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Property, Plant and Equipment
 12 Months Ended
Dec. 31, 2017
Property, Plant and Equipment [Abstract]  
Property, Plant and Equipment
Property, Plant and Equipment
 
 
December 31,
(In thousands)
 
2017
 
2016
Machinery and equipment
 
$
2,124,701

 
$
2,000,512

Buildings and improvements
 
340,042

 
328,251

Land improvements
 
49,908

 
47,844

Office and other equipment
 
46,467

 
40,051

Land
 
11,726

 
7,266

Construction in progress
 
114,424

 
103,429

 
 
$
2,687,268

 
$
2,527,353

Less accumulated depreciation and amortization
 
(1,636,286
)
 
(1,582,025
)
 
 
$
1,050,982

 
$
945,328


The December 31, 2017 and 2016 buildings and improvements and machinery and equipment combined balances include $24.4 million associated with capital leases.
Depreciation expense, including amounts associated with capital leases, totaled $97.0 million, $86.1 million and $79.8 million in 2017, 2016 and 2015, respectively. For 2017, 2016, and 2015, we capitalized $4.6 million, $2.3 million and $0.4 million, respectively, of interest expense associated with the construction of a continuous pulp digester at our Lewiston, Idaho pulp and paperboard mill and the construction of a paper machine at our Shelby, North Carolina consumer products facility.
On November 29, 2016, we announced the permanent closure of our Oklahoma City converting facility, effective March 31, 2017, and the permanent shutdown of two of the five tissue machines at our Neenah, Wisconsin, tissue facility, effective late-December 2016. In association with the March 31, 2017 closure of the Oklahoma City facility, we recorded accelerated depreciation of $3.7 million in the first quarter of 2017 and $1.3 million in the fourth quarter of 2016.