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Business Combination - Pro Forma Financial Information (Details) - Residential Control Systems, Inc - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Business Combination
Net sales	$ 182,717	$ 175,652	$ 509,938	$ 515,200
Net income	$ 959	$ 1,751	$ 23,031	$ 6,292
Basic earnings per share (in dollars per share)	$ 0.07	$ 0.12	$ 1.65	$ 0.44
Diluted earnings per share (in dollars per share)	$ 0.07	$ 0.12	$ 1.63	$ 0.43

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The pro forma basic net income per share for a period as if the business combination or combinations had been completed at the beginning of a period.

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The pro forma diluted net income per share for a period as if the business combination or combinations had been completed at the beginning of a period.

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