Receivables (Costs And Estimated Earnings On Uncompleted Contracts) (Details) (USD $) In Thousands	Sep. 30, 2011		Dec. 31, 2010
Receivables [Abstract]
Costs incurred and recognized on uncompleted contracts	$ 82,888		$ 309,725
Estimated earnings (loss)	(5,363)		38,871
Costs and estimated earnings on uncompleted contracts	77,525		348,596
Less: Billings to date	(42,736)		(299,932)
Costs and estimated earnings in excess of billings on uncompleted projects, net	34,789		48,664
Plus: Accrued revenue	9,663	[1]	7,488	[1]
Less: Advance billing on uncompleted contracts	(5,739)		(221)
Net costs and estimated earnings on uncompleted contracts	38,713		55,931
Unbilled work on uncompleted contracts	44,452		56,152
Other accrued liabilities	$ (5,739)		$ (221)

[1] Accrued revenue represents unbilled accounts receivable related to work performed on projects for which the percentage of completion method is not applicable.