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Unaudited Quarterly Financial Data - Unaudited Quarterly Financial Data (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
Quarterly Financial Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Direct premiums | $ 673,605 | $ 670,222 | $ 667,191 | $ 656,087 | $ 650,906 | $ 646,079 | $ 637,426 | $ 627,698 | $ 2,667,104 | $ 2,562,109 | $ 2,444,268
Ceded premiums | (392,290) | (391,175) | (403,449) | (394,249) | (397,318) | (397,641) | (406,043) | (399,769) | (1,581,164) | (1,600,771) | (1,600,559)
Net premiums | 281,315 | 279,047 | 263,742 | 261,838 | 253,588 | 248,438 | 231,383 | 227,929 | 1,085,940 | 961,338 | 843,709
Revenues | 487,325 | 484,781 | 467,815 | 459,923 | 442,942 | 427,300 | 413,696 | 405,164 | 1,899,843 | 1,689,102 | 1,519,084
Net investment income | 21,760 | 20,622 | 20,030 | 19,017 | 19,459 | 19,922 | 19,742 | 19,894 | 81,430 | 79,017 | 79,025
Realized investment gains (losses), including OTTI | (1,651) | (126) | 1,313 | (1,656) | 1,079 | 22 | 104 | 134 | (2,121) | 1,339 | 4,088
Other, net | 13,941 | 14,359 | 14,790 | 13,897 | 14,711 | 14,291 | 14,150 | 12,939 | 56,987 | 56,091 | 50,576
Total benefits and expenses | 379,403 | 373,346 | 354,050 | 376,960 | 334,853 | 327,100 | 317,307 | 330,322 | 1,483,759 | 1,309,582 | 1,181,489
Income before income taxes | 107,922 | 111,435 | 113,765 | 82,963 | 108,089 | 100,200 | 96,389 | 74,842 | 416,084 | 379,520 | 337,595
Income taxes | 21,381 | 26,296 | 27,065 | 17,248 | (60,354) | 33,565 | 33,282 | 22,772 | 91,990 | 29,265 | 118,181
Net income | $ 86,541 | $ 85,139 | $ 86,700 | $ 65,715 | $ 168,443 | $ 66,635 | $ 63,107 | $ 52,070 | $ 324,094 | $ 350,255 | $ 219,414
Earnings per share: |  |  |  |  |  |  |  |  |  |  |
Basic earnings per share | $ 1.99 | $ 1.95 | $ 1.96 | $ 1.46 | $ 3.73 | $ 1.46 | $ 1.36 | $ 1.12 | $ 7.35 | $ 7.63 | $ 4.59
Diluted earnings per share | $ 1.99 | $ 1.94 | $ 1.95 | $ 1.46 | $ 3.72 | $ 1.46 | $ 1.36 | $ 1.11 | $ 7.33 | $ 7.61 | $ 4.59
Commissions and Fees [Member] |  |  |  |  |  |  |  |  |  |  |
Quarterly Financial Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues | $ 171,960 | $ 170,879 | $ 167,940 | $ 166,827 | $ 154,105 | $ 144,627 | $ 148,317 | $ 144,268 | $ 677,607 | $ 591,317 | $ 541,686

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