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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Operating activities:      
Net income $ 242,763 $ 213,322 $ 272,662
Loss from discontinued operations, net of tax 0 0 6,887
Income from continuing operations 242,763 213,322 279,549
Adjustments to reconcile net income to net cash provided by operating activities:      
Depreciation, depletion and amortization 224,457 209,120 196,328
Deferred financing cost amortization 7,883 7,838 7,845
Impairment of investment 6,859 19,741 0
Stock compensation 5,373 12,095 12,390
Deferred income taxes 38,091 38,020 (24,239)
Employee benefit plans 11,997 12,406 14,068
Other adjustments, net 11,669 16,485 5,836
Change in certain operating assets and liabilities:      
Materials, supplies and fuel 2,755 2,052 (2,919)
Accounts receivable and other current assets (10,843) 7,578 (45,966)
Accounts payable and other current liabilities 24,659 (34,906) 5,305
Regulatory assets - current (5,047) 23,619 33,608
Regulatory liabilities - current (10,706) (15,158) 18,533
Contributions to defined benefit pension plans (12,700) (12,700) (12,700)
Other operating activities, net 4,653 6,001 6,689
Net cash provided by operating activities of continuing operations 541,863 505,513 494,327
Net cash provided by (used in) operating activities of discontinued operations 0 0 (5,516)
Net cash provided by operating activities 541,863 505,513 488,811
Investing activities:      
Property, plant and equipment additions (767,404) (818,376) (457,524)
Purchase of investment 0 0 (24,429)
Other investing activities 5,740 2,166 (4,281)
Net cash (used in) investing activities of continuing operations (761,664) (816,210) (486,234)
Net cash provided by investing activities of discontinued operations 0 0 20,385
Net cash (used in) investing activities (761,664) (816,210) (465,849)
Financing activities:      
Dividends paid on common stock (135,439) (124,647) (106,591)
Common stock issued 99,278 101,358 300,834
Net (payments) borrowings of short-term debt (115,460) 163,880 (25,680)
Long-term debt - issuance 400,000 1,100,000 700,000
Long-term debt - repayments (8,597) (905,743) (854,743)
Distributions to noncontrolling interests (15,839) (17,901) (19,617)
Other financing activities (7,061) (16,737) (11,260)
Net cash provided by (used in) financing activities 216,882 300,210 (17,057)
Net change in cash, restricted cash and cash equivalents (2,919) (10,487) 5,905
Cash and cash equivalents:      
Cash, restricted cash and cash equivalents beginning of year 13,658 24,145 18,240
Cash, restricted cash and cash equivalents end of year 10,739 13,658 24,145
Supplemental cash flow information:      
Interest (net of amounts capitalized) (136,549) (131,774) (137,965)
Income taxes 2,172 4,682 (14,730)
Accrued property, plant and equipment purchases at December 31 72,215 91,491 69,017
Increase in capitalized assets associated with asset retirement obligations $ 4,774 $ 5,044 $ 2,625