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Summary of Significant Accounting Policies (Intangibles) (Details) (USD $)
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Intangible Assets [Line Items]      
Number of businesses acquired with goodwill component 3    
Intangible assets, gross carrying value $ 4,200,000    
Intangibles, net of accumulated amortization 2,157,000 2,282,000  
Estimated future amortization expense:      
2013 125,000    
2014 125,000    
2015 125,000    
2016 125,000    
2017 125,000    
Thereafter 878,000    
Total future amortization 1,503,000    
Trade Names
      
Intangible Assets [Line Items]      
Indefinite-lived intangible asset, gross carrying value 654,000    
Developed Technology, Acquired Customer Contracts, Distribution Agreements and Non-compete Agreements
      
Intangible Assets [Line Items]      
Intangibles, net of accumulated amortization 2,200,000 2,300,000  
Intangible assets, weighted average remaining life 11 years    
Amortization expense $ 125,000 $ 179,000 $ 260,000
Developed Technology, Acquired Customer Contracts, Distribution Agreements and Non-compete Agreements | Minimum
      
Intangible Assets [Line Items]      
Intangible assets, useful lives 5 years    
Developed Technology, Acquired Customer Contracts, Distribution Agreements and Non-compete Agreements | Maximum
      
Intangible Assets [Line Items]      
Intangible assets, useful lives 20 years