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Condensed Consolidated Statements of Cash Flows (unaudited) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Operating activities:    
Net income $ 121,024 $ 100,487
Adjustments to reconcile net income to net cash provided by (used in) operating activities:    
Depreciation, depletion and amortization 60,463 57,269
Deferred financing cost amortization 2,475 2,214
Stock compensation 3,638 3,257
Deferred income taxes 14,462 153
Employee benefit plans 1,173 2,304
Other adjustments, net 5,337 6,151
Changes in certain operating assets and liabilities:    
Materials, supplies and fuel 34,995 15,932
Accounts receivable and other current assets (71,241) (11,599)
Accounts payable and other current liabilities (8,422) (23,602)
Regulatory assets 98,528 (533,006)
Regulatory liabilities 0 (5,291)
Other operating activities, net 1,689 (355)
Net cash provided by (used in) operating activities 264,121 (386,086)
Investing activities:    
Property, plant and equipment additions (136,779) (146,302)
Other investing activities (1,065) 78
Net cash (used in) investing activities (137,844) (146,224)
Financing activities:    
Dividends paid on common stock (38,533) (35,514)
Common stock issued 3,791 0
Term loan - borrowings 0 800,000
Term loan - repayments 0 (200,000)
Net borrowings (payments) of Revolving Credit Facility and CP Program (78,700) (18,170)
Long-term debt - repayments 0 (1,436)
Distributions to non-controlling interest (4,420) (4,644)
Other financing activities (878) (740)
Net cash provided by (used in) financing activities (118,740) 539,496
Net change in cash, restricted cash and cash equivalents 7,537 7,186
Cash, restricted cash and cash equivalents at beginning of period 13,810 10,739
Cash, restricted cash and cash equivalents at end of period 21,347 17,925
Supplemental cash flow information:    
Interest, net of amounts capitalized (23,605) (21,232)
Income taxes 0 990
Accrued property, plant and equipment purchases at March 31 $ 39,559 $ 51,914