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Organization, Business and Basis of Presentation (Details Textual) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Organization Consolidation and Presentation of Financial Statements [Line Items] |  |  |  |
Operating Income (Loss) | $ 10,357 | $ 3,602 | $ 18,764 | $ 4,082
Net Income (Loss) Attributable to Parent | $ 6,835 | $ 1,230 | $ 12,479 | $ 2,430
Earnings Per Share, Diluted | $ 0.41 | $ 0.07 | $ 0.75 | $ 0.15
Revenues | $ 339,676 |  | $ 685,287 |
Foreign Currency Transaction Gain (Loss) |  |  |  | $ 100
Significant Change Orders Or Claims [Member] |  |  |  |
Organization Consolidation and Presentation of Financial Statements [Line Items] |  |  |  |
Revenues |  |  | $ 6,700 | $ 5,200
Estimate Adjustment [Member] |  |  |  |
Organization Consolidation and Presentation of Financial Statements [Line Items] |  |  |  |
Cost Estimate Revision Gross Margin Increase (Decrease) Percentage | 0.10% | (2.10%) | 0.10% | (1.00%)
Operating Income (Loss) | $ 200 | $ (7,400) | $ 100 | $ (6,800)
Net Income (Loss) Attributable to Parent | $ 200 | $ (4,400) | $ 100 | $ (4,100)
Earnings Per Share, Diluted | $ 0.01 | $ (0.27) |  | $ (0.25)

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