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Consolidated Statements of Comprehensive Income (Parenthetical) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Consolidated Statements of Comprehensive Income |  |  |
Actuarial net (loss) gain from pension plan, benefit (taxes) | $ 178 | $ (4) | $ 151

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