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Property and Equipment
 9 Months Ended
Sep. 30, 2020
Property, Plant and Equipment [Abstract]  
Property and Equipment
7.PROPERTY AND EQUIPMENT
Property and equipment are summarized as follows:
September 30,
2020		December 31,
2019
Construction and transportation equipment$225,887 $217,945 
Buildings and improvements19,275 14,641 
Land3,891 3,891 
Office equipment2,762 2,767 
Total property and equipment251,815 239,244 
Less accumulated depreciation(130,281)(123,214)
Total property and equipment, net$121,534 $116,030 
Depreciation Expense—Depreciation expense is primarily included within cost of revenues and was $5,232 and $16,070 for the three and nine months ended September 30, 2020, respectively, and $3,215 and $10,488 for the three and nine months ended September 30, 2019, respectively.