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Consolidated Statements Of Changes In Shareholders' Equity (USD $) In Thousands | Common Stock [Member] | Additional Paid-In Capital [Member] | Retained Earnings [Member] | Accumulated Other Comprehensive Income (Loss), Net Of Taxes [Member] | Treasury Stock, At Cost [Member] | Total
--- | --- | --- | --- | --- | --- | ---
Beginning balance at Dec. 31, 2008 | $ 61 | $ 355,542 | $ 694,492 | $ (193,587) | $ (407,663) |
Conversion of common stock units, 2011, 15,715 shares; 2010, 160,876 shares; 2009, 84,562 shares |  |  |  |  |  |
Conversion of restricted stock units, 2011, 182,309 shares; 2010, 47,149 shares; 2009, 38,371 shares |  |  |  |  |  |
Options exercised and conversion of common stock units and restricted stock units |  | 1,366 |  |  |  |
Share-based compensation expense |  | 1,173 |  |  |  |
Net income |  |  | 73,486 |  |  | 73,486
Cash dividends, 2011, $0.46 per share; 2010, $0.35 per share; 2009,$0.2375 per share |  |  | (9,635) |  |  |
Change in net unrealized gains and losses on fixed maturities and equity securities |  |  |  | 204,331 |  | 204,331
Change in net funded status of pension and other postretirement benefit obligations |  |  |  | (21) |  | (21)
Ending balance at Dec. 31, 2009 | 61 | 358,081 | 758,343 | 10,723 | (407,663) | 719,545
Conversion of common stock units, 2011, 15,715 shares; 2010, 160,876 shares; 2009, 84,562 shares |  |  |  |  |  |
Conversion of restricted stock units, 2011, 182,309 shares; 2010, 47,149 shares; 2009, 38,371 shares |  |  |  |  |  |
Options exercised and conversion of common stock units and restricted stock units |  | 7,204 |  |  |  |
Share-based compensation expense |  | 2,163 |  |  |  |
Cumulative effect of adoption of accounting principle, net of taxes |  |  | (1,338) | 1,338 |  |
Net income |  |  | 80,862 |  |  | 80,862
Cash dividends, 2011, $0.46 per share; 2010, $0.35 per share; 2009,$0.2375 per share |  |  | (14,288) |  |  |
Change in net unrealized gains and losses on fixed maturities and equity securities |  |  |  | 86,133 |  | 86,133
Change in net funded status of pension and other postretirement benefit obligations |  |  |  | (1,612) |  | (1,612)
Ending balance at Dec. 31, 2010 | 61 | 367,448 | 823,579 | 96,582 | (407,663) | 880,007
Options exercised, 2011, 136,290 shares; 2010, 263,206 shares; 2009, 0 shares | 1 |  |  |  |  |
Conversion of common stock units, 2011, 15,715 shares; 2010, 160,876 shares; 2009, 84,562 shares |  |  |  |  |  |
Conversion of restricted stock units, 2011, 182,309 shares; 2010, 47,149 shares; 2009, 38,371 shares |  |  |  |  |  |
Options exercised and conversion of common stock units and restricted stock units |  | 4,485 |  |  |  |
Share-based compensation expense |  | 1,451 |  |  |  |
Net income |  |  | 70,480 |  |  | 70,480
Cash dividends, 2011, $0.46 per share; 2010, $0.35 per share; 2009,$0.2375 per share |  |  | (18,990) |  |  |
Change in net unrealized gains and losses on fixed maturities and equity securities |  |  |  | 155,633 |  | 155,633
Change in net funded status of pension and other postretirement benefit obligations |  |  |  | (3,087) |  | (3,087)
Acquisition of 214,834 shares in 2011; 0 shares in 2010 and 2009 |  |  |  |  | (3,054) |
Ending balance at Dec. 31, 2011 | $ 62 | $ 373,384 | $ 875,069 | $ 249,128 | $ (410,717) | $ 1,086,926

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