Debt Textual (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2012 Convertible Notes due December 15, 2017 [Member]	Dec. 20, 2011 Convertible Notes due December 15, 2017 [Member]	Dec. 15, 2011 Convertible Notes due December 15, 2017 [Member]	Dec. 31, 2012 Senior Secured Notes Due in 2016 [Member]	Dec. 31, 2011 Senior Secured Notes Due in 2016 [Member]	Dec. 31, 2012 Senior Convertible Notes Due in 2017 [Member]	Dec. 31, 2011 Senior Convertible Notes Due in 2017 [Member]	Dec. 31, 2011 New Revolving Credit Facility [Member]	Dec. 31, 2012 Domestic Subsidiaries [Member]
Debt Instrument [Line Items]
Consolidated Domestic Subsidiaries, Ownership Percentage												100.00%
Aggregate principal amount issued	$ 225,000	$ 225,000						$ 225,000
Stated interest rate on debt				7.00%			12.75%		7.00%
Line of Credit Facility, Maximum Borrowing Capacity											100,000
Aggregate principal amount of Convertible Notes issued	57,500	57,500			7,500	50,000				57,500
Origination fee		18,136
Underwriting fees associated with debt financing		3,375
Loss on extinguishment of debt	$ 0	$ (6,153)	$ 0