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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Operating activities:    
Net income $ 192,684 $ 194,704
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation, depletion and amortization 191,235 188,610
Deferred financing cost amortization 6,928 7,430
Stock compensation 4,563 6,779
Deferred income taxes 16,114 16,062
Employee benefit plans 7,929 2,677
Other adjustments, net (6,099) (10,243)
Change in certain operating assets and liabilities:    
Materials, supplies and fuel 43,546 (88,405)
Accounts receivable and other current assets 302,764 64,280
Accounts payable and other current liabilities (186,500) 5,963
Regulatory assets 199,093 118,330
Other operating activities, net (16,205) (11,900)
Net cash provided by operating activities 756,052 494,287
Investing activities:    
Property, plant and equipment additions (421,770) (466,302)
Other investing activities 17,985 (19)
Net cash (used in) investing activities (403,785) (466,321)
Financing activities:    
Dividends paid on common stock (125,446) (115,850)
Common stock issued 107,380 20,027
Net borrowings (payments) of Revolving Credit Facility and CP Program (535,600) 81,170
Long-term debt - issuance 800,000 0
Distributions to non-controlling interests (12,891) (11,678)
Other financing activities (12,193) 1,647
Net cash provided by (used in) financing activities 221,250 (24,684)
Net change in cash, restricted cash and cash equivalents 573,517 3,282
Cash, restricted cash and cash equivalents beginning of period 26,985 13,810
Cash, restricted cash and cash equivalents end of period 600,502 17,092
Supplemental cash flow information:    
Interest (net of amounts capitalized) (108,813) (98,227)
Income taxes 51 746
Accrued property, plant and equipment purchases at September 30, $ 52,984 $ 42,687