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Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2021 | Mar. 31, 2020
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |
Balance, beginning | $ 825,149 | $ 910,472
Change in accumulated other comprehensive income before reclassifications | (18,954) | 4,404
Reclassification adjustments from accumulated other comprehensive income (loss) | 1,954 | 943
Balance, ending | 823,599 | 833,144
Net unrealized appreciation on investments |  |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |
Balance, beginning | 83,070 |
Change in accumulated other comprehensive income before reclassifications | (24,093) |
Reclassification adjustments from accumulated other comprehensive income (loss) | 637 |
Balance, ending | 59,614 |
Liability for underfunded employee benefit costs |  |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |
Balance, beginning | (16,159) |
Change in accumulated other comprehensive income before reclassifications | 5,139 |
Reclassification adjustments from accumulated other comprehensive income (loss) | 1,317 |
Balance, ending | (9,703) |
Total |  |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |
Balance, beginning | 66,911 | 13,152
Balance, ending | $ 49,911 | $ 18,499

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