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Contracts in Process (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Net asset (liability) position for contracts in process
Costs and estimated earnings on uncompleted contracts	$ 1,748,204	$ 1,439,455
Less: Billings to date	1,760,637	1,410,271
Net costs and estimated earnings in excess of billings	(12,433)	29,184
Net asset (liability) position for contracts in process included in consolidated balance sheet
Costs and estimated earnings in excess of billings on uncompleted contracts	40,519	61,773
Billings in excess of costs and estimated earnings on uncompleted contracts	(52,952)	(32,589)
Net costs and estimated earnings in excess of billings	$ (12,433)	$ 29,184

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.

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