Current and Long-Term Financing (Narrative) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018
Line of Credit Facility [Line Items]
Interest paid	$ 3,100,000	$ 3,100,000	$ 1,600,000
Interest capitalized	400,000	300,000	$ 200,000
Assets held as collateral	288,663,000	321,418,000		$ 352,279,000	$ 296,888,000	$ 293,258,000	$ 372,957,000	$ 319,637,000	$ 316,378,000
HBB
Line of Credit Facility [Line Items]
Line of credit facility, maximum borrowing capacity	$ 115,000,000
Line of credit facility, unused capacity, commitment fee percentage	0.25%
Dividend restriction from closing date	$ 5,000,000.0
Dividend restriction period following closing date of credit facility	30 days
Dividend restriction credit facility excess availability requirement	$ 15,000,000.0
Dividend restriction credit facility excess availability requirement as defined within the agreement	$ 25,000,000.0
HBB | Base Rate | US Dollar
Line of Credit Facility [Line Items]
Basis spread on variable rate	0.00%
HBB | Base Rate | Canadian Dollar
Line of Credit Facility [Line Items]
Basis spread on variable rate	0.00%
HBB | LIBOR Rate | US Dollar
Line of Credit Facility [Line Items]
Basis spread on variable rate	1.75%
HBB | LIBOR Rate | Canadian Dollar
Line of Credit Facility [Line Items]
Basis spread on variable rate	1.75%
Operating Segments | HBB
Line of Credit Facility [Line Items]
Assets held as collateral	$ 297,200,000
Interest Rate Swaps, Extending to January 2020 and January 2024 | HBB
Line of Credit Facility [Line Items]
Notional Amount	$ 35,000,000
Average Fixed Rate	1.50%
Delayed start interest rate swaps, Extending to January 2024 | HBB
Line of Credit Facility [Line Items]
Notional Amount	$ 10,000,000	$ 10,000,000
Average Fixed Rate	1.70%	1.70%