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Discontinued Operations - Financial Information of Discontinued Operations (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]    
Impairment of assets held for sale $ 100,000 $ 0
Discontinued Operations    
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]    
Revenue 60,538 61,786
Cost of revenue 48,269 60,621
Corporate general and administrative expense 5,717 2,094
Impairment of assets held for sale 100,000 0
Interest expense (income), net (50) (76)
Total cost and expenses 153,936 62,639
Earnings (loss) before taxes from discontinued operations (93,398) (853)
Income tax expense (benefit) 1,457 (39)
Net earnings (loss) from discontinued operations (94,855) (814)
Discontinued Operations | AMECO    
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]    
Revenue 60,538 61,786
Cost of revenue 48,269 60,621
Corporate general and administrative expense 14 79
Impairment of assets held for sale 100,000 0
Interest expense (income), net (50) (76)
Total cost and expenses 148,233 60,624
Earnings (loss) before taxes from discontinued operations (87,695) 1,162
Income tax expense (benefit) 1,457 427
Net earnings (loss) from discontinued operations (89,152) 735
Discontinued Operations | Other    
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]    
Revenue 0 0
Cost of revenue 0 0
Corporate general and administrative expense 5,703 2,015
Impairment of assets held for sale 0 0
Interest expense (income), net 0 0
Total cost and expenses 5,703 2,015
Earnings (loss) before taxes from discontinued operations (5,703) (2,015)
Income tax expense (benefit) 0 (466)
Net earnings (loss) from discontinued operations $ (5,703) $ (1,549)