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Commitments and Contingencies (Details) (USD $)
 12 Months Ended 0 Months Ended 1 Months Ended 3 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Apr. 03, 2012
Settled litigation
Sep. 30, 2010
Settled litigation
Mar. 31, 2012
Settled litigation
Commitments and Contingencies            
Rent expense $ 822,000 $ 895,000 $ 915,000      
Future minimum lease payments, Operating leases            
2014 756,000          
2015 713,000          
2016 735,000          
2017 756,000          
2018 734,000          
Thereafter 1,270,000          
Total minimum payments 4,964,000          
Future minimum lease payments, Purchase commitments            
2014 2,875,000          
2015 2,565,000          
2016 368,000          
Total minimum payments 5,808,000          
Future minimum lease payments, Total            
2014 3,631,000          
2015 3,278,000          
2016 1,103,000          
2017 756,000          
2018 734,000          
Thereafter 1,270,000          
Total minimum payments 10,772,000          
Commitments and Contingencies            
Contractual payment sought (in shares)         200,000  
Cash award       1,400,000    
Value of shares retired, which were sought as damages           800,000
Amount recorded as expense           $ 600,000