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Business Segment Information:
 9 Months Ended
Sep. 30, 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 integrated our power generation and mining businesses within the Electric Utilities segment. The alignment is consistent with the current way our CODM evaluates the performance of the business and makes decisions related to the allocation of resources. 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:September 30, 2022December 31, 2021
Electric Utilities$3,889,596 $3,796,662 
Gas Utilities5,330,209 5,246,370 
Corporate and Other102,489 88,864 
Total assets$9,322,294 $9,131,896 

Three Months Ended September 30, 2022External Operating RevenueInter-company Operating Revenue Total Revenues
 Contract Customers Other Revenues  Contract Customers  Other Revenues
Segment:
Electric Utilities$254,917 $824 $2,928 $— $258,669 
Gas Utilities205,951 920 1,319 98 208,288 
Inter-company eliminations— — (4,247)(98)(4,345)
Total$460,868 $1,744 $— $— $462,612 

Three Months Ended September 30, 2021External Operating RevenueInter-company Operating Revenue Total Revenues
 Contract Customers Other Revenues  Contract Customers  Other Revenues
Segment:
Electric Utilities$216,676 $850 $2,878 $— $220,404 
Gas Utilities161,977 1,087 1,520 99 164,683 
Inter-company eliminations— — (4,398)(99)(4,497)
Total$378,653 $1,937 $— $— $380,590 

Nine Months Ended September 30, 2022External Operating RevenueInter-company Operating RevenueTotal Revenues
 Contract Customers Other Revenues  Contract Customers Other Revenues
Segment:
Electric Utilities$656,036 $4,764 $8,786 $— $669,586 
Gas Utilities1,096,925 2,652 3,957 315 1,103,849 
Inter-company eliminations— — (12,743)(315)(13,058)
Total$1,752,961 $7,416 $— $— $1,760,377 

Nine Months Ended September 30, 2021External Operating RevenueInter-company Operating Revenue Total Revenues
 Contract Customers Other Revenues  Contract Customers Other Revenues
Segment:
Electric Utilities$633,630 $4,556 $8,638 $— $646,824 
Gas Utilities743,663 4,745 4,559 285 753,252 
Inter-company eliminations— — (13,197)(285)(13,482)
Total$1,377,293 $9,301 $— $— $1,386,594 
Three Months Ended September 30,Nine Months Ended September 30,
2022202120222021
Operating income (loss):
Electric Utilities$69,483 $72,840 $165,455 $159,645 
Gas Utilities10,583 17,257 162,318 139,336 
Corporate and Other(587)(224)(2,552)(3,527)
Operating income79,479 89,873 325,221 295,454 
Interest expense, net(40,019)(38,018)(117,328)(113,820)
Other income, net464 1,560 2,731 1,635 
Income tax (expense)(2,090)(5,253)(15,920)(6,333)
Net income 37,834 48,162 194,704 176,936 
Net income attributable to non-controlling interest(2,861)(4,050)(8,790)(11,347)
Net income available for common stock$34,973 $44,112 $185,914 $165,589