Business Segment Information (Intercompany Segment Gross Profit (Losses)) (Details) (USD $) In Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Gross profit (loss) with other operating segments of same entity	$ 528	$ 286	$ 457	$ 18,722
Contracting Services [Member]
Gross profit (loss) with other operating segments of same entity	606	330	645	15,473
Production Facilities [Member]
Gross profit (loss) with other operating segments of same entity	$ (78)	$ (44)	$ (188)	$ 3,249