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Fair Value Measurements (Details Textual)
12 Months Ended
Dec. 31, 2012
USD ($)
Dec. 31, 2011
USD ($)
Dec. 31, 2010
USD ($)
Dec. 31, 2012
Call Option [Member]
USD ($)
Dec. 31, 2012
Xtrakter Limited [Member]
GBP (£)
Oct. 26, 2012
Xtrakter Limited [Member]
GBP (£)
Business Acquisition [Line Items]            
Purchase price         £ 26,000,000 £ 26,000,000
Call option fair value       32,000    
Fair Value Measurements (Textual) [Abstract]            
Hedge derivative expiration period one-month period          
Proceeds from the maturities of securities available-for-sale 42,000,000 27,400,000 65,400,000      
Mark-to-market loss $ 300,000