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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Operating activities:      
Net income $ 251,260 $ 242,763 $ 213,322
Adjustments to reconcile net income to net cash provided by (used in) operating activities:      
Depreciation, depletion and amortization 235,953 224,457 209,120
Deferred financing cost amortization 6,968 7,883 7,838
Impairment of investment 0 6,859 19,741
Stock compensation 9,655 5,373 12,095
Deferred income taxes 7,261 38,091 38,020
Employee benefit plans 9,590 11,997 12,406
Other adjustments, net 7,018 11,669 16,485
Change in certain operating assets and liabilities:      
Materials, supplies and fuel (35,707) 2,755 2,052
Accounts receivable and other current assets (43,170) (10,843) 7,578
Accounts payable and other current liabilities 10,660 24,659 (34,906)
Regulatory assets (514,687) (5,047) 23,619
Regulatory liabilities (9,533) (10,706) (15,158)
Contributions to defined benefit pension plans 0 (12,700) (12,700)
Other operating activities, net 167 4,653 6,001
Net cash provided by (used in) operating activities (64,565) 541,863 505,513
Investing activities:      
Property, plant and equipment additions (677,492) (767,404) (818,376)
Other investing activities 13,262 5,740 2,166
Net cash (used in) investing activities (664,230) (761,664) (816,210)
Financing activities:      
Dividends paid on common stock (145,023) (135,439) (124,647)
Common stock issued 118,979 99,278 101,358
Term Loan - borrowings 800,000 0 0
Term Loan - repayments (800,000) 0 0
Net borrowings (payments) of Revolving Credit Facility and CP Program 186,140 (115,460) 163,880
Long-term debt - issuance 600,000 400,000 1,100,000
Long-term debt - repayments (8,436) (8,597) (905,743)
Distributions to non-controlling interests (15,749) (15,839) (17,901)
Other financing activities (4,045) (7,061) (16,737)
Net cash provided by financing activities 731,866 216,882 300,210
Net change in cash, restricted cash and cash equivalents 3,071 (2,919) (10,487)
Cash and cash equivalents:      
Cash, restricted cash and cash equivalents beginning of year 10,739 13,658 24,145
Cash, restricted cash and cash equivalents end of year 13,810 10,739 13,658
Supplemental cash flow information:      
Interest (net of amounts capitalized) (142,685) (136,549) (131,774)
Income taxes 1,521 2,172 4,682
Accrued property, plant and equipment purchases at December 31 68,758 72,215 91,491
Increase in capitalized assets associated with asset retirement obligations $ 2,109 $ 4,774 $ 5,044