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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 | 6 Months Ended
--- | --- | ---
Jun. 30, 2025 | Mar. 31, 2025 | Jun. 30, 2024 | Mar. 31, 2024 | Jun. 30, 2025 | Jun. 30, 2024
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |  |  |
Current expected credit loss provision |  |  |  |  | $ 3,179 | $ 3,103
Trade Accounts Receivable |  |  |  |  |  |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |  |  |
Beginning balance | $ 3,104 | $ 1,839 | $ 2,648 | $ 1,603 | 1,839 | 1,603
Current expected credit loss provision | 27 | 3,152 | 405 | 2,698 |  |
Less write-offs charged against the allowance | 1,335 | 2,305 | 1,432 | 2,114 |  |
Credit loss recoveries collected | 239 | 418 | 276 | 461 |  |
Ending balance | 2,035 | 3,104 | 1,897 | 2,648 | 2,035 | 1,897
Electric | Trade Accounts Receivable |  |  |  |  |  |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |  |  |
Beginning balance | 542 | 473 | 684 | 414 | 473 | 414
Current expected credit loss provision | 178 | 939 | 190 | 782 |  |
Less write-offs charged against the allowance | 333 | 1,036 | 463 | 659 |  |
Credit loss recoveries collected | 74 | 166 | 80 | 147 |  |
Ending balance | 461 | 542 | 491 | 684 | 461 | 491
Natural gas distribution | Trade Accounts Receivable |  |  |  |  |  |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |  |  |
Beginning balance | 2,562 | 1,366 | 1,964 | 1,189 | 1,366 | 1,189
Current expected credit loss provision | (151) | 2,213 | 215 | 1,916 |  |
Less write-offs charged against the allowance | 1,002 | 1,269 | 969 | 1,455 |  |
Credit loss recoveries collected | 165 | 252 | 196 | 314 |  |
Ending balance | 1,574 | 2,562 | 1,406 | 1,964 | 1,574 | 1,406
Pipeline | Trade Accounts Receivable |  |  |  |  |  |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |  |  |
Beginning balance | 0 | 0 | 0 | 0 | 0 | 0
Current expected credit loss provision | 0 | 0 | 0 | 0 |  |
Less write-offs charged against the allowance | 0 | 0 | 0 | 0 |  |
Credit loss recoveries collected | 0 | 0 | 0 | 0 |  |
Ending balance | $ 0 | $ 0 | $ 0 | $ 0 | $ 0 | $ 0

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