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Acquisition (Details Textual) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
	Jul. 02, 2018	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Business Combination Other Expenses On Contingent Payment		$ 2,300		$ 2,300
Business Acquisition, Transaction Costs	$ 400
Borrowing From Revolving Credit Facility				$ 47,100
Line of Credit Facility, Interest Rate During Period		2.90%	2.00%	2.90%	2.00%
Revenues		$ 399,537		$ 1,084,824
Business Combination Compensation Expense Associated On Contingent Payments		200
Huen Electric Inc [Member]
Payments to Acquire Businesses, Net of Cash Acquired	47,100
Business Combination, Contingent Consideration, Liability	$ 10,700
Revenues		37,800		37,800
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest		$ 200		$ 200

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