Revenue (Details) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2020	Mar. 31, 2019
Disaggregation of Revenue [Line Items]
Revenue	$ 120,846	$ 126,642
HBB
Disaggregation of Revenue [Line Items]
Revenue	120,846	126,642
HBB \| Products
Disaggregation of Revenue [Line Items]
Revenue	119,635	125,611
HBB \| Licensing
Disaggregation of Revenue [Line Items]
Revenue	$ 1,211	$ 1,031
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

Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130543-203045

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130545-203045

Name:	us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration