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Segment Information Segment Information (Tables)
 12 Months Ended
Dec. 31, 2022
Segment Reporting [Abstract]  
Schedule of Segment Reporting Information, by Segment [Table Text Block]
The following table presents information about our reportable segments.
For the Year Ended December 31,
202220212020
(in thousands)   
Operating Revenues, Unaffiliated Customers
Regulated Energy$422,894 $381,879 $350,853 
Unregulated Energy257,810 188,089 137,345 
Total operating revenues, unaffiliated customers$680,704 $569,968 $488,198 
Intersegment Revenues (1)
Regulated Energy$6,530 $2,041 $1,893 
Unregulated Energy22,940 18,780 15,181 
Other businesses308 527 528 
Total intersegment revenues$29,778 $21,348 $17,602 
Operating Income
Regulated Energy$115,317 $106,174 $92,124 
Unregulated Energy27,350 24,427 20,664 
Other businesses and eliminations266 511 (65)
Operating Income142,933 131,112 112,723 
Other income, net5,051 1,721 3,222 
Interest charges24,356 20,135 21,765 
Income from Continuing Operations before Income Taxes123,628 112,698 94,180 
Income Taxes on Continuing Operations33,832 29,231 23,538 
Income from Continuing Operations89,796 83,467 70,642 
Income (loss) from Discontinued Operations, Net of Tax— (1)686 
Gain on sale of Discontinued Operations, Net of tax— — 170 
Net Income$89,796 $83,466 $71,498 
Depreciation and Amortization
Regulated Energy$52,707 $48,748 $46,079 
Unregulated Energy16,257 13,869 11,988 
Other businesses and eliminations 9 44 50 
Total depreciation and amortization$68,973 $62,661 $58,117 
Capital Expenditures
Regulated Energy$97,554 $139,733 $147,100 
Unregulated Energy40,773 81,651 46,295 
Other businesses2,355 6,425 2,480 
Total capital expenditures$140,682 $227,809 $195,875 
     (1) All significant intersegment revenues are billed at market rates and have been eliminated from consolidated revenues.
As of December 31,
20222021
Identifiable Assets
Regulated Energy segment$1,716,255 $1,629,191 
Unregulated Energy segment
463,239 439,114 
Other businesses and eliminations35,543 46,564 
Total identifiable assets$2,215,037 $2,114,869