Condensed Consolidated Statements Of Equity (USD $) In Thousands	Total	Common stock	Additional paid-in capital	Retained deficit	Foreign currency translation adjustments	Defined benefit pension adjustments
Balance at Dec. 31, 2013	$ 756,843	$ 1,387	$ 819,632	$ (88,599)	$ 25,280	$ (857)
Balance (in shares) at Dec. 31, 2013		138,734
Shares issued under stock plans, net of shares withheld for employee taxes (shares)		434
Shares issued under stock plans, net of shares withheld for employee taxes	(1,989)	5	(1,994)	0	0	0
Share-based compensation expense	1,877	0	1,877	0	0	0
Tax benefit associated with stock plans	244	0	244	0	0	0
Pension liability adjustments	22	0	0	0	0	22
Foreign currency translation	484	0	0	0	484	0
Net income	14,312	0	0	14,312	0	0
Balance at Mar. 29, 2014	771,793	1,392	819,759	(74,287)	25,764	(835)
Balance (in shares) at Mar. 29, 2014		139,168
Balance at Dec. 31, 2014	748,441	1,398	830,430	(80,712)	(1,668)	(1,007)
Balance (in shares) at Dec. 31, 2014		139,793
Shares issued under stock plans, net of shares withheld for employee taxes (shares)		443
Shares issued under stock plans, net of shares withheld for employee taxes	(1,533)	4	(1,537)	0	0	0
Share-based compensation expense	2,258	0	2,258	0	0	0
Tax benefit associated with stock plans	135	0	135	0	0	0
Pension liability adjustments	17	0	0	0	0	17
Foreign currency translation	(9,675)	0	0	0	(9,675)	0
Net income	14,872	0	0	14,872		0
Balance at Mar. 28, 2015	$ 754,515	$ 1,402	$ 831,286	$ (65,840)	$ (11,343)	$ (990)
Balance (in shares) at Mar. 28, 2015		140,236