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Property and Equipment
12 Months Ended
Dec. 31, 2019
Property, Plant and Equipment [Abstract]  
Property and Equipment
7.
PROPERTY AND EQUIPMENT
Property and equipment are summarized as follows:
 
As of December 31,
 
2019
 
2018
Construction and transportation equipment
$
217,945

 
$
144,630

Buildings and improvements
14,641

 
11,072

Land
3,891

 
2,720

Office equipment
2,767

 
2,711

Total property and equipment
239,244

 
161,133

Less accumulated depreciation
(123,214
)
 
(109,134
)
Total property and equipment, net
$
116,030

 
$
51,999


Depreciation Expense—Depreciation expense is primarily included within cost of revenues and was approximately $15,900, $14,200 and $15,100 for 2019, 2018 and 2017, respectively.