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Condensed Consolidated Statements of Cash Flows (unaudited) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Operating activities:    
Net income $ 156,870 $ 128,774
Adjustments to reconcile net income to net cash provided by (used in) operating activities:    
Depreciation, depletion and amortization 124,591 115,712
Deferred financing cost amortization 4,953 4,381
Stock compensation 3,834 5,044
Deferred income taxes 13,860 692
Employee benefit plans 1,383 4,934
Other adjustments, net (9,489) 10,495
Changes in certain operating assets and liabilities:    
Materials, supplies and fuel (6,993) 3,974
Accounts receivable and other current assets 55,641 88,513
Accounts payable and other current liabilities (24,130) (59,640)
Regulatory assets 128,315 (540,709)
Regulatory liabilities 0 (9,509)
Other operating activities, net (6,805) (2,834)
Net cash provided by (used in) operating activities 442,030 (250,173)
Investing activities:    
Property, plant and equipment additions (293,803) (319,476)
Other investing activities 2,418 9,739
Net cash (used in) investing activities (291,385) (309,737)
Financing activities:    
Dividends paid on common stock (77,136) (71,092)
Common stock issued 20,095 40,037
Term loan - borrowings 0 800,000
Term loan - repayments 0 (200,000)
Net borrowings (payments) of Revolving Credit Facility and CP Program (85,130) (4,190)
Long-term debt - repayments 0 (1,436)
Distributions to non-controlling interest (8,604) (8,705)
Other financing activities 1,682 291
Net cash provided by (used in) financing activities (149,093) 554,905
Net change in cash, restricted cash and cash equivalents 1,552 (5,005)
Cash, restricted cash and cash equivalents at beginning of period 13,810 10,739
Cash, restricted cash and cash equivalents at end of period 15,362 5,734
Supplemental cash flow information:    
Interest, net of amounts capitalized (72,791) (71,825)
Income taxes 752 1,486
Accrued property, plant and equipment purchases at June 30 $ 49,229 $ 54,448