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Accumulated Other Comprehensive Income (Loss) (Details) $ in Thousands	3 Months Ended
	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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Amount after tax, before reclassification adjustments, of other comprehensive income (loss), attributable to parent.

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Amount after tax of reclassification adjustments of other comprehensive income (loss) attributable to parent.

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Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity.

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