Restructuring and other impairment charges Reconciliation of changes in accrued liabilities associated with restructuring program (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 28, 2014	Sep. 29, 2013	Sep. 28, 2014	Sep. 29, 2013
Restructuring Reserve [Roll Forward]
Subsequent accruals (reversals)		$ 3,730		$ 21,357
LMA Restructuring Program
Restructuring Reserve [Roll Forward]
Balance, beginning			4,681
Subsequent accruals (reversals)	20	1,768	(3,352)	8,364
Cash payments			(954)
Foreign currency translation			(2)
Balance, ending	373		373
Termination Benefits
Restructuring Reserve [Roll Forward]
Subsequent accruals (reversals)		1,942		8,986
Termination Benefits | LMA Restructuring Program
Restructuring Reserve [Roll Forward]
Balance, beginning			552
Subsequent accruals (reversals)	0	492	(29)	3,318
Cash payments			(533)
Foreign currency translation			10
Balance, ending	0		0
Facility Closure Costs
Restructuring Reserve [Roll Forward]
Subsequent accruals (reversals)		739		1,350
Facility Closure Costs | LMA Restructuring Program
Restructuring Reserve [Roll Forward]
Balance, beginning			427
Subsequent accruals (reversals)	0	162	(112)	536
Cash payments			(317)
Foreign currency translation			2
Balance, ending	0		0
Contract Termination Costs
Restructuring Reserve [Roll Forward]
Subsequent accruals (reversals)		1,032		7,997
Contract Termination Costs | LMA Restructuring Program
Restructuring Reserve [Roll Forward]
Balance, beginning			3,686
Subsequent accruals (reversals)	20	1,097	(3,211)	4,378
Cash payments			(104)
Foreign currency translation			(14)
Balance, ending	357		357
Other Exit Costs
Restructuring Reserve [Roll Forward]
Subsequent accruals (reversals)		17		3,024
Other Exit Costs | LMA Restructuring Program
Restructuring Reserve [Roll Forward]
Balance, beginning			16
Subsequent accruals (reversals)	0	17	0	132
Cash payments			0
Foreign currency translation			0
Balance, ending	$ 16		$ 16