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Quarterly Financial Information (Details) - USD ($)
$ / shares in Units, $ 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
Net premiums earned $ 704,899 $ 694,541 $ 630,671 $ 651,703 $ 668,359 $ 653,620 $ 642,619 $ 632,573 $ 2,681,814 $ 2,597,171 $ 2,436,229
Net investment income earned 68,511 68,185 34,444 55,967 57,594 55,826 58,505 50,618 227,107 222,543 195,336
Net realized and unrealized (losses) gains 20,079 7,721 12,649 (44,666) (873) (2,183) 4,027 13,451 (4,217) 14,422 (54,923)
Other income 4,943 6,119 4,683 1,825 3,820 3,162 3,053 2,320 17,570 12,355 9,438
Total revenues 798,432 776,566 682,447 664,829 728,900 710,425 708,204 698,962 2,922,274 2,846,491 2,586,080
Income before federal income tax 159,041 85,257 42,693 15,997 101,293 71,178 90,225 73,694 302,988 336,390 211,721
Net income 127,061 69,875 34,183 15,236 81,859 56,150 72,266 61,348 246,355 271,623 178,939
Net Income available to common stockholders $ 127,061 $ 69,875 $ 34,183 $ 15,236 $ 81,859 $ 56,150 $ 72,266 $ 61,348 $ 246,355 $ 271,623 $ 178,939
Basic net income per share $ 2.12 $ 1.17 $ 0.57 $ 0.26 $ 1.38 $ 0.94 $ 1.22 $ 1.04 $ 4.12 $ 4.57 $ 3.04
Diluted net income per share $ 2.10 $ 1.16 $ 0.57 $ 0.25 $ 1.36 $ 0.93 $ 1.21 $ 1.02 $ 4.09 $ 4.53 $ 3.00