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CONSOLIDATED STATEMENT OF CHANGES IN SHAREHOLDERS' EQUITY (Unaudited) - 9 months ended Sep. 30, 2015 - USD ($) $ in Thousands | Common Stock [Member] | Additional Paid-In Capital [Member] | Retained Earnings [Member] | Accumulated Other Comprehensive Income [Member] | Treasury Stock [Member] | Total
--- | --- | --- | --- | --- | --- | ---
Balance at Dec. 31, 2014 | $ 41,606 | $ 409,984 | $ 525,985 | $ 30,720 | $ (20,391) | $ 987,904
Balance (in shares) at Dec. 31, 2014 | 40,747,721 |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Net income |  |  | 71,159 |  |  | 71,159
Other comprehensive income, net of tax |  |  |  | 15,187 |  | 15,187
Cash dividends declared: |  |  |  |  |  |
Common, $0.91 per share |  |  | (37,123) |  |  | (37,123)
Common stock issued under employee stock plan, including tax benefits of $1,541 | $ 323 | 8,065 |  |  |  | 8,388
Common stock issued under employee stock plan, including tax benefits of $1,541 (in shares) | 322,879 |  |  |  |  |
Stock-based compensation |  | 3,164 |  |  |  | 3,164
Treasury stock purchased |  |  |  |  | (9,125) | $ (9,125)
Treasury stock purchased (in shares) | (265,230) |  |  |  |  | (265,230)
Treasury stock issued to benefit plan |  |  |  |  | 5,472 | $ 5,472
Treasury stock issued to benefit plan (in shares) | 213,653 |  |  |  |  |
Balance at Sep. 30, 2015 | $ 41,929 | $ 421,213 | $ 560,021 | $ 45,907 | $ (24,044) | $ 1,045,026
Balance (in shares) at Sep. 30, 2015 | 41,019,023 |  |  |  |  |

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