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Goodwill and Intangible Assets (Details Textual) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Goodwill and intangible assets (Textual) [Abstract]    
Amortization expense of finite life intangible assets $ 159 $ 96
Amortization expense of finite life intangibles for 2013 824  
Amortization expense of finite life intangibles for 2014 816  
Amortization expense of finite life intangibles for 2015 772  
Amortization expense of finite life intangibles for 2016 713  
Amortization expense of finite life intangibles for 2017 $ 713