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Property, Plant, and Equipment (Tables)
12 Months Ended
Dec. 31, 2015
Property, Plant and Equipment [Abstract]  
Summary of Property, Plant and Equipment
Property, plant, and equipment on the Consolidated Balance Sheets is summarized as follows:
 
 
December 31,
(Thousands)
 
2015
 
2014
Land
 
$
7,457

 
$
7,458

Buildings
 
133,427

 
129,673

Machinery and equipment
 
597,423

 
579,906

Software
 
38,505

 
34,525

Construction in progress
 
15,449

 
16,818

Allowances for depreciation
 
(565,203
)
 
(534,908
)
Subtotal
 
227,058

 
233,472

Capital leases
 
10,913

 
10,912

Allowances for depreciation
 
(2,242
)
 
(1,988
)
Subtotal
 
8,671

 
8,924

Mineral resources
 
4,979

 
4,980

Mine development
 
25,681

 
16,399

Allowances for amortization and depletion
 
(2,760
)
 
(16,187
)
Subtotal
 
27,900

 
5,192

Property, plant, and equipment — net
 
$
263,629

 
$
247,588