Discontinued Operation (Details) (USD $)	3 Months Ended			12 Months Ended
	Dec. 31, 2011	Sep. 30, 2011	Mar. 31, 2011	Dec. 31, 2011	Dec. 31, 2010
Summarized results of operations for Gateway facility
Impairment charges				$ 15,687,000	$ 809,000
Loss from discontinued operation	(1,000)	(2,000)	(68,000)	(71,000)	(8,885,000)
Gateway facility
Summarized results of operations for Gateway facility
Revenues				2,000	8,116,000
Impairment charges					7,964,000
Loss from discontinued operation before income taxes				(109,000)	(13,668,000)
Income tax benefit of discontinued operation				38,000	4,783,000
Loss from discontinued operation				$ (71,000)	$ (8,885,000)