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Quarterly Financial Information (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Net premiums earned $ 590,088 $ 572,055 $ 568,030 $ 560,854 $ 552,753 $ 542,429 $ 531,932 $ 522,458 $ 2,291,027 $ 2,149,572 $ 1,989,909
Net investment income earned 42,587 40,446 41,430 37,419 35,428 33,375 31,182 30,769 161,882 130,754 121,316
Net realized (losses) gains (1,128) 6,798 1,734 (1,045) (7,686) 3,688 1,765 (2,704) 11,204 3,562 31,537
Other income 2,190 1,994 3,291 3,241 1,863 2,199 3,868 951 10,716 8,881 7,456
Total revenues 633,737 621,293 614,485 600,469 582,358 581,691 568,747 551,474 2,469,984 2,284,270 2,131,852
Income before federal income tax 68,150 67,315 58,929 67,574 50,326 55,443 62,311 51,875 261,968 219,955 232,692
Net income $ 30,242 $ 46,718 $ 41,426 $ 50,440 $ 39,360 $ 38,502 $ 43,601 $ 37,032 $ 168,826 $ 158,495 $ 165,861
Basic net income per share $ 0.52 $ 0.80 $ 0.71 $ 0.87 $ 0.68 $ 0.66 $ 0.75 $ 0.64 $ 2.89 $ 2.74 $ 2.90
Diluted net income per share $ 0.51 $ 0.79 $ 0.70 $ 0.85 $ 0.67 $ 0.66 $ 0.74 $ 0.63 $ 2.84 $ 2.70 $ 2.85