Goodwill and Intangible Assets - Narrative (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Finite lived Intangible Assets Net Amortization Expense Fiscal Year Maturity [Line Items]
Amortization of Intangible Assets	$ 1,843	$ 499	$ 886
Huen Electric Inc [Member]
Finite lived Intangible Assets Net Amortization Expense Fiscal Year Maturity [Line Items]
Goodwill, Period Increase (Decrease)	$ 9,600
Huen Electric Inc [Member] | Maximum [Member]
Finite lived Intangible Assets Net Amortization Expense Fiscal Year Maturity [Line Items]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	12 years
Trade Names [Member]
Finite lived Intangible Assets Net Amortization Expense Fiscal Year Maturity [Line Items]
Estimated useful life	15 years
Customer Relationships and Backlog [Member]
Finite lived Intangible Assets Net Amortization Expense Fiscal Year Maturity [Line Items]
Estimated useful life	12 years