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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

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