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Income Taxes (Remaining Tax Years Subject to Examination) (Details) | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2013 | Dec. 31, 2010 | Dec. 31, 2007 | Dec. 31, 2005 | Dec. 31, 2004
United States |  |  |  |  |  |
Income Tax Examination |  |  |  |  |  |
Year federal income tax returns have been audited | 2013 |  |  |  |  |
Income Tax Examination, Year under Examination |  |  |  | 2007 | 2005 | 2004
Minimum | United States |  |  |  |  |  |
Income Tax Examination |  |  |  |  |  |
Income Tax Examination, Year under Examination | 2014 |  | 2010 |  |  |
Minimum | United Kingdom |  |  |  |  |  |
Income Tax Examination |  |  |  |  |  |
Income Tax Examination, Year under Examination | 2012 |  |  |  |  |
Minimum | Brazil |  |  |  |  |  |
Income Tax Examination |  |  |  |  |  |
Income Tax Examination, Year under Examination | 2012 |  |  |  |  |
Minimum | South Korea |  |  |  |  |  |
Income Tax Examination |  |  |  |  |  |
Income Tax Examination, Year under Examination | 2014 |  |  |  |  |
Minimum | China |  |  |  |  |  |
Income Tax Examination |  |  |  |  |  |
Income Tax Examination, Year under Examination | 2008 |  |  |  |  |
Maximum | United States |  |  |  |  |  |
Income Tax Examination |  |  |  |  |  |
Income Tax Examination, Year under Examination | 2017 | 2013 |  |  |  |
Maximum | United Kingdom |  |  |  |  |  |
Income Tax Examination |  |  |  |  |  |
Income Tax Examination, Year under Examination | 2017 |  |  |  |  |
Maximum | Brazil |  |  |  |  |  |
Income Tax Examination |  |  |  |  |  |
Income Tax Examination, Year under Examination | 2017 |  |  |  |  |
Maximum | South Korea |  |  |  |  |  |
Income Tax Examination |  |  |  |  |  |
Income Tax Examination, Year under Examination | 2017 |  |  |  |  |
Maximum | China |  |  |  |  |  |
Income Tax Examination |  |  |  |  |  |
Income Tax Examination, Year under Examination | 2017 |  |  |  |  |

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Tax year being audited in the income tax examination, in CCYY format. + References No definition available. + Details
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