Segment Information - Assets (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Net sales to unaffiliated customers and identifiable assets by geographic areas
Identifiable Assets by Geographic Areas	$ 169,891	$ 165,533
USA
Net sales to unaffiliated customers and identifiable assets by geographic areas
Identifiable Assets by Geographic Areas	108,515	114,126
Canada
Net sales to unaffiliated customers and identifiable assets by geographic areas
Identifiable Assets by Geographic Areas	20,506	18,514
Europe and United Kingdom
Net sales to unaffiliated customers and identifiable assets by geographic areas
Identifiable Assets by Geographic Areas	20,537	13,301
Rest of the world
Net sales to unaffiliated customers and identifiable assets by geographic areas
Identifiable Assets by Geographic Areas	$ 20,333	$ 19,592