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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Operating Activities:      
Net Income $ 324,133 $ 289,951 $ 261,893
Adjustments to reconcile net income to net cash provided by operating activities:      
Depreciation and amortization 258,402 228,091 199,908
Deferred income taxes and investment tax credits (31,491) (17,592) 39,613
Changes in regulatory assets and liabilities 31,229 115,026 (4,748)
Pension and postretirement benefit plan expense 45,214 45,800 27,155
Contributions to pension and postretirement benefit plans (27,613) (25,463) (55,337)
Earnings of unconsolidated equity-method investments 4,922 4,539 12,426
Distributions from unconsolidated equity-method investments 9,225 7,850 2,950
Allowance for equity funds used during construction (62,489) (53,238) (43,221)
Other non-cash adjustments to net income, net 8,547 10,443 8,414
Change in:      
Accounts receivable 9,688 31,434 (17,628)
Accounts payable and other accrued liabilities (3,666) (8,931) (3,220)
Taxes accrued/receivable 18,370 (84,261) (53,243)
Other current assets (16,168) 16,939 (81,244)
Other current liabilities 5,814 10,769 (12,551)
Other assets 37,565 32,138 10,712
Net cash provided by operating activities 601,838 594,417 267,027
Investing Activities:      
Additions to property, plant and equipment (1,179,327) (1,009,279) (611,137)
Payments received from transmission project joint funding partners 151,880 83,708 26,501
Payments to Acquire Partners Interest in Real Estate Partnership, Net of Cash Acquired (16,494) (3,814) (2,533)
Payments to Acquire Equity Securities, FV-NI (10,871) (11,642) (12,235)
Debt Securities, Held-to-Maturity, Purchase (2,896) (1,845) (1,617)
Proceeds from Sale, Debt Security, Trading, and Equity Security, FV-NI, Held-for-Investment 12,398 10,641 8,921
Other 16,406 14,570 2,153
Net cash used in investing activities (1,028,904) (917,661) (589,947)
Financing Activities:      
Issuance of long-term debt 400,000 300,000 872,000
Premium on issuance of long-term debt [Abstract] (3,072) (186) (7,006)
Retirement of long-term debt (19,885) (49,800) (225,000)
Finance Lease, Principal Payments 3,762 0 0
Dividends on common stock (188,482) (176,565) (163,545)
Proceeds from Issuance of Common Stock 97,777 298,450 0
Acquisition of treasury stock (3,336) (3,782) (3,274)
Other (5,321) (3,437) (403)
Net cash used in financing activities 273,919 364,680 472,772
Net (decrease) increase in cash and cash equivalents (153,147) 41,436 149,852
Cash and cash equivalents at beginning of the year 368,865 327,429 177,577
Cash and cash equivalents at end of the year 215,718 368,865 327,429
Cash paid during the period for:      
Interest (net of amount capitalized) 139,277 109,067 97,742
Non-cash investing activities:      
Additions to property, plant and equipment in accounts payable 222,340 168,107 185,400
Right-of-Use Asset Obtained in Exchange for Finance Lease Liability $ 226,618 $ 0 $ 0