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Property, Plant and Equipment (Tables)
3 Months Ended
Mar. 31, 2013
Property, Plant and Equipment [Abstract]  
Property, plant and equipment
Property, plant and equipment consist of the following (in thousands): 
 
March 31, 2013
 
December 31, 2012
Land
$
2,010

 
$
2,010

Buildings and improvements
582,681

 
581,286

Machinery and equipment
370,381

 
360,199

Capitalized leases for machinery, equipment, buildings, and land
28,270

 
35,129

 
983,342

 
978,624

Accumulated depreciation and amortization
(333,470
)
 
(313,067
)
 
649,872

 
665,557

Construction in progress
17,824

 
18,303

 
$
667,696

 
$
683,860