Income Taxes (Details) (USD $)	3 Months Ended		6 Months Ended
	Jun. 29, 2014	Jun. 30, 2013	Jun. 29, 2014	Jun. 30, 2013	Dec. 29, 2013
Income Taxes [Line Items]
Effective tax rate			23.60%	(17.50%)
Net deferred tax assets	$ 31,300,000		$ 31,300,000		$ 31,500,000
Current income tax receivable	1,800,000		1,800,000		2,800,000
Estimated tax payments	2,000,000		2,000,000
Income tax expense	(1,777,000)	(600,000)	(2,997,000)	(600,000)
Current deferred tax liability	2,600,000		2,600,000
Unrecognized tax benefit, if recognized, would affect the effective tax rate	17,700,000		17,700,000		18,100,000
Interest and penalties benefit			100,000	0
Accrued interest and penalties related to unrecognized tax benefits	4,300,000		4,300,000		4,400,000
Expected change of gross unrecognized tax benefits, minimum	2,700,000		2,700,000
Expected change of gross unrecognized tax benefits, maximum	11,200,000		11,200,000
INDIA
Income Taxes [Line Items]
Income Tax Examination, Year under Examination			2010
Maximum [Member]
Income Taxes [Line Items]
Income Tax Holiday, Termination Date			2017
Maximum [Member] | UNITED STATES
Income Taxes [Line Items]
Open tax years currently under audit			2013
Maximum [Member] | CHINA
Income Taxes [Line Items]
Open tax years currently under audit			2013
Maximum [Member] | Germany [Member]
Income Taxes [Line Items]
Income Tax Examination, Year under Examination			2009
Open tax years currently under audit			2013
Maximum [Member] | Finland [Member]
Income Taxes [Line Items]
Income Tax Examination, Year under Examination			2009
Maximum [Member] | HONG KONG
Income Taxes [Line Items]
Open tax years currently under audit			2013
Minimum [Member]
Income Taxes [Line Items]
Income Tax Holiday, Termination Date			2015
Minimum [Member] | UNITED STATES
Income Taxes [Line Items]
Open tax years currently under audit			2010
Minimum [Member] | CHINA
Income Taxes [Line Items]
Open tax years currently under audit			2011
Minimum [Member] | Germany [Member]
Income Taxes [Line Items]
Income Tax Examination, Year under Examination			2006
Open tax years currently under audit			2006
Minimum [Member] | Finland [Member]
Income Taxes [Line Items]
Income Tax Examination, Year under Examination			2005
Minimum [Member] | HONG KONG
Income Taxes [Line Items]
Open tax years currently under audit			2007
Other Liabilities [Member]
Income Taxes [Line Items]
Accrued interest and penalties related to unrecognized tax benefits	$ 19,700,000		$ 19,700,000		$ 19,600,000