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Schedule 1 - Condensed Financial Information of Registrant - Condensed Balance Sheets, Parent Company (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Assets        
Cash and Cash Equivalents $ 1,163 $ 21,199    
Receivables, net of allowance for credit losses 113,959 107,631    
Other Current Assets 5,645 6,529    
Total Current Assets 234,832 254,860    
Investments 51,856 45,374    
Other Noncurrent Assets 26,282 26,567    
Identifiable Assets 2,578,354 2,273,595    
Liabilities and Shareholders' Equity        
Short-Term Debt 80,997 6,000    
Current Maturities of Long-Term Debt 140,087 183    
Other Current Liabilities 22,495 15,048    
Total Current Liabilities 436,786 189,741    
Other Noncurrent Liabilities 60,002 51,911    
Capitalization        
Total Long-Term Debt Net of Unamortized Debt Issuance Costs 624,432 689,581    
Common Shareholder Equity 870,966 781,482 $ 728,863 $ 696,892
Total Capitalization 1,495,398 1,471,063    
Total Liabilities and Stockholders' Equity 2,578,354 2,273,595    
Commitments and Contingencies (Note 13)    
OTC        
Assets        
Cash and Cash Equivalents 0 4,959 $ 0 $ 16,371
Receivables, net of allowance for credit losses 148 0    
Accounts Receivable from Subsidiaries 2,734 2,144    
Interest Receivable from Subsidiaries 117 117    
Other Current Assets 1,063 2,537    
Total Current Assets 4,062 9,757    
Investments 1,061,009 860,646    
Notes Receivable from Subsidiaries 79,069 79,251    
Deferred Income Taxes 28,793 25,505    
Other Noncurrent Assets 40,848 36,140    
Identifiable Assets 1,213,781 1,011,299    
Liabilities and Shareholders' Equity        
Short-Term Debt 65,166 6,000    
Current Maturities of Long-Term Debt 169 183    
Accounts Payable to Subsidiaries 7 7    
Notes Payable to Subsidiaries 134,352 89,611    
Other Current Liabilities 12,931 9,629    
Total Current Liabilities 212,625 105,430    
Other Noncurrent Liabilities 50,495 44,575    
Capitalization        
Total Long-Term Debt Net of Unamortized Debt Issuance Costs 79,695 79,812    
Common Shareholder Equity 870,966 781,482    
Total Capitalization 950,661 861,294    
Total Liabilities and Stockholders' Equity 1,213,781 1,011,299    
Commitments and Contingencies (Note 13)