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Accumulated Other Comprehensive Income (Loss) (Details) $ in Thousands | 3 Months Ended
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Mar. 31, 2019 USD ($)
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |
Balance, beginning of year | $ 888,375
Change in accumulated other comprehensive income before reclassifications | 26,349
Reclassification adjustments from accumulated other comprehensive income (loss) | 818
Balance, end of period | 955,191
Net unrealized appreciation on investments |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |
Balance, beginning of year | (9,323)
Change in accumulated other comprehensive income before reclassifications | 26,349
Reclassification adjustments from accumulated other comprehensive income (loss) | (70)
Balance, end of period | 16,956
Liability for underfunded employee benefit costs |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |
Balance, beginning of year | (21,149)
Change in accumulated other comprehensive income before reclassifications | 0
Reclassification adjustments from accumulated other comprehensive income (loss) | 888
Balance, end of period | (20,261)
Total |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |
Balance, beginning of year | (30,472)
Balance, end of period | $ (3,305)

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