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Receivables and allowance for expected credit losses (Details 2) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2022 | Mar. 31, 2021
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |
Provision for credit losses | $ 1,735 | $ (317)
Trade Accounts Receivable |  |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |
Balance | 9,716 | 15,358
Provision for credit losses | 1,735 | (317)
Less write-offs charged against the allowance | 1,627 | 2,669
Credit loss recoveries collected | 332 | 342
Balance | 10,156 | 12,714
Electric | Trade Accounts Receivable |  |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |
Balance | 269 | 899
Provision for credit losses | 565 | 538
Less write-offs charged against the allowance | 597 | 888
Credit loss recoveries collected | 124 | 129
Balance | 361 | 678
Natural gas distribution | Trade Accounts Receivable |  |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |
Balance | 1,506 | 2,571
Provision for credit losses | 1,369 | 1,273
Less write-offs charged against the allowance | 932 | 1,107
Credit loss recoveries collected | 180 | 213
Balance | 2,123 | 2,950
Pipeline | Trade Accounts Receivable |  |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |
Balance | 2 | 2
Provision for credit losses | 0 | 0
Less write-offs charged against the allowance | 0 | 0
Credit loss recoveries collected | 0 | 0
Balance | 2 | 2
Construction materials and contracting | Trade Accounts Receivable |  |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |
Balance | 5,406 | 6,164
Provision for credit losses | (253) | (1,049)
Less write-offs charged against the allowance | 27 | 273
Credit loss recoveries collected | 0 | 0
Balance | 5,126 | 4,842
Construction services | Trade Accounts Receivable |  |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |
Balance | 2,533 | 5,722
Provision for credit losses | 54 | (1,079)
Less write-offs charged against the allowance | 71 | 401
Credit loss recoveries collected | 28 | 0
Balance | $ 2,544 | $ 4,242

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- Definition Amount of allowance for credit loss on accounts receivable. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 13 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=124255953&loc=SL82919249-210447 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=123577603&loc=d3e5074-111524 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 13 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=124255953&loc=SL82919249-210447 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=124255206&loc=SL82895884-210446 + Details
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- Definition Amount of increase in allowance for credit loss on accounts receivable, from recovery. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 13 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=124255953&loc=SL82919249-210447 + Details
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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
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- Definition Amount of direct write-downs of accounts receivable charged against the allowance. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 13 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=124255953&loc=SL82919249-210447 + Details
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- Definition Amount of expense (reversal of expense) for expected credit loss on accounts receivable. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 13 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=124255953&loc=SL82919249-210447 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(5)) -URI http://asc.fasb.org/extlink&oid=123367319&loc=SL114868664-224227 + Details
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