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SCHEDULE I - CONDENSED FINANCIAL INFORMATION OF PARENT 2 (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Condensed financial statements      
Income Tax Expense (Benefit) $ 30,423 $ 28,197 $ 24,670
Net Income $ 94,347 $ 86,425 $ 84,342
Weighted Average Number of Shares Outstanding (in shares) 36,921 36,880 36,814
Basic Earnings Per Common Share (in USD per share) $ 2.55 $ 2.34 $ 2.28
Weighted Average Number of Diluted Common Shares Outstanding (in shares) 37,010 36,995 36,964
Fully Diluted Earnings per Common Share (in USD per share) $ 2.55 $ 2.33 $ 2.28
Dividends Paid Per Common Share (in USD per share) $ 1.40 $ 1.28 $ 1.16
Parent Company      
Condensed financial statements      
Operating revenues and other income $ 0 $ 0 $ 0
Operating expenses and other expenses 542 90 314
Operating expenses and other expenses (542) (90) (314)
Equity in earnings of subsidiaries 94,808 86,307 83,947
Income before income taxes 94,266 86,217 83,633
Income Tax Expense (Benefit) (81) (208) (709)
Net Income $ 94,347 $ 86,425 $ 84,342
Basic Earnings Per Common Share (in USD per share) $ 2.55 $ 2.34 $ 2.28
Fully Diluted Earnings per Common Share (in USD per share) 2.55 2.33 2.28
Dividends Paid Per Common Share (in USD per share) $ 1.40 $ 1.28 $ 1.16