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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 |  |

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