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CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY - USD ($) $ in Thousands | Total | Common stock | Additional paid-in capital | Retained earnings | Accumulated other comprehensive income (loss), net of taxes | Treasury stock, at cost
--- | --- | --- | --- | --- | --- | ---
Beginning balance at Dec. 31, 2014 |  | $ 64 | $ 422,232 | $ 1,065,318 | $ 284,601 | $ (435,752)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Options exercised, 2017, 208,306 shares; 2016, 142,203 shares; 2015, 85,532 shares |  | 0 |  |  |  |
Conversion of common stock units, 2017, 15,981 shares; 2016, 15,629 shares; 2015, 8,293 shares |  | 0 |  |  |  |
Conversion of restricted stock units, 2017, 313,292 shares; 2016, 222,297 shares; 2015, 198,681 shares |  | 1 |  |  |  |
Options exercised and conversion of common stock units and restricted stock units |  |  | 13,605 |  |  |
Share-based compensation expense |  |  | 6,811 |  |  |
Net income | $ 93,482 |  |  | 93,482 |  |
Cash dividends, 2017, $1.10 per share; 2016, $1.06 per share; 2015, $1.00 per share |  |  |  | (42,523) |  |
Reclassification of deferred taxes |  |  |  | 0 | 0 |
Change in net unrealized investment gains and losses on fixed maturity and equity securities | (122,387) |  |  |  | (122,387) |
Change in net funded status of benefit plans | 1,159 |  |  |  | 1,159 |
Acquisition of shares, 2017, 48,440 shares; 2016, 701,410 shares; 2015, 663,092 shares |  |  |  |  |  | (21,950)
Ending balance at Dec. 31, 2015 | 1,264,661 | 65 | 442,648 | 1,116,277 | 163,373 | (457,702)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Options exercised, 2017, 208,306 shares; 2016, 142,203 shares; 2015, 85,532 shares |  | 0 |  |  |  |
Conversion of common stock units, 2017, 15,981 shares; 2016, 15,629 shares; 2015, 8,293 shares |  | 0 |  |  |  |
Conversion of restricted stock units, 2017, 313,292 shares; 2016, 222,297 shares; 2015, 198,681 shares |  | 0 |  |  |  |
Options exercised and conversion of common stock units and restricted stock units |  |  | 2,696 |  |  |
Share-based compensation expense |  |  | 8,135 |  |  |
Net income | 83,765 |  |  | 83,765 |  |
Cash dividends, 2017, $1.10 per share; 2016, $1.06 per share; 2015, $1.00 per share |  |  |  | (44,310) |  |
Reclassification of deferred taxes |  |  |  | 0 | 0 |
Change in net unrealized investment gains and losses on fixed maturity and equity securities | 571 |  |  |  | 571 |
Change in net funded status of benefit plans | (23) |  |  |  | (23) |
Acquisition of shares, 2017, 48,440 shares; 2016, 701,410 shares; 2015, 663,092 shares |  |  |  |  |  | (21,513)
Ending balance at Dec. 31, 2016 | 1,293,982 | 65 | 453,479 | 1,155,732 | 163,921 | (479,215)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Options exercised, 2017, 208,306 shares; 2016, 142,203 shares; 2015, 85,532 shares |  | 0 |  |  |  |
Conversion of common stock units, 2017, 15,981 shares; 2016, 15,629 shares; 2015, 8,293 shares |  | 0 |  |  |  |
Conversion of restricted stock units, 2017, 313,292 shares; 2016, 222,297 shares; 2015, 198,681 shares |  | 0 |  |  |  |
Options exercised and conversion of common stock units and restricted stock units |  |  | 2,962 |  |  |
Share-based compensation expense |  |  | 7,805 |  |  |
Net income | 169,459 |  |  | 169,459 |  |
Cash dividends, 2017, $1.10 per share; 2016, $1.06 per share; 2015, $1.00 per share |  |  |  | (46,114) |  |
Reclassification of deferred taxes | 47,900 |  |  | (47,900) | 47,900 |
Change in net unrealized investment gains and losses on fixed maturity and equity securities | 74,405 |  |  |  | 74,405 |
Change in net funded status of benefit plans | 734 |  |  |  | 734 |
Acquisition of shares, 2017, 48,440 shares; 2016, 701,410 shares; 2015, 663,092 shares |  |  |  |  |  | (1,660)
Ending balance at Dec. 31, 2017 | $ 1,501,573 | $ 65 | $ 464,246 | $ 1,231,177 | $ 286,960 | $ (480,875)

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