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Business Segment Information: | 3 Months Ended
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Mar. 31, 2021
Segment Reporting Information, Additional Information [Abstract] |
Business Segment Information | Business Segment Information Our reportable segments are based on our method of internal reporting, which is generally segregated by differences in products, services and regulation. All of our operations and assets are located within the United States. Accounting standards for presentation of segments require an approach based on the way we organize the segments for making operating decisions and how the Chief Operating Decision Maker (CODM) assesses performance. The CODM assesses the performance of our segments using adjusted operating income, which recognizes intersegment revenues, costs, and assets for Colorado Electric’s PPA with Black Hills Colorado IPP on an accrual basis rather than as a finance lease. This presentation of segment information does not impact consolidated financial results. Segment information was as follows (in thousands):
Total assets (net of intercompany eliminations) as of: | March 31, 2021 |  | December 31, 2020
Electric Utilities | $ | 3,217,474 |  |  | $ | 3,120,928 |
Gas Utilities | 4,900,939 |  |  | 4,376,204 |
Power Generation | 406,742 |  |  | 404,220 |
Mining | 76,097 |  |  | 77,085 |
Corporate and Other | 94,947 |  |  | 110,349 |
Total assets | $ | 8,696,199 |  |  | $ | 8,088,786 |
Three Months Ended March 31, 2021 | External Operating Revenue |  | Inter-company Operating Revenue |  | Total Revenues
Contract Customers | Other Revenues | Contract Customers | Other Revenues
Segment: |  |  |  |  |  |  |
Electric Utilities | $ | 220,500 |  | $ | 137 |  |  | $ | 6,771 |  | $ | — |  |  | $ | 227,408 |
Gas Utilities | 398,499 |  | 2,408 |  |  | 1,520 |  | 92 |  |  | 402,519 |
Power Generation | 4,241 |  | 421 |  |  | 24,451 |  | 50 |  |  | 29,163 |
Mining | 6,977 |  | 249 |  |  | 7,106 |  | 340 |  |  | 14,672 |
Inter-company eliminations | — |  | — |  |  | (39,848) |  | (482) |  |  | (40,330) |
Total | $ | 630,217 |  | $ | 3,215 |  |  | $ | — |  | $ | — |  |  | $ | 633,432 |
Three Months Ended March 31, 2020 | External Operating Revenue |  | Inter-company Operating Revenue |  | Total Revenues
Contract Customers | Other Revenues | Contract Customers | Other Revenues
Segment: |  |  |  |  |  |  |
Electric Utilities | $ | 167,503 |  | $ | 223 |  |  | $ | 6,413 |  | $ | — |  |  | $ | 174,139 |
Gas Utilities | 354,287 |  | 5,708 |  |  | 778 |  | — |  |  | 360,773 |
Power Generation | 1,855 |  | 443 |  |  | 23,612 |  | 56 |  |  | 25,966 |
Mining | 6,564 |  | 467 |  |  | 7,839 |  | 335 |  |  | 15,205 |
Inter-company eliminations | — |  | — |  |  | (38,642) |  | (391) |  |  | (39,033) |
Total | $ | 530,209 |  | $ | 6,841 |  |  | $ | — |  | $ | — |  |  | $ | 537,050 |
|  | Three Months Ended March 31,
|  |  | 2021 | 2020
Adjusted operating income: |  |  |  |
Electric Utilities |  |  | $ | 21,813 |  | $ | 35,650 |
Gas Utilities |  |  | 102,094 |  | 102,897 |
Power Generation |  |  | 14,269 |  | 11,349 |
Mining |  |  | 3,261 |  | 3,129 |
Corporate and Other |  |  | (3,122) |  | 160 |
Operating income |  |  | 138,315 |  | 153,185 |
Interest expense, net |  |  | (37,600) |  | (35,453) |
Impairment of investment |  |  | — |  | (6,859) |
Other income (expense), net |  |  | 266 |  | 2,353 |
Income tax (expense) |  |  | (494) |  | (16,002) |
Net income |  |  | 100,487 |  | 97,224 |
Net income attributable to noncontrolling interest |  |  | (4,171) |  | (4,050) |
Net income available for common stock |  |  | $ | 96,316 |  | $ | 93,174 |

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- Definition The entire disclosure for reporting segments including data and tables. Reportable segments include those that meet any of the following quantitative thresholds a) it's reported revenue, including sales to external customers and intersegment sales or transfers is 10 percent or more of the combined revenue, internal and external, of all operating segments b) the absolute amount of its reported profit or loss is 10 percent or more of the greater, in absolute amount of 1) the combined reported profit of all operating segments that did not report a loss or 2) the combined reported loss of all operating segments that did report a loss c) its assets are 10 percent or more of the combined assets of all operating segments. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 31 -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8924-108599 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 34 -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8981-108599 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 21 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8721-108599 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 40 -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e9031-108599 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 32 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8933-108599 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 32 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8933-108599 Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 26 -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8844-108599 Reference 8: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 41 -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e9038-108599 Reference 9: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 32 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8933-108599 Reference 10: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8736-108599 Reference 11: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 42 -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e9054-108599 Reference 12: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8657-108599 Reference 13: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 21 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8721-108599 Reference 14: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -URI http://asc.fasb.org/topic&trid=2134510 + Details
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