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Property and Equipment
 12 Months Ended
Dec. 31, 2020
Property, Plant and Equipment [Abstract]  
Property and Equipment
7.PROPERTY AND EQUIPMENT
Property and equipment are summarized as follows:
 As of December 31,
 20202019
Construction and transportation equipment$231,799 $217,945 
Buildings and improvements21,025 14,641 
Land3,891 3,891 
Office equipment3,012 2,767 
Total property and equipment259,727 239,244 
Less accumulated depreciation(133,059)(123,214)
Total property and equipment, net$126,668 $116,030 
Depreciation Expense—Depreciation expense is primarily included within cost of revenues and was approximately $21,300, $16,000 and $14,400 for 2020, 2019 and 2018, respectively.