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Schedule II - Condensed Financial Information of Registrant - Condensed Statements of Income (Detail) - USD ($) $ 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
PREMIUMS EARNED AND OTHER REVENUES |  |  |  |  |  |  |  |  |  |  |
Net investment income | $ 7,603 | $ 6,642 | $ 5,786 | $ 4,785 | $ 4,448 | $ 3,085 | $ 3,223 | $ 2,704 | $ 24,816 | $ 13,460 | $ 9,540
Net realized gains (losses) on sale of securities |  |  |  |  |  |  |  |  | (2,089) | 2,570 | 2,294
Net change in unrealized gains (losses) of equity securities | (8,000) |  |  |  |  |  |  |  | (17,169) | 0 | 0
Other revenue |  |  |  |  |  |  |  |  | 7,163 | 7,002 | 6,426
Total premiums earned and other revenues | 216,373 | 206,155 | 209,788 | 191,500 | 201,312 | 190,243 | 185,487 | 174,874 | 823,816 | 751,916 | 685,289
OPERATING COSTS AND EXPENSES |  |  |  |  |  |  |  |  |  |  |
General and administrative expenses |  |  |  |  |  |  |  |  | 256,488 | 231,004 | 221,177
Total operating costs and expenses | 227,614 | 154,988 | 148,540 | 139,801 | 142,721 | 173,644 | 137,564 | 127,503 | 670,943 | 581,432 | 522,406
INCOME BEFORE INCOME TAXES |  |  |  |  |  |  |  |  | 152,873 | 170,484 | 162,883
Benefit from income taxes |  |  |  |  |  |  |  |  | 35,822 | 63,549 | 63,473
NET INCOME | $ (6,468) | $ 37,380 | $ 46,084 | $ 40,055 | $ 36,396 | $ 9,964 | $ 29,376 | $ 31,199 | 117,051 | 106,935 | 99,410
Parent Company |  |  |  |  |  |  |  |  |  |  |
PREMIUMS EARNED AND OTHER REVENUES |  |  |  |  |  |  |  |  |  |  |
Net investment income |  |  |  |  |  |  |  |  | 1,635 | 259 | (35)
Net realized gains (losses) on sale of securities |  |  |  |  |  |  |  |  | 0 | 255 | 667
Net change in unrealized gains (losses) of equity securities |  |  |  |  |  |  |  |  | (2,648) | 0 | 0
Management fee |  |  |  |  |  |  |  |  | 157 | 151 | 138
Other revenue |  |  |  |  |  |  |  |  | 0 | 12 | 80
Total premiums earned and other revenues |  |  |  |  |  |  |  |  | (856) | 677 | 850
OPERATING COSTS AND EXPENSES |  |  |  |  |  |  |  |  |  |  |
General and administrative expenses |  |  |  |  |  |  |  |  | 32,063 | 30,819 | 35,342
Total operating costs and expenses |  |  |  |  |  |  |  |  | 32,063 | 30,819 | 35,342
INCOME BEFORE INCOME TAXES |  |  |  |  |  |  |  |  | (32,919) | (30,142) | (34,492)
Benefit from income taxes |  |  |  |  |  |  |  |  | (10,434) | (18,296) | (12,055)
LOSS BEFORE EQUITY IN NET EARNINGS OF SUBSIDIARIES |  |  |  |  |  |  |  |  | (22,485) | (11,846) | (22,437)
Equity in net income of subsidiaries |  |  |  |  |  |  |  |  | 139,987 | 118,781 | 121,847
NET INCOME |  |  |  |  |  |  |  |  | $ 117,502 | $ 106,935 | $ 99,410

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