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Property and Equipment (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Property and equipment
Gross property and equipment	$ 732,720	$ 614,889
Less: accumulated depreciation and amortization	(356,836)	(303,112)
Property and equipment, net	$ 375,884	311,777
Minimum
Property and equipment
Useful Life	3 years
Maximum
Property and equipment
Useful Life	30 years
Land and buildings
Property and equipment
Gross property and equipment	$ 101,170	82,755
Useful Life	30 years
Leasehold improvements
Property and equipment
Gross property and equipment	$ 13,438	12,601
Office equipment
Property and equipment
Gross property and equipment	$ 9,669	8,888
Office equipment | Minimum
Property and equipment
Useful Life	3 years
Office equipment | Maximum
Property and equipment
Useful Life	5 years
Construction equipment
Property and equipment
Gross property and equipment	$ 439,875	392,454
Construction equipment | Minimum
Property and equipment
Useful Life	3 years
Construction equipment | Maximum
Property and equipment
Useful Life	7 years
Transportation equipment
Property and equipment
Gross property and equipment	$ 112,170	101,855
Transportation equipment | Minimum
Property and equipment
Useful Life	3 years
Transportation equipment | Maximum
Property and equipment
Useful Life	18 years
Solar equipment
Property and equipment
Gross property and equipment	$ 21,304
Useful Life	25 years
Construction in progress
Property and equipment
Gross property and equipment	$ 35,094	$ 16,336

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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-Name Accounting Standards Codification
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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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