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Property, Plant and Equipment (Tables)
12 Months Ended
Dec. 29, 2018
Property, Plant and Equipment [Abstract]  
Property, Plant and Equipment
A summary of property, plant and equipment follows (in thousands):
        
 
December 29, 2018
 
December 30, 2017
Land
$
159,981

 
$
165,847

Buildings and improvements
548,394

 
513,078

Machinery and equipment
1,757,314

 
1,617,008

Vehicles
236,465

 
229,995

Aircraft
18,146

 
13,504

Construction in process
213,653

 
181,838

 
2,933,953

 
2,721,270

Accumulated depreciation
(1,246,095
)
 
(1,075,448
)
 
$
1,687,858

 
$
1,645,822