Fair Value Measurements and Derivative Instruments (Reconciliation of Items Measured at Fair Value on a Recurring Basis) (Details) - Level 3 [Member] - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair value, beginning of period	$ (1,032)	$ (674)	$ (1,058)	$ (711)
Net gains (losses) recognized in earnings	7	(97)	33	(60)
Fair value, end of period	(1,025)	(771)	(1,025)	(771)
Total unrealized gains (losses) during the period included in earnings related to instruments held at end of period	7	(97)	33	(60)
Series E Preferred Embedded Redemption Option [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair value, beginning of period		398	22	289
Net gains (losses) recognized in earnings		30	(22)	139
Fair value, end of period		428		428
Total unrealized gains (losses) during the period included in earnings related to instruments held at end of period		30	(22)	139
Convertible Debt [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair value, beginning of period	(1,032)	(1,072)	(1,080)	(1,000)
Net gains (losses) recognized in earnings	7	(127)	55	(199)
Fair value, end of period	(1,025)	(1,199)	(1,025)	(1,199)
Total unrealized gains (losses) during the period included in earnings related to instruments held at end of period	$ 7	$ (127)	$ 55	$ (199)