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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 tax: | Treasury stock, at cost
--- | --- | --- | --- | --- | --- | ---
Beginning balance at Dec. 31, 2015 |  | $ 65 | $ 442,648 | $ 1,116,277 | $ 163,373 | $ (457,702)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Options exercised, 2018, 145,438 shares; 2017, 208,306 shares; 2016, 142,203 shares |  | 0 |  |  |  |
Conversion of common stock units, 2018, 30,368 shares; 2017, 15,981 shares; 2016, 15,629 shares |  | 0 |  |  |  |
Conversion of restricted common stock units, 2018, 212,382 shares; 2017, 313,292 shares; 2016, 222,297 shares |  | 0 |  |  |  |
Options exercised and conversion of common stock units and restricted common stock units |  |  | 2,696 |  |  |
Share-based compensation expense |  |  | 8,135 |  |  |
Net income | $ 83,765 |  |  | 83,765 |  |
Cash dividends, 2018, $1.14 per share; 2017, $1.10 per share; 2016, $1.06 per share |  |  |  | (44,310) |  |
Reclassification of deferred taxes |  |  |  | 0 | 0 |
Cumulative effect of change in accounting principle | 0 |  |  | 0 | 0 |
Change in unrealized investment gains (losses) on securities | 571 |  |  |  | 571 |
Change in net funded status of benefit plans | (23) |  |  |  | (23) |
Acquisition of shares, 2018, 129,112 shares; 2017, 48,440 shares; 2016, 701,410 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, 2018, 145,438 shares; 2017, 208,306 shares; 2016, 142,203 shares |  | 0 |  |  |  |
Conversion of common stock units, 2018, 30,368 shares; 2017, 15,981 shares; 2016, 15,629 shares |  | 0 |  |  |  |
Conversion of restricted common stock units, 2018, 212,382 shares; 2017, 313,292 shares; 2016, 222,297 shares |  | 0 |  |  |  |
Options exercised and conversion of common stock units and restricted common stock units |  |  | 2,962 |  |  |
Share-based compensation expense |  |  | 7,805 |  |  |
Net income | 169,459 |  |  | 169,459 |  |
Cash dividends, 2018, $1.14 per share; 2017, $1.10 per share; 2016, $1.06 per share |  |  |  | (46,114) |  |
Reclassification of deferred taxes | 47,900 |  |  | (47,900) | 47,900 |
Cumulative effect of change in accounting principle | 0 |  |  | 0 | 0 |
Change in unrealized investment gains (losses) on securities | 74,405 |  |  |  | 74,405 |
Change in net funded status of benefit plans | 734 |  |  |  | 734 |
Acquisition of shares, 2018, 129,112 shares; 2017, 48,440 shares; 2016, 701,410 shares |  |  |  |  |  | (1,660)
Ending balance at Dec. 31, 2017 | 1,501,573 | 65 | 464,246 | 1,231,177 | 286,960 | (480,875)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Options exercised, 2018, 145,438 shares; 2017, 208,306 shares; 2016, 142,203 shares |  | 0 |  |  |  |
Conversion of common stock units, 2018, 30,368 shares; 2017, 15,981 shares; 2016, 15,629 shares |  | 0 |  |  |  |
Conversion of restricted common stock units, 2018, 212,382 shares; 2017, 313,292 shares; 2016, 222,297 shares |  | 1 |  |  |  |
Options exercised and conversion of common stock units and restricted common stock units |  |  | 3,008 |  |  |
Share-based compensation expense |  |  | 7,855 |  |  |
Net income | 18,343 |  |  | 18,343 |  |
Cash dividends, 2018, $1.14 per share; 2017, $1.10 per share; 2016, $1.06 per share |  |  |  | (47,979) |  |
Reclassification of deferred taxes |  |  |  | 0 | 0 |
Cumulative effect of change in accounting principle | (15,041) |  |  | 15,041 | (15,041) |
Change in unrealized investment gains (losses) on securities | (188,195) |  |  |  | (188,195) |
Change in net funded status of benefit plans | 1,032 |  |  |  | 1,032 |
Acquisition of shares, 2018, 129,112 shares; 2017, 48,440 shares; 2016, 701,410 shares |  |  |  |  |  | (5,088)
Ending balance at Dec. 31, 2018 | $ 1,290,550 | $ 66 | $ 475,109 | $ 1,216,582 | $ 84,756 | $ (485,963)

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