Income Taxes (Details 5)	12 Months Ended
	Dec. 31, 2018
United States Federal | Minimum
Income Tax Examination [Line Items]
Tax years open to examination by major taxing jurisdictions	2015
United States Federal | Maximum
Income Tax Examination [Line Items]
Tax years open to examination by major taxing jurisdictions	2017
State of California | Minimum
Income Tax Examination [Line Items]
Tax years open to examination by major taxing jurisdictions	2014
State of California | Maximum
Income Tax Examination [Line Items]
Tax years open to examination by major taxing jurisdictions	2017
MASSACHUSETTS | Minimum
Income Tax Examination [Line Items]
Tax years open to examination by major taxing jurisdictions	2014
MASSACHUSETTS | Maximum
Income Tax Examination [Line Items]
Tax years open to examination by major taxing jurisdictions	2017
OREGON | Minimum
Income Tax Examination [Line Items]
Tax years open to examination by major taxing jurisdictions	2015
OREGON | Maximum
Income Tax Examination [Line Items]
Tax years open to examination by major taxing jurisdictions	2017
SWEDEN | Minimum
Income Tax Examination [Line Items]
Tax years open to examination by major taxing jurisdictions	2012
SWEDEN | Maximum
Income Tax Examination [Line Items]
Tax years open to examination by major taxing jurisdictions	2017
UNITED KINGDOM | Minimum
Income Tax Examination [Line Items]
Tax years open to examination by major taxing jurisdictions	2014
UNITED KINGDOM | Maximum
Income Tax Examination [Line Items]
Tax years open to examination by major taxing jurisdictions	2017
BELGIUM | Minimum
Income Tax Examination [Line Items]
Tax years open to examination by major taxing jurisdictions	2011
BELGIUM | Maximum
Income Tax Examination [Line Items]
Tax years open to examination by major taxing jurisdictions	2017