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Income Taxes (Narrative) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Income Tax Examination [Line Items]      
Tax benefit from adjustment $ 1,524    
Tax expense from revalue of deferred tax liabilities 1,524    
Difference between effective tax rate and federal statutory rate     33.60%
Deferred income tax assets 41,356 $ 35,004  
Net operating loss carryforwards 288,959 237,186  
Loss carryforwards for U.S. federal income tax purposes 156,685 115,846  
Loss carryforwards for U.S. state income tax purposes 122,497 101,563  
Loss carryforwards for foreign income tax purposes 9,777 19,777  
Unremitted earnings 92,876    
Unrecognized deferred tax liabilities 14,000    
Unrecognized benefits $ 8,272 $ 2,993  
U.S Federal Income Tax      
Income Tax Examination [Line Items]      
Difference in effective rate due to Tax Act 25.60% 48.60%  
Research and experimentation tax credit carryforwards $ 2,934 $ 2,845  
Foreign tax credits 4,026 3,549  
Other tax credits 474 474  
U.S. State Income Tax      
Income Tax Examination [Line Items]      
Research and experimentation tax credit carryforwards 4,049 3,745  
Foreign Income Tax      
Income Tax Examination [Line Items]      
Research and experimentation tax credit carryforwards 915 170  
Other State Income Tax      
Income Tax Examination [Line Items]      
Other tax credits $ 729 $ 600