Stock, Stock Options and Rights Schedule of Stock Option Exercise Prise Range (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified				12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2012 $ 1.69 – $ 4.00	Dec. 31, 2012 $ 4.01 – $ 5.50	Dec. 31, 2012 $ 5.51 – $ 6.75	Dec. 31, 2012 $ 6.76 – $10.00	Dec. 31, 2012 $10.01 – $13.99	Dec. 31, 2012 $ 1.69 – $13.99
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Lower Range Limit				$ 1.69	$ 3.51	$ 5.51	$ 7.01	$ 10.01	$ 1.69
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Upper Range Limit				$ 3.50	$ 3.51	$ 7.00	$ 10.00	$ 13.99	$ 13.99
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Number of Outstanding Options				4,863	6,333	10,534	6,645	4,866	33,241
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Exercisable Options, Weighted Average Remaining Contractual Term				4 years 11 months 14 days	4 years 7 months 25 days	7 years 8 months 22 days	6 years 11 months 15 days	8 years 2 months 13 days	6 years 7 months 25 days
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Outstanding Options, Weighted Average Exercise Price, Beginning Balance				$ 2.60	$ 5.04	$ 6.14	$ 7.18	$ 12.54	$ 6.56
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Number of Exercisable Options	19,156	15,963	14,208	4,716	5,419	4,266	3,895	860	19,156
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Exercisable Options, Weighted Average Exercise Price	$ 5.51	$ 5.34	$ 6.35	$ 2.61	$ 5.04	$ 6.39	$ 7.18	$ 12.54	$ 5.51