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Statements of Comprehensive Income (Parenthetical) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2012 | Jun. 30, 2011 | Jun. 30, 2012 | Dec. 31, 2011 | Jun. 30, 2011
Statements of Comprehensive Income |  |  |  |  |
Translation adjustment, tax benefit (expense) (in dollars) | $ (20) | $ 2 | $ 3 | $ (2) | $ 1

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