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Schedule I - Condensed Financial Information of Registrant - Condensed Balance Sheets, Parent Company (Details) - USD ($)
$ in Thousands
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Current Assets        
Cash and Cash Equivalents $ 118,996 $ 1,537    
Receivables, net of allowance for credit losses 144,393 174,953    
Other Current Assets 18,412 17,032    
Total Current Assets 452,752 369,354    
Investments 54,845 56,690    
Other Noncurrent Assets 41,177 32,057    
Total Assets 2,901,661 2,754,830    
Current Liabilities        
Short-Term Debt 8,204 91,163    
Current Maturities of Long-Term Debt 0 29,983    
Other Current Liabilities 56,065 55,671    
Total Current Liabilities 237,636 387,699    
Other Noncurrent Liabilities 60,985 62,527    
Commitments and Contingencies (Note 13)    
Capitalization        
Total Long-Term Debt Net of Unamortized Debt Issuance Costs 823,821 734,014    
Common Stockholders' Equity 1,217,317 990,777 $ 870,966 $ 781,482
Total Capitalization 2,041,138 1,724,791    
Total Liabilities and Shareholders' Equity 2,901,661 2,754,830    
OTC        
Current Assets        
Cash and Cash Equivalents 119,246 3    
Receivables, net of allowance for credit losses 0 25    
Accounts Receivable from Subsidiaries 3,278 2,817    
Interest Receivable from Subsidiaries 117 117    
Current Notes Receivable 0 6,767    
Other Current Assets 1,045 1,410    
Total Current Assets 123,686 11,139    
Investments 1,463,998 1,184,564    
Notes Receivable from Subsidiaries 78,900 78,900    
Deferred Income Taxes 64,802 29,619    
Other Noncurrent Assets 43,779 44,749    
Total Assets 1,775,165 1,348,971    
Current Liabilities        
Short-Term Debt 0 22,637    
Current Maturities of Long-Term Debt 0 0    
Accounts Payable to Subsidiaries 7 181    
Notes Payable to Subsidiaries 420,363 190,204    
Other Current Liabilities 15,994 14,526    
Total Current Liabilities 436,364 227,548    
Other Noncurrent Liabilities 41,686 50,900    
Commitments and Contingencies (Note 13)    
Capitalization        
Total Long-Term Debt Net of Unamortized Debt Issuance Costs 79,798 79,746    
Common Stockholders' Equity 1,217,317 990,777    
Total Capitalization 1,297,115 1,070,523    
Total Liabilities and Shareholders' Equity $ 1,775,165 $ 1,348,971