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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, 2015 | $ 849,824 | $ 481 | $ 238,212 | $ 639,707 | $ (28,576) |
Balance (in shares) at Dec. 31, 2015 |  | 48,184 |  |  |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |
Net income | 42,544 |  |  | 42,544 |  |
Translation adjustment, net of tax | 5,011 |  |  |  | 5,011 |
Options exercised | 2,525 | $ 1 | 2,524 |  |  |
Options exercised (in shares) |  | 86 |  |  |  |
Stock-based compensation | 5,951 |  | 5,951 |  |  |
Tax benefit of options exercised | 19 |  | 19 |  |  |
Shares issued from release of Restricted Stock Units | (3,973) | $ 2 | (3,975) |  |  |
Shares issued from release of Restricted Stock Units (in shares) |  | 215 |  |  |  |
Repurchase of common stock | (3,502) |  | 0 |  |  | $ (3,502)
Repurchase of common stock (in shares) |  | (106) |  |  |  |
Cash dividends declared on common stock, $0.34, $0.36 and $0.39 for the period ended June 30, 2016, December 31, 2016 and June 30, 2017, respectively | (16,438) |  |  | (16,438) |  |
Common stock issued at $32.45 per share for stock bonus for the periods ended June 30, 2016 and December 31, 2016 and $44.26 for the period ended June 30, 2017, | 315 |  | 315 |  |  |
Common stock issued (in shares) |  | 10 |  |  |  |
Balance at Jun. 30, 2016 | 882,276 | $ 484 | 243,046 | 665,813 | (23,565) | (3,502)
Balance (in shares) at Jun. 30, 2016 |  | 48,389 |  |  |  |
Balance at Dec. 31, 2015 | 849,824 | $ 481 | 238,212 | 639,707 | (28,576) |
Balance (in shares) at Dec. 31, 2015 |  | 48,184 |  |  |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |
Net income | 47,190 |  |  | 47,190 |  |
Translation adjustment, net of tax | (8,931) |  |  |  | (8,931) |
Pension adjustment, net of tax | (474) |  |  |  | (474) |
Options exercised | 5,451 | $ 2 | 5,449 |  |  |
Options exercised (in shares) |  | 184 |  |  |  |
Stock-based compensation | 7,235 |  | 7,235 |  |  |
Tax benefit of options exercised | 232 |  | 232 |  |  |
Shares issued from release of Restricted Stock Units | (45) | $ 0 | (45) |  |  |
Shares issued from release of Restricted Stock Units (in shares) |  | 2 |  |  |  |
Repurchase of common stock | (50,000) |  | 0 |  |  | (50,000)
Repurchase of common stock (in shares) |  | (1,138) |  |  |  |
Retirement of common stock | 0 | $ (13) |  | (53,489) |  | 53,502
Cash dividends declared on common stock, $0.34, $0.36 and $0.39 for the period ended June 30, 2016, December 31, 2016 and June 30, 2017, respectively | (17,092) |  |  | (17,092) |  |
Balance at Dec. 31, 2016 | 865,842 | $ 473 | 255,917 | 642,422 | (32,970) |
Balance (in shares) at Dec. 31, 2016 |  | 47,437 |  |  |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |
Net income | 51,335 |  |  | 51,335 |  |
Translation adjustment, net of tax | 13,949 |  |  |  | 13,949 |
Options exercised | 1,297 | $ 0 | 1,297 |  |  |
Options exercised (in shares) |  | 44 |  |  |  |
Stock-based compensation | 10,337 |  | 10,337 |  |  |
Tax benefit of options exercised | 0 |  |  |  |  |
Shares issued from release of Restricted Stock Units | (5,155) | $ 2 | (5,157) |  |  |
Shares issued from release of Restricted Stock Units (in shares) |  | 208 |  |  |  |
Repurchase of common stock | (20,000) |  | (2,456) |  |  | (17,544)
Repurchase of common stock (in shares) |  | (425) |  |  |  |
Cash dividends declared on common stock, $0.34, $0.36 and $0.39 for the period ended June 30, 2016, December 31, 2016 and June 30, 2017, respectively | (18,606) |  |  | (18,606) |  |
Common stock issued at $32.45 per share for stock bonus for the periods ended June 30, 2016 and December 31, 2016 and $44.26 for the period ended June 30, 2017, | 412 |  | 412 |  |  |
Common stock issued (in shares) |  | 9 |  |  |  |
Balance at Jun. 30, 2017 | $ 899,411 | $ 475 | $ 260,350 | $ 675,151 | $ (19,021) | $ (17,544)
Balance (in shares) at Jun. 30, 2017 |  | 47,273 |  |  |  |

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