Revenues (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Disaggregation of Revenue [Line Items]
Net sales	$ 84,400	$ 114,813	[1]
Remaining performance obligation	1,000
Change In Contract With Customer Liability [Roll Forward]
Balance, beginning of period	816	1,084
Cash additions	161	689
Revenue recognition	(498)	(1,080)
Balance, end of period	479	693
United States
Disaggregation of Revenue [Line Items]
Net sales	70,188	103,590
Canada
Disaggregation of Revenue [Line Items]
Net sales	7,929	5,783
All other
Disaggregation of Revenue [Line Items]
Net sales	6,283	5,440
Product sales
Disaggregation of Revenue [Line Items]
Net sales	80,132	109,750
Extended warranties and services
Disaggregation of Revenue [Line Items]
Net sales	2,469	3,482
Other
Disaggregation of Revenue [Line Items]
Net sales	1,799	$ 1,581
Retail Orders
Disaggregation of Revenue [Line Items]
Remaining performance obligation	900
Direct Orders
Disaggregation of Revenue [Line Items]
Remaining performance obligation	$ 100

[1] May not add due to rounding.