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Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Accumulated Other Comprehensive Loss [Roll Forward]
Beginning balance		$ 260,503	$ 274,629
Other Comprehensive Income (Loss) [Abstract]
Ending balance		252,967	260,503	$ 274,629
Accumulated Other Comprehensive Loss [Member]
Accumulated Other Comprehensive Loss [Roll Forward]
Beginning balance		(2,087)	(1,465)	(2,144)
Other Comprehensive Income (Loss) [Abstract]
Ending balance		(2,560)	(2,087)	(1,465)
Defined Benefit Pension Plan [Member]
Other Comprehensive Income (Loss) [Abstract]
Other comprehensive income (loss), before tax		(632)	(860)	905
Tax expense (benefit)		(159)	(238)	226
Total other comprehensive income (loss)		(473)	(622)	679
Defined Benefit Pension Plan Net Gain (Loss) [Member]
Other Comprehensive Income (Loss) [Abstract]
Other comprehensive income (loss) before reclassifications		(791)	(906)	769
Reclassification from accumulated other comprehensive loss	[1]	$ 159	$ 46	$ 136
[1] These amounts are included in the computation of net periodic pension costs and were reclassified to selling, general and administrative costs.

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Amount before tax and reclassification adjustments of other comprehensive income (loss) attributable to parent.

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Amount before tax of other comprehensive income (loss) attributable to parent entity.

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Amount after tax of other comprehensive income (loss) attributable to parent entity.

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Amount of tax expense (benefit) allocated to 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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