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Condensed Consolidated Statements of Stockholders' Equity (Parenthetical) (USD $)
In Thousands, except Per Share data
3 Months Ended9 Months Ended
Dec. 31, 2010
Sep. 30, 2011
Sep. 30, 2010
Condensed Consolidated Statements of Stockholders' Equity   
Translation adjustment, tax expense (benefit) (in dollars)$ 26$ 4$ (14)
Cash dividends declared on common stock, per share$ 0.10$ 0.375$ 0.30
Common stock issued, per share $ 30.91$ 26.42