Business Segment Information (Intercompany Segment Gross Profit (Losses)) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Gross profit (loss) with other operating segments of same entity	$ (98)	$ 19	$ 2,922	$ (71)
Contracting Services [Member]
Gross profit (loss) with other operating segments of same entity	(55)	63	3,009	39
Production Facilities [Member]
Gross profit (loss) with other operating segments of same entity	$ (43)	$ (44)	$ (87)	$ (110)