Voluntary Reorganization Under Chapter 11 (Narrative) (Details) (USD $) In Millions, unless otherwise specified	0 Months Ended
	Sep. 02, 2014	Oct. 31, 2012	Feb. 29, 2012	Mar. 31, 2015	Dec. 31, 2014	Oct. 10, 2014	Jul. 31, 2008	Jul. 31, 2011
Debt Instrument [Line Items]
Interest due	$ 33.5
First Priority Notes [Member]
Debt Instrument [Line Items]
Interest rate	12.00%	12.00%	12.00%
Second Priority Notes [Member]
Debt Instrument [Line Items]
Interest rate	12.00%		12.00%
6.5% Convertible Notes [Member]
Debt Instrument [Line Items]
Interest rate	6.50%
7.5% Fixed Rate [Member]
Debt Instrument [Line Items]
Interest rate				7.50%	7.50%	7.50%	7.50%
Convertible Senior Notes, 5.5% Fixed Rate, Due 2016 [Member]
Debt Instrument [Line Items]
Interest rate				5.50%	5.50%	5.50%		5.50%