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Commitments and Contingencies (Details) (USD $)
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Future minimum lease payments under non-cancelable operating leases      
2014 $ 1,686,000    
2015 1,353,000    
2016 1,341,000    
2017 921,000    
2018 91,000    
Total minimum lease payments 5,392,000    
Rent expense $ 2,000,000 $ 2,400,000 $ 2,300,000