Annual report pursuant to Section 13 and 15(d)

Segments - Summarizes the Company's Sales and Long-Lived Assets by Geographic Regions (Details)

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Segments - Summarizes the Company's Sales and Long-Lived Assets by Geographic Regions (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2019
Sep. 28, 2019
Jun. 29, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 29, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Revenues from External Customers and Long-Lived Assets                      
Sales $ 198,412 $ 177,018 $ 189,098 $ 208,174 $ 202,917 $ 212,674 $ 208,606 $ 179,059 $ 772,702 $ 803,256 $ 624,464
Property, Plant and Equipment, Net of Accumulated Depreciation 112,499       120,862       112,499 120,862  
Net Income (34,065) $ 1,210 $ 6,726 $ 78,146 12,485 $ 16,999 $ 14,025 $ 3,294 52,017 46,803 19,679
Cumulative translation adjustments (7,000)       (7,200)       (7,000) (7,200)  
United States                      
Revenues from External Customers and Long-Lived Assets                      
Sales                 583,589 575,830 482,219
Property, Plant and Equipment, Net of Accumulated Depreciation 101,169       110,738       101,169 110,738  
North America (excluding United States)                      
Revenues from External Customers and Long-Lived Assets                      
Sales                 12,585 10,834 6,198
Asia                      
Revenues from External Customers and Long-Lived Assets                      
Sales                 40,764 112,135 58,732
Europe                      
Revenues from External Customers and Long-Lived Assets                      
Sales                 130,227 98,193 73,677
South America                      
Revenues from External Customers and Long-Lived Assets                      
Sales                 862 1,973 1,280
Other                      
Revenues from External Customers and Long-Lived Assets                      
Sales                 4,675 4,291 2,358
France                      
Revenues from External Customers and Long-Lived Assets                      
Property, Plant and Equipment, Net of Accumulated Depreciation 8,740       9,241       8,740 9,241  
India                      
Revenues from External Customers and Long-Lived Assets                      
Property, Plant and Equipment, Net of Accumulated Depreciation 1,509       0       1,509 0  
Canada                      
Revenues from External Customers and Long-Lived Assets                      
Property, Plant and Equipment, Net of Accumulated Depreciation 1,081       883       1,081 883  
Non-US                      
Revenues from External Customers and Long-Lived Assets                      
Sales                 85,900 70,600 53,900
Net Income                 8,600 5,500 $ 2,200
Net assets $ 66,400       $ 45,000       $ 66,400 $ 45,000