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Organization, Business and Basis of Presentation (Details Textual) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017
Organization Consolidation and Presentation of Financial Statements [Line Items] |  |  |  |  |
Operating Income (Loss) | $ 14,137 | $ 11,420 | $ 32,901 | $ 15,502 |
Net Income (Loss) Attributable to Parent | $ 7,957 | $ 5,145 | $ 20,436 | $ 7,575 |
Earnings Per Share, Diluted | $ 0.48 | $ 0.31 | $ 1.23 | $ 0.46 |
Revenues | $ 399,537 |  | $ 1,084,824 |  |
Bank Overdrafts | $ 9,200 |  | 9,200 |  | $ 0
Significant Change Orders Or Claims [Member] |  |  |  |  |
Organization Consolidation and Presentation of Financial Statements [Line Items] |  |  |  |  |
Revenues |  |  | $ 8,800 | $ 6,500 |
Estimate Adjustment [Member] |  |  |  |  |
Organization Consolidation and Presentation of Financial Statements [Line Items] |  |  |  |  |
Cost Estimate Revision Gross Margin Increase (Decrease) Percentage | (0.60%) | (0.90%) | (0.40%) | (0.70%) |
Operating Income (Loss) | $ (2,100) | $ (3,200) | $ (3,900) | $ (7,700) |
Net Income (Loss) Attributable to Parent | $ (1,600) | $ (1,900) | $ (2,800) | $ (4,600) |
Earnings Per Share, Diluted | $ (0.09) | $ (0.12) | $ (0.17) | $ (0.28) |

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