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Accounts receivable and allowance for doubtful accounts Receivables and allowance for expected credit losses (Tables) | 3 Months Ended
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Mar. 31, 2020
Credit Loss [Abstract] |
Financing Receivable, Allowance for Credit Loss [Table Text Block] | Details of the Company's expected credit losses were as follows:
| Balance at January 1, 2020 |  | Current Expected Credit Loss Provision |  | Write-offs Charged Against the Allowance |  | Credit Loss Recoveries Collected |  | Balance at March 31, 2020 |
| (In thousands)
Electric | $ | 328 |  | $ | 555 |  | $ | 500 |  | $ | 109 |  | $ | 492 |
Natural gas distribution | 1,056 |  | 1,156 |  | 624 |  | 229 |  | 1,817 |
Construction materials and contracting | 5,357 |  | 694 |  | 68 |  | — |  | 5,983 |
Construction services | 1,756 |  | 1,150 |  | 73 |  | — |  | 2,833 |
Total | $ | 8,497 |  | $ | 3,555 |  | $ | 1,265 |  | $ | 338 |  | $ | 11,125 |

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- Definition Tabular disclosure of allowance for credit loss on financing receivable. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -URI http://asc.fasb.org/extlink&oid=118936363&loc=SL6953423-111524 Reference 2: 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=119407570&loc=SL82919249-210447 + Details
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