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Fair Value Measurements of Assets and Liabilities (Details 2) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Changes in fair value of the Company's Level 3 contingent consideration obligation      
Fair value adjustment to contingent obligation included in net income $ (5,324) $ (6,235) $ 2,954
Speech Cycle
     
Changes in fair value of the Company's Level 3 contingent consideration obligation      
Fair value adjustment to contingent obligation included in net income 5,300    
Level 3 | Contingent Consideration
     
Changes in fair value of the Company's Level 3 contingent consideration obligation      
Balance as at the beginning of the period 8,379    
Fair value adjustment to contingent obligation included in net income (5,324)    
Fx impact of change in contingent consideration obligation 51    
Balance as at the end of the period 4,490    
Level 3 | Contingent Consideration | Speech Cycle
     
Changes in fair value of the Company's Level 3 contingent consideration obligation      
Earn-out compensation due to employees 511    
Earn-out payment (2,553)    
Level 3 | Contingent Consideration | Miyowa
     
Changes in fair value of the Company's Level 3 contingent consideration obligation      
Earn-out payment (1,041)    
Level 3 | Contingent Consideration | Strumsoft, Inc. (Strumsoft)
     
Changes in fair value of the Company's Level 3 contingent consideration obligation      
Earn-out compensation due to employees 267    
Addition of Earn-out $ 4,200