Business Segment Information (Intercompany Segment Gross Profit (Losses)) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Gross profit (loss) with other operating segments of same entity	$ (39)	$ 528	$ 2,883	$ 457
Contracting Services [Member]
Gross profit (loss) with other operating segments of same entity	5	606	3,014	645
Production Facilities [Member]
Gross profit (loss) with other operating segments of same entity	$ (44)	$ (78)	$ (131)	$ (188)