Debt Obligations (Schedule Of Debt) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014	Oct. 10, 2014	Jul. 31, 2011	Jul. 31, 2008	Mar. 31, 2014
Debt Instrument [Line Items]
Total Liabilities Subject to Compromise	$ 790,246	$ 790,246
Liabilities Not Subject to Compromise	605,213	652,192
Total Debt Obligations	1,230,246	1,230,246
Less: Debt Discount	(6,859)	(7,819)
Less: Liabilities Subject to Compromise	(790,246)	(790,246)
Less: current maturities	(433,141)	(432,181)
Senior Notes,12% Fixed Rate, Due 2018 [Member]
Debt Instrument [Line Items]
Total Liabilities Subject to Compromise	554,000	554,000
Less: Liabilities Subject to Compromise	(554,000)	(554,000)
Interest rate	12.00%	12.00%
Convertible Senior Notes, 5.5% Fixed Rate, Due 2016 [Member]
Debt Instrument [Line Items]
Total Liabilities Subject to Compromise	135,000	135,000
Less: Liabilities Subject to Compromise	(135,000)	(135,000)
Interest rate	5.50%	5.50%	5.50%	5.50%
Convertible bonds, 11.5% until March 31, 2014 and 7.5% thereafter, due 2016 [Member]
Debt Instrument [Line Items]
Total Liabilities Subject to Compromise	83,746	83,746
Less: Liabilities Subject to Compromise	(83,746)	(83,746)
Interest rate	11.50%	11.50%
7.5% Fixed Rate [Member]
Debt Instrument [Line Items]
Interest rate	7.50%	7.50%	7.50%		7.50%
Convertible Senior Notes, 6.5% Fixed Rate, Due 2017 [Member]
Debt Instrument [Line Items]
Total Liabilities Subject to Compromise	17,500	17,500
Less: Liabilities Subject to Compromise	(17,500)	(17,500)
Interest rate	6.50%	6.50%				6.50%
Amended Term Loan Facility, Due 2017 [Member]
Debt Instrument [Line Items]
Liabilities Not Subject to Compromise	$ 440,000	$ 440,000