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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Cash Provided by (Used in) Operating Activity, Including Discontinued Operation [Abstract]    
Net Income $ 88,450 $ 98,168
Adjustments to reconcile net income to cash provided by operations:    
Depreciation and depletion 133,809 124,779
Amortization of debt issuance costs, premium, and deferred hedge gain 1,926 2,343
Stock-based compensation costs 4,088 4,168
Equity portion of allowance for funds used during construction (4,587) (4,066)
Deferred income taxes 14,406 16,746
Increase (Decrease) in Other Operating Assets and Liabilities, Net 41 (151)
Changes in current assets and liabilities:    
Accounts receivable 40,967 32,841
Inventories (13,480) (2,458)
Other current assets (5,410) 9,907
Accounts payable (7,781) (27,688)
Accrued expenses and other 22,571 (2,861)
Regulatory assets (12,532) (27,653)
Regulatory liabilities (11,969) (4,200)
Other noncurrent assets and liabilities (17,185) (8,576)
Cash Provided by Operating Activities 233,232 211,601
Cash Provided by (Used in) Investing Activity, Including Discontinued Operation [Abstract]    
Property, plant, and equipment additions (304,772) (220,978)
Investment in debt & equity securities (1,070) (5,778)
Cash Used in Investing Activities (305,842) (226,756)
Cash Provided by (Used in) Financing Activity, Including Discontinued Operation [Abstract]    
Dividends on common stock (82,103) (80,654)
Issuance of long-term debt 375,000 500,000
Repayment of short-term borrowings (50,000) 0
Repayments on long-term debt (60,000) (300,000)
Line of credit repayments, net (114,000) (103,000)
Other financing activities, net (1,925) (3,660)
Cash Provided by Financing Activities 66,972 12,686
Decrease in Cash, Cash Equivalents, and Restricted Cash (5,638) (2,469)
Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents, Beginning Balance 30,738 29,017
Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents, Ending Balance 25,100 26,548
Cash Paid [Abstract]    
Interest Paid, Excluding Capitalized Interest, Operating Activity 76,713 67,166
Cash Flow, Noncash Investing and Financing Activities Disclosure [Abstract]    
Capital expenditures included in accounts payable $ 34,653 $ 32,015