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Property, Plant and Equipment
 12 Months Ended
Dec. 28, 2019
Property, Plant and Equipment [Abstract]  
PROPERTY, PLANT AND EQUIPMENT PROPERTY, PLANT AND EQUIPMENT

A summary of property, plant and equipment follows (in thousands):
        
 
December 28, 2019
 
December 29, 2018
Land
$
157,721

 
$
159,981

Buildings and improvements
619,212

 
548,394

Machinery and equipment
2,002,237

 
1,757,314

Vehicles
269,529

 
236,465

Aircraft
9,708

 
18,146

Construction in process
182,392

 
213,653

 
3,240,799

 
2,933,953

Accumulated depreciation
(1,438,388
)
 
(1,246,095
)
 
$
1,802,411

 
$
1,687,858