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Schedule I - Condensed Financial Information of Registrant - CONDENSED BALANCE SHEETS, PARENT COMPANY (Details) - USD ($)
$ in Thousands
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Current Assets        
Cash and Cash Equivalents $ 294,651 $ 230,373    
Accounts Receivable from Subsidiaries 145,964 157,143    
Other 30,579 16,826    
Total Current Assets 630,041 570,170    
Investments in Subsidiaries 121,177 62,516    
Deferred Income Taxes 176,448 174,407    
Other Assets 66,416 51,377    
Total Assets 3,652,082 3,242,568    
Current Liabilities        
Accounts Payable to Subsidiaries 113,574 94,428    
Other 45,582 43,775    
Total Current Liabilities 309,790 309,757    
Other Noncurrent Liabilities 98,397 75,977    
Commitments and Contingencies (Note 14)    
Capitalization        
Long-Term Debt 943,734 824,059    
Total Shareholders' Equity 1,668,499 1,443,006 $ 1,217,317 $ 990,777
Total Capitalization 2,612,233 2,267,065    
Total Liabilities and Shareholders' Equity 3,652,082 3,242,568    
OTC        
Current Assets        
Cash and Cash Equivalents 291,575 228,137    
Other 3,538 977    
Total Current Assets 305,578 231,786    
Deferred Income Taxes 69,781 65,244    
Other Assets 109,057 50,795    
Total Assets 2,569,555 2,152,309    
Current Liabilities        
Other 19,100 15,320    
Total Current Liabilities 771,732 583,999    
Other Noncurrent Liabilities 49,424 45,455    
Commitments and Contingencies (Note 14)    
Capitalization        
Long-Term Debt 79,900 79,849    
Total Shareholders' Equity 1,668,499 1,443,006    
Total Capitalization 1,748,399 1,522,855    
Total Liabilities and Shareholders' Equity 2,569,555 2,152,309    
OTC | Subsidiaries        
Current Assets        
Accounts Receivable from Subsidiaries 5,642 2,555    
Interest Receivable from Subsidiaries 117 117    
Notes Receivable from Subsidiaries 4,706 0    
Investments in Subsidiaries 2,006,239 1,725,584    
Notes Receivable from Subsidiaries 78,900 78,900    
Current Liabilities        
Accounts Payable to Subsidiaries 7 7    
Notes Payable to Subsidiaries $ 752,625 $ 568,672