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Property and Equipment - Summary (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 154,600	$ 153,015
Less accumulated depreciation	(102,874)	(98,609)
Total property and equipment, net	51,726	54,406
Construction equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	120,857	118,868
Transportation equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	17,758	17,511
Buildings
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	9,738	9,577
Office equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	2,706	3,339
Leasehold Improvement
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	914	914
Construction in progress
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	279	258
Land
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	2,348	2,348
Water rights
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 0	$ 200

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

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (c)
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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.

+ References

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+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
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