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Property and Equipment
3 Months Ended
Mar. 31, 2021
Property, Plant and Equipment [Abstract]  
Property and Equipment
6.PROPERTY AND EQUIPMENT
Property and equipment are summarized as follows:
March 31,
2021
December 31,
2020
Construction and transportation equipment$244,416 $231,799 
Buildings and improvements21,895 21,025 
Land3,891 3,891 
Office equipment3,033 3,012 
Total property and equipment273,235 259,727 
Less accumulated depreciation(137,807)(133,059)
Total property and equipment, net$135,428 $126,668 
Depreciation Expense—Depreciation expense is primarily included within cost of revenues and was $5,439 and $5,448 for the three months ended March 31, 2021 and 2020, respectively.