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Acquisitions Purchase price allocation (Details) (USD $)
In Thousands, unless otherwise specified
0 Months Ended
Jun. 30, 2012
Dec. 31, 2011
Apr. 02, 2011
JaBo Software [Member]
Apr. 02, 2011
Customer Relationships (useful life - 7 years) [Member]
JaBo Software [Member]
Apr. 02, 2011
Trade & Domain Names (usefule life - 10 years) [Member]
JaBo Software [Member]
Apr. 02, 2011
Current Technology (useful life - 2 years) [Member]
JaBo Software [Member]
Apr. 02, 2011
Noncompete Agreements (useful life - 2 years) [Member]
JaBo Software [Member]
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net [Abstract]              
Goodwill $ 155,244 $ 155,677 $ 4,138        
Useful life of intangible assets       7 years 10 years 2 years 2 years
Accounts receivable and other assets     983        
Contingent asset     230        
Identifiable intangible assets              
Identifiable intangible assets       3,200 [1] 2,600 [1] 700 [1] 300 [1]
Total assets     12,151        
Liabilities assumed:              
Deferred tax liability     1,700        
Other liabilities     1,291        
Total net assets acquired     $ 9,160        
[1] The weighted average useful life of the identifiable intangible assets acquired is 7 years.