Stock-Based Compensation - Stock Option Activity (Details) (USD $) In Millions, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Stock Options [Roll Forward]
Outstanding. Beginning Balance (in shares)	5,679,579	4,916,088	4,594,838
Granted (in shares)	1,178,780	1,401,163	889,089
Exercised (in shares)	0	(45,429)	(1,000)
Canceled (in shares)	(752,415)	(475,703)	(421,146)
Forfeited (in shares)	(287,472)	(116,540)	(145,693)
Outstanding, Ending Balance (in shares)	5,818,472	5,679,579	4,916,088	4,594,838
Weighted Average Exercise Price [Roll Forward]
Oustanding, Beginning Balance (dollars per share)	$ 19.87	$ 24.10	$ 27.19
Granted (dollars per share)	$ 5.80	$ 9.41	$ 10.46
Exercised (dollars per share)	$ 0.00	$ 10.13	$ 8.11
Canceled (dollars per share)	$ 26.61	$ 35.11	$ 31.19
Forfeited (dollars per share)	$ 9.24	$ 14.34	$ 17.97
Outstanding, Ending Balance (dollars per share)	$ 16.57	$ 19.87	$ 24.10	$ 27.19
Weighted Average Remaining Contractual Life (Years)	5 years 11 months	6 years	5 years 7 months 6 days	6 years 2 months 12 days
Aggregate Intrinsic Value	$ 0	$ 0	$ 0.7	$ 0.1