XML 68 R57.htm IDEA: XBRL DOCUMENT v3.22.2
Other Comprehensive Income: Reclassification Out of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2022
Mar. 31, 2022
Jun. 30, 2021
Mar. 31, 2021
Jun. 30, 2022
Jun. 30, 2021
Condensed Statement of Income Captions [Line Items]            
Interest Expense $ 39,053   $ 38,669   $ 77,874 $ 76,494
Fuel, purchased power and cost of natural gas sold 188,171   108,474   625,097 401,621
Operations and maintenance 132,968   123,245   269,100 252,924
Income tax benefit (expense) 658   (586)   (13,830) (1,080)
Net income (loss) 35,846 $ 121,024 28,287 $ 100,487 156,870 128,774
Reclassification out of Accumulated Other Comprehensive Income            
Condensed Statement of Income Captions [Line Items]            
Net income (loss) 424   (943)   1,465 (1,854)
Cash Flow Hedging | Reclassification out of Accumulated Other Comprehensive Income            
Condensed Statement of Income Captions [Line Items]            
Income before Income Taxes 610   (657)   2,151 (1,401)
Income tax benefit (expense) (81)   136   (456) 334
Net income (loss) 529   (521)   1,695 (1,067)
Cash Flow Hedging | Reclassification out of Accumulated Other Comprehensive Income | Interest rate swaps            
Condensed Statement of Income Captions [Line Items]            
Interest Expense (713)   (713)   (1,426) (1,426)
Cash Flow Hedging | Reclassification out of Accumulated Other Comprehensive Income | Commodity Contract            
Condensed Statement of Income Captions [Line Items]            
Fuel, purchased power and cost of natural gas sold 1,323   56   3,577 25
Accumulated Defined Benefit Plans Adjustment, Net Prior Service Cost | Reclassification out of Accumulated Other Comprehensive Income            
Condensed Statement of Income Captions [Line Items]            
Operations and maintenance 22   24   46 49
Accumulated Defined Benefit Plans Adjustment, Net Unamortized Gain (Loss) | Reclassification out of Accumulated Other Comprehensive Income            
Condensed Statement of Income Captions [Line Items]            
Operations and maintenance (187)   (597)   (375) (1,195)
Accumulated Defined Benefit Plans Adjustment | Reclassification out of Accumulated Other Comprehensive Income            
Condensed Statement of Income Captions [Line Items]            
Income before Income Taxes (165)   (573)   (329) (1,146)
Income tax benefit (expense) 60   151   99 359
Net income (loss) $ (105)   $ (422)   $ (230) $ (787)