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Schedule 1 - Condensed Financial Information of Registrant - Condensed Statements of Cash Flows, Parent Company (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Operating Activities
Net Cash Provided by Operating Activities	$ 231,243	$ 211,921	$ 185,037
Investing Activities
Investment in Subsidiaries	(9,383)	(9,110)	(10,626)
Net Cash Used in Investing Activities	(171,510)	(375,652)	(209,472)
Financing Activities
Net (Repayments) Borrowings on Short-Term Debt	10,166	74,997	(12,599)
Proceeds from Issuance of Common Stock	696	52,432	20,338
Payments for Retirement of Long-Term Debt	(140,169)	(182)	(172)
Dividends Paid	(64,864)	(60,314)	(55,723)
Other, net	(3,681)	3,831	(4,341)
Net Cash (Used in) Provided by Financing Activities	(59,359)	143,695	44,773
Net Change in Cash and Cash Equivalents	374	(20,036)	20,338
Cash and Cash Equivalents at Beginning of Period	1,163	21,199	861
Cash and Cash Equivalents at End of Period	1,537	1,163	21,199
OTC
Operating Activities
Net Cash Provided by Operating Activities	60,695	54,027	52,263
Investing Activities
Investment in Subsidiaries	0	(150,000)	(34,990)
Debt Repaid by Subsidiaries	169	182	1,338
Cash Used in Investing Activities	(884)	(2,419)	(257)
Net Cash Used in Investing Activities	(715)	(152,237)	(33,909)
Financing Activities
Net (Repayments) Borrowings on Short-Term Debt	(42,529)	59,166	(3,215)
Borrowings from Subsidiaries	49,085	44,741	28,985
Proceeds from Issuance of Common Stock	696	52,432	20,338
Payments for Shares Withheld for Employee Tax Obligations	(1,507)	(2,069)	(2,730)
Payments for Retirement of Long-Term Debt	(169)	(182)	(172)
Dividends Paid	(64,864)	(60,314)	(55,723)
Other, net	(689)	(523)	(878)
Net Cash (Used in) Provided by Financing Activities	(59,977)	93,251	(13,395)
Net Change in Cash and Cash Equivalents	3	(4,959)	4,959
Cash and Cash Equivalents at Beginning of Period	0	4,959	0
Cash and Cash Equivalents at End of Period	$ 3	$ 0	$ 4,959

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