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Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	$ 1,217,317	$ 990,777
Other Comprehensive Income (Loss) Before Reclassifications, net of tax	80	(231)
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss)	(26)	(190)
Total Other Comprehensive Income (Loss)	54	(421)
Ending balance	1,263,777	1,047,138
Pension and Other Postretirement Benefits
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	1,334	(6,537)
Other Comprehensive Income (Loss) Before Reclassifications, net of tax	0	0
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss)	(26)	(190)
Total Other Comprehensive Income (Loss)	(26)	(190)
Ending balance	1,308	(6,727)
Net Unrealized Gains (Losses) on Available-for-Sale Securities
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(419)	13
Other Comprehensive Income (Loss) Before Reclassifications, net of tax	80	(231)
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss)	0	0
Total Other Comprehensive Income (Loss)	80	(231)
Ending balance	(339)	(218)
Accumulated Other Comprehensive Income (Loss)
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	915	(6,524)
Total Other Comprehensive Income (Loss)	54	(421)
Ending balance	$ 969	$ (6,945)

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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 other comprehensive income (loss) attributable to parent entity.

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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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