Quarterly Results - (unaudited) (Details) (USD $)	3 Months Ended								12 Months Ended
	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Quarterly Results - (unaudited)
Revenues	$ 129,000	$ 22,773,000	$ 23,719,000	$ 126,000	$ 22,443,000	$ 2,916,000	$ 26,381,000	$ 130,000	$ 46,747,000	$ 51,870,000	$ 54,844,000
Operating (loss) earnings	(3,781,000)	8,151,000	8,596,000	(3,781,000)	9,000,000	(20,345,000)	7,407,000	(4,722,000)	9,185,000	(8,660,000)	4,536,000
(Loss) earnings from continuing operations					5,062,000	(14,579,000)	3,901,000	(3,498,000)	4,571,000	(9,114,000)	712,000
Loss from discontinued operation					(1,000)	(2,000)		(68,000)		(71,000)	(8,885,000)
Net (loss) earnings	$ (2,356,000)	$ 4,532,000	$ 5,018,000	$ (2,623,000)	$ 5,061,000	$ (14,581,000)	$ 3,901,000	$ (3,566,000)	$ 4,504,000	$ (9,185,000)	$ (8,173,000)
Continuing operations (in dollars per share)					$ 0.14	$ (0.40)	$ 0.11	$ (0.10)	$ 0.12	$ (0.25)	$ 0.02
Net (loss) earnings per common share - basic (in dollars per share)	$ (0.07)	$ 0.12	$ 0.14	$ (0.07)	$ 0.14	$ (0.40)	$ 0.11	$ (0.10)	$ 0.12	$ (0.25)	$ (0.23)
Continuing operations (in dollars per share)					$ 0.14	$ (0.40)	$ 0.11	$ (0.10)	$ 0.12	$ (0.25)	$ 0.02
Net (loss) earnings per common share - diluted (in dollars per share)	$ (0.07)	$ 0.12	$ 0.14	$ (0.07)	$ 0.14	$ (0.40)	$ 0.11	$ (0.10)	$ 0.12	$ (0.25)	$ (0.23)