Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Disaggregation of Revenue [Line Items]
Revenue	$ 110,549	$ 149,508	$ 369,692	$ 407,216
HBB
Disaggregation of Revenue [Line Items]
Revenue	110,549	149,508	369,692	407,216
HBB | Products
Disaggregation of Revenue [Line Items]
Revenue	109,374	148,483	365,825	403,865
HBB | Licensing
Disaggregation of Revenue [Line Items]
Revenue	$ 1,175	$ 1,025	$ 3,867	$ 3,351
Maximum | Electric appliances
Disaggregation of Revenue [Line Items]
Warranty term			10 years
Maximum | Products
Disaggregation of Revenue [Line Items]
Warranty term			3 years
Minimum | Products
Disaggregation of Revenue [Line Items]
Warranty term			1 year