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Receivables, net - Major Categories of Receivables (Details) - USD ($) $ in Thousands | Dec. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total gross receivables | $ 512,511 | $ 600,252
Less: allowance for credit losses | 769 | 1,547
Total net receivables | 511,742 | 598,705
Contracts completed and in progress: |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Billed | 250,656 | 343,190
Unbilled | 127,776 | 119,170
Total gross receivables | 378,432 | 462,360
Materials sales |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total gross receivables | 55,770 | 61,808
Other |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total gross receivables | $ 78,309 | $ 76,084

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