Condensed Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 28, 2015	Jun. 29, 2014	Jun. 28, 2015	Jun. 29, 2014
Net income (loss)	$ 6,534	$ 5,039	$ 10,868	$ 9,861
Other comprehensive income (loss), net of tax:
Foreign currency translation gain (loss)	(2,311)	529	(6,036)	418
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax	(928)	0	(3,020)	0
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Reclassification Adjustment from AOCI, Realized upon Sale or Liquidation, Net of Tax	1,216	0	2,210	0
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax	288	0	(810)	0
Defined benefit pension plan:
Amortization of amounts resulting from changes in actuarial assumptions	134	30	268	59
Tax provision	(50)	(11)	(100)	(22)
Pension changes, net of tax	84	19	168	37
Other comprehensive income (loss), net of tax	(1,939)	548	(6,678)	455
Comprehensive income	$ 4,595	$ 5,587	$ 4,190	$ 10,316