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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