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Condensed Consolidated Statements of Cash Flows (unaudited) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Operating activities:    
Net income $ 100,487 $ 97,224
Adjustments to reconcile net income to net cash provided by (used in) operating activities:    
Depreciation, depletion and amortization 57,269 56,402
Deferred financing cost amortization 2,214 2,237
Impairment of investment 0 6,859
Stock compensation 3,257 291
Deferred income taxes 153 21,876
Employee benefit plans 2,304 1,235
Other adjustments, net 6,151 892
Changes in certain operating assets and liabilities:    
Materials, supplies and fuel 15,932 19,222
Accounts receivable and other current assets (11,599) 8,171
Accounts payable and other current liabilities (23,602) (43,297)
Regulatory assets (533,006) 20,679
Regulatory liabilities (5,291) 1,316
Other operating activities, net (355) (1,138)
Net cash provided by (used in) operating activities (386,086) 191,969
Investing activities:    
Property, plant and equipment additions (146,302) (171,882)
Other investing activities 78 (1,202)
Net cash (used in) investing activities (146,224) (173,084)
Financing activities:    
Dividends paid on common stock (35,514) (32,902)
Common stock issued 0 99,321
Term loan - borrowings 800,000 0
Term loan - repayments (200,000) 0
Net (payments) borrowings of Revolving Credit Facility and CP Program (18,170) (30,375)
Long-term debt - repayments (1,436) (4,291)
Distributions to noncontrolling interest (4,644) (4,741)
Other financing activities (740) (1,391)
Net cash provided by financing activities 539,496 25,621
Net change in cash, restricted cash and cash equivalents 7,186 44,506
Cash, restricted cash and cash equivalents at beginning of period 10,739 13,658
Cash, restricted cash and cash equivalents at end of period 17,925 58,164
Supplemental cash flow information:    
Interest, net of amounts capitalized (21,232) (21,776)
Income taxes 990 0
Accrued property, plant and equipment purchases at March 31 $ 51,914 $ 53,011