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Property and Equipment (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 164,338	$ 161,133
Less accumulated depreciation	(115,121)	(109,134)
Total property and equipment, net	49,217	51,999
Construction and transportation equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	147,796	144,630
Buildings and improvements
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	11,195	11,072
Land
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	2,720	2,720
Office equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 2,627	$ 2,711

X

- Definition

Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

+ References

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- Definition

Amount before accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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