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Schedule I - Condensed Financial Information of Registrant - Condensed Statements of Cash Flows, Parent Company (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Operating Activities      
Net Cash Provided by Operating Activities $ 389,309 $ 231,243 $ 211,921
Investing Activities      
Investment in Subsidiaries (8,283) (9,383) (9,110)
Net Cash Used in Investing Activities (175,071) (171,510) (375,652)
Financing Activities      
Net (Repayments) Borrowings on Short-Term Debt (82,959) 10,166 74,997
Proceeds from Issuance of Common Stock 0 696 52,432
Payments for Shares Withheld for Employee Tax Obligations (2,942) (1,507) (2,069)
Payments for Retirement of Long-Term Debt (30,000) (140,169) (182)
Dividends Paid (68,755) (64,864) (60,314)
Other, net (2,123) (3,681) 3,831
Net Cash (Used in) Provided by Financing Activities (96,779) (59,359) 143,695
Net Change in Cash and Cash Equivalents 117,459 374 (20,036)
Cash and Cash Equivalents at Beginning of Period 1,537 1,163 21,199
Cash and Cash Equivalents at End of Period 118,996 1,537 1,163
OTC      
Operating Activities      
Net Cash Provided by Operating Activities 28,807 60,695 54,027
Investing Activities      
Investment in Subsidiaries (50,000) 0 (150,000)
Debt Repaid by Subsidiaries 0 169 182
Other, net (1,695) (884) (2,419)
Net Cash Used in Investing Activities (51,695) (715) (152,237)
Financing Activities      
Net (Repayments) Borrowings on Short-Term Debt (22,637) (42,529) 59,166
Borrowings from Subsidiaries 236,926 49,085 44,741
Proceeds from Issuance of Common Stock 0 696 52,432
Payments for Shares Withheld for Employee Tax Obligations (2,942) (1,507) (2,069)
Payments for Retirement of Long-Term Debt 0 (169) (182)
Dividends Paid (68,755) (64,864) (60,314)
Other, net (461) (689) (523)
Net Cash (Used in) Provided by Financing Activities 142,131 (59,977) 93,251
Net Change in Cash and Cash Equivalents 119,243 3 (4,959)
Cash and Cash Equivalents at Beginning of Period 3 0 4,959
Cash and Cash Equivalents at End of Period $ 119,246 $ 3 $ 0