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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Operating Activities:    
Net income $ 68,017 $ 48,424
Non-cash items included in net income:    
Depreciation and amortization 55,348 51,421
Deferred income tax provision and investment tax credits 5,966 (6,765)
Power and natural gas cost amortizations (deferrals), net (7,811) 6,380
Amortization of debt expense 823 653
Stock-based compensation expense 626 872
Equity-related AFUDC (1,754) (1,599)
Pension and other postretirement benefit expense 7,556 7,952
Other regulatory assets and liabilities and deferred debits and credits 1,762 11,902
Change in decoupling regulatory deferral (682) 4,155
Gain on sale of investments (155) (3,242)
Other (2,828) 5,112
Contributions to defined benefit pension plan (14,000) (7,300)
Changes in certain current assets and liabilities:    
Accounts and notes receivable 6,728 6,078
Materials and supplies, fuel stock and stored natural gas 4,291 9,901
Collateral posted for derivative instruments 1,497 (14,283)
Income taxes receivable 5,442 10,500
Income taxes payable 557 4,901
Other current assets (260) (2,166)
Accounts payable (2,590) (19,527)
Other current liabilities 16,557 21,905
Net cash provided by operating activities 145,090 135,274
Investing Activities:    
Utility property capital expenditures (excluding equity-related AFUDC) (97,203) (95,525)
Issuance of notes receivable (75) (2,779)
Equity and property investments (2,340) (1,313)
Proceeds from sale of investments 801 5,148
Other 2,356 (662)
Net cash used in investing activities (96,461) (95,131)
Financing Activities:    
Net decrease in short-term borrowings (10,000) (800)
Maturity of long-term debt and finance leases (759) (700)
Issuance of common stock, net of issuance costs 65 175
Cash dividends paid (29,399) (27,389)
Other (1,085) (2,406)
Net cash used in financing activities (41,178) (31,120)
Net increase in cash and cash equivalents 7,451 9,023
Cash and cash equivalents at beginning of period 14,196 9,896
Cash and cash equivalents at end of period $ 21,647 $ 18,919