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Schedule VI - Supplemental Information Concerning Consolidated Property and Casualty Insurance Operations (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
SEC Schedule, 12-18, Supplemental Information, Property-Casualty Insurance Underwriters [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Reserves for Unpaid Losses and LAE | $ 267,760 |  |  |  | $ 472,829 |  |  |  | $ 267,760 | $ 472,829 | $ 248,425 | $ 58,494
Incurred Loss and LAE Current Year |  |  |  |  |  |  |  |  | 515,338 | 314,933 | 322,929 |
Incurred Loss and LAE Prior Years |  |  |  |  |  |  |  |  | 88,068 | 99,522 | 27,499 |
Paid Losses and LAE |  |  |  |  |  |  |  |  | 538,331 | 401,011 | 342,796 |
Net Investment Income | 7,578 | $ 7,613 | $ 7,410 | $ 8,142 | 7,603 | $ 6,642 | $ 5,786 | $ 4,785 | 30,743 | 24,816 | 13,460 |
Deferred Policy Acquisition Cost (“DPAC”) | 91,882 |  |  |  | 84,686 |  |  |  | 91,882 | 84,686 | 73,059 | $ 64,912
Amortization of DPAC, Net |  |  |  |  |  |  |  |  | (176,843) | (163,187) | (136,702) |
Net Premiums Written |  |  |  |  |  |  |  |  | 869,645 | 827,674 | 737,060 |
Net Premiums Earned | 215,819 | $ 206,599 | $ 210,357 | $ 209,727 | 204,595 | $ 188,938 | $ 192,272 | $ 182,577 | 842,502 | 768,382 | 688,793 |
Unearned premiums | $ 661,279 |  |  |  | $ 601,679 |  |  |  | $ 661,279 | $ 601,679 | $ 532,444 |

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