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Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Deferred tax assets: |  |
Other employee benefits | $ 18,409 | $ 17,781
Allowance for management fee returned on cancelled policies | 4,647 | 3,571
Deferred revenue | 4,181 | 3,756
Unrealized losses on investments | 3,827 | 7,164
Current expected credit loss allowance | 2,966 | 2,661
Other | 4,617 | 3,709
Total deferred tax assets | 38,647 | 38,642
Deferred tax liabilities: |  |
Depreciation | 27,089 | 31,126
Pension and other postretirement benefits | 12,276 | 14,738
Prepaid expenses | 2,013 | 2,001
Other | 3,687 | 2,258
Total deferred tax liabilities | 45,065 | 50,123
Net deferred tax liability | $ (6,418) | $ (11,481)

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