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Intangible Assets (Details Textual) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Amortization of intangible assets $ 147 $ 139
Future Amortization Expense, Year One 535,000  
Future Amortization Expense, Year Two 482,000  
Future Amortization Expense, Year Three 404,000  
Future Amortization Expense, Year Four 404,000  
Future Amortization Expense, after Year Five $ 352,000  
Customer Lists [Member] | Maximum [Member]
    
Finite-Lived Intangible Asset, Useful Life 10 years  
Customer Lists [Member] | Minimum [Member]
    
Finite-Lived Intangible Asset, Useful Life 7 years  
Noncompete Agreements [Member]
    
Finite-Lived Intangible Asset, Useful Life 5 years  
Software [Member]
    
Finite-Lived Intangible Asset, Useful Life 3 years  
Other Intangible Assets [Member]
    
Finite-Lived Intangible Asset, Useful Life 15 years