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Property, Plant and Equipment
 12 Months Ended
Dec. 31, 2019
Property Plant And Equipment [Abstract]  
Property, Plant and Equipment

(1) Property, Plant and Equipment

Property, plant and equipment at December 31, 2019 and 2018 consist of the following:

 

 

 

2019

 

 

2018

 

 

Estimated

useful lives

Land

 

$

2,706

 

 

$

2,548

 

 

 

Buildings and improvements

 

 

18,640

 

 

 

17,555

 

 

10 to 30 years

Machinery and equipment

 

 

116,757

 

 

 

109,064

 

 

3 to 15 years

Office furniture, fixtures and equipment

 

 

6,228

 

 

 

5,655

 

 

3 to 10 years

Automotive equipment

 

 

1,762

 

 

 

1,116

 

 

3 to 6 years

Construction in progress

 

 

5,263

 

 

 

2,513

 

 

 

Total gross value

 

 

151,356

 

 

 

138,451

 

 

 

Less accumulated depreciation

 

 

(94,835

)

 

 

(89,199

)

 

 

Total net value

 

$

56,521

 

 

$

49,252

 

 

 

 

For the years ended December 31, 2019, 2018, and 2017, the Company’s aggregate depreciation expense related to property and equipment was $6,504, $8,142, and $8,154, respectively. For the years ended December 31, 2019, 2018, and 2017, the Company eliminated from assets and accumulated depreciation $868, $4,057 and $6,317 of fully depreciated assets, respectively.