Share-based Compensation (Option Price Ranges) (Details) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Stock options outstanding	1,998,633
Stock options outstanding, Weighted Average Remaining Contractual Term (in years)	1 year 2 months 1 day	1 year 6 months 21 days	2 years 6 months 3 days	2 years 10 months 27 days
Stock options outstanding, Weighted Average Exercise Price (in dollars per share)	$ 4.03	$ 2.51	$ 2.22	$ 1.69
Stock options exercisable	1,863,633
Stock options exercisable, Weighted Average Exercise Price (in dollars per share)	$ 2.96
$0.59-$1.75 Exercise Price Range [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Shares authorized under stock option plans, exercise price range, lower range limit	$ 0.59
Shares authorized under stock option plans, exercise price range, upper range limit	$ 1.75
Stock options outstanding, by exercise price range	1,470,375
Stock options outstanding, Weighted Average Remaining Contractual Term (in years)	10 months 24 days
Stock options outstanding, Weighted Average Exercise Price, by exercise price range (in dollars per share)	$ 0.97
Stock options exercisable, by exercise price range	1,470,375
Stock options exercisable, Weighted Average Exercise Price, by exercise price range (in dollars per share)	$ 0.97
$2.17-$2.36 Exercise Price Range [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Shares authorized under stock option plans, exercise price range, lower range limit	$ 2.17
Shares authorized under stock option plans, exercise price range, upper range limit	$ 2.36
Stock options outstanding, by exercise price range	54,000
Stock options outstanding, Weighted Average Remaining Contractual Term (in years)	3 years 4 months 20 days
Stock options outstanding, Weighted Average Exercise Price, by exercise price range (in dollars per share)	$ 2.27
Stock options exercisable, by exercise price range	54,000
Stock options exercisable, Weighted Average Exercise Price, by exercise price range (in dollars per share)	$ 2.27
$6.98-$7.27 Exercise Price Range [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Shares authorized under stock option plans, exercise price range, lower range limit	$ 6.98
Shares authorized under stock option plans, exercise price range, upper range limit	$ 7.27
Stock options outstanding, by exercise price range	204,258
Stock options outstanding, Weighted Average Remaining Contractual Term (in years)	7 months 17 days
Stock options outstanding, Weighted Average Exercise Price, by exercise price range (in dollars per share)	$ 7.16
Stock options exercisable, by exercise price range	204,258
Stock options exercisable, Weighted Average Exercise Price, by exercise price range (in dollars per share)	$ 7.16
$16.94-$21.70 Exercise Price Range [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Shares authorized under stock option plans, exercise price range, lower range limit	$ 16.94
Shares authorized under stock option plans, exercise price range, upper range limit	$ 21.70
Stock options outstanding, by exercise price range	270,000
Stock options outstanding, Weighted Average Remaining Contractual Term (in years)	2 years 7 months 6 days
Stock options outstanding, Weighted Average Exercise Price, by exercise price range (in dollars per share)	$ 18.66
Stock options exercisable, by exercise price range	135,000
Stock options exercisable, Weighted Average Exercise Price, by exercise price range (in dollars per share)	$ 18.52