Contracts in Process (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Net asset position for contracts in process
Costs and estimated earnings on uncompleted contracts	$ 1,439,455	$ 1,027,805
Less: Billings to date	1,410,271	1,009,056
Net costs and estimated earnings in excess of billings	29,184	18,749
Net asset position for contracts in process
Costs and estimated earnings in excess of billings on uncompleted contracts	61,773	43,694
Billings in excess of costs and estimated earnings on uncompleted contracts	(32,589)	(24,945)
Net costs and estimated earnings in excess of billings	$ 29,184	$ 18,749

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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Amount included in cost of uncompleted contracts in excess of related billings, or unbilled accounts receivable, which is expected to be collected within a year within one year (or one operating cycle, if longer) from the date of the balance sheet.

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