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Schedule 1 - Condensed Financial Information of Registrant - Condensed Balance Sheets, Parent Company (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | --- | --- | ---
Current Assets |  |  |  |
Cash and Cash Equivalents | $ 1,537 | $ 1,163 |  |
Receivables, net of allowance for credit losses | 174,953 | 113,959 |  |
Other Current Assets | 17,032 | 5,645 |  |
Total Current Assets | 369,354 | 234,832 |  |
Investments | 56,690 | 51,856 |  |
Other Noncurrent Assets | 32,057 | 26,282 |  |
Total Assets | 2,754,830 | 2,578,354 |  |
Current Liabilities |  |  |  |
Short-Term Debt | 91,163 | 80,997 |  |
Current Maturities of Long-Term Debt | 29,983 | 140,087 |  |
Other Current Liabilities | 55,671 | 32,139 |  |
Total Current Liabilities | 387,699 | 436,786 |  |
Other Noncurrent Liabilities | 62,527 | 60,002 |  |
Commitments and Contingencies (Note 13) |  |  |  |
Capitalization |  |  |  |
Total Long-Term Debt Net of Unamortized Debt Issuance Costs | 734,014 | 624,432 |  |
Common Stockholders' Equity | 990,777 | 870,966 | $ 781,482 | $ 728,863
Total Capitalization | 1,724,791 | 1,495,398 |  |
Total Liabilities and Shareholders' Equity | 2,754,830 | 2,578,354 |  |
OTC |  |  |  |
Current Assets |  |  |  |
Cash and Cash Equivalents | 3 | 0 |  |
Receivables, net of allowance for credit losses | 25 | 148 |  |
Accounts Receivable from Subsidiaries | 2,817 | 2,734 |  |
Interest Receivable from Subsidiaries | 117 | 117 |  |
Current Notes Receivable | 6,767 | 0 |  |
Other Current Assets | 1,410 | 1,063 |  |
Total Current Assets | 11,139 | 4,062 |  |
Investments | 1,184,564 | 1,061,009 |  |
Notes Receivable from Subsidiaries | 78,900 | 79,069 |  |
Deferred Income Taxes | 29,619 | 28,793 |  |
Other Noncurrent Assets | 44,749 | 40,848 |  |
Total Assets | 1,348,971 | 1,213,781 |  |
Current Liabilities |  |  |  |
Short-Term Debt | 22,637 | 65,166 |  |
Current Maturities of Long-Term Debt | 0 | 169 |  |
Accounts Payable to Subsidiaries | 181 | 7 |  |
Notes Payable to Subsidiaries | 190,204 | 134,352 |  |
Other Current Liabilities | 14,526 | 12,931 |  |
Total Current Liabilities | 227,548 | 212,625 |  |
Other Noncurrent Liabilities | 50,900 | 50,495 |  |
Commitments and Contingencies (Note 13) |  |  |  |
Capitalization |  |  |  |
Total Long-Term Debt Net of Unamortized Debt Issuance Costs | 79,746 | 79,695 |  |
Common Stockholders' Equity | 990,777 | 870,966 |  |
Total Capitalization | 1,070,523 | 950,661 |  |
Total Liabilities and Shareholders' Equity | $ 1,348,971 | $ 1,213,781 |  |

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