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Leases (Details) (USD $)
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Future minimum lease payments under all non-cancellable operating leases    
2013 $ 572,000  
2014 456,000  
2015 398,000  
2016 359,000  
2017 281,000  
Thereafter 2,600,000  
Corporate headquarters
   
Non-cancellable operating lease    
Monthly lease payments required through October 31, 2015 16,000  
Monthly lease payments required from November 1, 2015 through expiration in October 2020 17,250  
Rental expense 192,000 196,000
Office space and equipment
   
Non-cancellable operating lease    
Rental expense $ 746,000 $ 681,000