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Revenue (Narrative) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Operating Income (Loss) | $ 54,815 | $ 34,045 | $ 53,890 | $ 71,062
Civil [Member] |  |  |  |
Operating Income (Loss) | 49,439 | 58,144 | 52,278 | 90,032
Revenue, Remaining Performance Obligation | 4,300,000 |  | 4,300,000 |
Civil [Member] | Scenario Unfavorable Adjustment [Member] |  |  |  |
Operating Income (Loss) |  |  | 17,800 |
Building [Member] |  |  |  |
Operating Income (Loss) | 12,536 | 5,736 | 18,961 | 10,977
Revenue, Remaining Performance Obligation | 2,000,000 |  | 2,000,000 |
Specialty Contractors [Member] |  |  |  |
Operating Income (Loss) | 7,454 | $ (14,007) | 14,689 | $ 755
Revenue, Remaining Performance Obligation | $ 1,600,000 |  | $ 1,600,000 |
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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