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Income Taxes - Components of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Deferred tax assets |  |
Unearned premium reserve reduction | $ 12,103 | $ 12,112
Compensation accruals | 8,866 | 6,866
Reinsurance commissions | 6,804 |
Impaired securities | 1,245 | 1,295
Other comprehensive income - net funded status of benefit plans | 2,875 | 3,254
Discounting of unpaid claims and claim expense tax reserves | 2,530 | 2,772
Postretirement benefits other than pensions | 285 | 302
Charitable contributions carryforwards | 0 | 89
Net operating loss carryforwards | 3,803 | 10,969
Total gross deferred tax assets | 38,511 | 37,659
Deferred tax liabilities |  |
Other comprehensive income - net unrealized gains on securities | 74,645 | 32,897
Deferred policy acquisition costs | 49,326 | 60,330
Life insurance future policy benefit reserve | 38,210 | 9,304
Life insurance future policy benefit reserve (transitional rule) | 12,786 | 14,910
Discounting of unpaid claims and claim expense tax reserves (transitional rule) | 947 | 1,203
Investment related adjustments | 15,718 | 17,531
Intangibles | 2,021 | 2,557
Other, net | 5,482 | 2,613
Total gross deferred tax liabilities | 199,135 | 141,345
Net deferred tax liability | $ 160,624 | $ 103,686

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