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Condensed Consolidated Statements Of Capitalization - USD ($)
$ in Thousands
Sep. 30, 2024
Dec. 31, 2023
Stockholders' equity:    
Common stock, $0.50 par value $ 138,975 $ 138,297
Capital in excess of par value 4,186,048 4,137,696
Retained earnings 1,943,876 1,706,675
Treasury stock, at cost (87,965) (86,485)
Total stockholders' equity 6,180,934 5,896,183
Long-term debt of subsidiaries (substantially collateralized by utility plant):    
Long-term debt of subsidiaries 3,104,266 3,163,008
Total long-term debt 7,308,266 6,938,008
Current portion of long-term debt 29,218 67,415
Long-term debt, excluding current portion 7,279,048 6,870,593
Less: debt issuance costs 48,880 44,508
Long-term debt, excluding current portion, net of debt issuance costs 7,230,168 6,826,085
Total capitalization 13,411,102 12,722,268
Notes Ranging From 0.00% To 0.99% [Member]    
Long-term debt of subsidiaries (substantially collateralized by utility plant):    
Long-term debt of subsidiaries 2,637 2,935
Notes Ranging From 1.00% To 1.99% [Member]    
Long-term debt of subsidiaries (substantially collateralized by utility plant):    
Long-term debt of subsidiaries 10,491 7,538
Notes Ranging From 2.00% To 2.99% [Member]    
Long-term debt of subsidiaries (substantially collateralized by utility plant):    
Long-term debt of subsidiaries 206,662 207,917
Notes Ranging From 3.00% To 3.99% [Member]    
Long-term debt of subsidiaries (substantially collateralized by utility plant):    
Long-term debt of subsidiaries 1,258,624 1,313,932
Notes Ranging From 4.00% To 4.99% [Member]    
Long-term debt of subsidiaries (substantially collateralized by utility plant):    
Long-term debt of subsidiaries 1,241,248 1,245,727
Notes Ranging From 5.00% To 5.99% [Member]    
Long-term debt of subsidiaries (substantially collateralized by utility plant):    
Long-term debt of subsidiaries 313,193 312,745
Notes Ranging From 6.00% To 6.99% [Member]    
Long-term debt of subsidiaries (substantially collateralized by utility plant):    
Long-term debt of subsidiaries 31,000 31,000
Notes Ranging From 7.00% To 7.99% [Member]    
Long-term debt of subsidiaries (substantially collateralized by utility plant):    
Long-term debt of subsidiaries 27,947 28,125
Notes Ranging From 8.00% To 8.99% [Member]    
Long-term debt of subsidiaries (substantially collateralized by utility plant):    
Long-term debt of subsidiaries 664 1,289
Notes Ranging From 9.00% To 9.99% [Member]    
Long-term debt of subsidiaries (substantially collateralized by utility plant):    
Long-term debt of subsidiaries 11,800 11,800
Revolving Credit Agreement, Due 2027 [Member]    
Long-term debt of subsidiaries (substantially collateralized by utility plant):    
Notes payable to bank under revolving credit agreement, variable rate, due 2027 159,000 720,000
Notes At 2.40% Due 2031 [Member]    
Long-term debt of subsidiaries (substantially collateralized by utility plant):    
Unsecured notes payable 400,000 400,000
Notes At 2.704% Due 2030 [Member]    
Long-term debt of subsidiaries (substantially collateralized by utility plant):    
Unsecured notes payable 500,000 500,000
Notes Ranging From 3.01% To 3.59% Due 2029 Through 2050 [Member]    
Long-term debt of subsidiaries (substantially collateralized by utility plant):    
Unsecured notes payable 1,125,000 1,125,000
Notes At 4.276%, Due 2049 [Member]    
Long-term debt of subsidiaries (substantially collateralized by utility plant):    
Unsecured notes payable 500,000 500,000
Notes At 4.80%, Due 2027 [Member]    
Long-term debt of subsidiaries (substantially collateralized by utility plant):    
Unsecured notes payable 500,000  
Notes At 5.30%, Due 2052 [Member]    
Long-term debt of subsidiaries (substantially collateralized by utility plant):    
Unsecured notes payable 500,000 500,000
Notes At 5.375%, Due 2034 [Member]    
Long-term debt of subsidiaries (substantially collateralized by utility plant):    
Unsecured notes payable 500,000  
Notes At 5.95%, Due 2024 through 2034 [Member]    
Long-term debt of subsidiaries (substantially collateralized by utility plant):    
Unsecured notes payable $ 20,000 $ 30,000