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Contracts in Process (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Net liability position for contracts in process
Costs and estimated earnings on uncompleted contracts	$ 1,776,835	$ 1,748,204
Less: Billings to date	1,777,950	1,760,637
Net costs and estimated earnings in excess of billings	(1,115)	(12,433)
Net liability position for contracts in process included in consolidated balance sheets
Costs and estimated earnings in excess of billings on uncompleted contracts	47,637	40,519
Billings in excess of costs and estimated earnings on uncompleted contracts	(48,752)	(52,952)
Net costs and estimated earnings in excess of billings	$ (1,115)	$ (12,433)

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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