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Receivables and allowance for expected credit losses (Tables) | 9 Months Ended
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Sep. 30, 2021
Credit Loss [Abstract] |
Accounts Receivable, Allowance for Credit Loss [Table Text Block] | Details of the Company's expected credit losses were as follows:
| Electric | Natural gas distribution | Pipeline | Construction materials and contracting | Construction services | Total
| (In thousands)
At December 31, 2020 | $ | 899 |  | $ | 2,571 |  | $ | 2 |  | $ | 6,164 |  | $ | 5,722 |  | $ | 15,358 |
Current expected credit loss provision | 538 |  | 1,273 |  | — |  | (1,049) |  | (1,079) |  | (317) |
Less write-offs charged against the allowance | 888 |  | 1,107 |  | — |  | 273 |  | 401 |  | 2,669 |
Credit loss recoveries collected | 129 |  | 213 |  | — |  | — |  | — |  | 342 |
At March 31, 2021 | $ | 678 |  | $ | 2,950 |  | $ | 2 |  | $ | 4,842 |  | $ | 4,242 |  | $ | 12,714 |
Current expected credit loss provision | (110) |  | (103) |  | — |  | 11 |  | (639) |  | (841) |
Less write-offs charged against the allowance | 341 |  | 787 |  | — |  | 232 |  | 64 |  | 1,424 |
Credit loss recoveries collected | 100 |  | 199 |  | — |  | — |  | — |  | 299 |
At June 30, 2021 | $ | 327 |  | $ | 2,259 |  | $ | 2 |  | $ | 4,621 |  | $ | 3,539 |  | $ | 10,748 |
Current expected credit loss provision | 388 |  | 411 |  | — |  | 233 |  | (675) |  | 357 |
Less write-offs charged against the allowance | 525 |  | 1,178 |  | — |  | 184 |  | 265 |  | 2,152 |
Credit loss recoveries collected | 92 |  | 168 |  | — |  | — |  | 93 |  | 353 |
At September 30, 2021 | $ | 282 |  | $ | 1,660 |  | $ | 2 |  | $ | 4,670 |  | $ | 2,692 |  | $ | 9,306 |
| Electric | Natural gas distribution | Pipeline | Construction materials and contracting | Construction services | Total
| (In thousands)
At January 1, 2020 | $ | 328 |  | $ | 1,056 |  | $ | — |  | $ | 5,357 |  | $ | 1,756 |  | $ | 8,497 |
Current expected credit loss provision | 555 |  | 1,156 |  | — |  | 694 |  | 1,150 |  | 3,555 |
Less write-offs charged against the allowance | 500 |  | 624 |  | — |  | 68 |  | 73 |  | 1,265 |
Credit loss recoveries collected | 109 |  | 229 |  | — |  | — |  | — |  | 338 |
At March 31, 2020 | $ | 492 |  | $ | 1,817 |  | $ | — |  | $ | 5,983 |  | $ | 2,833 |  | $ | 11,125 |
Current expected credit loss provision | 303 |  | 190 |  | — |  | (314) |  | 896 |  | 1,075 |
Less write-offs charged against the allowance | 224 |  | 677 |  | — |  | 44 |  | 454 |  | 1,399 |
Credit loss recoveries collected | 88 |  | 201 |  | — |  | — |  | — |  | 289 |
At June 30, 2020 | $ | 659 |  | $ | 1,531 |  | $ | — |  | $ | 5,625 |  | $ | 3,275 |  | $ | 11,090 |
Current expected credit loss provision | 435 |  | 811 |  | 2 |  | 728 |  | 1,635 |  | 3,611 |
Less write-offs charged against the allowance | 269 |  | 692 |  | — |  | 229 |  | 117 |  | 1,307 |
Credit loss recoveries collected | 75 |  | 203 |  | — |  | — |  | — |  | 278 |
At September 30, 2020 | $ | 900 |  | $ | 1,853 |  | $ | 2 |  | $ | 6,124 |  | $ | 4,793 |  | $ | 13,672 |

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- Definition Tabular disclosure of allowance for credit loss on accounts receivable. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=121599337&loc=SL82919249-210447 + Details
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Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
Name: | us-gaap_CreditLossAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration