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Business Segment Information:
 12 Months Ended
Dec. 31, 2020
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 December 31, 20202019
Electric Utilities$3,120,928 $2,900,983 
Gas Utilities4,376,204 4,032,339 
Power Generation404,220 417,715 
Mining77,085 77,175 
Corporate and Other110,349 130,245 
Total assets$8,088,786 $7,558,457 

Capital Expenditures (a) for the years ended December 31,
20202019
Electric Utilities$271,104 $222,911 
Gas Utilities449,209 512,366 
Power Generation9,329 85,346 
Mining8,250 8,430 
Corporate and Other17,500 20,702 
Total capital expenditures$755,392 $849,755 
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(a)    Includes accruals for property, plant and equipment as disclosed in the Supplemental Cash Flow Information to the Consolidated Statement of Cash Flows.

Property, Plant and Equipment as of December 31, 20202019
Electric Utilities$3,248,480 $3,059,135 
Gas Utilities3,312,613 2,981,498 
Power Generation534,803 534,518 
Mining187,540 180,473 
Corporate and Other22,094 29,055 
Total property, plant and equipment$7,305,530 $6,784,679 
Consolidating Income Statement
Year ended December 31, 2020Electric UtilitiesGas UtilitiesPower GenerationMiningCorporateInter-Company EliminationsTotal
Revenue -
Contracts with customers$687,929 $959,696 $6,090 $27,089 $— $— $1,680,804 
Other revenues2,201 9,962 1,566 2,408 — — 16,137 
690,130 969,658 7,656 29,497 — — 1,696,941 
Inter-company operating revenue -
Contracts with customers23,914 4,724 97,169 31,478 167 (157,452)— 
Other revenues— 288 222 100 352,976 (353,586)— 
23,914 5,012 97,391 31,578 353,143 (511,038)— 
Total revenue714,044 974,670 105,047 61,075 353,143 (511,038)1,696,941 
Fuel, purchased power and cost of natural gas sold267,045 354,645 8,993 — 83 (138,362)492,404 
Operations and maintenance, including taxes196,794 303,577 33,695 39,033 284,501 (305,823)551,777 
Depreciation, depletion and amortization94,150 100,559 20,247 9,235 25,150 (24,884)224,457 
Adjusted operating income (loss)$156,055 $215,889 $42,112 $12,807 $43,409 $(41,969)$428,303 
Interest expense, net(143,470)
Impairment of investment(6,859)
Other income (expense), net(2,293)
Income tax benefit (expense)(32,918)
Income from continuing operations242,763 
(Loss) from discontinued operations, net of tax — 
Net income242,763 
Net income attributable to noncontrolling interest(15,155)
Net income available for common stock$227,608 

    
Consolidating Income Statement
Year ended December 31, 2019Electric UtilitiesGas UtilitiesPower GenerationMiningCorporateInter-Company EliminationsTotal
Revenue -
Contracts with customers$684,445 $1,007,187 $7,580 $27,180 $— $— $1,726,392 
Other revenues5,191 384 1,859 1,074 — $— 8,508 
689,636 1,007,571 9,439 28,254 — — 1,734,900 
Inter-company operating revenue -
Contracts with customers23,116 2,459 91,577 32,053 230 (149,435)— 
Other revenues— — 242 1,322 343,975 (345,539)— 
23,116 2,459 91,819 33,375 344,205 (494,974)— 
Total revenue712,752 1,010,030 101,258 61,629 344,205 (494,974)1,734,900 
Fuel, purchased power and cost of natural gas sold268,297 425,898 9,059 — 268 (132,693)570,829 
Operations and maintenance, including taxes195,581 301,844 28,429 40,032 286,799 (303,776)548,909 
Depreciation, depletion and amortization88,577 92,317 18,991 8,970 22,065 (21,800)209,120 
Adjusted operating income (loss)160,297 189,971 44,779 12,627 35,073 (36,705)406,042 
Interest expense, net(137,659)
Impairment of investment(19,741)
Other income (expense), net(5,740)
Income tax benefit (expense)(29,580)
Income from continuing operations213,322 
(Loss) from discontinued operations, net of tax— 
Net income213,322 
Net income attributable to noncontrolling interest(14,012)
Net income available for common stock$199,310 
Consolidating Income Statement
Year ended December 31, 2018Electric UtilitiesGas UtilitiesPower GenerationMiningCorporateInter-Company EliminationsTotal
Revenue -
Contracts with customers$686,272 $1,022,828 $5,833 $33,609 $— $— $1,748,542 
Other revenues2,427 955 1,413 931 — — 5,726 
688,699 1,023,783 7,246 34,540 — — 1,754,268 
Inter-company operating revenue -
Contracts with customers22,752 1,524 84,959 32,194 148 (141,577)— 
Other revenues— — 246 1,299 379,775 (381,320)— 
22,752 1,524 85,205 33,493 379,923 (522,897)— 
Total revenue711,451 1,025,307 92,451 68,033 379,923 (522,897)1,754,268 
Fuel, purchased power and cost of natural gas sold283,840 462,153 8,592 — 44 (129,019)625,610 
Operations and maintenance, including taxes186,175 291,481 25,135 43,728 324,916 (336,142)535,293 
Depreciation, depletion and amortization85,567 86,434 16,110 7,965 21,161 (20,909)196,328 
Adjusted operating income (loss)155,869 185,239 42,614 16,340 33,802 (36,827)397,037 
Interest expense, net(139,975)
Other income (expense), net(1,180)
Income tax benefit (expense)23,667 
Income from continuing operations279,549 
(Loss) from discontinued operations, net of tax(6,887)
Net income272,662 
Net income attributable to noncontrolling interest(14,220)
Net income available for common stock$258,442