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Property, Plant and Equipment (Tables)
6 Months Ended
Jun. 30, 2013
Property, Plant and Equipment [Abstract]  
Property, plant and equipment
Property, plant and equipment consist of the following (in thousands): 
 
June 30, 2013
 
December 31, 2012
Land
$
1,888

 
$
2,010

Buildings and improvements
593,989

 
581,286

Machinery and equipment
379,912

 
360,199

Capitalized leases for machinery, equipment, buildings, and land
22,445

 
35,129

 
998,234

 
978,624

Accumulated depreciation and amortization
(353,533
)
 
(313,067
)
 
644,701

 
665,557

Construction in progress
15,632

 
18,303

 
$
660,333

 
$
683,860