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Business Segment Information:
 9 Months Ended
Sep. 30, 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 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:September 30, 2021December 31, 2020
Electric Utilities$3,267,074 $3,120,928 
Gas Utilities5,052,898 4,376,204 
Power Generation398,915 404,220 
Mining76,791 77,085 
Corporate and Other114,712 110,349 
Total assets$8,910,390 $8,088,786 

Three Months Ended September 30, 2021External Operating RevenueInter-company Operating Revenue Total Revenues
 Contract Customers Other Revenues  Contract Customers  Other Revenues
Segment:
Electric Utilities$207,374 $203 $5,526 $— $213,103 
Gas Utilities161,977 1,087 1,520 99 164,683 
Power Generation2,333 412 23,725 50 26,520 
Mining6,969 235 8,845 339 16,388 
Inter-company eliminations— — (39,616)(488)(40,104)
Total$378,653 $1,937 $— $— $380,590 

Three Months Ended September 30, 2020External Operating RevenueInter-company Operating Revenue Total Revenues
 Contract Customers Other Revenues  Contract Customers  Other Revenues
Segment:
Electric Utilities$194,941 $224 $5,677 $— $200,842 
Gas Utilities141,275 863 1,601 190 143,929 
Power Generation1,528 414 24,521 55 26,518 
Mining6,568 777 8,100 (209)15,236 
Inter-company eliminations— — (39,899)(36)(39,935)
Total$344,312 $2,278 $— $— $346,590 
Nine Months Ended September 30, 2021External Operating RevenueInter-company Operating RevenueTotal Revenues
 Contract Customers Other Revenues  Contract Customers Other Revenues
Segment:
Electric Utilities$604,966 $2,619 $17,859 $— $625,444 
Gas Utilities743,663 4,745 4,559 285 753,252 
Power Generation8,006 1,219 71,656 150 81,031 
Mining20,658 718 23,093 1,020 45,489 
Inter-company eliminations— — (117,167)(1,455)(118,622)
Total$1,377,293 $9,301 $— $— $1,386,594 

Nine Months Ended September 30, 2020External Operating RevenueInter-company Operating Revenue Total Revenues
 Contract Customers Other Revenues  Contract Customers Other Revenues
Segment:
Electric Utilities$518,641 $2,074 $17,466 $— $538,181 
Gas Utilities655,386 7,083 3,153 190 665,812 
Power Generation4,625 1,206 72,609 166 78,606 
Mining20,062 1,477 23,855 463 45,857 
Inter-company eliminations— — (117,083)(819)(117,902)
Total$1,198,714 $11,840 $— $— $1,210,554 

Three Months Ended September 30,Nine Months Ended September 30,
2021202020212020
Adjusted operating income:
Electric Utilities$57,608 $52,083 $114,989 $121,726 
Gas Utilities17,257 18,147 139,336 139,253 
Power Generation10,323 8,738 32,842 31,489 
Mining4,908 3,505 11,813 9,992 
Corporate and Other(223)(239)(3,526)(108)
Operating income89,873 82,234 295,454 302,352 
Interest expense, net(38,018)(36,041)(113,820)(107,039)
Impairment of investment— — — (6,859)
Other income (expense), net1,560 (1,193)1,635 (703)
Income tax (expense)(5,253)(4,651)(6,333)(25,484)
Net income 48,162 40,349 176,936 162,267 
Net income attributable to non-controlling interest(4,050)(4,066)(11,347)(11,844)
Net income available for common stock$44,112 $36,283 $165,589 $150,423