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 9 Months Ended
Sep. 30, 2017
Oct. 01, 2016
Sep. 30, 2017
Oct. 01, 2016
Dec. 31, 2016
Revenues from External Customers and Long-Lived Assets [Line Items]          
Net sales $ 261,765 $ 254,219 $ 774,151 $ 753,182  
China [Member]          
Revenues from External Customers and Long-Lived Assets [Line Items]          
Net sales 116,174 108,355 352,462 324,689  
Long-lived assets 94,938   94,938   $ 91,909
United States [Member]          
Revenues from External Customers and Long-Lived Assets [Line Items]          
Net sales 34,183 $ 34,352 93,219 $ 101,245  
Long-lived assets $ 61,384   $ 61,384   $ 63,654