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Income Taxes (Details 2) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Income taxes expenses      
Current $ 26,331 $ 18,211 $ 13,609
Deferred 18,976 6,201 16,428
Total income tax expense $ 45,307 $ 24,412 $ 30,037