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Income Taxes (Narrative) (Details) - USD ($) $ in Thousands | 1 Months Ended | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Mar. 31, 2017 | Dec. 31, 2017 | Jun. 30, 2015 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2014
Income Tax Examination [Line Items] |  |  |  |  |  |  |
Provision (benefit) for income taxes |  |  |  | $ 48,920 | $ (10,781) | $ (7,552) |
U.S. federal income tax rate |  |  | 35.00% | 35.00% |  |  | 35.00%
Net non-current deferred tax assets |  | $ 30,768 |  | $ 71,707 | 30,768 |  |
Net non-current deferred tax liabilities |  | 41,746 |  | 45,825 | 41,746 |  |
Proceeds from Issuance of Long-term Debt |  |  |  |  |  | 53,000 |
Total foreign tax credit carryforwards |  | 175,229 |  | 111,325 | 175,229 |  |
Deferred Tax Assets, Operating Loss Carryforwards |  |  |  | 59,300 |  |  |
Deferred Tax Assets, Non-Operating Loss Carryforwards |  |  |  | 3,000 |  |  |
Operating Loss Carryforwards, Valuation Allowance |  |  |  | 35,800 |  |  |
Tax Credit Carryforward, Amount |  |  |  | 10,100 |  |  |
Unrecognized tax benefits |  | 2,492 |  | 1,990 | 2,492 | 3,338 |
Expired Foreign Tax Credits | $ 19,500 |  |  |  |  |  |
Increase in Foreign Tax Credit Carryforward |  | 37,700 |  |  |  |  |
Unrecognized Tax Benefits that Would Impact Effective Tax Rate |  |  |  | 2,000 |  |  |
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued |  | 800 |  | 900 | 800 | 800 |
Unrecognized Tax Benefits, Increase (Decrease) Income Tax Penalties and Interest Accrued |  |  |  | 100 | 0 | 0 |
Decrease in Unrecognized Tax Benefits is Reasonably Possible |  |  |  | 2,000 |  |  |
Unrecognized Tax Benefits, Reduction Resulting from Lapse of Applicable Statute of Limitations |  |  |  | 373 |  |  |
Deferred Tax Assets, Net of Valuation Allowance |  | 67,470 |  | 99,961 | 67,470 | $ 6,500 |
Deferred Tax Assets, Capital Loss Carryforwards |  | $ 2,603 |  | 0 | $ 2,603 |  |
Undistributed Earnings of Foreign Subsidiaries |  |  |  | 1,600,000 |  |  |
Undistributed Earnings of Foreign Subsidiaries Subjected to One Time Transition Fee |  |  |  | 998,300 |  |  |
Domestic Tax Authority [Member] |  |  |  |  |  |  |
Income Tax Examination [Line Items] |  |  |  |  |  |  |
Tax Credit Carryforward, Amount |  |  |  | 25,200 |  |  |
State and Local Jurisdiction [Member] |  |  |  |  |  |  |
Income Tax Examination [Line Items] |  |  |  |  |  |  |
Tax Credit Carryforward, Amount |  |  |  | $ 320,300 |  |  |

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