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Acquisitions (Tables) | 12 Months Ended
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Dec. 31, 2017
Business Combinations [Abstract] |
Schedule of Business Acquisitions, by Acquisition [Table Text Block] | The following table summarizes the allocation of the opening balance sheet from the date of acquisition through December 31, 2017:
(in thousands) |  | (as of acquisition date) October 28, 2016 |  | Measurement Period Adjustments |  | (adjusted acquisition amounts as of) December 31, 2017
Total consideration, net of net asset adjustments |  | $ | 11,283 |  |  | $ | — |  |  | $ | 11,283 |
Accounts receivable, net |  | $ | 20,249 |  |  | $ | — |  |  | $ | 20,249 |
Costs and estimated earnings in excess of billings on uncompleted contracts |  |  | 1,610 |  |  |  | — |  |  |  | 1,610 |
Other current assets |  |  | 8 |  |  |  | — |  |  |  | 8 |
Property and equipment |  |  | 4,108 |  |  |  | 46 |  |  |  | 4,154 |
Intangible assets |  |  | — |  |  |  | 501 |  |  |  | 501 |
Accounts payable |  |  | (10,125 | ) |  |  | — |  |  |  | (10,125 | )
Billings in excess of costs and estimated earnings on uncompleted contracts |  |  | (3,020 | ) |  |  | — |  |  |  | (3,020 | )
Other current liabilities |  |  | (2,294 | ) |  |  | — |  |  |  | (2,294 | )
Net identifiable assets |  |  | 10,536 |  |  |  | 547 |  |  |  | 11,083 |
Unallocated intangible assets |  |  | 747 |  |  |  | (747 | ) |  |  | — |
Goodwill |  | $ | — |  |  | $ | 200 |  |  | $ | 200 |

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- Definition Tabular disclosure of a material business combination completed during the period, including background, timing, and recognized assets and liabilities. This table does not include leveraged buyouts. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1486-128463 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463 + Details
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