Income Taxes - Major Jurisdictions No Longer Subject to Audit (Details)	3 Months Ended
	Mar. 31, 2019
U.S. federal
Income Tax Examination [Line Items]
Years No Longer Subject to Audit	2010 and prior
California (United States)
Income Tax Examination [Line Items]
Years No Longer Subject to Audit	2008 and prior
Canada
Income Tax Examination [Line Items]
Years No Longer Subject to Audit	2010 and prior
Japan
Income Tax Examination [Line Items]
Years No Longer Subject to Audit	2012 and prior
South Korea
Income Tax Examination [Line Items]
Years No Longer Subject to Audit	2013 and prior
United Kingdom
Income Tax Examination [Line Items]
Years No Longer Subject to Audit	2014 and prior