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Deferred Revenue (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Deferred Revenue Arrangement [Line Items]    
Total deferred revenue $ 185,018 $ 163,437
Less: Deferred revenue, net of current portion (11,119) (9,772)
Deferred revenue, current portion 173,899 153,665
Maintenance [Member]
   
Deferred Revenue Arrangement [Line Items]    
Total deferred revenue 81,741 81,913
Subscriptions [Member]
   
Deferred Revenue Arrangement [Line Items]    
Total deferred revenue 65,850 50,849
Services [Member]
   
Deferred Revenue Arrangement [Line Items]    
Total deferred revenue 36,904 29,675
License fees and other [Member]
   
Deferred Revenue Arrangement [Line Items]    
Total deferred revenue $ 523 $ 1,000