CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2016	Oct. 02, 2015	Sep. 30, 2016	Oct. 02, 2015
Statement Of Income And Comprehensive Income [Abstract]
Consolidated net income		$ 7,470	$ 6,568	$ 14,247	$ 29,512
Other comprehensive income (loss):
Foreign currency translation adjustments, net of tax	[1]	(563)	(1,624)	(3,413)	(2,172)
Pension liability adjustments, net of tax	[2]	338	517	1,633	937
Total other comprehensive income (loss)		(225)	(1,107)	(1,780)	(1,235)
Total consolidated comprehensive income (loss)		$ 7,245	$ 5,461	$ 12,467	$ 28,277

[1] The tax effect on this component of comprehensive income was nominal for the three and nine months ended September 30, 2016 and $0.2 million for the three and nine months ended October 2, 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).