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, 2014	Dec. 31, 2013	Dec. 31, 2012
Stock Options
Options Outstanding, Number of Shares [Roll Forward]
Number of shares, beginning balance	6,625	4,534	6,365
Number of shares, Options granted at common stock price	2,036	3,578	1,422
Number of shares, Options exercised	(44)	(24)	(466)
Number of shares, Options cancelled	(1,893)	(1,463)	(2,787)
Number of shares, ending balance	6,724	6,625	4,534
Number of shares, Exercisable	2,601
Number of shares, Vested and expected to vest	5,982
Options Outstanding, Weighted Average Exercise Price [Roll Forward]
Weighted average exercise price, beginning balance (in dollars per share)	$ 10.21	$ 14.07	$ 14.24
Weighted average exercise price, Options granted at common stock price (in dollars per share)	$ 7.44	$ 7.56	$ 8.29
Weighted average exercise price, Options exercised (in dollars per share)	$ 7.26	$ 5.56	$ 6.61
Weighted average exercise price, Options canceled (in dollars per share)	$ 14.47	$ 15.76	$ 12.76
Weighted average exercise price, ending balance (in dollars per share)	$ 8.19	$ 10.21	$ 14.07
Weighted average exercise price, exercisable (in dollars per share)	$ 9.19
Weighted average exercise price, vested and expected to vest (in dollars per share)	$ 8.26
Weighted Average Fair Value Grant
Weighted average fair value grant, Options granted at common stock prrice (in dollars per share)	$ 2.51	$ 2.93	$ 3.71
Options, Additional Information
Weighted average remaining contractual life, outstanding	5 years 2 months 18 days
Weighted average remaining contractual life, exercisable	3 years 10 months 12 days
Weighted average remaining contractual life, vested and expected to vest	5 years 1 month 1 day
Intrinsic value, options outstanding	$ 0.2
Intrinsic value, options exercisable	0.1
Intrinsic value, options vested and expected to vest	0.2
Intrinsic value, options exercised		$ 0.1	$ 1.0