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Condensed Consolidated Statements of Stockholders' Equity (Parenthetical) (USD $) In Thousands, except Per Share data, unless otherwise specified | 6 Months Ended
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Jun. 30, 2012 | Jun. 30, 2011
Condensed Consolidated Statements of Stockholders' Equity |  |
Translation adjustment, tax benefit (expense) (in dollars) | $ 3 | $ 1
Cash dividends declared on common stock, per share | $ 0.25 | $ 0.25
Common stock issued per share for stock bonus | $ 33.71 | $ 30.91

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