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Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	$ 1,047,138	$ 887,866	$ 990,777	$ 870,966
Other Comprehensive Loss Before Reclassifications, net of tax	(75)	(1)	(306)	(32)
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss)	107	102	(83)	248
Total Other Comprehensive Income (Loss)	32	101	(389)	216
Ending balance	1,116,543	915,123	1,116,543	915,123
Pension and Other Postretirement Benefits
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(6,727)	(8,566)	(6,537)	(8,716)
Other Comprehensive Loss Before Reclassifications, net of tax	0	0	0	0
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss)	106	141	(84)	291
Total Other Comprehensive Income (Loss)	106	141	(84)	291
Ending balance	(6,621)	(8,425)	(6,621)	(8,425)
Net Unrealized Gains (Losses) on Available-for-Sale Securities
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(218)	174	13	209
Other Comprehensive Loss Before Reclassifications, net of tax	(75)	(1)	(306)	(32)
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss)	1	(39)	1	(43)
Total Other Comprehensive Income (Loss)	(74)	(40)	(305)	(75)
Ending balance	(292)	134	(292)	134
Accumulated Other Comprehensive Income (Loss)
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(6,945)	(8,392)	(6,524)	(8,507)
Total Other Comprehensive Income (Loss)	32	101	(389)	216
Ending balance	$ (6,913)	$ (8,291)	$ (6,913)	$ (8,291)

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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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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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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