Industry Segments - Additional Information (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020 USD ($)	Sep. 30, 2019 USD ($)	Sep. 30, 2020 USD ($) Segment	Sep. 30, 2019 USD ($)
Segment Reporting Information [Line Items]
Number of operating segments | Segment			2
Net sales	$ 132,258	$ 125,480	$ 372,902	$ 398,880
Foreign Countries [Member]
Segment Reporting Information [Line Items]
Net sales	$ 9,800	$ 8,600	$ 28,000	$ 32,800