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Segment Information Segment Information (Tables)
 12 Months Ended
Dec. 31, 2020
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,
202020192018
(in thousands)   
Operating Revenues, Unaffiliated Customers
Regulated Energy$350,853 $340,857 $343,313 
Unregulated Energy137,345 138,748 147,003 
Total operating revenues, unaffiliated customers$488,198 $479,605 $490,316 
Intersegment Revenues (1)
Regulated Energy$1,893 $2,149 $1,968 
Unregulated Energy15,181 15,403 14,902 
Other businesses528 529 652 
Total intersegment revenues$17,602 $18,081 $17,522 
Operating Income
Regulated Energy$92,124 $86,584 $79,215 
Unregulated Energy20,664 19,938 17,125 
Other businesses and eliminations(65)(237)(1,496)
Operating Income112,723 106,285 94,844 
Other income (expense), net3,222 (1,847)(607)
Interest charges21,765 22,224 16,146 
Income from Continuing Operations before Income Taxes94,180 82,214 78,091 
Income Taxes on Continuing Operations23,538 21,114 21,123 
Income from Continuing Operations70,642 61,100 56,968 
Income (loss) from Discontinued Operations, Net of Tax686 (1,349)(388)
Gain on sale of Discontinued Operations, Net of tax170 5,402 — 
Net Income$71,498 $65,153 $56,580 
Depreciation and Amortization
Regulated Energy$46,079 $35,227 $31,876 
Unregulated Energy11,988 10,130 8,263 
Other businesses and eliminations 50 67 81 
Total depreciation and amortization$58,117 $45,424 $40,220 
Capital Expenditures
Regulated Energy$147,100 130,604 $235,912 
Unregulated Energy46,295 60,034 38,585 
Other businesses2,480 8,348 8,364 
Total capital expenditures$195,875 $198,986 $282,861 
 
(1) All significant intersegment revenues are billed at market rates and have been eliminated from consolidated revenues.
As of December 31,
20202019
Identifiable Assets
Regulated Energy segment$1,547,619 $1,434,066 
Unregulated Energy segment
347,665 296,810 
Other businesses and eliminations37,203 52,322 
Total identifiable assets$1,932,487 $1,783,198