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Schedule II. Condensed Financial Information of Registrant - Condensed Balance Sheets (Detail) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | --- | --- | ---
Assets |  |  |  |
Equity securities | $ 9,282 | $ 33 |  |
Short-term investments | 25,770 | 29,580 |  |
Other investments |  | 13,330 |  |
Total investments | 1,130,314 | 1,084,474 |  |
Cash and cash equivalents | 55,559 | 58,936 | $ 69,481 | $ 90,956
Deferred income taxes | 19,262 | 33,811 |  |
Property and equipment, net | 6,128 | 6,636 |  |
Federal income tax recoverable | 1,761 |  |  |
Other assets | 9,959 | 37,668 |  |
Total assets | 1,518,236 | 1,518,856 |  |
Liabilities, redeemable preferred stock and shareholders’ equity |  |  |  |
Total liabilities | 1,092,813 | 1,062,706 |  |
Shareholders' equity (net of Treasury stock of $22,370 at December 31, 2017 and 2016) | 425,423 | 456,150 | 453,981 | 446,968
Total liabilities and shareholders’ equity | 1,518,236 | 1,518,856 |  |
Parent Company [Member] |  |  |  |
Assets |  |  |  |
Equity securities | 9,248 |  |  |
Short-term investments | 7,962 | 11,939 |  |
Other investments |  | 13,330 |  |
Investment in subsidiaries | 386,844 | 415,767 |  |
Total investments | 404,054 | 441,036 |  |
Cash and cash equivalents | 16,351 | 9,596 | $ 26,968 | $ 43,585
Deferred income taxes | 302 | 675 |  |
Notes receivable from subsidiaries | 1,711 | 1,587 |  |
Property and equipment, net | 1,359 | 1,942 |  |
Federal income tax recoverable | 3,525 | 3,091 |  |
Other assets | 887 | 657 |  |
Total assets | 428,189 | 458,584 |  |
Liabilities, redeemable preferred stock and shareholders’ equity |  |  |  |
Total liabilities | 2,766 | 2,434 |  |
Shareholders' equity (net of Treasury stock of $22,370 at December 31, 2017 and 2016) | 425,423 | 456,150 |  |
Total liabilities and shareholders’ equity | $ 428,189 | $ 458,584 |  |

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