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Condensed Consolidated Statements of Stockholders' Equity (USD $) In Thousands, unless otherwise specified | Total | Common Stock | Additional Paid-in Capital | Retained Earnings | Accumulated Other Comprehensive Income (Loss) | Treasury Stock
--- | --- | --- | --- | --- | --- | ---
Balance at Dec. 31, 2012 | $ 789,568 | $ 483 | $ 184,677 | $ 592,309 | $ 12,099 |
Balance (in shares) at Dec. 31, 2012 |  | 48,422 |  |  |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |
Net income | 23,297 |  |  | 23,297 |  |
Translation adjustment, net of tax | (6,815) |  |  |  | (6,815) |
Stock options exercised | 776 | 1 | 775 |  |  |
Stock options exercised (in shares) |  | 31 |  |  |  |
Stock-based compensation | 5,649 |  | 5,649 |  |  |
Tax effect of options exercised | (1,850) |  | (1,850) |  |  |
Shares issued from release of Restricted Stock Units | (2,019) | 1 | (2,020) |  |  |
Shares issued from release of Restricted Stock Units (in shares) |  | 107 |  |  |  |
Repurchase of common stock | (9,825) |  |  |  |  | (9,825)
Repurchase of common stock (in shares) |  | (342) |  |  |  |
Cash dividends declared on common stock, $0.265, $0.25, and $0.125 per share for the period ended June 30, 2014, December 31, 2013, and June 30, 2013 respectively | (6,068) |  |  | (6,068) |  |
Common stock issued at $35.87, $0, and $33.81 per share for stock bonus for the period ended June 30, 2014, December 31, 2013, and June 30, 2013, respectively | 318 |  | 318 |  |  |
Common stock issued (in shares) |  | 9 |  |  |  |
Balance at Jun. 30, 2013 | 793,031 | 485 | 187,549 | 609,538 | 5,284 | (9,825)
Balance (in shares) at Jun. 30, 2013 |  | 48,227 |  |  |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |
Net income | 27,674 |  |  | 27,674 |  |
Translation adjustment, net of tax | 12,756 |  |  |  | 12,756 |
Pension adjustment, net of tax | 46 |  |  |  | 46 |
Stock options exercised | 14,281 | 4 | 14,277 |  |  |
Stock options exercised (in shares) |  | 481 |  |  |  |
Stock-based compensation | 6,441 |  | 6,441 |  |  |
Tax effect of options exercised | (795) |  | (795) |  |  |
Shares issued from release of Restricted Stock Units | (53) | 1 | (54) |  |  |
Shares issued from release of Restricted Stock Units (in shares) |  | 4 |  |  |  |
Retirement of treasury stock |  | (4) |  | (9,821) |  | 9,825
Cash dividends declared on common stock, $0.265, $0.25, and $0.125 per share for the period ended June 30, 2014, December 31, 2013, and June 30, 2013 respectively | (12,102) |  |  | (12,102) |  |
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, $0.265, $0.25, and $0.125 per share for the period ended June 30, 2014, December 31, 2013, and June 30, 2013 respectively | (12,969) |  |  | (12,969) |  |
Common stock issued at $35.87, $0, and $33.81 per share for stock bonus for the period ended June 30, 2014, December 31, 2013, and June 30, 2013, respectively | 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 |  |  |  |

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- Definition Equity impact of the cost of common and preferred stock that were repurchased during the period. Recorded using the cost method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6405813&loc=d3e23239-112655 + Details
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