Quarterly report pursuant to Section 13 or 15(d)

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

v3.8.0.1
Segment Information (Consolidated Net Sales And Long Lived Assets) (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Apr. 01, 2017
Dec. 30, 2017
Revenues from External Customers and Long-Lived Assets [Line Items]      
Net sales $ 291,998 $ 255,323  
China [Member]      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Net sales 140,592 115,457  
Long-lived assets 99,365   $ 96,248
United States [Member]      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Net sales   $ 30,166  
Long-lived assets $ 56,520   $ 59,589