Fair Value Measurements And Derivative Instruments (Reconciliation Of Fair Value Liabilities Measured On Recurring Basis) (Details) - Level 3 [Member] - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair value, beginning of period	$ (1,315)	$ (8,682)
Net gains (losses) recognized in earnings	183	6,261
Purchases and issuances	150	(1,012)
Sales and settlements		1,423
Gross transfers into Level 3
Gross transfers out of Level 3		611
Fair value, end of period	(982)	(1,399)
Total unrealized gains (losses) during the period included in earnings related to instruments held at end of period	183	(387)
Series E Preferred Embedded Redemption Option [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair value, beginning of period
Net gains (losses) recognized in earnings	(57)
Purchases and issuances	150
Sales and settlements
Gross transfers into Level 3
Gross transfers out of Level 3
Fair value, end of period	93
Total unrealized gains (losses) during the period included in earnings related to instruments held at end of period	(57)
Series C Preferred Embedded Derivative [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair value, beginning of period		(6,271)
Net gains (losses) recognized in earnings		4,848
Purchases and issuances
Sales and settlements		1,423
Gross transfers into Level 3
Gross transfers out of Level 3
Fair value, end of period
Total unrealized gains (losses) during the period included in earnings related to instruments held at end of period
Warrant Derivative [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair value, beginning of period		(2,411)
Net gains (losses) recognized in earnings		1,800
Purchases and issuances
Sales and settlements
Gross transfers into Level 3
Gross transfers out of Level 3
Fair value, end of period
Total unrealized gains (losses) during the period included in earnings related to instruments held at end of period
Convertible Debt [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair value, beginning of period
Net gains (losses) recognized in earnings		(387)
Purchases and issuances		(1,012)
Sales and settlements
Gross transfers into Level 3
Gross transfers out of Level 3
Fair value, end of period		(1,399)
Total unrealized gains (losses) during the period included in earnings related to instruments held at end of period		$ (387)
Convertible Debt [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair value, beginning of period	(1,315)
Net gains (losses) recognized in earnings	240
Purchases and issuances
Sales and settlements
Gross transfers into Level 3
Gross transfers out of Level 3
Fair value, end of period	(1,075)
Total unrealized gains (losses) during the period included in earnings related to instruments held at end of period	$ 240