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Quarterly Financial Information (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Tax Reform Deferred Tax Asset Impact                 $ 0 $ 20,205 $ 0
Net premiums earned $ 625,288 [1] $ 614,277 $ 604,836 $ 591,828 $ 590,088 [1] $ 572,055 $ 568,030 $ 560,854 2,436,229 2,291,027 2,149,572
Net investment income earned 54,109 [1] 52,443 45,553 43,231 42,587 [1] 40,446 41,430 37,419 195,336 161,882 130,754
Net realized and unrealized (losses) gains2 (37,935) [1],[2] (4,787) [2] (1,652) [2] (10,549) [2] (1,128) [1],[2] 6,798 [2] 1,734 [2] (1,045) [2] (54,923) 6,359 (4,937)
Other income 1,542 [1] 2,538 3,179 2,179 2,190 [1] 1,994 3,291 3,241 9,438 10,716 8,881
Total revenues 643,004 [1] 664,471 651,916 626,689 633,737 [1] 621,293 614,485 600,469 2,586,080 2,469,984 2,284,270
Income before federal income tax 52,135 67,130 72,525 19,931 68,150 67,315 58,929 67,574 211,721 261,968 219,955
Net income $ 45,760 [1] $ 55,435 $ 58,819 $ 18,925 $ 30,242 [1] $ 46,718 $ 41,426 $ 50,440 $ 178,939 $ 168,826 $ 158,495
Basic net income per share $ 0.77 [1] $ 0.94 $ 1.00 $ 0.32 $ 0.52 [1] $ 0.80 $ 0.71 $ 0.87 $ 3.04 $ 2.89 $ 2.74
Diluted net income per share $ 0.76 [1] $ 0.93 $ 0.99 $ 0.32 $ 0.51 [1] $ 0.79 $ 0.70 $ 0.85 $ 3.00 $ 2.84 $ 2.70
[1] Results for the fourth quarter of 2017 include the impact of the $20.2 million write off of deferred tax assets required with the implementation of Tax Reform. See Note 13. "Federal Income Taxes" above for additional information.
[2] Effective January 1, 2018, changes in unrealized gains and losses on our equity portfolio are recognized in income through "Net unrealized losses on equity securities" on our Consolidated Statements of Income, as a result of our adoption of ASU 2016-01. See Note 3. "Adoption of Accounting Pronouncements" above.