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Income Taxes (Details 3) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Tax credit and operating loss carryforwards      
Unrecognized tax benefits, reduction of long-term deferred tax assets, before federal tax benefit $ 21,400 $ 20,400  
Unrecognized tax benefits included in long-term income taxes payable 2,100 2,200  
Portion of unrecognized tax benefits, which if recognized, would be recorded as an income tax benefit 2,100 2,200  
Amount of potential unrecognized tax benefit   200  
Reconciliation of the beginning and ending amounts of unrecognized income tax benefits      
Balance at the beginning of the period 22,652 21,925 $ 20,836
Tax positions related to current year:      
Additions 1,032 1,083 1,225
Tax positions related to prior years:      
Additions 115 16 256
Reductions (317) (372) (171)
Unrecognized Tax Benefits, Decrease Resulting from Settlements with Taxing Authorities 0 0 (221)
Balance at the end of the period 23,482 $ 22,652 $ 21,925
Undistributed earnings 12,100    
Deferred Tax Liabilities, Undistributed Foreign Earnings $ 1,300    
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent 21.00% 35.00% 35.00%
Foreign Tax Credit      
Tax credit and operating loss carryforwards      
Tax credit carryforwards $ 215,500    
Federal | Research and Development as label      
Tax credit and operating loss carryforwards      
Tax credit carryforwards 34,300    
Federal | Foreign Tax Credit      
Tax credit and operating loss carryforwards      
Tax Credit Carryforward, Subject To Expiration, Amount 51,300    
State and Local Jurisdiction [Member]      
Tax credit and operating loss carryforwards      
Operating Loss Carryforwards 124,600    
State and Local Jurisdiction [Member] | California Franchise Tax Board [Member]      
Tax credit and operating loss carryforwards      
Operating Loss Carryforwards 244,100    
State and Local Jurisdiction [Member] | Research and Development as label      
Tax credit and operating loss carryforwards      
Tax credit carryforwards $ 28,500