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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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