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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Operating activities:    
Net income $ 143,924 $ 156,870
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation, depletion and amortization 126,357 124,591
Deferred financing cost amortization 4,853 4,953
Stock compensation 4,311 3,834
Deferred income taxes 9,203 13,860
Employee benefit plans 5,898 1,383
Other adjustments, net (6,754) (9,489)
Change in certain operating assets and liabilities:    
Materials, supplies and fuel 73,022 (6,993)
Accounts receivable and other current assets 266,820 55,641
Accounts payable and other current liabilities (201,389) (24,130)
Regulatory assets 186,699 128,315
Other operating activities, net (7,873) (6,805)
Net cash provided by operating activities 605,071 442,030
Investing activities:    
Property, plant and equipment additions (261,739) (293,803)
Other investing activities 16,367 2,418
Net cash (used in) investing activities (245,372) (291,385)
Financing activities:    
Dividends paid on common stock (83,114) (77,136)
Common stock issued 54,689 20,095
Net borrowings (payments) of Revolving Credit Facility and CP Program (535,600) (85,130)
Long-term debt - issuance 350,000 0
Distributions to non-controlling interests (9,017) (8,604)
Other financing activities (5,095) 1,682
Net cash (used in) financing activities (228,137) (149,093)
Net change in cash, restricted cash and cash equivalents 131,562 1,552
Cash, restricted cash and cash equivalents beginning of period 26,985 13,810
Cash, restricted cash and cash equivalents end of period 158,547 15,362
Supplemental cash flow information:    
Interest (net of amounts capitalized) (75,507) (72,791)
Income taxes 34 752
Accrued property, plant and equipment purchases at June 30, $ 50,081 $ 49,229