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Income Tax (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Components of provision for income taxes      
Current $ 2,297 $ 1,340 $ 500
Deferred (1,516) 330 194
Income tax expense $ 781 $ 1,670 $ 694