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CONDENSED CONSOLIDATED STATEMENT OF STOCKHOLDERS' EQUITY (Unaudited) - 6 months ended Jun. 30, 2015 - USD ($) $ in Thousands | Total | Common Stock Shares [Member] | Non-Redeemable Preferred Stock [Member] | Capital in Excess of Par Value [Member] | Retained Earnings [Member] | Treasury Stock-Common [Member]
--- | --- | --- | --- | --- | --- | ---
Balance at Dec. 31, 2014 | $ 434,048 | $ 2,697 | $ 3,000 | $ 170,537 | $ 286,188 | $ (28,374)
Balance, shares at Dec. 31, 2014 |  | 26,968,212 |  |  |  |
Net income | 7,066 |  |  |  | 7,066 |
Dividends paid on preferred stocks | (300) |  |  |  | (300) |
Stock-based compensation | 1,272 |  |  | 1,272 |  |
Exercise of stock options | 1,638 | $ 14 |  | 1,624 |  |
Exercise of stock options, shares |  | 140,000 |  |  |  |
Common stock issued for services | 49 |  |  | 49 |  |
Common stock issued for services, shares |  | 2,000 |  |  |  |
Excess income tax benefit associated with stock-based compensation | 80 |  |  | 80 |  |
Balance at Jun. 30, 2015 | $ 443,853 | $ 2,711 | $ 3,000 | $ 173,562 | $ 292,954 | $ (28,374)
Balance, shares at Jun. 30, 2015 |  | 27,109,544 |  |  |  |

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