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Business Segment Information:
 6 Months Ended
Jun. 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:June 30, 2022December 31, 2021
Electric Utilities$3,834,826 $3,796,662 
Gas Utilities5,197,194 5,246,370 
Corporate and Other102,542 88,864 
Total assets$9,134,562 $9,131,896 

Three Months Ended June 30, 2022External Operating RevenueInter-company Operating Revenue Total Revenues
 Contract Customers Other Revenues  Contract Customers  Other Revenues
Segment:
Electric Utilities$198,380 $3,070 $2,929 $— $204,379 
Gas Utilities271,944 801 1,319 105 274,169 
Inter-company eliminations— — (4,248)(105)(4,353)
Total$470,324 $3,871 $— $— $474,195 

Three Months Ended June 30, 2021External Operating RevenueInter-company Operating Revenue Total Revenues
 Contract Customers Other Revenues  Contract Customers  Other Revenues
Segment:
Electric Utilities$185,235 $2,900 $2,881 $— $191,016 
Gas Utilities183,187 1,250 1,519 94 186,050 
Inter-company eliminations— — (4,400)(94)(4,494)
Total$368,422 $4,150 $— $— $372,572 

Six Months Ended June 30, 2022External Operating RevenueInter-company Operating RevenueTotal Revenues
 Contract Customers Other Revenues  Contract Customers Other Revenues
Segment:
Electric Utilities$401,119 $3,940 $5,858 $— $410,917 
Gas Utilities890,974 1,732 2,638 217 895,561 
Inter-company eliminations— — (8,496)(217)(8,713)
Total$1,292,093 $5,672 $— $— $1,297,765 

Six Months Ended June 30, 2021External Operating RevenueInter-company Operating Revenue Total Revenues
 Contract Customers Other Revenues  Contract Customers Other Revenues
Segment:
Electric Utilities$416,954 $3,706 $5,760 $— $426,420 
Gas Utilities581,686 3,658 3,039 186 588,569 
Inter-company eliminations— — (8,799)(186)(8,985)
Total$998,640 $7,364 $— $— $1,006,004 
Three Months Ended June 30,Six Months Ended June 30,
2022202120222021
Operating income (loss):
Electric Utilities$45,226 $47,462 $95,972 $86,805 
Gas Utilities28,195 19,985 151,735 122,079 
Corporate and Other(1,032)(181)(1,965)(3,303)
Operating income72,389 67,266 245,742 205,581 
Interest expense, net(38,764)(38,202)(77,309)(75,802)
Other income (expense), net1,563 (191)2,267 75 
Income tax benefit (expense)658 (586)(13,830)(1,080)
Net income 35,846 28,287 156,870 128,774 
Net income attributable to non-controlling interest(2,431)(3,126)(5,929)(7,297)
Net income available for common stock$33,415 $25,161 $150,941 $121,477