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Acquisitions (Details Textual) - USD ($) $ in Thousands		1 Months Ended	3 Months Ended
	Apr. 13, 2015	Nov. 24, 2015	Mar. 31, 2016	Dec. 31, 2015
Business Acquisition [Line Items]
Goodwill, Acquired During Period			$ 0
E.S. Boulos Company [Member]
Business Acquisition [Line Items]
Business Combination, Consideration Transferred, Total	$ 11,400
Business Acquisition, Transaction Costs				$ 400
High Country Line Construction Inc [Member]
Business Acquisition [Line Items]
Business Combination, Consideration Transferred, Total		$ 1,700
Business Acquisition, Transaction Costs		200
High Country Line Construction Inc [Member] | Goodwill [Member]
Business Acquisition [Line Items]
Goodwill, Acquired During Period		$ 500

X

- Definition

Amount of direct costs of the business combination including legal, accounting, and other costs incurred to consummate the business acquisition.

+ References

No definition available.

+ Details

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X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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X

- Definition

Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 30
-Paragraph 7
-URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6578-128477

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 50
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 30
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6613-128477

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- Definition

Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267

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- Details

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X

- Details

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X

- Details

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