Debt Obligations (Schedule Of Debt) (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Debt Instrument [Line Items]
Long-term debt, gross	$ 878,277	$ 874,192
Less: debt discount, net of premium	(13,220)	(14,686)
Less: current maturities	(115,163)	(15,713)
Long-term debt	749,894	843,793
Senior Notes, 12% Fixed Rate, Due 2018 [Member]
Debt Instrument [Line Items]
Long-term debt, gross	554,000	554,000
Less: debt discount, net of premium	(20,000)
Interest rate	12.00%
Convertible Senior Notes, 5.5% Fixed Rate, Due 2016 [Member]
Debt Instrument [Line Items]
Long-term debt, gross	135,000	135,000
Interest rate	5.50%
Revolving Credit Facility, 13% Fixed Rate, Due 2014 [Member]
Debt Instrument [Line Items]
Long-term debt, gross	115,163	115,163
Interest rate	13.00%
Convertible Bonds, 11.5% Until March 31, 2014 and 7.5% thereafter, due 2016 [Member]
Debt Instrument [Line Items]
Long-term debt, gross	$ 74,114	$ 70,029
Interest rate	11.50%
7.5% Fixed Rate [Member]
Debt Instrument [Line Items]
Interest rate	7.50%