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Property, Plant, and Equipment
9 Months Ended
Sep. 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):
 
September 30,
2014
 
December 31,
2013
Land and land improvements
$
138,486

 
$
140,592

Buildings
645,173

 
628,948

Machinery and equipment
4,374,819

 
4,246,294

Construction in progress
253,150

 
168,808

Other
53,177

 
48,058

Property, plant, and equipment, at cost
5,464,805

 
5,232,700

Less accumulated depreciation
(2,646,672
)
 
(2,426,996
)
Property, plant, and equipment, net
$
2,818,133

 
$
2,805,704



Depreciation expense for the three months ended September 30, 2014 and 2013, was $95.1 million and $42.4 million, respectively. During the nine months ended September 30, 2014 and 2013, depreciation expense was $264.1 million and $125.2 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. During the three and nine months ended September 30, 2014, we recognized $18.2 million and $35.4 million, respectively, of incremental depreciation expense related to shortening the useful lives of our newsprint-related assets at the DeRidder, Louisiana, mill.

At September 30, 2014, purchases of property, plant, and equipment included in accounts payable was $49.6 million.