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Consolidated Statements Of Stockholders' Equity (Unaudited) - 6 months ended Jun. 30, 2015 - USD ($) shares in Thousands, $ in Thousands | Total | Common Stock | Additional Paid-In Capital | Accumulated Other Comprehensive Income, net of taxes | Retained Earnings | Treasury Stock
--- | --- | --- | --- | --- | --- | ---
Balance (in shares) at Dec. 31, 2014 |  |  | 72,878 |  |  |  |
Balance at Dec. 31, 2014 | $ 275,830 |  | $ 729 | $ 186,022 | $ 25 | $ 100,237 | $ (11,183)
Comprehensive income: |  |  |  |  |  |  |
Net income for the period | 31,804 |  |  |  |  | 31,804 |
Unrealized loss on available for sale marketable securities, net of taxes | (17) | [1] |  |  | (17) |  |
Total comprehensive income | 31,787 |  |  |  |  |  |
Exercise of stock options, net of shares tendered for payment (in shares) |  |  | 237 |  |  |  |
Exercise of stock options, net of shares tendered for payment | 4,085 |  | $ 2 | 4,083 |  |  |
Tax benefit from equity compensation plans | 817 |  |  | 817 |  |  |
Share-based compensation expense — stock options and restricted stock | 1,528 |  |  | 1,528 |  |  |
Treasury shares issued for Deferred Compensation Plan funding and redemptions | 492 |  |  | 436 |  |  | 56
Shares issued pursuant to Employee Stock Purchase Plan | 1,701 |  |  | 1,363 |  |  | 338
Cash dividends | (25,415) |  |  |  |  | (25,415) |
Shares issued pursuant to Dividend Reinvestment Plan | 54 |  |  | 169 |  |  | (115)
Shares issued pursuant to prior year acquisition (in shares) |  |  | 176 |  |  |  |
Shares issued pursuant to prior year acquisition | 0 |  | $ 2 | (2) |  |  |
Balance (in shares) at Jun. 30, 2015 |  |  | 73,291 |  |  |  |
Balance at Jun. 30, 2015 | $ 290,879 |  | $ 733 | $ 194,416 | $ 8 | $ 106,626 | $ (10,904)
[1] | All amounts are net of tax.

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