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Property and Equipment - Summary of property and equipment (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	$ 415,387	$ 379,475
Less: Accumulated depreciation and amortization	(253,495)	(231,391)
Property, Plant and Equipment, Net	161,892	148,084
Land [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	$ 8,475	7,733
Estimated Useful Life in Years	0 years
Buildings and improvements [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	$ 23,228	22,718
Buildings and improvements [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Estimated Useful Life in Years	39 years
Buildings and improvements [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Estimated Useful Life in Years	3 years
Construction equipment [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	$ 371,941	340,060
Construction equipment [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Estimated Useful Life in Years	12 years
Construction equipment [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Estimated Useful Life in Years	3 years
Office equipment [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	$ 11,743	$ 8,964
Office equipment [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Estimated Useful Life in Years	10 years
Office equipment [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Estimated Useful Life in Years	3 years

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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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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+ References

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Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

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