Costs and Estimated Earnings on Uncompleted Contracts (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Costs and Estimated Earnings on Uncompleted Contracts
Costs incurred on uncompleted contracts	$ 59,557	$ 51,035
Estimated earnings	19,063	16,644
Contract Receivable, Total	78,620	67,679
Less billings to date	(78,658)	(73,300)
Net bills receivable	(38)	(5,621)
Included in the accompanying condensed consolidated balance sheets under the following captions:
Costs and estimated earnings in excess on uncompleted contracts	12,372	5,747
Billings in excess of costs and estimated earnings on uncompleted contracts	(12,410)	(11,368)
Net bills receivable	$ (38)	$ (5,621)

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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