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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Operating Activities:    
Net income $ 87,045 $ 77,220
Non-cash items included in net income:    
Depreciation and amortization 198,272 188,961
Deferred income tax provision (15,958) (19,494)
Power and natural gas cost deferrals, net (25,046) (20,675)
Amortization of debt expense 2,431 1,506
Stock-based compensation expense 7,098 6,787
Equity-related AFUDC (4,921) (5,117)
Pension and other postretirement benefit expense 9,923 15,460
Other regulatory assets and liabilities (12,582) 7,934
Other deferred debits and credits 31,058 (4,349)
Change in decoupling regulatory deferral 11,231 28,455
Realized and unrealized loss (gain) on assets and investments 966 (13,783)
Other (2,525) 4,364
Contributions to defined benefit pension plan (10,000) (42,000)
Cash paid for settlement of interest rate swap agreements (409) (17,035)
Cash received for settlement of interest rate swap agreements 7,869  
Changes in certain current assets and liabilities:    
Accounts and notes receivable 119,908 32,347
Inventory (37,500) (38,714)
Collateral posted for derivative instruments 144,163 (29,362)
Income taxes receivable (1,417) 5,991
Other current assets (22,941) 4,074
Accounts payable (96,794) (22,145)
Other current liabilities 3,435 49,987
Net cash provided by operating activities 393,306 210,412
Investing Activities:    
Utility property capital expenditures (excluding equity-related AFUDC) (359,277) (331,309)
Equity and property investments (12,000) (9,061)
Proceeds from sale of investments 3,200 1,000
Other (503) (941)
Net cash used in investing activities (368,580) (340,311)
Financing Activities:    
Net decrease in short-term borrowings (241,500) (16,000)
Proceeds from issuance of long-term debt 250,000 399,856
Maturity of long-term debt and finance leases (15,926) (252,314)
Issuance of common stock, net of issuance costs 88,165 92,966
Cash dividends paid (105,163) (96,278)
Other (5,100) (6,136)
Net cash provided by (used in) financing activities (29,524) 122,094
Net decrease in cash and cash equivalents (4,798) (7,805)
Cash and cash equivalents at beginning of period 13,428 22,168
Cash and cash equivalents at end of period $ 8,630 $ 14,363