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Property, Plant, and Equipment and Assets Held for Sale
12 Months Ended
Dec. 31, 2019
Property, Plant, and Equipment and Assets Held for Sale  
Property, Plant, and Equipment and Assets Held for Sale

Note 8 — Property, Plant, and Equipment

Property and equipment, net, consist of the following:

December 31,

December 31,

    

2019

    

2018

    

Average Useful Life

(in thousands)

Land

$

5,061

$

5,669

N/A

Building and improvements

 

61,884

 

61,124

1040 years

Machinery and equipment (1)

 

137,692

 

128,385

310 years

Leasehold improvements

 

6,703

 

9,033

37 years

Gross property, plant, and equipment

 

211,340

 

204,211

Less: accumulated depreciation and amortization

 

135,629

 

123,927

Net property, plant, and equipment

$

75,711

$

80,284

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

Depreciation expense was $17.3 million, $17.6 million, and $14.6 million for the years ended December 31, 2019, 2018, and 2017, 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.