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Income Taxes (Details 5) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Other comprehensive gain (loss) | $ 8 | $ (125) | $ (54)
Actual income tax expense | 15,748 | 7,301 | 6,228
Total income tax expense | $ 15,756 | $ 7,176 | $ 6,174

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