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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Operating Activities:    
Net income $ 71,495 $ 54,845
Non-cash items included in net income:    
Depreciation and amortization 67,930 65,219
Deferred income tax provision (18,971) (10,155)
Power and natural gas cost deferrals, net 42,701 (53,387)
Amortization of debt expense 507 1,128
Stock-based compensation expense 2,351 2,221
Equity-related AFUDC (1,753) (1,562)
Pension and other postretirement benefit expense 3,032 3,407
Other regulatory assets and liabilities (9,596) (10,717)
Other deferred debits and credits 18,959 19,759
Change in decoupling regulatory deferral (2,597) 19,391
Realized and unrealized loss (gain) on assets and investments (2,374) 182
Other (1,384) (1,157)
Contributions to defined benefit pension plan (3,333) (3,333)
Cash paid for settlement of interest rate swap agreements   (409)
Cash received for settlement of interest rate swap agreements 4,397 7,869
Changes in certain current assets and liabilities:    
Accounts and notes receivable (3,813) 37,743
Inventory (3,725) 5,900
Collateral for derivative instruments 21,853 66,371
Income taxes receivable 20,506 2,925
Other current assets (3,556) (17,543)
Accounts payable (27,029) (87,195)
Other current liabilities 14,547 (7,256)
Net cash provided by operating activities 190,147 94,246
Investing Activities:    
Utility property capital expenditures (excluding equity-related AFUDC) (118,709) (100,490)
Issuance of notes receivable   (1,500)
Equity and property investments (1,776) (4,781)
Other 2,385 518
Net cash used in investing activities (118,100) (106,253)
Financing Activities:    
Net decrease in short-term borrowings (54,000) (232,000)
Proceeds from issuance of long-term debt   250,000
Maturity of long-term debt and finance leases (850) (809)
Issuance of common stock, net of issuance costs 115 29,912
Cash dividends paid (37,817) (35,029)
Other (2,224) (2,899)
Net cash provided by (used in) financing activities (94,776) 9,175
Net decrease in cash and cash equivalents (22,729) (2,832)
Cash and cash equivalents at beginning of period 35,003 13,428
Cash and cash equivalents at end of period $ 12,274 $ 10,596