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SCHEDULE I - CONDENSED FINANCIAL INFORMATION OF PARENT 2 (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Condensed financial statements                      
Income tax expense                 $ 28,197 $ 24,670 $ 18,017
Net Income $ 20,211 $ 26,530 $ 25,612 $ 14,072 $ 16,700 $ 28,006 $ 26,784 $ 12,852 $ 86,425 $ 84,342 $ 63,871
Weighted Average Number of Shares Outstanding (in shares)                 36,880 36,814 36,733
Earnings Per Share, Basic $ 0.55 $ 0.72 $ 0.69 $ 0.38 $ 0.45 $ 0.76 $ 0.72 $ 0.35 $ 2.34 $ 2.28 $ 1.73
Weighted Average Number of Diluted Common Shares Outstanding                 36,995 36,964 36,936
Earnings Per Share, Diluted $ 0.54 $ 0.72 $ 0.69 $ 0.38 $ 0.45 $ 0.76 $ 0.72 $ 0.35 $ 2.33 $ 2.28 $ 1.72
Dividends Paid Per Common Share                 $ 1.28 $ 1.16 $ 1.06
Parent Company                      
Condensed financial statements                      
Operating revenues and other income                 $ 0 $ 0 $ 0
Operating Expenses and Other Expenses                 90 314 305
Operating income / (loss)                 (90) (314) (305)
Equity in earnings of subsidiaries                 86,307 83,947 63,651
Closed Block Operations, Results before Income Taxes                 86,217 83,633 63,346
Income tax expense                 (208) (709) (525)
Net Income                 $ 86,425 $ 84,342 $ 63,871
Earnings Per Share, Basic                 $ 2.34 $ 2.28 $ 1.73
Earnings Per Share, Diluted                 2.33 2.28 1.72
Dividends Paid Per Common Share                 $ 1.280 $ 1.160 $ 1.060