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Income Taxes - Components of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Deferred tax assets |  |
Unearned premium reserve reduction | $ 12,112 | $ 11,472
Compensation accruals | 6,866 | 8,359
Impaired securities | 1,295 | 2,240
Other comprehensive income - net funded status of benefit plans | 3,254 | 3,526
Discounting of unpaid claims and claim expense tax reserves | 2,772 | 3,889
Postretirement benefits other than pensions | 302 | 321
Charitable contributions carryforwards | 89 | 62
Net operating loss carryforwards | 10,969 | 148
Total gross deferred tax assets | 37,659 | 30,017
Deferred tax liabilities |  |
Other comprehensive income - net unrealized gains on securities | 32,897 | 95,583
Deferred policy acquisition costs | 60,330 | 52,438
Life insurance future policy benefit reserve | 9,304 | 102
Life insurance future policy benefit reserve (transitional rule) | 14,910 | 23,869
Discounting of unpaid claims and claim expense tax reserves (transitional rule) | 1,203 | 2,513
Investment related adjustments | 17,531 | 8,661
Intangibles | 2,557 | 2,557
Other, net | 2,613 | 2,069
Total gross deferred tax liabilities | 141,345 | 187,792
Net deferred tax liability | $ 103,686 | $ 157,775

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