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Property and Equipment
3 Months Ended
Mar. 31, 2020
Property, Plant and Equipment [Abstract]  
Property and Equipment
7.
PROPERTY AND EQUIPMENT
Property and equipment are summarized as follows:
 
 
March 31,
2020
 
December 31,
2019
Construction and transportation equipment
 
$
221,336

 
$
217,945

Buildings and improvements
 
15,711

 
14,641

Land
 
3,891

 
3,891

Office equipment
 
2,607

 
2,767

Total property and equipment
 
243,545

 
239,244

Less accumulated depreciation
 
(125,727
)
 
(123,214
)
Total property and equipment, net
 
$
117,818

 
$
116,030


Depreciation Expense—Depreciation expense is primarily included within cost of revenues and was $5,448 and $3,702 for the three months ended March 31, 2020 and 2019, respectively.