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Property and Equipment
6 Months Ended
Jun. 30, 2021
Property, Plant and Equipment [Abstract]  
Property and Equipment
6.PROPERTY AND EQUIPMENT
Property and equipment are summarized as follows:
June 30,
2021
December 31,
2020
Construction and transportation equipment$252,797 $231,799 
Buildings and improvements22,493 21,025 
Land3,891 3,891 
Office equipment3,046 3,012 
Total property and equipment282,227 259,727 
Less accumulated depreciation(140,212)(133,059)
Total property and equipment, net$142,015 $126,668 
Depreciation Expense—Depreciation expense is primarily included within cost of revenues and was $5,536 and $10,975 for the three and six months ended June 30, 2021, respectively, and $5,390 and $10,838 for the three and six months ended June 30, 2020, respectively.