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Property, Plant, and Equipment
3 Months Ended
Mar. 31, 2014
Property, Plant and Equipment [Abstract]  
Property, Plant, and Equipment
Property, Plant, and Equipment

Property, plant, and equipment consist of the following (dollars in thousands):
 
March 31,
2014
 
December 31,
2013
Land and land improvements
$
140,886

 
$
140,592

Buildings
637,004

 
628,948

Machinery and equipment
4,268,457

 
4,246,294

Construction in progress
198,082

 
168,808

Other
49,381

 
48,058

Property, plant, and equipment, at cost
5,293,810

 
5,232,700

Less accumulated depreciation
(2,493,068
)
 
(2,426,996
)
Property, plant, and equipment, net
$
2,800,742

 
$
2,805,704



Depreciation expense for the three months ended March 31, 2014 and 2013, was $76.0 million and $41.1 million, respectively.