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Acquisitions (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016 | Oct. 28, 2016
--- | --- | --- | ---
Business Acquisition [Line Items] |  |  |
Goodwill | $ 46,994 | $ 46,781 |
Western Pacific Enterprises [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Total consideration, net of net asset adjustments |  |  | $ 11,283
Accounts receivable, net |  |  | 20,249
Costs and estimated earnings in excess of billings on uncompleted contracts |  |  | 1,610
Other current assets |  |  | 8
Property and equipment |  |  | 4,108
Intangible assets |  |  | 0
Accounts payable |  |  | (10,125)
Billings in excess of costs and estimated earnings on uncompleted contracts |  |  | (3,020)
Other current liabilities |  |  | (2,294)
Net identifiable assets |  |  | 10,536
Unallocated intangible assets |  |  | 747
Goodwill |  |  | $ 0
Scenario, Previously Reported [Member] | Western Pacific Enterprises [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Total consideration, net of net asset adjustments | 0 |  |
Accounts receivable, net | 0 |  |
Costs and estimated earnings in excess of billings on uncompleted contracts | 0 |  |
Other current assets | 0 |  |
Property and equipment | 46 |  |
Intangible assets | 501 |  |
Accounts payable | 0 |  |
Billings in excess of costs and estimated earnings on uncompleted contracts | 0 |  |
Other current liabilities | 0 |  |
Net identifiable assets | 547 |  |
Unallocated intangible assets | (747) |  |
Goodwill | 200 |  |
Restatement Adjustment [Member] | Western Pacific Enterprises [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Total consideration, net of net asset adjustments | 11,283 |  |
Accounts receivable, net | 20,249 |  |
Costs and estimated earnings in excess of billings on uncompleted contracts | 1,610 |  |
Other current assets | 8 |  |
Property and equipment | 4,154 |  |
Intangible assets | 501 |  |
Accounts payable | (10,125) |  |
Billings in excess of costs and estimated earnings on uncompleted contracts | (3,020) |  |
Other current liabilities | (2,294) |  |
Net identifiable assets | 11,083 |  |
Unallocated intangible assets | 0 |  |
Goodwill | $ 200 |  |

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