Long-Term Debt (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Debt Instrument [Line Items]
12% Senior notes due 2018, net of discount	$ 300,976	$ 299,157
Total credit facilities	291,000	233,000
Long-term debt	591,976	532,157	[1]
3.25% Convertible Senior Notes due 2016 [Member]
Debt Instrument [Line Items]
Principal amount	115,000	115,000
Unamortized discount	(15,406)	(17,079)
3.25% Convertible senior notes due 2016, net of discount	99,594	97,921
12% Senior Notes due 2018 [Member]
Debt Instrument [Line Items]
Principal amount	203,000	203,000
Unamortized discount	(1,618)	(1,764)
12% Senior notes due 2018, net of discount	201,382	201,236
Corporate Bank Credit Facility [Member]
Debt Instrument [Line Items]
Corporate Credit Facility	265,000	209,000
PDCM Credit Facility [Member]
Debt Instrument [Line Items]
PDCM Credit Facility	$ 26,000	$ 24,000

[1] Derived from audited 2011 balance sheet.