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Income Taxes (Details 1) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Provision (benefit) for income taxes      
Current tax expense (benefit) $ 965 $ (2,607) $ 1,780
Deferred tax expense (benefit)   6,442 (3,986)
Income Tax Expense (Benefit) $ 965 $ 3,835 $ (2,206)