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Income Taxes (Narrative) (Details) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
May 01, 2018
Income Taxes [Line Items]        
Transition tax on foreign earnings payable $ 96,400      
Foreign tax credit related to withholding taxes 106,700      
Change in state tax expense - remeasurement of deferred tax assets 10,000      
Transition tax, noncurrent liability 81,000      
Taxes Payable, Current 4,800      
Transition taxes paid 10,600      
Deferred Tax Liabilities, Financing Arrangements $ 0 $ 430,088   $ 439,200
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 $ 0 $ 186,800 $ 0  
Transition tax on foreign earnings, net of foreign tax credits 162,353      
Foreign Earnings Repatriated 1,150,000      
Effective Income Tax Rate Reconciliation, Tax Holiday, Amount $ 16,900 12,300 21,300  
Deferred Tax Asset for previously unrecognized excess tax benefits 38300000      
Transition tax on foreign earnings $ 5,602 $ (162,353) $ 0  
foreign withholding tax 60,700      
Alternative minimum tax credits 6,900      
Tax Credit Carryforward, Amount $ 18,600      
Impact of tax holiday on diluted earnings per share $ 0.14 $ 0.10 $ 0.16  
Tax credit carryforward expiration 2018 through 2034      
Discount rate       8.42%
Liability for Uncertain Tax Positions, Noncurrent $ 219,500      
Change in state tax expense 5,600      
Federal [Member]        
Income Taxes [Line Items]        
Net operating loss carryforwards 4,500      
State [Member]        
Income Taxes [Line Items]        
Net operating loss carryforwards 700,000      
Federal research tax credits 2,300      
Foreign [Member]        
Income Taxes [Line Items]        
Net operating loss carryforwards $ 18,100      
Tax credit carryforward expiration 2024      
Federal And State [Member]        
Income Taxes [Line Items]        
Operating Loss Carryforwards, Date 2019 through 2034