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Fabrication Contracts (Details 2) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Fabrication Contracts
Costs and estimated earnings in excess of billings on uncompleted contracts	$ 120,938us-gaap_CostsInExcessOfBillingsOnUncompletedContractsOrPrograms	$ 117,175us-gaap_CostsInExcessOfBillingsOnUncompletedContractsOrPrograms
Billings on uncompleted contracts in excess of costs and estimated earnings	(76,277)us-gaap_BillingsInExcessOfCost	(87,925)us-gaap_BillingsInExcessOfCost
Total cost and estimated earnings versus billings	$ 44,661exh_CostsAndEstimatedEarningsOnUncompletedContractsNet	$ 29,250exh_CostsAndEstimatedEarningsOnUncompletedContractsNet

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- Definition

Represents costs incurred and estimated earnings on uncompleted contracts after billings.

+ References

No definition available.

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- Definition

Liability attributable to (i) billings in excess of costs under the percentage of completion contract accounting method representing the difference between contractually invoiced amounts (billings) and revenue recognized based, for example, on costs incurred to estimated total costs at period end or (ii) contractually invoiced amounts (billings) in excess of costs incurred and accumulated under the completed contract accounting method.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 605

-SubTopic 35

-Section 45

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- Definition

Amount of receivable reflecting the cost incurred on uncompleted contracts in excess of related billings.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 605

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-Publisher SEC

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