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CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY (UNAUDITED) - USD ($) $ in Thousands | Total | Common stock | Additional paid-in capital | Retained earnings | Accumulated other comprehensive income, net of tax | Treasury stock, at cost
--- | --- | --- | --- | --- | --- | ---
Beginning balance at Dec. 31, 2016 |  | $ 65 | $ 453,479 | $ 1,155,732 | $ 163,921 | $ (479,215)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Options exercised, 2018, 56,614 shares; 2017, 33,764 shares |  | 0 |  |  |  |
Conversion of common stock units, 2018, 11,804 shares; 2017, 15,981 shares |  | 0 |  |  |  |
Conversion of restricted stock units, 2018, 105,116 shares; 2017, 247,620 shares |  | 0 |  |  |  |
Options exercised and conversion of common stock units and restricted stock units |  |  | (750) |  |  |
Share-based compensation expense |  |  | 2,253 |  |  |
Net income | $ 15,318 |  |  | 15,318 |  |
Dividends, 2018, $0.285 per share; 2017, $0.275 per share |  |  |  | (11,518) |  |
Change in net unrealized investment gains (losses) on securities | 22,533 |  |  |  | 22,533 |
Change in net funded status of benefit plans | 0 |  |  |  | 0 |
Cumulative effect of change in accounting principle | 0 |  |  | 0 | 0 |
Acquisition of shares, 2018, 161 shares; 2017, 0 shares |  |  |  |  |  | 0
Ending balance at Mar. 31, 2017 | 1,321,818 | 65 | 454,982 | 1,159,532 | 186,454 | (479,215)
Beginning 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, 56,614 shares; 2017, 33,764 shares |  | 0 |  |  |  |
Conversion of common stock units, 2018, 11,804 shares; 2017, 15,981 shares |  | 0 |  |  |  |
Conversion of restricted stock units, 2018, 105,116 shares; 2017, 247,620 shares |  | 1 |  |  |  |
Options exercised and conversion of common stock units and restricted stock units |  |  | (125) |  |  |
Share-based compensation expense |  |  | 2,156 |  |  |
Net income | 20,155 |  |  | 20,155 |  |
Dividends, 2018, $0.285 per share; 2017, $0.275 per share |  |  |  | (11,979) |  |
Change in net unrealized investment gains (losses) on securities | (107,096) |  |  |  | (107,096) |
Change in net funded status of benefit plans | 0 |  |  |  | 0 |
Cumulative effect of change in accounting principle | (15,041) |  |  | 15,041 | (15,041) |
Acquisition of shares, 2018, 161 shares; 2017, 0 shares |  |  |  |  |  | (6)
Ending balance at Mar. 31, 2018 | $ 1,404,679 | $ 66 | $ 466,277 | $ 1,254,394 | $ 164,823 | $ (480,881)

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