Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Disaggregation of Revenue [Line Items]
Revenue	$ 138,297	$ 131,065	$ 259,143	$ 257,707
HBB
Disaggregation of Revenue [Line Items]
Revenue	138,297	131,065	259,143	257,707
HBB | Products
Disaggregation of Revenue [Line Items]
Revenue	136,816	129,820	256,451	255,381
HBB | Licensing
Disaggregation of Revenue [Line Items]
Revenue	$ 1,481	$ 1,245	$ 2,692	$ 2,326
Maximum
Disaggregation of Revenue [Line Items]
Warranty term			3 years
Maximum | Electric appliances
Disaggregation of Revenue [Line Items]
Warranty term			10 years
Minimum
Disaggregation of Revenue [Line Items]
Warranty term			1 year