Stock-Based Compensation Plans (Details 2) (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Summary of transactions involving stock options awarded under the Directors Stock Plan
Number of Shares Outstanding, Beginning Balance	3,168,630	3,165,866	2,734,736
Number of Shares, Expired	(1,709,020)	(110,266)	(183,500)
Number of Shares Outstanding, Ending Balance	4,150,410	3,168,630	3,165,866	2,734,736
Stock options Vested and Exercisable	1,111,606
Weighted Average Exercise Price, Beginning Balance	$ 3.03	$ 3.51	$ 6.29
Weighted Average Exercise price, Expired	$ 3.67	$ 13.92	$ 37.99
Weighted Average Exercise Price, Ending Balance	$ 1.07	$ 3.03	$ 3.51	$ 6.29
Stock options Vested and Exercisable, Weighted Average Exercise Price	$ 2.54
Weighted Average Remaining Contractual Term in Years	8 years 4 months 24 days	3 years 4 months 24 days	6 years 10 months 24 days	6 years 9 months 18 days
Stock options Vested and Exercisable, Weighted Average Remaining Contractual Term in Years	5 years 4 months 24 days
Stock options Vested and Exercisable, Aggregate Intrinsic Value	$ 16
Director Stock Plan [Member]
Summary of transactions involving stock options awarded under the Directors Stock Plan
Number of Shares Outstanding, Beginning Balance	79,000	100,000	121,000
Number of Shares, Expired	(37,000)	(21,000)	(21,000)
Number of Shares Outstanding, Ending Balance	42,000	79,000	100,000	121,000
Stock options Vested and Exercisable	42,000
Weighted Average Exercise Price, Beginning Balance	$ 9.27	$ 10.24	$ 15.59
Weighted Average Exercise price, Expired	$ 13.06	$ 13.88	$ 41.06
Weighted Average Exercise Price, Ending Balance	$ 5.93	$ 9.27	$ 10.24	$ 15.59
Stock options Vested and Exercisable, Weighted Average Exercise Price	$ 5.93
Weighted Average Remaining Contractual Term in Years	1 year 10 months 24 days	1 year 8 months 12 days	2 years 2 months 12 days	2 years 8 months 12 days
Stock options Vested and Exercisable, Weighted Average Remaining Contractual Term in Years	1 year 10 months 24 days
Stock options Vested and Exercisable, Aggregate Intrinsic Value	$ 0