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Intangible Assets (Details 1) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Estimated amortization    
2013 $ 759  
2014 749  
2015 602  
2016 502  
2017 502  
Thereafter 934  
Estimated amortization $ 4,048 $ 2,292