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Property, Plant and Equipment, Net
12 Months Ended
Dec. 31, 2020
Property, Plant and Equipment [Abstract]  
Property, Plant and Equipment, Net

7. Property, Plant and Equipment, net

Property, plant and equipment, net, consisted of the following (in thousands):

December 31, 

2020

2019

Compression equipment, facilities and other fleet assets

$

3,439,432

$

3,653,930

Land and buildings

 

45,167

 

50,743

Transportation and shop equipment

 

106,868

 

116,057

Computer hardware and software

 

84,680

 

93,695

Other

 

14,457

 

15,308

Property, plant and equipment

 

3,690,604

 

3,929,733

Accumulated depreciation

 

(1,300,930)

 

(1,370,335)

Property, plant and equipment, net

$

2,389,674

$

2,559,398

Depreciation expense was $177.5 million, $172.8 million and $158.4 million during the years ended December 31, 2020, 2019 and 2018, respectively. Assets under construction of $17.6 million and $51.0 million at December 31, 2020 and 2019, respectively, were primarily included in compression equipment, facilities and other fleet assets.