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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Net Cash Provided by (Used in) Operating Activities [Abstract]      
Net Income (Loss) Attributable to Parent $ 188,993 $ 94,936  
Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract]      
Depreciation & Amortization 208,431 164,816  
Conservation amortization 34,060 27,393  
Deferred Income Taxes and Tax Credits 6,622 8,602  
Unrealized Gain (Loss) on Derivatives (23,002) 48,541  
Afudc Equity (5,780) (5,603)  
Monetized production tax credits (45,178) (23,543)  
Other Noncash Income (Expense) 3,518 (6,075)  
Increase (Decrease) in Other Regulatory Assets (14,351) (16,865)  
Purchased gas adjustment 40,868 41,429  
Increase (Decrease) in Other Operating Assets (5,695) (27,016)  
Increase (Decrease) in Operating Capital [Abstract]      
Increase (Decrease) in Accounts and Other Receivables (19,743) 24,120  
Increase (Decrease) in Materials and Supplies 442 1,072  
Increase (Decrease) in Fuel Inventories 10,052 14,497  
Increase (Decrease) in Prepaid Expense and Other Assets (3,884) 251  
Increase (Decrease) in Accounts Payable (14,868) (45,236)  
Increase (Decrease) in Income Taxes Payable 23,476 21,178  
Increase (Decrease) in Other Accounts Payable and Accrued Liabilities (512) (11,126)  
Net Cash Provided by (Used in) Operating Activities, Total 383,449 311,371  
Net Cash Provided by (Used in) Investing Activities [Abstract]      
Construction expenditures excluding equity allowance for funds used during construction (213,781) (223,707)  
Payments for (Proceeds from) Other Investing Activities 362 (233)  
Net Cash Provided by (Used in) Investing Activities, Total (213,419) (223,940)  
Net Cash Provided by (Used in) Financing Activities [Abstract]      
Proceeds from (Repayments of) Short-term Debt (182,800) (100,000)  
Payments of Dividends (22,939) (22,645)  
Proceeds from Issuance of Long-term Debt 8,800 7,400  
Repayments of Long-term Debt (66) 0  
Proceeds from (Payments for) Other Financing Activities 6,074 3,670  
Net Cash Provided by (Used in) Financing Activities, Total (190,931) (111,575)  
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect, Total (20,901) (24,144)  
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Beginning Balance 81,851 66,146 $ 66,146
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Ending Balance 60,950 42,002 81,851
Supplemental Cash Flow Information [Abstract]      
Interest Paid, Excluding Capitalized Interest, Operating Activities 77,160 78,636  
Cash Flow, Noncash Investing and Financing Activities Disclosure [Abstract]      
Capital Expenditures Incurred but Not yet Paid 54,805 56,699  
Subsidiaries [Member]      
Net Cash Provided by (Used in) Operating Activities [Abstract]      
Net Income (Loss) Attributable to Parent 199,470 111,321  
Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract]      
Depreciation & Amortization 208,362 164,771  
Conservation amortization 34,060 27,393  
Deferred Income Taxes and Tax Credits 21,044 12,215  
Unrealized Gain (Loss) on Derivatives (23,002) 48,541  
Afudc Equity (5,780) (5,603)  
Monetized production tax credits (45,178) (23,543)  
Other Noncash Income (Expense) 885 (8,711)  
Increase (Decrease) in Other Regulatory Assets (14,351) (16,865)  
Purchased gas adjustment 40,868 41,429  
Increase (Decrease) in Other Operating Assets (3,077) (23,801)  
Increase (Decrease) in Operating Capital [Abstract]      
Increase (Decrease) in Accounts and Other Receivables (17,957) 25,892  
Increase (Decrease) in Materials and Supplies 442 1,072  
Increase (Decrease) in Fuel Inventories 10,052 14,497  
Increase (Decrease) in Prepaid Expense and Other Assets (3,884) 251  
Increase (Decrease) in Accounts Payable (14,853) (36,201)  
Increase (Decrease) in Income Taxes Payable 23,527 26,850  
Increase (Decrease) in Other Accounts Payable and Accrued Liabilities 3,549 (7,607)  
Net Cash Provided by (Used in) Operating Activities, Total 414,177 351,901  
Net Cash Provided by (Used in) Investing Activities [Abstract]      
Construction expenditures excluding equity allowance for funds used during construction (205,927) (225,612)  
Payments for (Proceeds from) Other Investing Activities 362 (233)  
Net Cash Provided by (Used in) Investing Activities, Total (205,565) (225,845)  
Net Cash Provided by (Used in) Financing Activities [Abstract]      
Proceeds from (Repayments of) Short-term Debt (182,800) (100,000)  
Payments of Dividends (52,053) (53,794)  
Repayments of Long-term Debt (66) 0  
Proceeds from (Payments for) Other Financing Activities 6,080 3,668  
Net Cash Provided by (Used in) Financing Activities, Total (228,839) (150,126)  
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect, Total (20,227) (24,070)  
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Beginning Balance 80,721 64,891 64,891
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Ending Balance 60,494 40,821 $ 80,721
Supplemental Cash Flow Information [Abstract]      
Interest Paid, Excluding Capitalized Interest, Operating Activities 47,749 47,115  
Cash Flow, Noncash Investing and Financing Activities Disclosure [Abstract]      
Capital Expenditures Incurred but Not yet Paid $ 54,805 $ 56,699