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Income Taxes (Details 2) (USD $)
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Operating loss carryforwards      
Unrecognized tax benefits, reduction of long-term deferred tax assets, before federal tax benefit $ 10,600,000 $ 7,000,000  
Unrecognized tax benefits included in long-term income taxes payable 6,200,000 9,600,000  
Portion of unrecognized tax benefits, which if recognized, would be recorded as an income tax benefit 2,000,000 2,600,000  
Reconciliation of the beginning and ending amounts of unrecognized income tax benefits      
Balance at the beginning of the period 16,610,000 11,816,000 10,353,000
Tax positions related to current year:      
Additions 589,000 608,000 1,401,000
Tax positions related to prior years:      
Additions 1,521,000 4,911,000 140,000
Reductions (1,947,000) (725,000) (78,000)
Balance at the end of the period 16,773,000 16,610,000 11,816,000
Undistributed earnings 6,700,000    
Federal
      
Operating loss carryforwards      
Operating loss carryforwards 79,200,000    
Unrealized excess tax benefits from stock option deductions excluded from tax attributes 93,500,000    
Federal | Research and Development as label
      
Operating loss carryforwards      
Tax credit carryforwards 25,400,000    
State
      
Operating loss carryforwards      
Operating loss carryforwards 296,200,000    
Unrealized excess tax benefits from stock option deductions excluded from tax attributes 99,200,000    
State | Research and Development as label
      
Operating loss carryforwards      
Tax credit carryforwards 11,300,000    
Foreign Tax Authority | Foreign Tax Credit
      
Operating loss carryforwards      
Tax credit carryforwards $ 82,400,000