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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)
--- | --- | --- | --- | --- | ---
Balance at Dec. 31, 2011 | $ 758,363 | $ 481 | $ 170,483 | $ 580,616 | $ 6,783
Balance (in shares) at Dec. 31, 2011 |  | 48,163 |  |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |
Net income | 7,201 |  |  | 7,201 |
Translation adjustment, net of tax | 7,226 |  |  |  | 7,226
Stock options exercised | 1,758 | 1 | 1,757 |  |
Stock options exercised (in shares) |  | 74 |  |  |
Stock-based compensation | 3,110 |  | 3,110 |  |
Tax effect of options exercised | (2) |  | (2) |  |
Shares issued from release of Restricted Stock Units | (935) |  | (935) |  |
Shares issued from release of Restricted Stock Units (in shares) |  | 61 |  |  |
Cash dividends declared on common stock, $0.50 and $0.125 per share for the period ended December 31, 2012 and March 31, 2012, respectively | (6,038) |  |  | (6,038) |
Common stock issued at $33.83 and $33.71 per share for stock bonus for the period ended March 31, 2013 and March 31, 2012, respectively | 418 |  | 418 |  |
Common stock issued (in shares) |  | 12 |  |  |
Balance at Mar. 31, 2012 | 771,101 | 482 | 174,831 | 581,779 | 14,009
Balance (in shares) at Mar. 31, 2012 |  | 48,310 |  |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |
Net income | 34,717 |  |  | 34,717 |
Translation adjustment, net of tax | (1,667) |  |  |  | (1,667)
Pension adjustment, net of tax | (243) |  |  |  | (243)
Stock options exercised | 3,167 | 1 | 3,166 |  |
Stock options exercised (in shares) |  | 111 |  |  |
Stock-based compensation | 7,085 |  | 7,085 |  |
Tax effect of options exercised | (231) |  | (231) |  |
Shares issued from release of Restricted Stock Units | (174) |  | (174) |  |
Shares issued from release of Restricted Stock Units (in shares) |  | 1 |  |  |
Cash dividends declared on common stock, $0.50 and $0.125 per share for the period ended December 31, 2012 and March 31, 2012, respectively | (24,187) |  |  | (24,187) |
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 | 4,795 |  |  | 4,795 |
Translation adjustment, net of tax | (5,817) |  |  |  | (5,817)
Stock options exercised | 496 | 1 | 495 |  |
Stock options exercised (in shares) |  | 18 |  |  |
Stock-based compensation | 2,813 |  | 2,813 |  |
Tax effect of options exercised | (1,843) |  | (1,843) |  |
Shares issued from release of Restricted Stock Units | (1,906) | 1 | (1,907) |  |
Shares issued from release of Restricted Stock Units (in shares) |  | 108 |  |  |
Common stock issued at $33.83 and $33.71 per share for stock bonus for the period ended March 31, 2013 and March 31, 2012, respectively | 315 |  | 315 |  |
Common stock issued (in shares) |  | 9 |  |  |
Balance at Mar. 31, 2013 | $ 788,421 | $ 485 | $ 184,550 | $ 597,104 | $ 6,282
Balance (in shares) at Mar. 31, 2013 |  | 48,557 |  |  |

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