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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, 107,148 shares; 2017, 127,774 shares |  | 0 |  |  |  |
Conversion of common stock units, 2018, 30,368 shares; 2017, 15,981 shares |  | 0 |  |  |  |
Conversion of restricted stock units, 2018, 163,835 shares; 2017, 280,341 shares |  | 0 |  |  |  |
Options exercised and conversion of common stock units and restricted stock units |  |  | 1,909 |  |  |
Share-based compensation expense |  |  | 3,929 |  |  |
Net income | $ 17,579 |  |  | 17,579 |  |
Dividends, 2018, $0.57 per share; 2017, $0.55 per share |  |  |  | (23,041) |  |
Change in net unrealized investment gains on securities | 67,772 |  |  |  | 67,772 |
Change in net funded status of benefit plans | 0 |  |  |  | 0 |
Cumulative effect of change in accounting principle | 0 |  |  | 0 | 0 |
Acquisition of shares, 2018, 2,161 shares; 2017, 0 shares |  |  |  |  |  | 0
Ending balance at Jun. 30, 2017 | 1,362,130 | 65 | 459,317 | 1,150,270 | 231,693 | (479,215)
Beginning balance at Mar. 31, 2017 |  |  |  |  | 186,454 |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Net income | 2,261 |  |  |  |  |
Change in net unrealized investment gains on securities | 45,239 |  |  |  |  |
Change in net funded status of benefit plans | 0 |  |  |  |  |
Cumulative effect of change in accounting principle | 0 |  |  |  |  |
Ending balance at Jun. 30, 2017 | 1,362,130 | 65 | 459,317 | 1,150,270 | 231,693 | (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, 107,148 shares; 2017, 127,774 shares |  | 0 |  |  |  |
Conversion of common stock units, 2018, 30,368 shares; 2017, 15,981 shares |  | 0 |  |  |  |
Conversion of restricted stock units, 2018, 163,835 shares; 2017, 280,341 shares |  | 1 |  |  |  |
Options exercised and conversion of common stock units and restricted stock units |  |  | 2,259 |  |  |
Share-based compensation expense |  |  | 4,147 |  |  |
Net income | 26,072 |  |  | 26,072 |  |
Dividends, 2018, $0.57 per share; 2017, $0.55 per share |  |  |  | (23,985) |  |
Change in net unrealized investment gains on securities | (159,540) |  |  |  | (159,540) |
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, 2,161 shares; 2017, 0 shares |  |  |  |  |  | (86)
Ending balance at Jun. 30, 2018 | 1,350,441 | 66 | 470,652 | 1,248,305 | 112,379 | (480,961)
Beginning balance at Mar. 31, 2018 |  |  |  |  | 164,823 |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Net income | 5,917 |  |  |  |  |
Change in net unrealized investment gains on securities | (52,444) |  |  |  |  |
Change in net funded status of benefit plans | 0 |  |  |  |  |
Cumulative effect of change in accounting principle | 0 |  |  |  |  |
Ending balance at Jun. 30, 2018 | $ 1,350,441 | $ 66 | $ 470,652 | $ 1,248,305 | $ 112,379 | $ (480,961)

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