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Property, Plant and Equipment, Net
12 Months Ended
Dec. 31, 2021
Property, Plant and Equipment, net  
Property, Plant and Equipment, Net

7. Property, Plant and Equipment, net

December 31, 

(in thousands)

2021

2020

Compression equipment, facilities and other fleet assets

$

3,273,770

$

3,439,432

Land and buildings

 

43,540

 

45,167

Transportation and shop equipment

 

92,490

 

106,868

Computer hardware and software

 

76,908

 

84,680

Other

 

6,229

 

14,457

Property, plant and equipment

 

3,492,937

 

3,690,604

Accumulated depreciation

 

(1,266,411)

 

(1,300,930)

Property, plant and equipment, net

$

2,226,526

$

2,389,674

Depreciation expense was $167.6 million, $177.5 million and $172.8 million during the years ended December 31, 2021, 2020 and 2019, respectively. Assets under construction of $30.1 million and $17.6 million at December 31, 2021 and 2020, respectively, primarily consisted of compression equipment, facilities and other fleet assets.