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Quarterly Financial Data (Unaudited) - Narrative (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 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
Quarterly Data |  |  |  |  |  |  |  |  |
Asset impairments |  | $ 298,000 |  |  |  |  | $ 400 | $ 90,400 |
Allowance for credit loss | $ 39,000 |  | $ 35,000 |  |  |  | 39,000 | 35,000 |
Charges from project positions due to Covid-19 related schedule delays and associated cost growth |  | 52,000 |  |  |  |  |  |  |
Impairment of assets held for sale (including Disc Ops) | $ 46,000 | 100,000 |  |  |  |  | 145,700 | 0 | $ 0
Charges from resolution of close-out matters with customer |  |  |  |  |  | $ 31,000 |  |  |
Charges including settlement of client disputes and cost growth related to close-out matters |  |  |  |  | $ 109,000 | 26,000 |  |  |
Charges from write-off of pre-contract costs |  |  |  |  | 26,000 |  |  |  |
Charges from schedule-driven cost growth and client and subcontractor negotiations |  |  |  |  | 87,000 |  |  |  |
Charges from late engineering changes, schedule-driven cost growth, and negotiations with clients and subcontractors on pending change orders |  |  | 78,000 |  | 55,000 |  |  |  |
Charges for late engineering changes, cost growth and ongoing assessments of certain unapproved change orders |  |  |  | $ 21,000 | 57,000 | 4,000 |  |  |
Gains related to favorable dispute resolution |  |  |  | 18,000 | 13,000 |  |  |  |
Effect of forecast revision on estimated project cost |  |  |  | 59,000 |  |  |  |  |
Valuation allowance against deferred tax assets during the period |  |  | 185,000 | 546,000 |  |  |  |  |
Impairment, restructuring and other exit costs |  |  | 145,000 | $ 334,000 | 27,000 | 27,000 | 305,590 | 532,600 | 0
Loss on pension settlement |  |  | 138,000 |  |  |  | $ (400) | $ 137,900 | $ 21,900
Previously unrecognized service fee revenue |  |  | 89,000 |  |  |  |  |  |
Offshore Project |  |  |  |  |  |  |  |  |
Quarterly Data |  |  |  |  |  |  |  |  |
Charges from late design changes, schedule-driven cost growth including liquidated damages, and subcontractor negotiations |  |  | $ 20,000 |  | $ 179,000 | $ 61,000 |  |  |
Energy & Chemicals |  |  |  |  |  |  |  |  |
Quarterly Data |  |  |  |  |  |  |  |  |
Allowance for credit loss |  | $ 55,000 |  |  |  |  |  |  |

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