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Costs and Estimated Earnings on Uncompleted Contracts (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
Costs and Estimated Earnings on Uncompleted Contracts
Costs incurred on uncompleted contracts	$ 4,184,551	$ 4,741,249
Gross profit recognized	492,755	582,430
Costs and Estimated Earnings on Uncompleted Contracts	4,677,306	5,323,679
Less: billings to date	(4,747,292)	(5,439,898)
Net cost and estimated earnings in excess of billings	(69,986)	(116,219)
Amount included in consolidated balance sheet
Costs and estimated earnings in excess of billings	88,111	57,146
Billings in excess of costs and estimated earnings	(158,097)	(173,365)
Net cost and estimated earnings in excess of billings	$ (69,986)	$ (116,219)

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Represents the billings to date on all uncompleted contracts.

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Represents the total amount of costs incurred plus estimated earnings on uncompleted contracts.

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Represents the amount of costs incurred on uncompleted contracts.

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Represents the amount of gross profit recognized on uncompleted contracts.

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Represents the net costs and estimated earnings in excess of billings on all uncompleted contracts.

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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 that are expected to be realized within one year or one operating cycle, whichever is longer, from the reporting date.

+ 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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Amount of receivable reflecting the cost incurred on uncompleted contracts in excess of related billings which is expected to be collected within one year or the normal operating cycle, if longer.

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