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Certain Balance Sheet Components Accounts Receivable, Net Additional Information (Details) (USD $)	Dec. 31, 2012	Dec. 31, 2011
Long term Retainage Contract Receivables [Line Items]
Unbilled Contracts Receivable	$ 45,974,000	$ 42,796,000
Long-term unbilled receivables and long-term retainage contract receivables	0	31,500,000
Current retainage contract receivables [Member]
Long term Retainage Contract Receivables [Line Items]
Unbilled Contracts Receivable	11,100,000	7,400,000
Contract Receivable Retainage, Due One Year or Less	$ 20,000,000	$ 2,500,000

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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