Allowance for Expected Credit Losses (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024
Allowance for Expected Credit Losses
Expected credit losses	$ 0	$ 0
CAR Commercial Automobile Program and the Taxi/Limo Program
Allowance for Expected Credit Losses
Percentage of reinsurance recoverable	95.00%	93.00%
Other Contracts
Allowance for Expected Credit Losses
Percentage of reinsurance recoverable	5.00%	7.00%