Employee Share-Based Compensation Plans (Details 2) (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Summary of stock option activity under the Equity Plans
Share-based awards outstanding, Beginning	3,700,000	2,773,165
Shares under options, Granted	938,757	1,136,540
Stock option exercises	(99,541)
Shares under options, Forfeited or expired	(460,252)	(179,132)
Share-based awards outstanding, Ending	4,100,000	3,700,000
Shares under options, Vested and expected to vest	3,731,026
Shares under options, Exercisable, number	2,427,264
Weighted Average Exercise Price, Beginning Balance	$ 3.88	$ 4.25
Weighted Average Exercise Price, Granted	$ 3.85	$ 3.11
Weighted Average Exercise Price, Exercised	$ 2.69
Weighted Average Exercise Price, forfeited or expired	$ 4.35	$ 4.68
Weighted Average Exercise Price, Ending Balance	$ 3.85	$ 3.88
Weighted Average Exercise Price, Vested or Expired	$ 3.88
Weighted Average Exercise Price, Exercisable	$ 4.01
Outstanding, Weighted Average Remaining Contractual Term	4 years 5 months 1 day	4 years 4 months 6 days
Vested and Expected to vest, Weighted Average Remaining Contractual Term	4 years 29 days
Exercisable, Weighted Average Remaining Contractual Term	3 years 4 months 21 days
Outstanding, Intrinsic Value	$ 2,019	$ 29
Vested or expired, Intrinsic Value	1,886
Exercisable, Intrinsic Value	$ 1,426