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Property and Equipment
 3 Months Ended
Mar. 31, 2022
Property, Plant and Equipment [Abstract]  
Property and Equipment
7.PROPERTY AND EQUIPMENT
Property and equipment are summarized as follows:
March 31,
2022		December 31,
2021
Construction and transportation equipment$332,289 $316,381 
Buildings and improvements24,298 24,042 
Land3,891 3,891 
Office equipment3,314 3,270 
Total property and equipment363,792 347,584 
Less accumulated depreciation(151,189)(143,268)
Total property and equipment, net$212,603 $204,316 
Depreciation Expense—Depreciation expense is primarily included within cost of revenues and was $8,199 and $5,439 for the three months ended March 31, 2022 and 2021, respectively.