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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, 2023	Dec. 31, 2022	Dec. 31, 2021
Cash Flows from Operating Activities
Net Cash Provided by Operating Activities	$ 404,499	$ 389,309	$ 231,243
Cash Flows from Investing Activities
Investment in Subsidiaries	(8,378)	(8,283)	(9,383)
Net Cash Used in Investing Activities	(289,287)	(175,071)	(171,510)
Cash Flows from Financing Activities
Net (Repayments) Borrowings on Short-Term Debt	73,218	(82,959)	10,166
Proceeds from Issuance of Common Stock	0	0	696
Payments for Shares Withheld for Employee Tax Obligations	(3,088)	(2,942)	(1,507)
Payments for Retirement of Long-Term Debt	0	(30,000)	(140,169)
Dividends Paid	(73,061)	(68,755)	(64,864)
Other, net	(904)	(2,123)	(3,681)
Net Cash Used in Financing Activities	(3,835)	(96,779)	(59,359)
Net Change in Cash and Cash Equivalents	111,377	117,459	374
Cash and Cash Equivalents at Beginning of Period	118,996	1,537	1,163
Cash and Cash Equivalents at End of Period	230,373	118,996	1,537
OTC
Cash Flows from Operating Activities
Net Cash Provided by Operating Activities	77,139	28,807	60,695
Cash Flows from Investing Activities
Other, net	(68)	(1,695)	(884)
Net Cash Used in Investing Activities	(40,068)	(51,695)	(715)
Cash Flows from Financing Activities
Net (Repayments) Borrowings on Short-Term Debt	0	(22,637)	(42,529)
Borrowings from Subsidiaries	148,308	236,926	49,085
Proceeds from Issuance of Common Stock	0	0	696
Payments for Shares Withheld for Employee Tax Obligations	(3,088)	(2,942)	(1,507)
Payments for Retirement of Long-Term Debt	0	0	(169)
Dividends Paid	(73,061)	(68,755)	(64,864)
Other, net	(339)	(461)	(689)
Net Cash Used in Financing Activities	71,820	142,131	(59,977)
Net Change in Cash and Cash Equivalents	108,891	119,243	3
Cash and Cash Equivalents at Beginning of Period	119,246	3	0
Cash and Cash Equivalents at End of Period	228,137	119,246	3
OTC | Subsidiaries
Cash Flows from Investing Activities
Investment in Subsidiaries	(40,000)	(50,000)	0
Debt Repaid by Subsidiaries	$ 0	$ 0	$ 169

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