Income Taxes (Tables)

9 Months Ended

Sep. 30, 2018

Income Tax Disclosure [Abstract]

Tax years open to examination by major taxing jurisdictions

The Company currently has the following tax years open to examination by major taxing jurisdictions:

	Tax Years:
United States Federal	2015 - 2016
State of California	2013 - 2016
State of Massachusetts	2013 - 2016
State of Oregon	2014 - 2016
Sweden	2012 - 2016
United Kingdom	2013 - 2016
Belgium	2011 - 2016

Schedule of Components of Income Tax Expense (Benefit) [Table Text Block]

The provision for income taxes was as follows:

	Three Months Ended September 30,						Nine Months Ended September 30,
	2018			2017			2018			2017
Income tax provision	$	12,267		$	21,004		$	39,077		$	46,124
Effective tax rate	14.4		%	24.8		%	17.5		%	22.6		%