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Property, Plant and Equipment
12 Months Ended
Dec. 31, 2011
Property, Plant and Equipment [Abstract]  
PROPERTY, PLANT AND EQUIPMENT
PROPERTY, PLANT AND EQUIPMENT

A summary of property, plant and equipment follows (in thousands):

        
 
December 31,
2011
 
January 1,
2011
Land
$
46,386

 
$
44,864

Buildings and improvements
117,505

 
110,988

Machinery and equipment
372,988

 
336,856

Vehicles
90,651

 
91,015

Aircraft
11,650

 
11,650

Construction in process
39,442

 
36,312

 
678,622

 
631,685

Accumulated depreciation
(278,400
)
 
(238,265
)
 
$
400,222

 
$
393,420