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Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	$ 990,777	$ 870,966
Total Other Comprehensive (Loss) Income	(421)	115
Ending balance	1,047,138	887,867
Pension and Other Postretirement Benefits
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(6,537)	(8,716)
Other Comprehensive Loss Before Reclassifications, net of tax	0	0
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss)	(190)	150
Total Other Comprehensive (Loss) Income	(190)	150
Ending balance	(6,727)	(8,566)
Net Unrealized Gain (Losses) on Available-for-Sale Securities
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	13	209
Other Comprehensive Loss Before Reclassifications, net of tax	(231)	(32)
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss)	0	(3)
Total Other Comprehensive (Loss) Income	(231)	(35)
Ending balance	(218)	174
Accumulated Other Comprehensive Income (Loss)
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(6,524)	(8,507)
Other Comprehensive Loss Before Reclassifications, net of tax	(231)	(32)
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss)	(190)	147
Total Other Comprehensive (Loss) Income	(421)	115
Ending balance	$ (6,945)	$ (8,392)

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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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