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Discontinued Operations - Earnings From Discontinued Operations (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
Net earnings (loss) from Disc Ops | $ (141,147) | $ 3,603 | $ 20,435
Discontinued Operations |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
Revenue | 215,684 | 260,276 | 253,130
Cost of revenue | 193,583 | 277,420 | 222,139
Corporate general and administrative expense | 13,432 | (20,913) | 5,074
Impairment of assets held for sale | 145,700 | 0 | 0
Interest expense (income), net | 159 | (341) | (354)
Total cost and expenses | 352,874 | 256,166 | 226,859
Earnings (loss) before taxes from Disc Ops | (137,190) | 4,110 | 26,271
Income tax expense (benefit) | 3,957 | 507 | 5,836
Net earnings (loss) from Disc Ops | (141,147) | 3,603 | 20,435
Discontinued Operations | Other |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
Revenue | 0 | 0 | 0
Cost of revenue | 0 | 0 | 0
Corporate general and administrative expense | 13,198 | (21,152) | 4,792
Impairment of assets held for sale | 0 | 0 | 0
Interest expense (income), net | 0 | 0 | 0
Total cost and expenses | 13,198 | (21,152) | 4,792
Earnings (loss) before taxes from Disc Ops | (13,198) | 21,152 | (4,792)
Income tax expense (benefit) | 0 | 4,447 | (1,064)
Net earnings (loss) from Disc Ops | (13,198) | 16,705 | (3,728)
Discontinued Operations | AMECO |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
Revenue | 215,684 | 260,276 | 253,130
Cost of revenue | 193,583 | 277,420 | 222,139
Corporate general and administrative expense | 234 | 239 | 282
Impairment of assets held for sale | 145,700 | 0 | 0
Interest expense (income), net | 159 | (341) | (354)
Total cost and expenses | 339,676 | 277,318 | 222,067
Earnings (loss) before taxes from Disc Ops | (123,992) | (17,042) | 31,063
Income tax expense (benefit) | 3,957 | (3,940) | 6,900
Net earnings (loss) from Disc Ops | $ (127,949) | $ (13,102) | $ 24,163

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