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Variable Interest Entities (Narrative) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Assets, Current | $ 3,175,643 |  |  |  | $ 3,074,392 |  |  |  | $ 3,175,643 | $ 3,074,392 |
Liabilities, Current | 1,597,966 |  |  |  | 1,581,846 |  |  |  | 1,597,966 | 1,581,846 |
REVENUE | 1,183,284 | $ 1,123,137 | $ 1,120,085 | $ 1,028,156 | 1,193,068 | $ 1,199,505 | $ 1,247,274 | $ 1,117,361 | $ 4,454,662 | 4,757,208 | $ 4,973,076
O&G [Member] |  |  |  |  |  |  |  |  |  |  |
Ownership percentage in joint venture |  |  |  |  |  |  |  |  | 75.00% |  |
Related party's ownership percentage in joint venture |  |  |  |  |  |  |  |  | 25.00% |  |
Purple Line Segment 2 Expansion Project [Member] | O&G [Member] |  |  |  |  |  |  |  |  |  |  |
Ownership percentage in joint venture |  |  |  |  |  |  |  |  | 75.00% |  |
Related party's ownership percentage in joint venture |  |  |  |  |  |  |  |  | 25.00% |  |
Purple Line Segment 2 Expansion Project [Member] | O&G [Member] | Scenario, Plan [Member] |  |  |  |  |  |  |  |  |  |  |
REVENUE |  |  |  |  |  |  |  |  | $ 1,400,000 |  |
Parsons Corporation [Member] | Newark Liberty International Airport Terminal One Project [Member] |  |  |  |  |  |  |  |  |  |  |
Ownership percentage in joint venture |  |  |  |  |  |  |  |  | 80.00% |  |
Variable Interest Entity's Ownership Percentage In Joint Venture |  |  |  |  |  |  |  |  | 20.00% |  |
Parsons Corporation [Member] | Newark Liberty International Airport Terminal One Project [Member] | Scenario, Plan [Member] |  |  |  |  |  |  |  |  |  |  |
REVENUE |  |  |  |  |  |  |  |  | $ 1,400,000 |  |
Variable Interest Entity, Not Primary Beneficiary [Member] |  |  |  |  |  |  |  |  |  |  |
Assets, Current | 4,000 |  |  |  | 800 |  |  |  | 4,000 | 800 |
Liabilities, Current | 3,800 |  |  |  | 800 |  |  |  | 3,800 | 800 |
Variable Interest Entity, Primary Beneficiary [Member] |  |  |  |  |  |  |  |  |  |  |
Assets, Current | 173,900 |  |  |  | 95,500 |  |  |  | 173,900 | 95,500 |
Assets, Noncurrent | 51,500 |  |  |  | 11,600 |  |  |  | 51,500 | 11,600 |
Liabilities, Current | $ 319,900 |  |  |  | $ 140,700 |  |  |  | $ 319,900 | $ 140,700 |

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