Subsequent Events (Details) (USD $) Share data in Millions, except Per Share data, unless otherwise specified	3 Months Ended	0 Months Ended	3 Months Ended
	Mar. 31, 2011	May 09, 2012 Senior Secured Discount Notes Due 2019 [Member]	Mar. 31, 2012 First Three Years [Member] Senior Secured Discount Notes Due 2019 [Member]	Mar. 31, 2012 Thereafter [Member] Senior Secured Discount Notes Due 2019 [Member]
Debt Instrument [Line Items]
Amount of convertible notes exchanged for "New Notes"		$ 108,000,000
Common stock purchasable with warrants from exchange of convertible notes, shares		4.0
Initial exercise price of warrants to purchase common stock, per share		$ 1.863
Net proceeds from additional units purchased	$ 222,697,000	$ 44,000,000
New Notes annual cash coupon rate			3.00%	12.00%