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Income Taxes (Remaining Tax Years Subject to Examination) (Details)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2007	Dec. 31, 2005	Dec. 31, 2004
United States
Income Tax Examination
Year federal income tax returns have been audited	2015
Income Tax Examination, Year under Examination				2007	2005	2004
Minimum | United States
Income Tax Examination
Income Tax Examination, Year under Examination	2016		2014
Minimum | United Kingdom
Income Tax Examination
Income Tax Examination, Year under Examination	2016
Minimum | Brazil
Income Tax Examination
Income Tax Examination, Year under Examination	2013
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	2018	2015
Maximum | United Kingdom
Income Tax Examination
Income Tax Examination, Year under Examination	2018
Maximum | Brazil
Income Tax Examination
Income Tax Examination, Year under Examination	2018
Maximum | South Korea
Income Tax Examination
Income Tax Examination, Year under Examination	2018
Maximum | China
Income Tax Examination
Income Tax Examination, Year under Examination	2018

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Year federal income tax returns have been audited

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