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Income Taxes (Details 2) (USD $)
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Operating loss carryforwards      
Unrecognized tax benefits, reduction of long-term deferred tax assets, before federal tax benefit $ 7,000,000 $ 7,200,000  
Unrecognized tax benefits included in long-term income taxes payable 9,600,000 4,600,000  
Portion of unrecognized tax benefits, which if recognized, would be recorded as an income tax benefit 2,600,000 2,800,000  
Reconciliation of the beginning and ending amounts of unrecognized income tax benefits      
Balance at the beginning of the period 11,816,000 10,353,000 9,613,000
Tax positions related to current year:      
Additions 608,000 1,401,000 767,000
Tax positions related to prior years:      
Additions 4,911,000 140,000  
Reductions (725,000) (78,000) (27,000)
Balance at the end of the period 16,610,000 11,816,000 10,353,000
Undistributed earnings 6,100,000    
Federal
      
Operating loss carryforwards      
Unrealized excess tax benefits from stock option deductions excluded from tax attributes 93,500,000    
Federal | Research and Development as label
      
Operating loss carryforwards      
Federal research and development tax credit carryforwards 23,300,000    
State
      
Operating loss carryforwards      
Federal net operating loss carryforwards 245,900,000    
Unrealized excess tax benefits from stock option deductions excluded from tax attributes 99,200,000    
State | Research and Development as label
      
Operating loss carryforwards      
Federal research and development tax credit carryforwards $ 4,800,000