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Income Taxes (Narrative) (Details) - USD ($)
$ / shares in Units, $ in Thousands
 1 Months Ended 12 Months Ended
Aug. 31, 2007
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Income Taxes [Line Items]        
Federal statutory rate   35.00% 35.00% 35.00%
Federal income tax rate after enactment of Tax reform (Percentage)   21.00%    
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Amount   $ 186,800 $ 0 $ 0
U.S tax on foreign earnings, net of foreign tax credits   $ 162,353 0 0
Deferred Tax Asset for previously unrecognized excess tax benefits   38.3    
Deferred Tax Liability Not Recognized, Amount of Unrecognized Deferred Tax Liability, Undistributed Earnings of Foreign Subsidiaries   $ 33,600    
Foreign tax credit related to withholding taxes   26,300    
Foreign Withholding Tax   33,619 $ 0 $ 0
Alternative minimum tax credits   17,000    
Tax Credit Carryforward, Amount   $ 121,500    
Impact of tax holiday on diluted earnings per share   $ 0.10 $ 0.16 $ 0.14
Debt Instrument, Interest Rate, Stated Percentage   3.25%    
Tax credit carryforward expiration   2018 through 2034    
Debt Instruments, Discount Rate 8.50% 8.50%    
Liability for Uncertain Tax Positions, Noncurrent   $ 217,000    
Federal [Member]        
Income Taxes [Line Items]        
Net operating loss carryforwards   5,500    
Federal research tax credits   4,200    
capital loss carryforward   2,900,000    
State [Member]        
Income Taxes [Line Items]        
Net operating loss carryforwards   1,300,000    
Federal research tax credits   2,300    
capital loss carryforward   3,100,000    
Foreign [Member]        
Income Taxes [Line Items]        
Net operating loss carryforwards   $ 18,900    
Tax credit carryforward expiration   2024    
Federal And State [Member]        
Income Taxes [Line Items]        
Operating Loss Carryforwards, Date   2018 through 2034