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Cost and Estimated Earnings in Excess of Billings (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Sep. 30, 2013
Cost And Estimated Earnings In Excess Of Billings [Line Items]
Contract revenues earned	$ 137,648	$ 109,565
Less contract billings	(134,514)	(97,165)
Costs and estimated earnings in excess of billings	$ 3,134	$ 12,400

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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