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Revenue (Narrative) (Details) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2018 | Mar. 31, 2017
Operating Income (Loss) | $ (925) | $ 37,017
Civil [Member] |  |
Operating Income (Loss) | 2,839 | 31,888
Revenue, Remaining Performance Obligation | 4,500,000 |
Civil [Member] | Scenario Unfavorable Adjustment [Member] |  |
Operating Income (Loss) | 17,800 |
Building [Member] |  |
Operating Income (Loss) | 6,425 | 5,242
Revenue, Remaining Performance Obligation | 2,200,000 |
Specialty Contractors [Member] |  |
Operating Income (Loss) | 7,235 | $ 14,762
Revenue, Remaining Performance Obligation | $ 1,800,000 |
Minimum [Member[ | Civil [Member] |  |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period | 3 years |
Minimum [Member[ | Building And Specialty Contractors [Member] |  |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period | 1 year |
Maximum [Member] | Civil [Member] |  |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period | 5 years |
Maximum [Member] | Building And Specialty Contractors [Member] |  |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period | 3 years |

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