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Business Segment Information: | 3 Months Ended
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Mar. 31, 2022
Segment Reporting Information, Additional Information [Abstract] |
Business Segment Information | Business Segment Information Our CODM reviews financial information presented on an operating segment basis for purposes of making decisions and assessing financial performance. Our CODM assesses the performance of our operating segments based on operating income. For the first nine months of 2021, we had reported four operating segments: Electric Utilities, Gas Utilities, Power Generation and Mining. In the fourth quarter of 2021, we changed our operating segments to align with the revised manner in which our CODM reviews our financial performance and allocates resources. Our power generation and mining businesses, which were previously presented as separate operating segments, are now part of our Electric Utilities segment. This change aligns with our vertically integrated business model for our Electric Utilities. Comparative periods presented reflect this change. Our operating segments are equivalent to our reportable segments. Segment information was as follows (in thousands):
Total assets (net of intercompany eliminations) as of: | March 31, 2022 |  | December 31, 2021
Electric Utilities | $ | 3,804,335 |  |  | $ | 3,796,662 |
Gas Utilities | 5,232,594 |  |  | 5,246,370 |
Corporate and Other | 93,725 |  |  | 88,864 |
Total assets | $ | 9,130,654 |  |  | $ | 9,131,896 |
Three Months Ended March 31, 2022 | External Operating Revenue |  | Inter-company Operating Revenue |  | Total Revenues
Contract Customers | Other Revenues | Contract Customers | Other Revenues
Segment: |  |  |  |  |  |  |
Electric Utilities | $ | 202,739 |  | $ | 870 |  |  | $ | 2,929 |  | $ | — |  |  | $ | 206,538 |
Gas Utilities | 619,030 |  | 931 |  |  | 1,319 |  | 112 |  |  | 621,392 |
Inter-company eliminations | — |  | — |  |  | (4,248) |  | (112) |  |  | (4,360) |
Total | $ | 821,769 |  | $ | 1,801 |  |  | $ | — |  | $ | — |  |  | $ | 823,570 |
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 | $ | 231,718 |  | $ | 807 |  |  | $ | 2,879 |  | $ | — |  |  | $ | 235,404 |
Gas Utilities | 398,499 |  | 2,408 |  |  | 1,520 |  | 92 |  |  | 402,519 |
Inter-company eliminations | — |  | — |  |  | (4,399) |  | (92) |  |  | (4,491) |
Total | $ | 630,217 |  | $ | 3,215 |  |  | $ | — |  | $ | — |  |  | $ | 633,432 |
|  | Three Months Ended March 31,
|  |  | 2022 | 2021
Operating income (loss): |  |  |  |
Electric Utilities |  |  | $ | 50,746 |  | $ | 39,343 |
Gas Utilities |  |  | 123,540 |  | 102,094 |
Corporate and Other |  |  | (933) |  | (3,122) |
Operating income |  |  | 173,353 |  | 138,315 |
Interest expense, net |  |  | (38,545) |  | (37,600) |
Other income, net |  |  | 704 |  | 266 |
Income tax expense |  |  | (14,488) |  | (494) |
Net income |  |  | 121,024 |  | 100,487 |
Net income attributable to non-controlling interest |  |  | (3,498) |  | (4,171) |
Net income available for common stock |  |  | $ | 117,526 |  | $ | 96,316 |

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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=123359005&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=123359005&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=123359005&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=123359005&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=123359005&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=123359005&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=123359005&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=123359005&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=123359005&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=123359005&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=123359005&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=123359005&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=123359005&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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