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Condensed Consolidated Statements of Cash Flows (unaudited) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Operating activities:    
Net income $ 194,704 $ 176,936
Adjustments to reconcile net income to net cash provided by (used in) operating activities:    
Depreciation, depletion and amortization 188,610 174,871
Deferred financing cost amortization 7,430 3,892
Stock compensation 6,779 7,245
Deferred income taxes 16,062 5,844
Employee benefit plans 2,677 6,779
Other adjustments, net (10,243) 2,708
Changes in certain operating assets and liabilities:    
Materials, supplies and fuel (88,405) (29,948)
Accounts receivable and other current assets 64,280 97,348
Accounts payable and other current liabilities 5,963 (20,094)
Regulatory assets 118,330 (559,389)
Regulatory liabilities 0 (9,533)
Other operating activities, net (11,900) (1,419)
Net cash provided by (used in) operating activities 494,287 (144,760)
Investing activities:    
Property, plant and equipment additions (466,302) (497,849)
Other investing activities (19) 13,743
Net cash (used in) investing activities (466,321) (484,106)
Financing activities:    
Dividends paid on common stock (115,850) (106,957)
Common stock issued 20,027 62,977
Term loan - borrowings 0 800,000
Term loan - repayments 0 (800,000)
Net borrowings (payments) of Revolving Credit Facility and CP Program 81,170 98,485
Long-term debt - issuances 0 600,000
Long-term debt - repayments 0 (8,436)
Distributions to non-controlling interest (11,678) (10,230)
Other financing activities 1,647 (2,778)
Net cash provided by (used in) financing activities (24,684) 633,061
Net change in cash, restricted cash and cash equivalents 3,282 4,195
Cash, restricted cash and cash equivalents at beginning of period 13,810 10,739
Cash, restricted cash and cash equivalents at end of period 17,092 14,934
Supplemental cash flow information:    
Interest, net of amounts capitalized (98,227) (93,325)
Income taxes 746 1,486
Accrued property, plant and equipment purchases at September 30 $ 42,687 $ 55,619