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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, 2020
Dec. 31, 2019
Dec. 31, 2018
Operating Activities      
Net Cash Provided by Operating Activities $ 211,921 $ 185,037 $ 143,448
Investing Activities      
Investment in Subsidiaries (9,110) (10,626) (4,372)
Net Cash (Used in) Provided by Investing Activities (375,652) (209,472) (107,419)
Financing Activities      
Change in Checks Written in Excess of Cash 4,849 (2,814) (345)
Net Short-Term (Repayments) Borrowings 74,997 (12,599) (93,772)
Proceeds from Issuance of Common Stock 52,432 20,338 0
Common Stock Issuance Expenses (648) (577) (108)
Payments for Shares Withheld for Employee Tax Obligations (2,069) (2,730) (3,011)
Short-Term and Long-Term Debt Issuance Expenses (370) (950) (761)
Payments for Retirement of Long-Term Debt (182) (172) (189)
Dividends Paid (60,314) (55,723) (53,198)
Net Cash Used in Financing Activities 143,695 44,773 (51,384)
Cash and Cash Equivalents at Beginning of Period 21,199    
Cash and Cash Equivalents at End of Period 1,163 21,199  
OTC      
Operating Activities      
Net Cash Provided by Operating Activities 54,027 52,263 56,947
Investing Activities      
Investment in Subsidiaries (150,000) (34,990) (24,764)
Debt Repaid by Subsidiaries 182 1,338 774
Cash Used in Investing Activities (2,419) (257) (623)
Net Cash (Used in) Provided by Investing Activities (152,237) (33,909) (24,613)
Financing Activities      
Change in Checks Written in Excess of Cash 125 (31) 31
Net Short-Term (Repayments) Borrowings 59,166 (3,215) 9,215
Borrowings from (Repayments to) Subsidiaries 44,741 28,985 (1,281)
Proceeds from Issuance of Common Stock 52,432 20,338 0
Common Stock Issuance Expenses (648) (577) (108)
Payments for Shares Withheld for Employee Tax Obligations (2,069) (2,730) (3,011)
Short-Term and Long-Term Debt Issuance Expenses 0 (270) (164)
Payments for Retirement of Long-Term Debt (182) (172) (189)
Dividends Paid (60,314) (55,723) (53,198)
Net Cash Used in Financing Activities 93,251 (13,395) (48,705)
Cash and Cash Equivalents, Period Increase (Decrease) (4,959) 4,959 (16,371)
Cash and Cash Equivalents at Beginning of Period 4,959 0 16,371
Cash and Cash Equivalents at End of Period $ 0 $ 4,959 $ 0