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Property, Plant and Equipment - Summary of Property, Plant and Equipment (Details) - USD ($)
$ in Thousands
Dec. 31, 2023
Dec. 31, 2022
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, net of accumulated depreciation $ 2,418,375 $ 2,212,717
Electric Plant in Service    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross 3,127,093 2,958,311
Less Accumulated Depreciation and Amortization 851,148 859,988
Property, Plant and Equipment, net of accumulated depreciation 2,275,945 2,098,323
Nonelectric Property, Plant and Equipment    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross 349,986 309,098
Less Accumulated Depreciation and Amortization 207,556 194,704
Property, Plant and Equipment, net of accumulated depreciation 142,430 114,394
Production | Electric Plant in Service    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross 1,412,826 1,343,097
Transmission | Electric Plant in Service    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross 777,613 756,848
Distribution | Electric Plant in Service    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross 654,704 612,716
General | Electric Plant in Service    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross 144,738 131,718
Electric Plant in Service | Electric Plant in Service    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross 2,989,881 2,844,379
Construction Work in Progress | Electric Plant in Service    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross 137,212 113,932
Construction Work in Progress | Nonelectric Property, Plant and Equipment    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross 38,062 15,170
Equipment | Nonelectric Property, Plant and Equipment    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross 233,571 218,770
Buildings and Leasehold Improvements | Nonelectric Property, Plant and Equipment    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross 64,753 61,506
Land | Nonelectric Property, Plant and Equipment    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross 13,600 13,652
Nonelectric Property, Plant and Equipment | Nonelectric Property, Plant and Equipment    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross $ 311,924 $ 293,928