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Business Segment Information:
 12 Months Ended
Dec. 31, 2021
Segment Reporting Information, Additional Information [Abstract]  
Business Segment Information BUSINESS SEGMENT INFORMATION
Our chief operating decision maker (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.

In the prior year, we had reported four operating segments: Electric Utilities, Gas Utilities, Power Generation and Mining. In the fourth quarter of 2021, we changed our operating segments to align with the revised manner in which our CODM reviews our financial performance and allocates resources. Our power generation and mining businesses, which were previously presented as separate operating segments, are now part of our Electric Utilities segment. This change aligns with our vertically integrated business model for our Electric Utilities. 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 December 31, 20212020
Electric Utilities$3,796,662 $3,602,233 
Gas Utilities5,246,370 4,376,204 
Corporate and Other88,864 110,349 
Total assets$9,131,896 $8,088,786 
Capital Expenditures (a) for the years ended December 31,
202120202019
Electric Utilities$285,770 $288,683 $316,687 
Gas Utilities383,320 449,209 512,366 
Corporate and Other10,500 17,500 20,702 
Total capital expenditures$679,590 $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.

Consolidating Income Statement
Year ended December 31, 2021Electric UtilitiesGas UtilitiesCorporateInter-Company EliminationsTotal
Revenue -
Contracts with customers$825,404 $1,105,430 $— $— $1,930,834 
Other revenues5,336 12,932 — — 18,268 
830,740 1,118,362 — — 1,949,102 
Inter-company operating revenue -
Contracts with customers11,518 6,110 196 (17,824)— 
Other revenues— 393 356,151 (356,544)— 
11,518 6,503 356,347 (374,368)— 
Total revenue842,258 1,124,865 356,347 (374,368)1,949,102 
Fuel, purchased power and cost of natural gas sold248,018 494,738 96 (918)741,934 
Operations and maintenance, including taxes260,036 314,810 293,265 (306,325)561,786 
Depreciation, depletion and amortization131,528 104,160 26,838 (26,573)235,953 
Operating income (loss)$202,676 $211,157 $36,148 $(40,552)$409,429 
Interest expense, net(152,404)
Impairment of investment— 
Other income (expense), net1,404 
Income tax benefit (expense)(7,169)
Net income251,260 
Net income attributable to non-controlling interest(14,516)
Net income available for common stock$236,744 
Consolidating Income Statement
Year ended December 31, 2020Electric UtilitiesGas UtilitiesCorporateInter-Company EliminationsTotal
Revenue -
Contracts with customers$721,108 $959,696 $— $— $1,680,804 
Other revenues6,175 9,962 — $— 16,137 
727,283 969,658 — — 1,696,941 
Inter-company operating revenue -
Contracts with customers11,574 4,724 167 (16,465)— 
Other revenues— 288 352,976 (353,264)— 
11,574 5,012 353,143 (369,729)— 
Total revenue738,857 974,670 353,143 (369,729)1,696,941 
Fuel, purchased power and cost of natural gas sold138,572 354,645 83 (896)492,404 
Operations and maintenance, including taxes265,679 303,577 284,501 (301,980)551,777 
Depreciation, depletion and amortization123,632 100,559 25,150 (24,884)224,457 
Operating income (loss)210,974 215,889 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)
Net income242,763 
Net income attributable to non-controlling interest(15,155)
Net income available for common stock$227,608 

Consolidating Income Statement
Year ended December 31, 2019Electric UtilitiesGas UtilitiesCorporateInter-Company EliminationsTotal
Revenue -
Contracts with customers$719,205 $1,007,187 $— $— $1,726,392 
Other revenues8,124 384 — — 8,508 
727,329 1,007,571 — — 1,734,900 
Inter-company operating revenue -
Contracts with customers12,026 2,459 230 (14,715)— 
Other revenues— — 343,974 (343,974)— 
12,026 2,459 344,204 (358,689)— 
Total revenue739,355 1,010,030 344,204 (358,689)1,734,900 
Fuel, purchased power and cost of natural gas sold145,972 425,898 269 (1,310)570,829 
Operations and maintenance, including taxes259,167 301,844 286,800 (298,902)548,909 
Depreciation, depletion and amortization116,539 92,317 22,065 (21,801)209,120 
Operating income (loss)217,677 189,971 35,070 (36,676)406,042 
Interest expense, net(137,659)
Impairment of investment(19,741)
Other income (expense), net(5,740)
Income tax benefit (expense)(29,580)
Net income213,322 
Net income attributable to non-controlling interest(14,012)
Net income available for common stock$199,310