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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 |  |

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