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Income Taxes (Remaining Tax Years Subject to Examination) (Details)	12 Months Ended
	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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Year federal income tax returns have been audited

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