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Schedule II Condensed Financial Information of Registrant - Condensed Balance Sheet (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | --- | ---
ASSETS |  |  |
Other assets | $ 381,182 | $ 321,874 |
Total assets | 11,198,340 | 10,576,824 | $ 10,056,972
LIABILITIES AND SHAREHOLDERS' EQUITY |  |  |
Long-term debt | 297,469 | 247,209 |
Other liabilities | 341,053 | 378,620 |
Total liabilities | 9,696,767 | 9,282,842 |
Preferred stock, $0.001 par value, authorized 1,000,000 shares; none issued | 0 | 0 |
Common stock, $0.001 par value, authorized 75,000,000 shares; issued, 2017, 65,439,245; 2016, 64,917,683 | 65 | 65 |
Additional paid-in capital | 464,246 | 453,479 |
Retained earnings | 1,231,177 | 1,155,732 |
Accumulated other comprehensive income (loss), net of taxes: |  |  |
Net unrealized investment gains on fixed maturity and equity securities | 300,177 | 175,738 |
Net funded status of pension benefit obligations | (13,217) | (11,817) |
Treasury stock, at cost, 2017, 24,721,372 shares; 2016, 24,672,932 shares | (480,875) | (479,215) |
Total shareholders' equity | 1,501,573 | 1,293,982 | $ 1,264,661
Total liabilities and shareholders' equity | 11,198,340 | 10,576,824 |
Parent Company [Member] |  |  |
ASSETS |  |  |
Investments and cash | 6,464 | 4,069 |
Investment in subsidiaries | 1,685,390 | 1,487,457 |
Other assets | 66,445 | 60,057 |
Total assets | 1,758,299 | 1,551,583 |
LIABILITIES AND SHAREHOLDERS' EQUITY |  |  |
Long-term debt | 247,469 | 247,209 |
Other liabilities | 9,257 | 10,392 |
Total liabilities | 256,726 | 257,601 |
Preferred stock, $0.001 par value, authorized 1,000,000 shares; none issued | 0 | 0 |
Common stock, $0.001 par value, authorized 75,000,000 shares; issued, 2017, 65,439,245; 2016, 64,917,683 | 65 | 65 |
Additional paid-in capital | 464,246 | 453,479 |
Retained earnings | 1,231,177 | 1,155,732 |
Accumulated other comprehensive income (loss), net of taxes: |  |  |
Net unrealized investment gains on fixed maturity and equity securities | 300,177 | 175,738 |
Net funded status of pension benefit obligations | (13,217) | (11,817) |
Treasury stock, at cost, 2017, 24,721,372 shares; 2016, 24,672,932 shares | (480,875) | (479,215) |
Total shareholders' equity | 1,501,573 | 1,293,982 |
Total liabilities and shareholders' equity | $ 1,758,299 | $ 1,551,583 |

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