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Property, Plant, and Equipment
12 Months Ended
Dec. 31, 2020
Property, Plant, and Equipment  
Property, Plant, and Equipment

Note 6 — Property, Plant, and Equipment

Property, plant, and equipment, net, consist of the following:

December 31,

December 31,

    

2020

    

2019

    

Average Useful Life

(in thousands)

Land

$

5,061

$

5,061

N/A

Building and improvements

 

62,865

 

61,884

1040 years

Machinery and equipment (1)

 

140,493

 

137,692

310 years

Leasehold improvements

 

6,671

 

6,703

37 years

Gross property, plant, and equipment

 

215,090

 

211,340

Less: accumulated depreciation and amortization

 

149,819

 

135,629

Net property, plant, and equipment

$

65,271

$

75,711

(1)Machinery and equipment also includes software, furniture, and fixtures

Depreciation expense was $15.4 million, $17.3 million, and $17.6 million for the years ended December 31, 2020, 2019, and 2018, respectively. During the year ended December 31, 2019, the Company classified vacant land in St. Paul, Minnesota as held for sale, and subsequently sold the land for approximately $0.6 million, which approximated its carrying value.