Loss Per Common Share (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Numerator:
Loss applicable to common stockholders	$ (28,577)	$ (8,853)	$ (29,983)	$ (25,650)	$ (114,132)	$ (44,438)	$ (41,707)	$ (30,974)	$ (93,063)	$ (231,251)	$ (147,534)
Denominator:
Denominator for basic loss per common share (in shares)									19,043,000	18,211,000	17,441,000
Effect of dilutive securities:
Stock options (in shares)									0	0	0
Warrants (in shares)									0	0	0
Restricted stock (in shares)									0	0	0
Convertible preferred stock (in shares)									0	0	0
Denominator for diluted loss per common share (in shares)									19,043,000	18,211,000	17,441,000
Loss per common share:
Basic and diluted (usd per share)	$ (1.50)	$ (0.46)	$ (1.58)	$ (1.35)	$ (6.03)	$ (2.44)	$ (2.34)	$ (1.74)	$ (4.89)	$ (12.70)	$ (8.46)
Options
Anti-dilutive securities
Number of securities excluded from the calculation of diluted loss per share because of anti-dilutive effect									807,164	324,653	427,804
Warrants
Anti-dilutive securities
Number of securities excluded from the calculation of diluted loss per share because of anti-dilutive effect									0	2,129,400	0
Common stock that can be purchased on exercise of warrants issued in consideration for obligations under debt instrument (in shares)	3,735,000				3,735,000				3,735,000	3,735,000	3,735,000
Restricted stock
Anti-dilutive securities
Number of securities excluded from the calculation of diluted loss per share because of anti-dilutive effect									518,970	299,199	313,831
Convertible preferred stock
Anti-dilutive securities
Number of securities excluded from the calculation of diluted loss per share because of anti-dilutive effect									6,065,439	5,508,527	4,865,457