,605 4,502
Level 2 | State and local government    
Assets:    
Total debt securities 17,216 18,123
Level 2 | Corporate debt    
Assets:    
Total debt securities 23,764 30,640
Level 2 | Asset-backed securities    
Assets:    
Total debt securities 20,973 28,433
Level 2 | Mortgage-backed securities    
Assets:    
Total debt securities 18,568 19,665
Level 2 | Commercial mortgage-backed securities    
Assets:    
Total debt securities 1,006 1,831
Level 2 | Collateralized mortgage obligations    
Assets:    
Total debt securities 2,173 2,471
Level 3    
Assets:    
Total debt securities 0 0
Equity Securities 0 0
Short-term investments 0 0
Total marketable investments measured at fair value 0 0
Liabilities:    
Total Liabilities (non-recurring fair value measure) 0  
Level 3 | Recurring Fair Value Measure    
Liabilities:    
Funds withheld obligation 0  
Level 3 | CIS    
Assets:    
Contingent considerations from CIS sale 4,290 8,070
Level 3 | U.S. Government    
Assets:    
Total debt securities 0 0
Level 3 | State and local government    
Assets:    
Total debt securities 0 0
Level 3 | Corporate debt    
Assets:    
Total debt securities 0 0
Level 3 | Asset-backed securities    
Assets:    
Total debt securities 0 0
Level 3 | Mortgage-backed securities    
Assets:    
Total debt securities 0 0
Level 3 | Commercial mortgage-backed securities    
Assets:    
Total debt securities 0 0
Level 3 | Collateralized mortgage obligations    
Assets:    
Total debt securities $ 0 $ 0