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Property and Equipment
3 Months Ended
Mar. 31, 2019
Property, Plant and Equipment [Abstract]  
Property and Equipment
6.
PROPERTY AND EQUIPMENT
Property and equipment are summarized as follows:
 
 
March 31,
2019
 
December 31,
2018
Construction and transportation equipment
 
$
148,138

 
$
144,630

Buildings and improvements
 
11,139

 
11,072

Land
 
2,720

 
2,720

Office equipment
 
2,627

 
2,711

Total property and equipment
 
164,624

 
161,133

Less accumulated depreciation
 
(112,613
)
 
(109,134
)
Total property and equipment, net
 
$
52,011

 
$
51,999