Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2025	Dec. 31, 2024
Deferred tax assets:
Other employee benefits	$ 18,213	$ 18,409
Allowance for management fee returned on cancelled policies	7,322	4,647
Charitable contributions	5,221	0
Deferred revenue	4,457	4,181
Current expected credit loss allowance	3,647	2,966
Unrealized losses on investments	0	3,827
Other	4,958	4,617
Total deferred tax assets	43,818	38,647
Deferred tax liabilities:
Depreciation	47,017	27,089
Pension and other postretirement benefits	13,919	12,276
Unrealized gains on investments	2,532	0
Prepaid expenses	1,506	2,013
Other	3,632	3,687
Total deferred tax liabilities	68,606	45,065
Net deferred tax liability	$ (24,788)	$ (6,418)