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Receivables and allowance for expected credit losses - Schedule of Accounts Receivable, Allowance for Credit Loss (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2024 | Jun. 30, 2024 | Mar. 31, 2024 | Sep. 30, 2023 | Jun. 30, 2023 | Mar. 31, 2023 | Sep. 30, 2024 | Sep. 30, 2023
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |  |  |  |  |
Current expected credit loss provision |  |  |  |  |  |  | $ 4,902 | $ 9,769
Trade Accounts Receivable |  |  |  |  |  |  |  |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |  |  |  |  |
Beginning balance | $ 9,153 | $ 10,156 | $ 9,570 | $ 6,873 | $ 6,351 | $ 4,154 | 9,570 | 4,154
Current expected credit loss provision | 1,934 | 681 | 2,287 | 3,907 | 2,097 | 3,765 |  |
Less write-offs charged against the allowance | 2,799 | 1,973 | 2,162 | 3,357 | 1,873 | 1,943 |  |
Credit loss recoveries collected | 384 | 289 | 461 | 308 | 298 | 375 |  |
Ending balance | 8,672 | 9,153 | 10,156 | 7,731 | 6,873 | 6,351 | 8,672 | 7,731
Electric | Trade Accounts Receivable |  |  |  |  |  |  |  |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |  |  |  |  |
Beginning balance | 491 | 684 | 414 | 413 | 468 | 375 | 414 | 375
Current expected credit loss provision | 520 | 190 | 782 | 513 | 182 | 615 |  |
Less write-offs charged against the allowance | 594 | 463 | 659 | 572 | 316 | 667 |  |
Credit loss recoveries collected | 86 | 80 | 147 | 75 | 79 | 145 |  |
Ending balance | 503 | 491 | 684 | 429 | 413 | 468 | 503 | 429
Natural gas distribution | Trade Accounts Receivable |  |  |  |  |  |  |  |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |  |  |  |  |
Beginning balance | 1,405 | 1,964 | 1,189 | 1,740 | 2,943 | 1,615 | 1,189 | 1,615
Current expected credit loss provision | 1,330 | 214 | 1,916 | 1,661 | 90 | 2,324 |  |
Less write-offs charged against the allowance | 2,121 | 969 | 1,455 | 2,758 | 1,454 | 1,225 |  |
Credit loss recoveries collected | 255 | 196 | 314 | 233 | 161 | 229 |  |
Ending balance | 869 | 1,405 | 1,964 | 876 | 1,740 | 2,943 | 869 | 876
Pipeline | Trade Accounts Receivable |  |  |  |  |  |  |  |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |  |  |  |  |
Beginning balance | 0 | 0 | 0 | 2 | 2 | 2 | 0 | 2
Current expected credit loss provision | 0 | 0 | 0 | 0 | 0 | 0 |  |
Less write-offs charged against the allowance | 0 | 0 | 0 | 0 | 0 | 0 |  |
Credit loss recoveries collected | 0 | 0 | 0 | 0 | 0 | 0 |  |
Ending balance | 0 | 0 | 0 | 2 | 2 | 2 | 0 | 2
Construction services | Trade Accounts Receivable |  |  |  |  |  |  |  |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |  |  |  |  |
Beginning balance | 7,257 | 7,508 | 7,967 | 4,718 | 2,938 | 2,162 | 7,967 | 2,162
Current expected credit loss provision | 84 | 277 | (411) | 1,733 | 1,825 | 826 |  |
Less write-offs charged against the allowance | 84 | 541 | 48 | 27 | 103 | 51 |  |
Credit loss recoveries collected | 43 | 13 | 0 | 0 | 58 | 1 |  |
Ending balance | $ 7,300 | $ 7,257 | $ 7,508 | $ 6,424 | $ 4,718 | $ 2,938 | $ 7,300 | $ 6,424

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