Equity Incentive Awards and Warrants (Details 2) (USD $) Share data in Thousands, except Per Share data, unless otherwise specified	12 Months Ended
Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value	$ 1.37	$ 1.36	$ 1.40
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Total Intrinsic Value	$ 462,000	$ 63,000	$ 1,100
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term	6 years
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term	5 years 1 month
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value	2,500,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Intrinsic Value	$ 1,900,000
Employee Stock Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value	$ 1.37
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number	21,525	20,476	19,598	17,346
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price	$ 2.51	$ 2.84	$ 3.46	$ 4.16
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross	3,441	2,974	4,928
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price	$ 1.84	$ 1.80	$ 1.87
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period	(636)	(130)	(11)
Share-based Compensation Arrangements by Share-based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price	$ 1.66	$ 1.46	$ 2.15
Share-based Compensation Arrangement by Share-based Payment Award, Options, Expirations in Period	(1,231)	(1,662)	(1,912)
Share-based Compensation Arrangements by Share-based Payment Award, Options, Expirations in Period, Weighted Average Exercise Price	$ 6.93	$ 8.50	$ 6.40
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures in Period	(525)	(304)	(753)
Share-based Compensation Arrangements by Share-based Payment Award, Options, Forfeitures in Period, Weighted Average Exercise Price	$ 1.78	$ 1.76	$ 1.76
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number	15,582	13,940	11,845
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Exercise Price	$ 2.77	$ 3.34	$ 4.54

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