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Commitments, Contingencies and Concentrations of Risk (Details) (USD $)
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Lease Commitments      
2014 $ 2,837,000    
2015 2,730,000    
2016 2,398,000    
2017 2,119,000    
2018 1,625,000    
Thereafter 2,344,000    
Total 14,053,000    
Rental expense $ 2,400,000 $ 1,200,000 $ 926,000