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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 (loss), net of taxes | Treasury stock, at cost
--- | --- | --- | --- | --- | --- | ---
Beginning balance at Dec. 31, 2011 |  | $ 62 | $ 373,384 | $ 840,644 | $ 251,980 | $ (410,717)
Conversion of common stock units, 2013, 11,851 shares; 2012, 4,266 shares |  |  |  |  |  |
Conversion of restricted stock units, 2013, 119,472 shares; 2012, 48,167 shares |  |  |  |  |  |
Options exercised and conversion of common stock units and restricted stock units |  |  | 2,436 |  |  |
Share-based compensation expense |  |  | 430 |  |  |
Net income | 26,671 |  |  | 26,671 |  |
Cash dividends, 2013, $0.195 per share; 2012, $0.13 per share |  |  |  | (5,372) |  |
Change in net unrealized gains and losses on fixed maturities and equity securities | 12,583 |  |  |  | 12,583 |
Change in net funded status of pension and other postretirement benefit obligations |  |  |  |  |  |
Acquisition of shares, 2013, 89,649 shares; 2012; 200,120 shares |  |  |  |  |  | (3,337)
Ending balance at Mar. 31, 2012 | 1,088,764 | 62 | 376,250 | 861,943 | 264,563 | (414,054)
Beginning balance at Dec. 31, 2012 | 1,245,803 | 62 | 383,135 | 921,969 | 367,089 | (426,452)
Options exercised, 2013, 257,527 shares; 2012, 145,618 shares |  | 1 |  |  |  |
Conversion of common stock units, 2013, 11,851 shares; 2012, 4,266 shares |  |  |  |  |  |
Conversion of restricted stock units, 2013, 119,472 shares; 2012, 48,167 shares |  |  |  |  |  |
Options exercised and conversion of common stock units and restricted stock units |  |  | 6,754 |  |  |
Share-based compensation expense |  |  | 342 |  |  |
Net income | 27,012 |  |  | 27,012 |  |
Cash dividends, 2013, $0.195 per share; 2012, $0.13 per share |  |  |  | (8,052) |  |
Change in net unrealized gains and losses on fixed maturities and equity securities | (8,334) |  |  |  | (8,334) |
Change in net funded status of pension and other postretirement benefit obligations |  |  |  |  |  |
Acquisition of shares, 2013, 89,649 shares; 2012; 200,120 shares |  |  |  |  |  | (1,843)
Ending balance at Mar. 31, 2013 | $ 1,261,683 | $ 63 | $ 390,231 | $ 940,929 | $ 358,755 | $ (428,295)

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