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Operating Leases (Details) (USD $)
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Payments [Abstract]      
2013 $ 1,607,000    
2014 1,068,000    
2015 851,000    
2016 647,000    
2017 508,000    
Thereafter 2,603,000    
Total 7,284,000    
Receipts [Abstract]      
2013 534,000    
2014 202,000    
2015 160,000    
2016 106,000    
2017 3,000    
Thereafter 0    
Total 1,005,000    
Rental expense net of rental income under operating leases $ 800,000 $ 900,000 $ 700,000