v3.26.1
Fair Value Measurements - Financial Instruments (Details) - USD ($)
$ in Thousands
Mar. 31, 2026
Dec. 31, 2025
Assets:    
Total debt securities $ 80,314 $ 88,305
Equity Securities 311 313
Short-term investments 32,464 24,725
Total marketable investments measured at fair value 113,089 113,343
Investments measured at NAV $ 977 $ 964
Investment, Type [Extensible Enumeration] Partnership Interest [Member] Partnership Interest [Member]
Total investments measured at fair value $ 114,066 $ 114,307
Total assets measured at fair value 122,846 118,597
Liabilities:    
Total Liabilities fair value measure 20,541 21,284
Recurring Fair Value Measure    
Liabilities:    
Funds withheld obligation 20,541 21,284
CIS    
Assets:    
Contingent considerations from CIS Sale 8,780 4,290
U.S. Government    
Assets:    
Total debt securities 4,704 4,605
State and local government    
Assets:    
Total debt securities 17,200 17,216
Corporate debt    
Assets:    
Total debt securities 22,076 23,764
Asset-backed securities    
Assets:    
Total debt securities 15,124 20,973
Mortgage-backed securities    
Assets:    
Total debt securities 17,972 18,568
Commercial mortgage-backed securities    
Assets:    
Total debt securities 1,123 1,006
Collateralized mortgage obligations    
Assets:    
Total debt securities 2,115 2,173
Level 1    
Assets:    
Total debt securities 0 0
Equity Securities 91 93
Short-term investments 32,464 22,204
Total marketable investments measured at fair value 32,555 22,297
Liabilities:    
Total Liabilities fair value measure 0 0
Level 1 | Recurring Fair Value Measure    
Liabilities:    
Funds withheld obligation 0 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 80,314 88,305
Equity Securities 220 220
Short-term investments 0 2,521
Total marketable investments measured at fair value 80,534 91,046
Liabilities:    
Total Liabilities fair value measure 20,541 21,284
Level 2 | Recurring Fair Value Measure    
Liabilities:    
Funds withheld obligation 20,541 21,284
Level 2 | CIS    
Assets:    
Contingent considerations from CIS Sale 0 0
Level 2 | U.S. Government    
Assets:    
Total debt securities 4,704 4,605
Level 2 | State and local government    
Assets:    
Total debt securities 17,200 17,216
Level 2 | Corporate debt    
Assets:    
Total debt securities 22,076 23,764
Level 2 | Asset-backed securities    
Assets:    
Total debt securities 15,124 20,973
Level 2 | Mortgage-backed securities    
Assets:    
Total debt securities 17,972 18,568
Level 2 | Commercial mortgage-backed securities    
Assets:    
Total debt securities 1,123 1,006
Level 2 | Collateralized mortgage obligations    
Assets:    
Total debt securities 2,115 2,173
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 fair value measure 0 0
Level 3 | Recurring Fair Value Measure    
Liabilities:    
Funds withheld obligation 0 0
Level 3 | CIS    
Assets:    
Contingent considerations from CIS Sale 8,780 4,290
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