XML 24 R13.htm IDEA: XBRL DOCUMENT v3.21.2
Property and Equipment
 9 Months Ended
Sep. 30, 2021
Property, Plant and Equipment [Abstract]  
Property and Equipment
6.PROPERTY AND EQUIPMENT
Property and equipment are summarized as follows:
September 30,
2021		December 31,
2020
Construction and transportation equipment$256,444 $231,799 
Buildings and improvements23,110 21,025 
Land3,891 3,891 
Office equipment3,147 3,012 
Total property and equipment286,592 259,727 
Less accumulated depreciation(138,148)(133,059)
Total property and equipment, net$148,444 $126,668 
Depreciation Expense—Depreciation expense is primarily included within cost of revenues and was $5,763 and $16,738 for the three and nine months ended September 30, 2021, respectively, and $5,232 and $16,070 for the three and nine months ended September 30, 2020, respec