Quarterly report pursuant to Section 13 or 15(d)

Segment Information (Consolidated Net Sales And Long Lived Assets) (Details)

v3.10.0.1
Segment Information (Consolidated Net Sales And Long Lived Assets) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 29, 2018
Sep. 30, 2017
Sep. 29, 2018
Sep. 30, 2017
Dec. 30, 2017
Revenues from External Customers and Long-Lived Assets [Line Items]          
Net sales $ 296,767 $ 261,765 $ 890,225 $ 774,151  
China [Member]          
Revenues from External Customers and Long-Lived Assets [Line Items]          
Net sales 144,625 116,174 436,327 352,462  
Long-lived assets 89,236   89,236   $ 96,248
United States [Member]          
Revenues from External Customers and Long-Lived Assets [Line Items]          
Net sales 29,790 $ 34,183 88,734 $ 93,219  
Long-lived assets $ 51,218   $ 51,218   $ 59,589