Employee Stock and Benefit Plans (Stock Option Activity) (Details) (Stock Options, USD $) In Millions, except Share data in Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Stock Options
Options Outstanding, Number of Shares [Roll Forward]
Number of shares, beginning balance	4,534	6,365	5,559
Number of shares, Options granted at common stock price	3,578	1,422	2,250
Number of shares, Options exercised	(24)	(466)	(210)
Number of shares, Options cancelled	(1,463)	(2,787)	(1,234)
Number of shares, ending balance	6,625	4,534	6,365
Number of shares, Exercisable	2,293
Number of shares, Vested and expected to vest	5,353
Options Outstanding, Weighted Average Exercise Price [Roll Forward]
Weighted average exercise price, beginning balance	$ 14.07	$ 14.24	$ 19.68
Weighted average exercise price, Options granted at common stock price	$ 7.56	$ 8.29	$ 9.54
Weighted average exercise price, Options exercised	$ 5.56	$ 6.61	$ 10.57
Weighted average exercise price, Options cancelled	$ 15.76	$ 12.76	$ 14.72
Weighted average exercise price, ending balance	$ 10.21	$ 14.07	$ 14.24
Weighted average exercise price, exercisbale	$ 14.82
Weighted average exercise price, vested and expected to vest	$ 10.81
Weighted Average Fair Value Grant
Weighted average fair value grant, Options granted at common stock prrice	$ 2.93	$ 3.71	$ 5.08
Options, Additional Information
Weighted average remaining contractual life, outstanding	5 years 4 months 18 days
Weighted average remaining contractual life, exercisable	3 years 4 months 12 days
Weighted average remaining contractual life, vested and expected to vest	5 years 1 month 24 days
Intrinsic value, options outstanding	$ 0.7
Intrinsic value, options exercisable	0.2
Intrinsic value, options vested and expected to vest	0.6
Intrinsic value, options exercised	$ 0.1	$ 1.0	$ 0.3