Segment Reporting and Foreign Operations - Narrative (Details) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2020 USD ($)	Sep. 30, 2020 USD ($)	Jun. 30, 2020 USD ($)	Mar. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Sep. 30, 2019 USD ($)	Jun. 30, 2019 USD ($)	Mar. 31, 2019 USD ($)	Dec. 31, 2020 USD ($) segment	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)
Segment Reporting Information [Line Items]
Number of operating segments | segment									2
Net sales	$ 258,004	$ 243,975	$ 218,371	$ 243,525	$ 257,922	$ 243,049	$ 255,532	$ 238,349	$ 963,875	$ 994,852	$ 882,753
International
Segment Reporting Information [Line Items]
Net sales									$ 413,814	$ 419,141	$ 386,340
International | Sales Revenue | Geographic Concentration
Segment Reporting Information [Line Items]
Concentration for geographic sales									43.00%	42.00%	44.00%
CHINA
Segment Reporting Information [Line Items]
Net sales									$ 113,200	$ 113,300	$ 92,700