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Acquisitions (Narrative) (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 0 Months Ended 3 Months Ended
Mar. 31, 2014
item
Dec. 31, 2013
Feb. 18, 2014
Digital PlaySpace, Inc. [Member]
Mar. 31, 2014
Digital PlaySpace, Inc. [Member]
Mar. 31, 2014
Subsequent Event [Member]
Medical Modeling Inc. [Member]
Mar. 31, 2014
Subsequent Event [Member]
Robtec [Member]
Apr. 16, 2014
Subsequent Event [Member]
Robtec [Member]
Business Acquisition [Line Items]              
Number of businesses acquired 1            
Date of acquisition       Feb. 18, 2014 Apr. 02, 2014    
Date of acquisition agreement           Apr. 16, 2014  
Fair value of the consideration paid     $ 4,000        
Cash paid for business acquisition     2,000        
Value of shares paid for acquisition     2,000        
Business acquisition, ownership percentage             70.00%
Maximum earnout payment $ 4,500 $ 4,500