Business Combinations (Details) $ / shares in Units, $ in Thousands		12 Months Ended
	Apr. 06, 2017 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($) $ / shares
Business Acquisition [Line Items]
Cash paid		$ 0	$ 0	$ 8,894
Long-term contingent consideration		4,349	8,435
Residential Control Systems
Business Acquisition [Line Items]
Purchase price	$ 12,600
Cash paid	8,900
Contingent consideration	3,700
Acquisition costs				100
Net sales		3,900	5,100	3,500
Net losses		2,400	200	400
Additional earnout payments	$ 10,000	500
Long-term contingent consideration		$ 200	$ 700
Pro forma net sales				696,400
Pro forma net income (loss)				$ (10,500)
Basic earnings (loss) per share (in dollars per share) | $ / shares				$ (0.73)
Diluted earnings (loss) per share (in dollars per share) | $ / shares				$ (0.73)
Increase (decrease) in amortization expense, net				$ 25
Residential Control Systems | Discount Rate | Income Valuation Approach
Business Acquisition [Line Items]
Measurement input	0.248