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Income Taxes (Narrative) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Income Taxes [Line Items]          
Increase in valuation allowance   $ 249,200 $ 317,400    
Benefit of federal net operating loss deferred tax assets   6,000      
Benefit of state net operating loss deferred tax assets   600      
Total unrecognized tax benefit   $ 18,786 16,785 $ 18,735 $ 16,952
Period of increase or decrease in total amount of unrecognized income tax benefits   12 months      
Accrued interest or penalties   $ 0 $ 0    
Statutory tax rate   35.00% 35.00% 35.00%  
Pprovisional adjustments to tax provision   $ 113,000      
Scenario, Plan [Member]          
Income Taxes [Line Items]          
Statutory tax rate 21.00%        
Accumulated foreign subsidiary earnings tax rate 15.50%        
Remaining earnings tax rate 8.00%        
Federal [Member]          
Income Taxes [Line Items]          
Net operating loss carryforwards   $ 757,000      
Net operating loss carryforward, expiration   2024      
Research and development credit carryforward   $ 30,800      
Research and developmen tax credit carryforward, expiration   2024      
State [Member]          
Income Taxes [Line Items]          
Net operating loss carryforwards   $ 532,200      
Net operating loss carryforward, expiration   2017      
Research and development credit carryforward   $ 31,800