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Property, Plant and Equipment
 12 Months Ended
Dec. 31, 2015
Property, Plant and Equipment [Abstract]  
Property, Plant and Equipment
PROPERTY, PLANT AND EQUIPMENT
(Dollars in thousands)
2015
 
2014
Land and land improvements
$
18,194

 
$
18,374

Buildings and structures
36,364

 
36,174

Machinery and equipment
193,968

 
176,085

Construction in progress
224

 
5,878

 
248,750

 
236,511

Less: accumulated depreciation
(173,465
)
 
(170,762
)
Total property, plant and equipment, net
$
75,285

 
$
65,749


Depreciation charged against operating income totaled $8.2 million, $8.1 million and $8.2 million in 2015, 2014 and 2013, respectively.
Interest expense capitalized was $0.2 million and $0.1 million in 2015 and 2014, respectively. No interest expense was capitalized in 2013.