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Inventories
6 Months Ended
Jun. 30, 2018
Notes To Financial Statements [Abstract]  
Inventories
Inventories
Inventories are composed of material, labor and overhead and are stated at the lower of cost or market. Costs for inventory have been determined using the first-in, first-out ("FIFO") method. The company estimates reserves for inventory obsolescence and shrinkage based on its judgment of future realization. Inventories at June 30, 2018 and December 30, 2017 are as follows (in thousands): 
 
Jun 30, 2018
 
Dec 30, 2017
Raw materials and parts
$
215,056

 
$
180,559

Work-in-process
57,092

 
38,917

Finished goods
221,519

 
205,163

 
$
493,667

 
$
424,639