Changes in Accumulated Other Comprehensive Loss by Component - Rollforward (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018
Changes to accumulated other comprehensive loss by component
Balance at the beginning of the period	$ (6,049)	$ (6,572)
Other comprehensive gain (loss) before reclassifications	(3,731)	1,527
Amounts reclassified from accumulated other comprehensive loss	586	125
Pension termination	6,380
Balance at the end of the period	(2,814)	(6,049)
ASU 2018-02
Changes to accumulated other comprehensive loss by component
Impact due to adoption		(1,129)
Unrealized Net Loss on Interest Rate Swap
Changes to accumulated other comprehensive loss by component
Balance at the beginning of the period	(1,530)	(1,328)
Other comprehensive gain (loss) before reclassifications	(3,867)	327
Amounts reclassified from accumulated other comprehensive loss	374	(246)
Balance at the end of the period	(5,023)	(1,530)
Unrealized Net Loss on Interest Rate Swap \| ASU 2018-02
Changes to accumulated other comprehensive loss by component
Impact due to adoption		(283)
Other Postretirement Benefit Liability
Changes to accumulated other comprehensive loss by component
Balance at the beginning of the period	2,118	1,392
Other comprehensive gain (loss) before reclassifications	325	683
Amounts reclassified from accumulated other comprehensive loss	(234)	(158)
Balance at the end of the period	2,209	2,118
Other Postretirement Benefit Liability \| ASU 2018-02
Changes to accumulated other comprehensive loss by component
Impact due to adoption		(201)
Pension Liability
Changes to accumulated other comprehensive loss by component
Balance at the beginning of the period	(6,637)	(6,636)
Other comprehensive gain (loss) before reclassifications	(189)	517
Amounts reclassified from accumulated other comprehensive loss	446	529
Pension termination	$ 6,380
Balance at the end of the period		(6,637)
Pension Liability \| ASU 2018-02
Changes to accumulated other comprehensive loss by component
Impact due to adoption		$ (1,047)

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The amount of effect of settlement for pension plan termination under the defined benefit plan.

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No definition available.

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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 of increase (decrease) to equity or (increase) decrease to net assets, resulting from the cumulative effect adjustment of a new accounting principle applied in the period of adoption.

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

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

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