Segment Information - Operating Segments (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 29, 2019	Sep. 30, 2018	Sep. 29, 2019	Sep. 30, 2018	Dec. 30, 2018
Segment Reporting Information [Line Items]
Net Sales	$ 348,352	$ 318,325	$ 1,003,547	$ 842,514
Depreciation and amortization	10,880	9,877	33,578	27,067
Total assets	1,424,537		1,424,537		$ 1,284,644
Operating Segments
Segment Reporting Information [Line Items]
Net Sales	348,352	318,325	1,003,547	842,514
Depreciation and amortization	9,528	8,698	29,650	24,511
Total assets	1,520,316		1,520,316
AMERICAS | Operating Segments
Segment Reporting Information [Line Items]
Net Sales	195,900	182,660	563,776	494,265
Depreciation and amortization	3,238	3,373	9,789	10,464
Total assets	704,088		704,088
EUROPE | Operating Segments
Segment Reporting Information [Line Items]
Net Sales	106,115	88,223	294,830	220,645
Depreciation and amortization	4,255	3,181	13,586	7,483
Total assets	619,307		619,307
ASIA- PACIFIC | Operating Segments
Segment Reporting Information [Line Items]
Net Sales	46,337	47,442	144,941	127,604
Depreciation and amortization	2,035	$ 2,144	6,275	$ 6,564
Total assets	$ 196,921		$ 196,921