Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2020	Mar. 31, 2019
Accumulated Other Comprehensive Loss [Roll Forward]
Beginning balance	$ (98,989)	$ (95,397)
Other comprehensive income before reclassifications	0	0
Amounts reclassified from AOCI, net of tax	(908)	(460)
Net current-period other comprehensive income	908	460
Ending balance	(98,081)	(94,937)
Defined Benefit Pension Items
Accumulated Other Comprehensive Loss [Roll Forward]
Beginning balance	(98,734)	(95,365)
Other comprehensive income before reclassifications	0	0
Amounts reclassified from AOCI, net of tax	(902)	(460)
Net current-period other comprehensive income	902	460
Ending balance	(97,832)	(94,905)
Actuarial gain (loss) tax amount	286	155
Other Comprehensive Income (Loss), Other Category
Accumulated Other Comprehensive Loss [Roll Forward]
Beginning balance	(255)	(32)
Other comprehensive income before reclassifications	0	0
Amounts reclassified from AOCI, net of tax	(6)	0
Net current-period other comprehensive income	6	0
Ending balance	$ (249)	$ (32)

Accumulated Other Comprehensive Income (Loss) [Roll Forward]

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Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge.

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Amount after tax, before reclassification adjustments of other comprehensive income (loss).

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Amount after tax and reclassification adjustments of other comprehensive income (loss).

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Amount of tax expense (benefit) of reclassification adjustment from accumulated other comprehensive income (loss).

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