Quarterly report pursuant to Section 13 or 15(d)

Intangible Assets - Acquired Finite-Lived Intangible Assets (Details)

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Intangible Assets - Acquired Finite-Lived Intangible Assets (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2013
Jan. 31, 2013
Acquired Finite-Lived Intangible Assets [Line Items]    
Business acqusition, percentage acquired   86.00%
Acquired finite-lived intangible assets $ 119,845  
Existing technology - software
    
Acquired Finite-Lived Intangible Assets [Line Items]    
Acquired finite-lived intangible assets 2,537  
Existing technology - games
    
Acquired Finite-Lived Intangible Assets [Line Items]    
Acquired finite-lived intangible assets 12,150  
Customer relationships
    
Acquired Finite-Lived Intangible Assets [Line Items]    
Acquired finite-lived intangible assets 7,210  
IPR&D
    
Acquired Finite-Lived Intangible Assets [Line Items]    
Acquired finite-lived intangible assets 79,871  
Other
    
Acquired Finite-Lived Intangible Assets [Line Items]    
Acquired finite-lived intangible assets 2,659  
Content library
    
Acquired Finite-Lived Intangible Assets [Line Items]    
Acquired finite-lived intangible assets $ 15,418