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Condensed Consolidated Statements of Stockholders' Equity - USD ($) shares in Thousands, $ in Thousands | Total | Common Stock | Additional Paid-in Capital | Retained Earnings | Accumulated Other Comprehensive Income (Loss) | Treasury Stock
--- | --- | --- | --- | --- | --- | ---
Balance at Dec. 31, 2013 | $ 841,279 | $ 486 | $ 207,418 | $ 615,289 | $ 18,086 |
Balance (in shares) at Dec. 31, 2013 |  | 48,712 |  |  |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |
Net income | 32,538 |  |  | 32,538 |  |
Translation adjustment, net of tax | (1,194) |  |  |  | (1,194) |
Stock options exercised | 2,626 | $ 1 | 2,625 |  |  |
Stock options exercised (in shares) |  | 92 |  |  |  |
Stock-based compensation | 5,691 |  | 5,691 |  |  |
Tax effect of options exercised | (186) |  | (186) |  |  |
Shares issued from release of Restricted Stock Units | (2,911) | $ 2 | (2,913) |  |  |
Shares issued from release of Restricted Stock Units (in shares) |  | 158 |  |  |  |
Cash dividends declared on common stock, $0.300, $0.280, and $0.265 for the period ended June 30, 2015, December 31, 2014 and June 30, 2014, respectively | (12,969) |  |  | (12,969) |  |
Common stock issued at $34.32, $0, $35.87 per share for stock bonus for the period ended June 30, 2015, December 31, 2014 and June 30, 2014 | 402 |  | 402 |  |  |
Common stock issued (in shares) |  | 11 |  |  |  |
Balance at Jun. 30, 2014 | 865,276 | $ 489 | 213,037 | 634,858 | 16,892 | $ 0
Balance (in shares) at Jun. 30, 2014 |  | 48,973 |  |  |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |
Net income | 30,993 |  |  | 30,993 |  |
Translation adjustment, net of tax | (23,702) |  |  |  | (23,702) |
Pension adjustment, net of tax | (370) |  |  |  | (370) |
Stock options exercised | 1,956 | $ 1 | 1,955 |  |  |
Stock options exercised (in shares) |  | 69 |  |  |  |
Stock-based compensation | 6,663 |  | 6,663 |  |  |
Tax effect of options exercised | (82) |  | (82) |  |  |
Shares issued from release of Restricted Stock Units | (591) | $ 0 | (591) |  |  |
Shares issued from release of Restricted Stock Units (in shares) |  | 19 |  |  |  |
Repurchase of common stock | (2,981) |  |  |  |  | (2,981)
Repurchase of common stock (in shares) |  | (95) |  |  |  |
Retirement of common stock | 0 | $ (1) |  | (2,980) |  | (2,981)
Cash dividends declared on common stock, $0.300, $0.280, and $0.265 for the period ended June 30, 2015, December 31, 2014 and June 30, 2014, respectively | (13,697) |  |  | (13,697) |  |
Balance at Dec. 31, 2014 | 863,465 | $ 489 | 220,982 | 649,174 | (7,180) |
Balance (in shares) at Dec. 31, 2014 |  | 48,966 |  |  |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |
Net income | 31,560 |  |  | 31,560 |  |
Translation adjustment, net of tax | (8,702) |  |  |  | (8,702) |
Stock options exercised | 5,576 | $ 2 | 5,574 |  |  |
Stock options exercised (in shares) |  | 190 |  |  |  |
Stock-based compensation | 5,995 |  | 5,995 |  |  |
Tax effect of options exercised | (186) |  | (186) |  |  |
Shares issued from release of Restricted Stock Units | (3,636) | $ 2 | (3,638) |  |  |
Shares issued from release of Restricted Stock Units (in shares) |  | 204 |  |  |  |
Repurchase of common stock | (8,464) |  |  |  |  | (8,464)
Repurchase of common stock (in shares) |  | (255) |  |  |  |
Cash dividends declared on common stock, $0.300, $0.280, and $0.265 for the period ended June 30, 2015, December 31, 2014 and June 30, 2014, respectively | (14,820) |  |  | (14,820) |  |
Common stock issued at $34.32, $0, $35.87 per share for stock bonus for the period ended June 30, 2015, December 31, 2014 and June 30, 2014 | 552 |  | 552 |  |  |
Common stock issued (in shares) |  | 16 |  |  |  |
Balance at Jun. 30, 2015 | $ 871,340 | $ 493 | $ 229,279 | $ 665,914 | $ (15,882) | $ (8,464)
Balance (in shares) at Jun. 30, 2015 |  | 49,121 |  |  |  |

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