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Acquisitions (Details Textual) - USD ($) $ in Thousands		1 Months Ended		12 Months Ended
	Apr. 13, 2015	Oct. 28, 2016	Nov. 24, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Business Acquisition [Line Items]
Payments to Acquire Businesses, Net of Cash Acquired				$ 12,056	$ 13,087	$ 0
E.S. Boulos Company [Member]
Business Acquisition [Line Items]
Business Combination, Consideration Transferred, Total	$ 11,400
High Country Line Construction Inc [Member]
Business Acquisition [Line Items]
Business Combination, Consideration Transferred, Total			$ 1,700
Business Acquisition, Transaction Costs			200
Finite-lived Intangible Assets Acquired			300
High Country Line Construction Inc [Member] | Goodwill [Member]
Business Acquisition [Line Items]
Goodwill, Acquired During Period			$ 200
Western Pacific Enterprises [Member]
Business Acquisition [Line Items]
Business Acquisition, Transaction Costs				400
Business Combination Compensation Expenses On Contingent Payment				100
Business Combination, Contingent Consideration, Liability				2,200
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability		$ 800
Payments to Acquire Businesses, Net of Cash Acquired		$ 12,100
Western Pacific Enterprises [Member] | Other Income [Member]
Business Acquisition [Line Items]
Business Combination, Contingent Consideration, Liability				$ 1,400

X

- Definition

This element represents the business combination compensation expenses on contingent payment during the period.

+ References

No definition available.

+ Details

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- Definition

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

+ References

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- 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

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- Definition

Amount of increase (decrease) in the value of a contingent consideration liability, including, but not limited to, differences arising upon settlement.

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Amount of liability recognized arising from contingent consideration in a business combination.

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- Definition

Amount of increase in assets, excluding financial assets, lacking physical substance with a definite life, from an acquisition.

+ References

No definition available.

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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
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- Definition

The cash outflow associated with the acquisition of a business, net of the cash acquired from the purchase.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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