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

 

 

 

 

 

 

 

 

 

 

December 31, 

 

 

    

2016

    

2015

 

Land

    

$
2,485

    

$
2,485

 

Building and improvements

 

 
1,150

 

 
1,150

 

Plants and related equipment

 

 
125,333

 

 
118,457

 

Rental equipment

 

 
34,428

 

 
26,142

 

Office furniture, fixtures, and equipment

 

 
4,924

 

 
4,643

 

Vehicles

 

 
2,317

 

 
1,744

 

Leasehold improvements

 

 
1,292

 

 
942

 

 

 

 
171,929

 

 
155,563

 

Less: accumulated depreciation

 

 
(55,837)

 

 
(43,075)

 

Property, plant and equipment, net

 

$
116,092

 

$
112,488

 

Construction in progress

 

$
9,398

 

$
13,005