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Acquisitions (Purchase Price Preliminary Allocation) (Details) (USD $)
In Thousands, unless otherwise specified
Nov. 09, 2012
Dec. 31, 2012
Look.io [Member]
Jun. 13, 2012
Look.io [Member]
Dec. 31, 2012
Engage Pty Ltd. [Member]
Nov. 09, 2012
Engage Pty Ltd. [Member]
Business Acquisition [Line Items]          
Cash $ 386        
Accounts receivable 3,454        
Other current assets 57        
Property and equipment 432        
Other assets 104        
Intangible assets 3,600   767   3,600
Goodwill 6,152 2,405 2,405 6,073  
Total assets acquired 14,185   3,172    
Liabilities assumed (2,632)        
Deferred tax liability (962)   (288)    
Total purchase price consideration $ 10,591   $ 2,884   $ 10,600