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Summary of Significant Accounting Policies - Summary of costs incurred and billings and estimated earnings recognized on uncompleted contracts (Details 1) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Summary Of Significant Accounting Policies [Abstract]
Costs Incurred on Uncompleted Contracts	$ 324,743	$ 307,085
Less Billings to Date	(338,349)	(321,388)
Plus Estimated Earnings Recognized	2,570	1,762
Unbilled Contracts Receivable, Total	$ (11,036)	$ (12,541)

Unbilled amounts due for services rendered or to be rendered, actions taken or to be taken, or a promise to refrain from taking certain actions in accordance with the terms of a legally binding agreement between the entity and, at a minimum, one other party. An example would be amounts associated with contracts or programs where the recognized revenue for performance thereunder exceeds the amounts billed under the terms thereof as of the date of the balance sheet.

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