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Income Tax (Narrative) (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Operating Loss Carryforwards [Line Items] |  |  |  |
Deferred Tax Assets, Tax Credit Carryforwards, Foreign | $ 27,800 | $ 152,000 |  |
Valuation Allowance Related To Tax Cuts And Jobs Act Of 2017 | 58,900 |  |  |
Foreign Currency Translation Adjustment On Valuation Allowance | (12,800) | 10,600 |  |
Reclassification With Other Deferred Tax Assets Impact on Valuation Allowance |  | (5,600) |  |
Cash paid for income taxes | 144,100 | 48,700 | $ 68,000 |
Tax Adjustments, Settlements, and Unusual Provisions | (62,173) | (1,033,755) | 0 |
Deferred Tax Assets, Valuation Allowance | 181,110 | 226,884 |  |
Proceeds from Income Tax Refunds | 2,400 | 11,600 | 6,900 |
Deferred Tax Liability Not Recognized, Amount of Unrecognized Deferred Tax Liability | 1,364,100 | 1,442,900 |  |
Tax Credit Carryforward, Valuation Allowance | 65,100 |  |  |
Subsidiary Net Operating Loss | 24,500 |  |  |
Operating Loss Carryforwards | 1,733 |  |  |
Unrecognized Tax Benefits | 324,625 | 321,224 | 297,290 | $ 296,213
Unrecognized Tax Benefits that Would Impact Effective Tax Rate | 12,800 |  |  |
Unrecognized Tax Benefits, Interest on Income Taxes Expense | 3,300 | 5,000 | $ 8,400 |
Income Tax Examination, Penalties Expense |  | 300 |  |
Unrecognized Tax Benefits, Interest on Income Taxes Accrued | $ 11,600 | 15,100 |  |
Foreign Tax Authority [Member] |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |
Deferred Tax Assets, Operating Loss Carryforwards, Foreign |  | 3,300 |  |
Foreign Tax Authority [Member] | Australian Taxation Office [Member] |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |
Deferred Tax Assets, Operating Loss Carryforwards, Foreign |  | 20,100 |  |
Foreign Tax Authority [Member] | Revenue Commissioners, Ireland [Member] |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |
Deferred Tax Assets, Tax Credit Carryforwards, Foreign |  | $ 65,100 |  |

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