Accounts Receivable And Contracts In Progress (Schedule Of Accounts Receivable) (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Accounts Receivable [Line Items]
Retainage	$ 21,220	$ 20,692
Accounts Receivable, Gross	123,439	128,478
Allowance for doubtful accounts	(1,500)	(1,839)
Total accounts receivable	121,939	126,639
Current portion of accounts receivable-net	112,897	120,268
Long-term accounts receivable and retainage	9,042	6,371
Completed Contracts [Member]
Accounts Receivable [Line Items]
Contracts	30,713	38,317
Contracts In Progress [Member]
Accounts Receivable [Line Items]
Contracts	$ 71,506	$ 69,469