Share-based Compensation - Stock Options (Details) (USD $)	12 Months Ended							12 Months Ended	3 Months Ended
	Dec. 31, 2012		Dec. 31, 2011		Dec. 31, 2010		Sep. 23, 2011	Dec. 31, 2012 Stock Options [Member]	Dec. 31, 2012 Surrender Agreements [Member] Executive Officer [Member]	Oct. 11, 2012 Surrender Agreements [Member] Executive Officer [Member] Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options weighted average grant date fair value (in usd per share)	$ 4.95		$ 6.22
Expected volatility	70.80%		65.12%
Expected term (in years)	5 years 9 months		5 years 9 months 7 days
Risk-free interest rate	0.90%		1.035%
Expected dividend yield	0.00%		0.00%
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Options outstanding, number of shares - beginning balance	3,146,000	[1]	4,631,000	[1]
Options exercisable, number of shares - beginning balance	1,466,000	[1]	2,308,000	[1]
Options granted, number of shares	1,453,000	[1]	1,138,000	[1]
Options forfeited, number of shares	(1,234,000)	[1]	(2,620,000)	[1]
Options exercised, number of shares	0	[1]	(2,000)	[1]
Options outstanding, number of shares - ending balance	3,365,000	[1]	3,146,000	[1]	4,631,000	[1]
Options exercisable, number of shares - ending balance	1,222,000	[1]	1,466,000	[1]	2,308,000	[1]
Options outstanding, weighted average remaining term	6 years 9 months 26 days		6 years 10 months 21 days		5 years 11 months 9 days
Options outstanding, aggregate instrinsic value	$ 433,000		$ 1,012,000		$ 137,000
Options exercisable, weighted average remaining contractual term	4 years 2 months 23 days		4 years 9 months 15 days		5 years 0 months 26 days
Options exercisable, aggregate intrinsic value	0		0		0
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Roll Forward]
Options outstanding, weighted average exercise price per share - beginning balance (in usd per share)										$ 50
Options exercisable, weighted average exercise price per share - beginning balance (in usd per share)	$ 34.71		$ 38.98
Options granted, weighted average exercise price per share (in usd per share)	$ 8.22		$ 10.47
Options forfeited, weighted average exercise price per share (in usd per share)	$ 36.59		$ 45.37
Options exercised, weighted average exercise price per share (in usd per share)	$ 0.00				$ 14.89
Options outstanding, weighted average exercise price per share - ending balance (in usd per share)	$ 14.38		$ 25.93		$ 40.73
Options exercisable, weighted average exercise price per share - ending balance (in usd per share)	$ 23.30		$ 34.71		$ 38.98
Unrecognized compensation costs related to unvested awards								10,400,000
Unrecognized compensation costs weighted average period for recognition								2 years 11 months 9 days
Share based compensation, options, exercisable period, maximum	10 years
Shares surrendered									415,000
Exercise price of shares surrendered, lower range									$ 51.50
Exercise price of shares surrendered, upper range									$ 79
Proceeds from stock options exercised	$ 0		$ 32,730
Number of common stock shares exchanged							1,600,000
Percentage of shares exchanged							93.00%
Shares received from exchange							256,202
Exercise price of shares received from exchange (in usd per share)							$ 7.09
Fair value of exchanged options as a percentage							50.00%

[1] The stock options granted and forfeited activity for the year ended December 31, 2011 included the impact of our stock option exchange program as discussed below. The stock options forfeited activity for the year ended December 31, 2012 included options surrendered pursuant to the Surrender Agreements discussed below.