Revenues (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Disaggregation of Revenue [Line Items]
Net sales	$ 93,722	$ 84,400
Remaining performance obligation	13,800
Change In Contract With Customer Liability [Roll Forward]
Balance, beginning of period	1,225	816
Cash additions	2,099	161
Revenue recognition	(1,274)	(498)
Balance, end of period	2,050	479
United States
Disaggregation of Revenue [Line Items]
Net sales	79,950	70,188
Canada
Disaggregation of Revenue [Line Items]
Net sales	6,249	7,929
All other
Disaggregation of Revenue [Line Items]
Net sales	7,523	6,283
Product sales
Disaggregation of Revenue [Line Items]
Net sales	89,882	80,132
Extended warranties and services
Disaggregation of Revenue [Line Items]
Net sales	1,935	2,469
Other
Disaggregation of Revenue [Line Items]
Net sales	1,905	$ 1,799
Retail Orders
Disaggregation of Revenue [Line Items]
Remaining performance obligation	5,800
Direct Orders
Disaggregation of Revenue [Line Items]
Remaining performance obligation	$ 8,000