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Property, Plant and Equipment, net
12 Months Ended
Dec. 31, 2015
Property, Plant and Equipment [Abstract]  
Property, Plant and Equipment, net
5. Property, Plant and Equipment, net

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

 
December 31,
 
2015
 
2014
Compression equipment, facilities and other fleet assets
$
3,292,364

 
$
3,401,594

Land and buildings
53,175

 
51,391

Transportation and shop equipment
108,998

 
103,207

Other
109,291

 
84,382

 
3,563,828

 
3,640,574

Accumulated depreciation
(1,296,040
)
 
(1,268,493
)
Property, plant and equipment, net
$
2,267,788

 
$
2,372,081



Depreciation expense was $212.0 million, $200.0 million and $180.7 million during the years ended December 31, 2015, 2014 and 2013, respectively. Assets under construction of $71.1 million and $82.6 million were primarily included in compression equipment, facilities and other fleet assets at December 31, 2015 and 2014, respectively. We capitalized $0.3 million, $0.2 million and $0.3 million of interest related to construction in process during the years ended December 31, 2015, 2014 and 2013, respectively.