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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Operating activities:      
Net income $ 270,758 $ 251,260 $ 242,763
Adjustments to reconcile net income to net cash provided by (used in) operating activities:      
Depreciation, depletion and amortization 250,909 235,953 224,457
Deferred financing cost amortization 9,843 6,968 7,883
Impairment of investment 0 0 6,859
Stock compensation 8,551 9,655 5,373
Deferred income taxes 25,592 7,261 38,091
Employee benefit plans 5,459 9,590 11,997
Other adjustments, net (4,720) 7,018 11,669
Change in certain operating assets and liabilities:      
Materials, supplies and fuel (75,403) (35,707) 2,755
Accounts receivable and other current assets (184,448) (43,170) (10,843)
Accounts payable and other current liabilities 89,405 10,660 24,659
Regulatory assets 203,869 (514,687) (5,047)
Regulatory liabilities (0) (9,533) (10,706)
Contributions to defined benefit pension plans 0 0 (12,700)
Other operating activities, net (15,014) 167 4,653
Net cash provided by (used in) operating activities 584,801 (64,565) 541,863
Investing activities:      
Property, plant and equipment additions (604,365) (677,492) (767,404)
Other investing activities 485 13,262 5,740
Net cash (used in) investing activities (603,880) (664,230) (761,664)
Financing activities:      
Dividends paid on common stock (156,723) (145,023) (135,439)
Common stock issued 90,044 118,979 99,278
Term Loan - borrowings 0 800,000 0
Term Loan - repayments 0 (800,000) 0
Net borrowings (payments) of Revolving Credit Facility and CP Program 115,420 186,140 (115,460)
Long-term debt - issuance 0 600,000 400,000
Long-term debt - repayments 0 (8,436) (8,597)
Distributions to non-controlling interests (17,418) (15,749) (15,839)
Other financing activities 931 (4,045) (7,061)
Net cash provided by financing activities 32,254 731,866 216,882
Net change in cash, restricted cash and cash equivalents 13,175 3,071 (2,919)
Cash, restricted cash and cash equivalents beginning of year 13,810 10,739 13,658
Cash, restricted cash and cash equivalents end of year 26,985 13,810 10,739
Supplemental cash flow information:      
Interest (net of amounts capitalized) (152,546) (142,685) (136,549)
Income taxes 771 1,521 2,172
Accrued property, plant and equipment purchases at December 31 59,347 68,758 72,215
Increase in capitalized assets associated with asset retirement obligations $ 14,032 $ 2,109 $ 4,774