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Variable Interest Entities (Narrative) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Current assets | $ 4,080,457 |  |  |  | $ 3,510,986 |  |  |  | $ 4,080,457 | $ 3,510,986 |
Current liabilities | 2,264,363 |  |  |  | 2,109,856 |  |  |  | 2,264,363 | 2,109,856 |
REVENUE | 1,349,516 | $ 1,442,091 | $ 1,276,427 | $ 1,250,729 | 1,177,725 | $ 1,189,345 | $ 1,125,275 | $ 958,487 | $ 5,318,763 | 4,450,832 | $ 4,454,662
O&G |  |  |  |  |  |  |  |  |  |  |
Ownership percentage in joint venture |  |  |  |  |  |  |  |  | 75.00% |  |
Related party ownership percentage in joint venture |  |  |  |  |  |  |  |  | 25.00% |  |
Purple Line Expansion Section 2 And Section 3 | O&G |  |  |  |  |  |  |  |  |  |  |
REVENUE |  |  |  |  |  |  |  |  | $ 2,800,000 |  |
Purple Line Segment 2 Expansion Project | O&G |  |  |  |  |  |  |  |  |  |  |
Ownership percentage in joint venture |  |  |  |  |  |  |  |  | 75.00% |  |
Related party ownership percentage in joint venture |  |  |  |  |  |  |  |  | 25.00% |  |
Parsons Corporation [Member] | Newark Liberty International Airport Terminal One Project |  |  |  |  |  |  |  |  |  |  |
Ownership percentage in joint venture |  |  |  |  |  |  |  |  | 80.00% |  |
Variable interest ownership percentage in joint venture |  |  |  |  |  |  |  |  | 20.00% |  |
Parsons Corporation [Member] | Newark Liberty International Airport Terminal One Project | Scenario, Plan |  |  |  |  |  |  |  |  |  |  |
REVENUE |  |  |  |  |  |  |  |  | $ 1,400,000 |  |
Variable Interest Entity, Not Primary Beneficiary |  |  |  |  |  |  |  |  |  |  |
Current assets | 600 |  |  |  | 1,500 |  |  |  | 600 | 1,500 |
Current liabilities | 500 |  |  |  | 1,400 |  |  |  | 500 | 1,400 |
Variable Interest Entity, Primary Beneficiary |  |  |  |  |  |  |  |  |  |  |
Current assets | 405,700 |  |  |  | 365,000 |  |  |  | 405,700 | 365,000 |
Current liabilities | 514,900 |  |  |  | 556,100 |  |  |  | 514,900 | 556,100 |
Noncurrent assets | $ 14,200 |  |  |  | $ 52,000 |  |  |  | $ 14,200 | $ 52,000 |

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