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Property, Plant and Equipment
 12 Months Ended
Dec. 31, 2017
Property Plant And Equipment [Abstract]  
Property, Plant and Equipment

NOTE 5.  PROPERTY, PLANT AND EQUIPMENT

 

(Dollars in thousands)

Range of useful lives

 

2017

 

 

2016

 

Land

 

 

$

4,707

 

 

$

4,712

 

Buildings and improvements

10-40 years

 

 

55,734

 

 

 

54,448

 

Machinery and equipment

2-25 years

 

 

197,648

 

 

 

190,316

 

Construction in progress

 

 

 

1,348

 

 

 

1,437

 

 

 

 

 

259,437

 

 

 

250,913

 

Less: accumulated depreciation

 

 

 

(182,208

)

 

 

(178,093

)

Total property, plant and equipment, net

 

 

$

77,229

 

 

$

72,820

 

 

Depreciation charged against operating income totaled $8.1 million, $8.3 million and $8.2 million in 2017, 2016 and 2015, respectively.

Interest expense capitalized was inconsequential in 2017 and 2016, and $0.2 million 2015.