CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jul. 01, 2016	Jul. 03, 2015	Jul. 01, 2016	Jul. 03, 2015
Statement Of Income And Comprehensive Income [Abstract]
Consolidated net income		$ 4,871	$ 19,498	$ 6,777	$ 22,944
Other comprehensive income (loss):
Foreign currency translation adjustments, net of tax	[1]	(2,915)	3,958	(2,850)	(548)
Pension liability adjustments, net of tax	[2]	846	(309)	1,295	420
Total other comprehensive income (loss)		(2,069)	3,649	(1,555)	(128)
Total consolidated comprehensive income (loss)		$ 2,802	$ 23,147	$ 5,222	$ 22,816

[1] The tax effect on this component of comprehensive income was nominal for the three and six months ended July 1, 2016 and $0.5 million for the three and six months ended July 3, 2015.

[2] The tax effect on this component of comprehensive income was not material for all periods presented. See Note 4 for the total amount of pension liability adjustments reclassified out of accumulated other comprehensive income (loss).