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Consolidated Statements Of Stockholders' Equity (USD $) In Thousands, except Share data, unless otherwise specified | Total | Common Stock [Member] | Additional Paid-In Capital [Member] | Accumulated Other Comprehensive Income, net of taxes [Member] | Retained Earnings [Member] | Treasury Stock [Member]
--- | --- | --- | --- | --- | --- | ---
Balance at Dec. 31, 2012 | $ 229,570 |  | $ 700 | $ 113,495 | $ 127 | $ 127,042 | $ (11,794)
Balance, Shares at Dec. 31, 2012 |  |  | 70,036,000 |  |  |  |
Comprehensive income: |  |  |  |  |  |  |
Net income for the period | 27,887 |  |  |  |  | 27,887 |
Unrealized loss on available for sale marketable securities, net of taxes | (83) | [1] |  |  | (83) |  |
Comprehensive income | 27,804 |  |  |  |  |  |
Exercise of stock options and other stock-based compensation, net of shares tendered for payment | 4,680 |  | 4 | 4,636 |  |  | 40
Exercise of stock options and other stock-based compensation, net of shares tendered for payment, Shares |  |  | 371,000 |  |  |  |
Tax benefit from equity compensation plans | 1,128 |  |  | 1,128 |  |  |
Share-based compensation expense — stock options and restricted stock | 1,011 |  |  | 1,011 |  |  |
Treasury shares issued for Deferred Compensation Plan funding and redemptions | 363 |  |  | 352 |  |  | 11
Shares issued pursuant to Employee Stock Plans | 1,842 |  |  | 1,370 |  |  | 472
Cash dividends | (22,931) |  |  |  |  | (22,931) |
Shares issued pursuant to Dividend Reinvestment Plan | 53 |  |  | 156 |  |  | (103)
Balance at Jun. 30, 2013 | $ 243,520 |  | $ 704 | $ 122,148 | $ 44 | $ 131,998 | $ (11,374)
Balance, Shares at Jun. 30, 2013 |  |  | 70,407,000 |  |  |  |
[1] | All amounts are net of tax.

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