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Property, Plant, and Equipment
6 Months Ended
Jun. 30, 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):
 
June 30,
2014
 
December 31,
2013
Land and land improvements
$
141,391

 
$
140,592

Buildings
642,542

 
628,948

Machinery and equipment
4,348,431

 
4,246,294

Construction in progress
195,631

 
168,808

Other
53,324

 
48,058

Property, plant, and equipment, at cost
5,381,319

 
5,232,700

Less accumulated depreciation
(2,564,070
)
 
(2,426,996
)
Property, plant, and equipment, net
$
2,817,249

 
$
2,805,704



Depreciation expense for the three months ended June 30, 2014 and 2013, was $93.0 million and $41.7 million, respectively. During the six months ended June 30, 2014 and 2013, depreciation expense was $169.0 million and $82.8 million, respectively. The increase in depreciation expense relates primarily to the acquisition of Boise in fourth quarter 2013, as well as accelerated depreciation related to shortening the useful lives of our newsprint-related assets at the DeRidder, Louisiana, mill.