XML 63 R51.htm IDEA: XBRL DOCUMENT v3.23.2
Other Comprehensive Income: Reclassification Out of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2023
Mar. 31, 2023
Jun. 30, 2022
Mar. 31, 2022
Jun. 30, 2023
Jun. 30, 2022
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]            
Interest expense $ 43,267   $ 39,053   $ 87,332 $ 77,874
Fuel, purchased power and cost of natural gas sold 121,245   188,171   647,512 625,097
Operations and maintenance 145,767   132,968   286,755 269,100
Income Tax Expense (Benefit) 6,089   658   (8,584) (13,830)
Net income 26,544 $ 117,380 35,846 $ 121,024 143,924 156,870
Reclassification out of Accumulated Other Comprehensive Income            
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]            
Operations and maintenance 0   22   0 46
Net income (923)   424   (2,998) 1,465
Cash Flow Hedging | Reclassification out of Accumulated Other Comprehensive Income            
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]            
Income before income taxes (1,202)   610   (3,865) 2,151
Income Tax Expense (Benefit) 295   (81)   911 (456)
Net income (907)   529   (2,954) 1,695
Cash Flow Hedging | Reclassification out of Accumulated Other Comprehensive Income | Interest Rate Swap            
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]            
Interest expense (713)   (713)   (1,426) (1,426)
Cash Flow Hedging | Reclassification out of Accumulated Other Comprehensive Income | Commodity Contract            
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]            
Fuel, purchased power and cost of natural gas sold (489)   1,323   (2,439) 3,577
Accumulated Defined Benefit Plans Adjustment, Net Unamortized Gain (Loss) | Reclassification out of Accumulated Other Comprehensive Income            
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]            
Operations and maintenance (43)   (187)   (87) (375)
Accumulated Defined Benefit Plans Adjustment | Reclassification out of Accumulated Other Comprehensive Income            
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]            
Income before income taxes (43)   (165)   (87) (329)
Income Tax Expense (Benefit) 27   60   43 99
Net income $ (16)   $ (105)   $ (44) $ (230)