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Income Taxes (Details 3) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Operating loss carryforwards      
Unrecognized Tax Benefits, Decrease Resulting from Settlements with Taxing Authorities $ (218) $ 0 $ 0
Unrecognized tax benefits, reduction of long-term deferred tax assets, before federal tax benefit 18,600 17,800  
Unrecognized tax benefits included in long-term income taxes payable 2,200 2,100  
Portion of unrecognized tax benefits, which if recognized, would be recorded as an income tax benefit 2,200 2,100  
Amount of potential unrecognized tax benefit 1,000    
Reconciliation of the beginning and ending amounts of unrecognized income tax benefits      
Balance at the beginning of the period 19,903 18,794 16,773
Tax positions related to current year:      
Additions 1,186 1,134 1,156
Tax positions related to prior years:      
Additions 0 531 956
Reductions (35) (556) (91)
Balance at the end of the period 20,836 $ 19,903 $ 18,794
Undistributed earnings 3,900    
Alternative Minimum Tax Credits      
Operating loss carryforwards      
Tax credit carryforwards 2,500    
Foreign Tax Credit      
Operating loss carryforwards      
Tax credit carryforwards 118,600    
Federal      
Operating loss carryforwards      
Tax credit carryforwards subject to expiration 55,000    
Federal | Research and Development as label      
Operating loss carryforwards      
Tax credit carryforwards 34,200    
Federal | Excess Tax Benefits From Stock Option Tax Deductions      
Operating loss carryforwards      
Tax credit carryforwards 37,900    
State and Local Jurisdiction [Member]      
Operating loss carryforwards      
Operating Loss Carryforwards 75,900    
State and Local Jurisdiction [Member] | California Franchise Tax Board [Member]      
Operating loss carryforwards      
Operating Loss Carryforwards 285,000    
State and Local Jurisdiction [Member] | Research and Development as label      
Operating loss carryforwards      
Tax credit carryforwards 22,300    
State and Local Jurisdiction [Member] | Excess Tax Benefits From Stock Option Tax Deductions      
Operating loss carryforwards      
Operating Loss Carryforwards $ 97,700