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Property, Plant and Equipment, net
 12 Months Ended
Dec. 31, 2018
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,
 
2018
 
2017
Compression equipment, facilities and other fleet assets
$
3,323,465

 
$
3,192,363

Land and buildings
47,067

 
45,754

Transportation and shop equipment
103,766

 
100,133

Computer hardware and software
92,174

 
90,296

Other
11,880

 
12,419

Property, plant and equipment
3,578,352

 
3,440,965

Accumulated depreciation
(1,407,314
)
 
(1,364,038
)
Property, plant and equipment, net
$
2,171,038

 
$
2,076,927



Depreciation expense was $158.4 million, $170.8 million and $191.1 million during the years ended December 31, 2018, 2017 and 2016, respectively. Assets under construction of $55.4 million and $67.9 million at December 31, 2018 and 2017, respectively, were primarily included in compression equipment.