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Property, Plant and Equipment
 3 Months Ended
Mar. 31, 2022
Property, Plant and Equipment [Abstract]  
Property, Plant and Equipment PROPERTY, PLANT AND EQUIPMENT
The Company’s property, plant and equipment at March 31, 2022 and December 31, 2021 consisted of the following (in thousands):
March 31,
2022		December 31,
2021
Liquefaction plants and systems$47,590 $47,235 
Real property and buildings2,558 2,348 
Vehicles and tanker trailers and equipment50,309 50,027 
Computer and office equipment739 691 
Construction in progress2,180 1,495 
Leasehold improvements31 31 
103,407 101,827 
Less: accumulated depreciation(49,515)(47,140)
$53,892 $54,687 
Depreciation expense for the three months ended March 31, 2022 and 2021 totaled $2.3 million and $2.2 million respectively, all of which is included in the Condensed Consolidated Statements of Operations as a separate line item.