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Income Taxes (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Summary of income taxes      
To income $ 611 $ (9,503) $ 7,893
To stockholders' equity 10 240 277
Total income taxes $ 621 $ (9,263) $ 8,170