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Property, Plant and Equipment (Tables)
12 Months Ended
Dec. 31, 2013
Property, Plant and Equipment [Abstract]  
Property, plant and equipment
Property, plant and equipment consist of the following (in thousands): 
 
December 31, 2013
 
December 31, 2012
Land
$
1,764

 
$
2,010

Buildings and improvements
489,535

 
581,286

Machinery and equipment
365,783

 
360,199

Capitalized leases for machinery, equipment, buildings, and land
16,133

 
35,129

 
873,215

 
978,624

Accumulated amortization
(395,520
)
 
(313,067
)
 
477,695

 
665,557

Construction in progress
8,578

 
18,303

 
$
486,273

 
$
683,860