Industry Segments - Additional Information (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020 USD ($)	Jun. 30, 2019 USD ($)	Jun. 30, 2020 USD ($) Segment	Jun. 30, 2019 USD ($)
Segment Reporting Information [Line Items]
Number of operating segments | Segment			2
Net sales	$ 118,394	$ 134,285	$ 240,644	$ 273,400
Foreign Countries [Member]
Segment Reporting Information [Line Items]
Net sales	$ 9,200	$ 11,400	$ 18,200	$ 24,200