Fair Value Measurements (Schedule Of Assets Or Liabilities Measured On Recurring Basis) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair value, beginning of period	$ 20,337	$ 5,907
Net unrealized (gains) losses, included in other income (loss)	(4,823)	(2,115)
Purchases and issuances	0	151
Sales and settlements, included in derivative gain (loss)	0	0
Gross transfers in	0	0
Gross transfers out	0	0
Fair value, end of period	15,514	3,943
Changes in realized (gains) losses included in income on instruments held at end of period	0	0
Changes in unrealized (gains) losses included in income on instruments held at end of period	(4,823)	(2,115)
Series C Preferred Embedded Derivative [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair value, beginning of period	13,804	3,761
Net unrealized (gains) losses, included in other income (loss)	(2,883)	(1,210)
Purchases and issuances	0	0
Sales and settlements, included in derivative gain (loss)	0	0
Gross transfers in	0	0
Gross transfers out	0	0
Fair value, end of period	10,921	2,551
Changes in realized (gains) losses included in income on instruments held at end of period	0	0
Changes in unrealized (gains) losses included in income on instruments held at end of period	(2,883)	(1,210)
Warrant derivative [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair value, beginning of period	6,533	2,146
Net unrealized (gains) losses, included in other income (loss)	(1,940)	(905)
Purchases and issuances	0	0
Sales and settlements, included in derivative gain (loss)	0	0
Gross transfers in	0	0
Gross transfers out	0	0
Fair value, end of period	4,593	1,241
Changes in realized (gains) losses included in income on instruments held at end of period	0	0
Changes in unrealized (gains) losses included in income on instruments held at end of period	(1,940)	(905)
Conversion Loan Embedded Derivative [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair value, beginning of period	0	0
Net unrealized (gains) losses, included in other income (loss)	0	0
Purchases and issuances	0	151
Sales and settlements, included in derivative gain (loss)	0	0
Gross transfers in	0	0
Gross transfers out	0	0
Fair value, end of period	0	151
Changes in realized (gains) losses included in income on instruments held at end of period	0	0
Changes in unrealized (gains) losses included in income on instruments held at end of period	$ 0	$ 0