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		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair value, beginning of period	$ (982)		$ (1,315)	$ (8,682)
Net gains (losses) recognized in earnings	265		448	6,469
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	(717)	$ (1,191)	(717)	(1,191)
Total unrealized gains (losses) during the period included in earnings related to instruments held at end of period	265		448	(179)
Series E Preferred Embedded Redemption Option [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair value, beginning of period	93
Net gains (losses) recognized in earnings	240		183
Purchases and issuances			150
Sales and settlements
Gross transfers into Level 3
Gross transfers out of Level 3
Fair value, end of period	333		333
Total unrealized gains (losses) during the period included in earnings related to instruments held at end of period	240		183
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
Sales and settlements				1,423
Convertible Debt [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair value, beginning of period		(1,399)
Net gains (losses) recognized in earnings		208
Purchases and issuances
Sales and settlements
Gross transfers into Level 3
Gross transfers out of Level 3
Fair value, end of period		(1,191)		(1,191)
Total unrealized gains (losses) during the period included in earnings related to instruments held at end of period		208
Convertible Debt [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair value, beginning of period	(1,075)		(1,315)
Net gains (losses) recognized in earnings	25		265	(179)
Purchases and issuances				(1,012)
Sales and settlements
Gross transfers into Level 3
Gross transfers out of Level 3
Fair value, end of period	(1,050)	$ (1,191)	(1,050)	(1,191)
Total unrealized gains (losses) during the period included in earnings related to instruments held at end of period	$ 25		$ 265	(179)
Real Estate Strategies, L.P. [Member] | 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
Gross transfers out of Level 3				$ 611