Debt Obligations (Schedule Of Debt) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Debt Instrument [Line Items]
Long-term debt, gross	$ 912,192	$ 882,600
Less: debt discount, net of premium	(18,223)	(11,722)
Less: current maturities	(2,140)
Long-term debt	891,829	870,878
Senior Notes,12% Fixed Rate, Due 2018 [Member]
Debt Instrument [Line Items]
Long-term debt, gross	554,000	554,000
Interest rate	12.00%	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%	5.50%
Convertible Senior Notes, 6.5% Fixed Rate, Due 2017 [Member]
Debt Instrument [Line Items]
Long-term debt, gross	17,500
Interest rate	6.50%
Term Loan Facility, Variable Rate, Due 2017 [Member]
Debt Instrument [Line Items]
Long-term debt, gross	125,000
Revolving Credit Facility, 13% Fixed Rate, Due 2014 [Member]
Debt Instrument [Line Items]
Long-term debt, gross		115,163
Interest rate	13.00%	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	$ 80,692	$ 78,437
Interest rate	11.50%	11.50%
7.5% Fixed Rate [Member]
Debt Instrument [Line Items]
Interest rate	7.50%	7.50%