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Consolidated Statements Of Operations - USD ($)
$ 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
Revenues:                      
Net premiums earned $ 921,860 $ 899,304 $ 811,897 $ 922,574 $ 925,384 $ 915,012 $ 888,776 $ 870,245 $ 3,555,635 $ 3,599,418 $ 3,368,411
Net investment income                 134,858 141,263 135,838
Net realized investment gains (losses)                 85,731 222,793 (133,520)
Other                 8,287 9,044 9,275
Total revenues                 3,784,511 3,972,518 3,380,004
Expenses:                      
Losses and loss adjustment expenses                 2,395,343 2,706,024 2,576,789
Policy acquisition costs                 627,788 602,085 572,164
Other operating expenses                 285,831 269,305 244,630
Interest                 17,048 17,035 17,036
Total expenses                 3,326,010 3,594,449 3,410,619
Income (loss) before income taxes 207,110 146,631 285,466 (180,705) 28,465 80,840 101,595 167,169 458,501 378,069 (30,615)
Income tax expense (benefit)                 83,894 57,982 (24,887)
Net income (loss) $ 166,743 $ 118,857 $ 228,211 $ (139,204) $ 31,688 $ 69,282 $ 83,250 $ 135,867 $ 374,607 $ 320,087 $ (5,728)
Net income (loss) per share:                      
Basic (in dollars per share) $ 3.01 $ 2.15 $ 4.12 $ (2.51) $ 0.57 $ 1.25 $ 1.50 $ 2.46 $ 6.77 $ 5.78 $ (0.10)
Diluted (in dollars per share) $ 3.01 $ 2.15 $ 4.12 $ (2.51) $ 0.57 $ 1.25 $ 1.50 $ 2.45 $ 6.77 $ 5.78 $ (0.10)