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Acquisition - Narrative (Details) - Huen Electric Inc [Member] - USD ($) $ in Thousands		3 Months Ended	6 Months Ended
	Jul. 02, 2018	Jun. 30, 2019	Jun. 30, 2019
Preliminary estimated net asset adjustments	$ 10,749		$ 10,834
Total consideration, net of net asset adjustments	$ 57,831		57,916
Margin Guarantee [Member]
Change in contingent consideration		$ 600	1,400
Certain Performance Targets and Continued Employment of Key Executives [Member]
Change in contingent consideration		$ 300	$ 600

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