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Business Segment Information:
 3 Months Ended
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, 2021December 31, 2020
Electric Utilities$3,217,474 $3,120,928 
Gas Utilities4,900,939 4,376,204 
Power Generation406,742 404,220 
Mining76,097 77,085 
Corporate and Other94,947 110,349 
Total assets$8,696,199 $8,088,786 

Three Months Ended March 31, 2021External Operating RevenueInter-company Operating RevenueTotal Revenues
 Contract Customers Other Revenues  Contract Customers Other Revenues
Segment:
Electric Utilities$220,500 $137 $6,771 $— $227,408 
Gas Utilities398,499 2,408 1,520 92 402,519 
Power Generation4,241 421 24,451 50 29,163 
Mining6,977 249 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, 2020External Operating RevenueInter-company Operating Revenue Total Revenues
 Contract Customers Other Revenues  Contract Customers Other Revenues
Segment:
Electric Utilities$167,503 $223 $6,413 $— $174,139 
Gas Utilities354,287 5,708 778 — 360,773 
Power Generation1,855 443 23,612 56 25,966 
Mining6,564 467 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,
20212020
Adjusted operating income:
Electric Utilities$21,813 $35,650 
Gas Utilities102,094 102,897 
Power Generation14,269 11,349 
Mining3,261 3,129 
Corporate and Other(3,122)160 
Operating income138,315 153,185 
Interest expense, net(37,600)(35,453)
Impairment of investment— (6,859)
Other income (expense), net266 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