Accumulated Other Comprehensive Loss - Changes in AOCI (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 29, 2019	Jun. 30, 2018	Jun. 29, 2019	Jun. 30, 2018
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance	$ 540,506	$ 525,076	$ 530,768	$ 272,673
Net current period other comprehensive (loss) income	1,456	(27,213)	(4,457)	(24,718)
Ending Balance	558,254	503,395	558,254	503,395
Unrealized Gains and Losses on Derivative Instruments [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance			(2,309)
Other comprehensive income (loss) before reclassifications			(4,336)
Amounts reclassified from accumulated other comprehensive loss, net of tax			301
Tax effect			911
Net current period other comprehensive (loss) income			(3,124)
Ending Balance	(5,433)		(5,433)
Foreign Currency Items [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance			(43,944)	(6,478)
Other comprehensive income (loss) before reclassifications			(2,033)	(24,718)
Tax effect			700
Net current period other comprehensive (loss) income			(1,333)	(24,718)
Ending Balance	(45,277)	(31,196)	(45,277)	(31,196)
Accumulated other comprehensive income (loss) [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance	(52,166)	(3,983)	(46,253)	(6,478)
Other comprehensive income (loss) before reclassifications			(6,369)	(24,718)
Amounts reclassified from accumulated other comprehensive loss, net of tax			301
Tax effect			1,611
Net current period other comprehensive (loss) income	1,456	(27,213)	(4,457)	(24,718)
Ending Balance	$ (50,710)	$ (31,196)	$ (50,710)	$ (31,196)