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Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	$ 1,263,777	$ 1,047,138	$ 1,217,317	$ 990,777
Other Comprehensive Income (Loss) Before Reclassifications, net of tax	(62)	(75)	18	(306)
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss)	(26)	107	(52)	(83)
Total Other Comprehensive Income (Loss)	(88)	32	(34)	(389)
Ending balance	1,328,439	1,116,543	1,328,439	1,116,543
Pension and Other Postretirement Benefits
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	1,308	(6,727)	1,334	(6,537)
Other Comprehensive Income (Loss) Before Reclassifications, net of tax	0	0	0	0
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss)	(27)	106	(53)	(84)
Total Other Comprehensive Income (Loss)	(27)	106	(53)	(84)
Ending balance	1,281	(6,621)	1,281	(6,621)
Net Unrealized Gains (Losses) on Available-for-Sale Securities
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(339)	(218)	(419)	13
Other Comprehensive Income (Loss) Before Reclassifications, net of tax	(62)	(75)	18	(306)
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss)	1	1	1	1
Total Other Comprehensive Income (Loss)	(61)	(74)	19	(305)
Ending balance	(400)	(292)	(400)	(292)
Accumulated Other Comprehensive Income (Loss)
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	969	(6,945)	915	(6,524)
Total Other Comprehensive Income (Loss)	(88)	32	(34)	(389)
Ending balance	$ 881	$ (6,913)	$ 881	$ (6,913)

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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 of equity (deficit) attributable to parent. Excludes temporary equity and equity attributable to noncontrolling interest.

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