Costs and Estimated Earnings in Excess of Billings on Uncompleted Contracts and Billings in Excess of Costs and Estimated Earnings (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Cost and Estimated Earnings in Excess of Billings on Uncompleted Contracts and Billings in Excess of Costs and Estimated Earnings
Costs incurred on uncompleted contracts	$ 211,801	$ 356,527
Estimated earnings	32,480	56,227
Sum of costs incurred and estimated earnings on uncompleted contracts	244,281	412,754
Less billings to date	(177,445)	(382,539)
Amounts are presented in the Consolidated Balance Sheets as follows:
Costs and estimated earnings in excess of billings on uncompleted contracts	73,314	38,029
Billings in excess of costs and estimated earnings on uncompleted contracts	(6,478)	(7,814)
Total, net	$ 66,836	$ 30,215

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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