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Commitments and Contingencies (Details) (USD $)
 3 Months Ended
Mar. 31, 2012
Y
Mar. 31, 2011
Dec. 31, 2011
Contractual obligations      
Remainder of 2012 $ 35,111,000    
2013 36,487,000    
2014 204,475,000    
2015 11,009,000    
2016 8,340,000    
Thereafter 27,378,000    
Total 322,800,000    
Unrecognized tax benefits 16,000,000   16,600,000
Unrecognized tax benefits, reduction of long-term deferred tax assets, before federal tax benefit 7,000,000   7,000,000
Unrecognized tax benefits included in long-term income taxes payable 9,000,000   9,600,000
Terms of noncancellable license agreement, minimum (in years) 1    
Rent expense 800,000 600,000  
Deferred rent 500,000   500,000
Cumulative payments made by the Company on behalf of current and former officers 31,900,000 16,900,000  
Payments made by the Company on behalf of current and former officers 30,000 1,200,000  
Imputed financing obligation
      
Contractual obligations      
Remainder of 2012 4,711,000    
2013 6,827,000    
2014 6,997,000    
2015 7,168,000    
2016 7,348,000    
Thereafter 26,020,000    
Total 59,071,000    
Leases
      
Contractual obligations      
Remainder of 2012 2,800,000    
2013 1,562,000    
2014 1,472,000    
2015 1,345,000    
2016 992,000    
Thereafter 1,358,000    
Total 9,529,000    
Software licenses
      
Contractual obligations      
Remainder of 2012 2,308,000    
2013 359,000    
2014 80,000    
Total 2,747,000    
Acquisition retention bonuses
      
Contractual obligations      
Remainder of 2012 16,667,000    
2013 19,114,000    
2014 19,113,000    
2015 2,496,000    
Total 57,390,000    
Convertible notes.
      
Contractual obligations      
2014 172,500,000    
Total 172,500,000    
Interest payments related to convertible notes
      
Contractual obligations      
Remainder of 2012 8,625,000    
2013 8,625,000    
2014 4,313,000    
Total $ 21,563,000