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Discontinued Operations - Assets and Liabilities Held for Sale (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]    
Contract assets $ 967,827 $ 1,238,173
Current assets held for sale 237,617 517,100
Current liabilities related to assets held for sale 45,304 82,322
Total    
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]    
Accounts and notes receivable, net 52,528 102,564
Contract assets 2,188 7,276
Other current assets 9,810 62,228
Current assets held for sale 64,526 172,068
Property, plant and equipment, net 154,240 297,584
Goodwill 0 21,633
Investments 5,063 7,293
Other assets 13,788 18,522
Noncurrent assets held for sale 173,091 345,032
Total assets held for sale 237,617 517,100
Accounts payable 17,443 31,394
Contract liabilities 135 4,491
Accrued salaries, wages and benefits 6,140 9,832
Current liabilities related to assets held for sale 12,107 21,013
Current liabilities held for sale 35,825 66,730
Noncurrent liabilities held for sale 9,479 15,592
Total liabilities held for sale 45,304 82,322
Total from Discontinued Operations    
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]    
Accounts and notes receivable, net 52,464 85,051
Contract assets 2,188 3,497
Other current assets 7,098 54,116
Current assets held for sale 61,750 142,664
Property, plant and equipment, net 113,080 232,792
Goodwill 0 12,338
Investments 0 0
Other assets 13,788 5,868
Noncurrent assets held for sale 126,868 250,998
Total assets held for sale 188,618 393,662
Accounts payable 17,368 24,692
Contract liabilities 125 4,466
Accrued salaries, wages and benefits 6,042 8,913
Current liabilities related to assets held for sale 11,780 9,451
Current liabilities held for sale 35,315 47,522
Noncurrent liabilities held for sale 9,479 4,272
Total liabilities held for sale 44,794 51,794
Total from Discontinued Operations | AMECO    
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]    
Accounts and notes receivable, net 41,988 69,126
Contract assets 2,188 3,497
Other current assets 7,098 54,116
Current assets held for sale 51,274 126,739
Property, plant and equipment, net 113,080 232,792
Goodwill 0 12,338
Investments 0 0
Other assets 13,788 5,868
Noncurrent assets held for sale 126,868 250,998
Total assets held for sale 178,142 377,737
Accounts payable 17,355 24,692
Contract liabilities 125 4,466
Accrued salaries, wages and benefits 6,042 8,913
Current liabilities related to assets held for sale 11,780 9,451
Current liabilities held for sale 35,302 47,522
Noncurrent liabilities held for sale 9,479 4,272
Total liabilities held for sale 44,781 51,794
Total from Discontinued Operations | Other    
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]    
Accounts and notes receivable, net 10,476 15,925
Contract assets 0 0
Other current assets 0 0
Current assets held for sale 10,476 15,925
Property, plant and equipment, net 0 0
Goodwill 0 0
Investments 0 0
Other assets 0 0
Noncurrent assets held for sale 0 0
Total assets held for sale 10,476 15,925
Accounts payable 13 0
Contract liabilities 0 0
Accrued salaries, wages and benefits 0 0
Current liabilities related to assets held for sale 0 0
Current liabilities held for sale 13 0
Noncurrent liabilities held for sale 0 0
Total liabilities held for sale 13 0
Other Assets and Liabilities from Continuing Operations    
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]    
Accounts and notes receivable, net 64 17,513
Contract assets 0 3,779
Other current assets 2,712 8,112
Current assets held for sale 2,776 29,404
Property, plant and equipment, net 41,160 64,792
Goodwill 0 9,295
Investments 5,063 7,293
Other assets 0 12,654
Noncurrent assets held for sale 46,223 94,034
Total assets held for sale 48,999 123,438
Accounts payable 75 6,702
Contract liabilities 10 25
Accrued salaries, wages and benefits 98 919
Current liabilities related to assets held for sale 327 11,562
Current liabilities held for sale 510 19,208
Noncurrent liabilities held for sale 0 11,320
Total liabilities held for sale $ 510 $ 30,528