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Risk Management and Derivatives: Credit Risk (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
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Sep. 30, 2020 | Sep. 30, 2020 | Sep. 30, 2019
Accounts Receivable, Credit Loss Expense (Reversal) |  | $ 8,471 | $ 5,637
Adjustment Related to COVID-19 |  |  |
Accounts Receivable, Credit Loss Expense (Reversal) | $ 1,700 | $ 3,700 |

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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=121599337&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=120395209&loc=SL114868664-224227 + Details
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Balance Type: | debit
Period Type: | duration

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- Details
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Balance Type: |
Period Type: |